Subject: Re: [Healeys] Radiator cap with expansion tank.

From: Jim Ryan <[email-masked]>
Date: Sat, 11 Oct 2025 13:03:11 -0400

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Hey Simon,

No, the radiator cap stays on the radiator. Increased pressure in the
radiator raises the boiling point. If the radiator gets hot enough for the
pressure to release the cab then the overflow will go into the wall bottle.
Once it cools down it's supposed to get pulled back into the radiator. Of
course, this is a British car so theory and reality May differ. But you
definitely want to leave a lady in the cop on the radiator.

Jim Ryan

=C2=A9=C2=BF=C2=A9=C2=AC

On Sat, Oct 11, 2025, 11:45=E2=80=AFAM Simon Lachlan via Healeys <
[email-masked]> wrote:

> Forgive another stupid question but it=E2=80=99s sensible to be sure=E2=
=80=A6=E2=80=A6=E2=80=A6.
>
> Am I right in assuming(!) that, if one fits an expansion tank, the
> standard cap is moved from the radiator to the expansion tank and is
> replaced by a blanking(?) cap ie one which has no spring, no means of
> relief etcetc? Seem logical to me but logic has let me down before.
>
> Simon
> _______________________________________________
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<div dir=3D"auto"><div>Hey Simon,</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">No, the radiator cap stays on the radiator. Increased pressure in=
 the radiator raises the boiling point. If the radiator gets hot enough for=
 the pressure to release the cab then the overflow will go into the wall bo=
ttle. Once it cools down it&#39;s supposed to get pulled back into the radi=
ator. Of course, this is a British car so theory and reality May differ. Bu=
t you definitely want to leave a lady in the cop on the radiator.</div><div=
 dir=3D"auto"><br></div><div dir=3D"auto"><br></div><div><br></div><div dat=
a-smartmail=3D"gmail_signature"><div dir=3D"ltr"><p style=3D"font-size:12.8=
000001907349px"><span style=3D"font-size:10pt;color:navy">Jim Ryan<u></u><u=
></u></span></p><p style=3D"font-size:12.8000001907349px">=C2=A9=C2=BF=C2=
=A9=C2=AC</p></div></div></div><br><div class=3D"gmail_quote gmail_quote_co=
ntainer"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, Oct 11, 2025, 11:45=
=E2=80=AFAM Simon Lachlan via Healeys &lt;<a href=3D"mailto:[email-masked]=
eam.net">[email-masked]</a>&gt; wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex"><u></u>

<div>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Aptos">Forgive another st=
</font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span=
 lang=3D"en-gb"><font face=3D"Aptos">upid question but it=E2=80=99s sensibl=
e to be sure=E2=80=A6=E2=80=A6=E2=80=A6.</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Aptos">Am I right in assu=
ming(!) that, if one fits an expan</font></span><span lang=3D"en-gb"></span=
><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Aptos">sion=
 tank, the standard cap is moved from the radiator to the expansion tank an=
d is replaced by a blank</font></span><span lang=3D"en-gb"></span><span lan=
g=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Aptos">ing(?) cap ie =
one which has no spring, no means of relief etcetc</font></span><span lang=
=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font fa=
ce=3D"Aptos">? Seem logical to me but logic</font></span><span lang=3D"en-g=
b"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Ap=
tos"> has let me down before</font></span><span lang=3D"en-gb"></span><span=
 lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Aptos">.</font></=
span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Aptos">Simon</font></span=
><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-g=
b"></span></p>

</div>
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From: sbyers--- via Healeys <[email-masked]>
Date: Sat, 11 Oct 2025 13:33:03 -0400

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Simon, I have an expansion tank in my BJ8 using the original metal tank from
an MG Midget.  I also have the stock 7 psi cap on both the radiator and the
overflow tank and a clear "overflow" hose on the radiator neck to the tank.
The tank captures any overflow from the radiator and I can see the system
operate with the clear tubing.  When hot, the flow is out to the tank and
back into the radiator as it cools.  Excess coolant in the overflow tank can
flow out to the ground through the tank overflow connection.
 
Steve Byers
BJ8 Registry
AHCA Delegate at Large
 
From: Healeys <[email-masked]> On Behalf Of Simon Lachlan
via Healeys
Sent: Saturday, October 11, 2025 11:32 AM
To: 'Healeys' <[email-masked]>
Subject: [Healeys] Radiator cap with expansion tank.
 
Forgive another stupid question but it's sensible to be sure....
Am I right in assuming(!) that, if one fits an expansion tank, the standard
cap is moved from the radiator to the expansion tank and is replaced by a
blanking(?) cap ie one which has no spring, no means of relief etcetc? Seem
logical to me but logic has let me down before.
Simon

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UnhideWhenUsed=3D"true" Name=3D"Normal (Web)"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"HTML Acronym"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"HTML Address"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"HTML Cite"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"HTML Code"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"HTML Definition"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"HTML Keyboard"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"HTML Preformatted"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"HTML Sample"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"HTML Typewriter"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"HTML Variable"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Normal Table"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"annotation subject"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"No List"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Outline List 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Outline List 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Outline List 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Simple 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Simple 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Simple 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Classic 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Classic 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Classic 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Classic 4"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Colorful 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Colorful 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Colorful 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Columns 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Columns 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Columns 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Columns 4"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Columns 5"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 4"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 5"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 6"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 7"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 8"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 4"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 5"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 6"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 7"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 8"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table 3D effects 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table 3D effects 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table 3D effects 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Contemporary"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Elegant"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Professional"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Subtle 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Subtle 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Web 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Web 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Web 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Balloon Text"/>
<w:LsdException Locked=3D"false" Priority=3D"39" Name=3D"Table Grid"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Theme"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Placeholder =
Text"/>
<w:LsdException Locked=3D"false" Priority=3D"1" QFormat=3D"true" =
Name=3D"No Spacing"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light =
Shading"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid =
3"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful =
List"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful =
Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Revision"/>
<w:LsdException Locked=3D"false" Priority=3D"34" QFormat=3D"true" =
Name=3D"List Paragraph"/>
<w:LsdException Locked=3D"false" Priority=3D"29" QFormat=3D"true" =
Name=3D"Quote"/>
<w:LsdException Locked=3D"false" Priority=3D"30" QFormat=3D"true" =
Name=3D"Intense Quote"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"19" QFormat=3D"true" =
Name=3D"Subtle Emphasis"/>
<w:LsdException Locked=3D"false" Priority=3D"21" QFormat=3D"true" =
Name=3D"Intense Emphasis"/>
<w:LsdException Locked=3D"false" Priority=3D"31" QFormat=3D"true" =
Name=3D"Subtle Reference"/>
<w:LsdException Locked=3D"false" Priority=3D"32" QFormat=3D"true" =
Name=3D"Intense Reference"/>
<w:LsdException Locked=3D"false" Priority=3D"33" QFormat=3D"true" =
Name=3D"Book Title"/>
<w:LsdException Locked=3D"false" Priority=3D"37" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Bibliography"/>
<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" QFormat=3D"true" Name=3D"TOC Heading"/>
<w:LsdException Locked=3D"false" Priority=3D"41" Name=3D"Plain Table =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"42" Name=3D"Plain Table =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"43" Name=3D"Plain Table =
3"/>
<w:LsdException Locked=3D"false" Priority=3D"44" Name=3D"Plain Table =
4"/>
<w:LsdException Locked=3D"false" Priority=3D"45" Name=3D"Plain Table =
5"/>
<w:LsdException Locked=3D"false" Priority=3D"40" Name=3D"Grid Table =
Light"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 3"/>
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</style><![endif]--></head><body lang=3DEN-US link=3D"#467886" =
vlink=3D"#96607D" style=3D'tab-interval:.5in;word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><font size=3D2 =
face=3DAptos><span =
style=3D'font-size:11.0pt;mso-ascii-font-family:Aptos;mso-hansi-font-fami=
ly:Aptos;mso-bidi-font-family:"Times New Roman"'>Simon, I have an =
expansion tank in my BJ8 using the original metal tank from an MG =
Midget.<span style=3D'mso-spacerun:yes'>&nbsp; </span>I also have the =
stock 7 psi cap on both the radiator and the overflow tank and a clear =
&#8220;overflow&#8221; hose on the radiator neck to the tank.<span =
style=3D'mso-spacerun:yes'>&nbsp; </span>The tank captures any overflow =
from the radiator and I can see the system operate with the clear =
tubing.<span style=3D'mso-spacerun:yes'>&nbsp; </span>When hot, the flow =
is out to the tank and back into the radiator as it cools.<span =
style=3D'mso-spacerun:yes'>&nbsp; </span>Excess coolant in the overflow =
tank can flow out to the ground through the tank overflow =
connection.<o:p></o:p></span></font></p><p class=3DMsoNormal><font =
size=3D2 face=3DAptos><span =
style=3D'font-size:11.0pt;mso-ascii-font-family:Aptos;mso-hansi-font-fami=
ly:Aptos;mso-bidi-font-family:"Times New =
Roman"'><o:p>&nbsp;</o:p></span></font></p><p class=3DMsoNormal><font =
size=3D2 face=3DAptos><span =
style=3D'font-size:11.0pt;mso-ascii-font-family:Aptos;mso-hansi-font-fami=
ly:Aptos;mso-bidi-font-family:"Times New Roman"'>Steve =
Byers<o:p></o:p></span></font></p><p class=3DMsoNormal><font size=3D2 =
face=3DAptos><span =
style=3D'font-size:11.0pt;mso-ascii-font-family:Aptos;mso-hansi-font-fami=
ly:Aptos;mso-bidi-font-family:"Times New Roman"'>BJ8 =
Registry<o:p></o:p></span></font></p><p class=3DMsoNormal><font size=3D2 =
face=3DAptos><span =
style=3D'font-size:11.0pt;mso-ascii-font-family:Aptos;mso-hansi-font-fami=
ly:Aptos;mso-bidi-font-family:"Times New Roman"'>AHCA Delegate at =
Large<o:p></o:p></span></font></p><p class=3DMsoNormal><font size=3D2 =
face=3DAptos><span =
style=3D'font-size:11.0pt;mso-ascii-font-family:Aptos;mso-hansi-font-fami=
ly:Aptos;mso-bidi-font-family:"Times New =
Roman"'><o:p>&nbsp;</o:p></span></font></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><font size=3D2 face=3DCalibri><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-fo=
nt-family:"Times New =
Roman";font-weight:bold'>From:</span></font></b><font size=3D2 =
face=3DCalibri><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-fo=
nt-family:"Times New Roman"'> Healeys =
&lt;[email-masked]&gt; <b><span =
style=3D'font-weight:bold'>On Behalf <span class=3DGramE>Of</span> =
</span></b>Simon Lachlan via Healeys<br><b><span =
style=3D'font-weight:bold'>Sent:</span></b> Saturday, October 11, 2025 =
11:32 AM<br><b><span style=3D'font-weight:bold'>To:</span></b> 'Healeys' =
&lt;[email-masked]&gt;<br><b><span =
style=3D'font-weight:bold'>Subject:</span></b> [Healeys] Radiator cap =
with expansion tank.<o:p></o:p></span></font></p></div></div><p =
class=3DMsoNormal><font size=3D3 face=3DAptos><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p><p><font =
size=3D3 face=3DAptos><span lang=3DEN-GB =
style=3D'font-size:12.0pt;mso-ansi-language:EN-GB'>Forgive another =
stupid question but it&#8217;s sensible to be =
sure&#8230;&#8230;&#8230;.</span><o:p></o:p></font></p><p><font size=3D3 =
face=3DAptos><span lang=3DEN-GB =
style=3D'font-size:12.0pt;mso-ansi-language:EN-GB'>Am I right in =
assuming(!) that, if one fits an expansion tank, the standard cap is =
moved from the radiator to the expansion tank and is replaced by a =
blanking(?) cap ie one which has no spring, no means of relief etcetc? =
Seem logical to me but logic has let me down =
before.</span><o:p></o:p></font></p><p><font size=3D3 face=3DAptos><span =
lang=3DEN-GB =
style=3D'font-size:12.0pt;mso-ansi-language:EN-GB'>Simon</span><o:p></o:p=
></font></p></div></body></html>
------=_NextPart_000_05FF_01DC3AB3.92AFBD20--

--===============0184742802743024781==
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[email-masked]

--===============0184742802743024781==--

---

From: Harold Manifold <[email-masked]>
Date: Sat, 11 Oct 2025 11:48:58 -0700

--===============1492047936204384551==

--0000000000007b13860640e67d9f
Content-Transfer-Encoding: quoted-printable

Hi Simon,

The radiator cap needs to be one designed for a closed coolant recovery
system. While it will look similar to a standard cap, it will have two
rubber gaskets=E2=80=94one at the top and one at the bottom of the radiator=
 neck.
When the cooling system pressure exceeds the cap's rated pressure (7 psi),
coolant will flow through the overflow tube to the recovery tank. As the
coolant cools, it will then be drawn back into the radiator.

There are two general types of closed systems: an expansion tank and a
recovery tank. Expansion tanks are pressurized and are not the best option
for a Healey. For a recovery tank, the hose goes to the bottom of the tank,
and the tank itself operates at atmospheric pressure.

The recovery tank from a TR6 is a good fit for the 4-inch round hole in the
support that extends from the scuttle to the frame.

Harold

On Sat, Oct 11, 2025 at 11:05=E2=80=AFAM sbyers--- via Healeys <
[email-masked]> wrote:

> Simon, I have an expansion tank in my BJ8 using the original metal tank
> from an MG Midget.  I also have the stock 7 psi cap on both the radiator
> and the overflow tank and a clear =E2=80=9Coverflow=E2=80=9D hose on the =
radiator neck to
> the tank.  The tank captures any overflow from the radiator and I can see
> the system operate with the clear tubing.  When hot, the flow is out to
> the tank and back into the radiator as it cools.  Excess coolant in the
> overflow tank can flow out to the ground through the tank overflow
> connection.
>
>
>
> Steve Byers
>
> BJ8 Registry
>
> AHCA Delegate at Large
>
>
>
> *From:* Healeys <[email-masked]> *On Behalf Of *Simon
> Lachlan via Healeys
> *Sent:* Saturday, October 11, 2025 11:32 AM
> *To:* 'Healeys' <[email-masked]>
> *Subject:* [Healeys] Radiator cap with expansion tank.
>
>
>
> http://autox.team.net/mailman/options/healeys/[email-masked]
>
>

--0000000000007b13860640e67d9f
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi Simon,</div><div><br></div><div>The radiator cap n=
eeds to be one designed for a closed coolant recovery system. While it will=
 look similar to a standard cap, it will have two rubber gaskets=E2=80=94on=
e at the top and one at the bottom of the radiator neck. When the cooling s=
ystem pressure exceeds the cap&#39;s rated pressure (7 psi), coolant will f=
low through the overflow tube to the recovery tank. As the coolant cools, i=
t will then be drawn back into the radiator.</div><div><br></div><div>There=
 are two general types of closed systems: an expansion tank and a recovery =
tank. Expansion tanks are pressurized and are not the best option for a Hea=
ley. For a recovery tank, the hose goes to the bottom of the tank, and the =
tank itself operates at atmospheric pressure.</div><div><br></div><div>The =
recovery tank from a TR6 is a good fit for the 4-inch round hole in the sup=
port that extends from the scuttle to the frame.</div><div><br></div><div>H=
arold</div></div><br><div class=3D"gmail_quote gmail_quote_container"><div =
dir=3D"ltr" class=3D"gmail_attr">On Sat, Oct 11, 2025 at 11:05=E2=80=AFAM s=
byers--- via Healeys &lt;<a href=3D"mailto:[email-masked]">healeys@=
autox.team.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padd=
ing-left:1ex"><div class=3D"msg-2065818350658320836"><div lang=3D"EN-US" st=
yle=3D"overflow-wrap: break-word;"><div class=3D"m_-2065818350658320836Word=
Section1"><p class=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><span styl=
e=3D"font-size:11pt">Simon, I have an expansion tank in my BJ8 using the or=
iginal metal tank from an MG Midget.<span>=C2=A0 </span>I also have the sto=
ck 7 psi cap on both the radiator and the overflow tank and a clear =E2=80=
=9Coverflow=E2=80=9D hose on the radiator neck to the tank.<span>=C2=A0 </s=
pan>The tank captures any overflow from the radiator and I can see the syst=
em operate with the clear tubing.<span>=C2=A0 </span>When hot, the flow is =
out to the tank and back into the radiator as it cools.<span>=C2=A0 </span>=
Excess coolant in the overflow tank can flow out to the ground through the =
tank overflow connection.<u></u><u></u></span></font></p><p class=3D"MsoNor=
mal"><font size=3D"2" face=3D"Aptos"><span style=3D"font-size:11pt"><u></u>=
=C2=A0<u></u></span></font></p><p class=3D"MsoNormal"><font size=3D"2" face=
=3D"Aptos"><span style=3D"font-size:11pt">Steve Byers<u></u><u></u></span><=
/font></p><p class=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><span styl=
e=3D"font-size:11pt">BJ8 Registry<u></u><u></u></span></font></p><p class=
=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"font-size:11p=
t">AHCA Delegate at Large<u></u><u></u></span></font></p><p class=3D"MsoNor=
mal"><font size=3D"2" face=3D"Aptos"><span style=3D"font-size:11pt"><u></u>=
=C2=A0<u></u></span></font></p><div><div style=3D"border-right:none;border-=
bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:=
3pt 0in 0in"><p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><s=
pan style=3D"font-size:11pt;font-family:Calibri,sans-serif;font-weight:bold=
">From:</span></font></b><font size=3D"2" face=3D"Calibri"><span style=3D"f=
ont-size:11pt;font-family:Calibri,sans-serif"> Healeys &lt;<a href=3D"mailt=
o:[email-masked]" target=3D"_blank">[email-masked]=
eam.net</a>&gt; <b><span style=3D"font-weight:bold">On Behalf <span class=
=3D"m_-2065818350658320836GramE">Of</span> </span></b>Simon Lachlan via Hea=
leys<br><b><span style=3D"font-weight:bold">Sent:</span></b> Saturday, Octo=
ber 11, 2025 11:32 AM<br><b><span style=3D"font-weight:bold">To:</span></b>=
 &#39;Healeys&#39; &lt;<a href=3D"mailto:[email-masked]" target=3D"=
_blank">[email-masked]</a>&gt;<br><b><span style=3D"font-weight:bol=
d">Subject:</span></b> [Healeys] Radiator cap with expansion tank.<u></u><u=
></u></span></font></p></div></div><p class=3D"MsoNormal"><font size=3D"3" =
face=3D"Aptos"><span style=3D"font-size:12pt"><u></u>=C2=A0<u></u></span></=
font></p><p><font size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"f=
ont-size:12pt">Forgive another stupid question but it=E2=80=99s sensible to=
 be sure=E2=80=A6=E2=80=A6=E2=80=A6.</span><u></u><u></u></font></p><p><fon=
t size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"font-size:12pt">A=
m I right in assuming(!) that, if one fits an expansion tank, the standard =
cap is moved from the radiator to the expansion tank and is replaced by a b=
lanking(?) cap ie one which has no spring, no means of relief etcetc? Seem =
logical to me but logic has let me down before.</span><u></u><u></u></font>=
</p><p><font size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"font-s=
ize:12pt">Simon</span><u></u><u></u></font></p></div></div>________________=
_______________________________<br>
rer" target=3D"_blank">http://www.team.net/donate.html</a><br>
<br>
Archive: <a href=3D"http://www.team.net/pipermail/healeys" rel=3D"noreferre=
r" target=3D"_blank">http://www.team.net/pipermail/healeys</a> <a href=3D"h=
ttp://autox.team.net/archive/healeys" rel=3D"noreferrer" target=3D"_blank">=
http://autox.team.net/archive/healeys</a><br>
<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]=
eam.net</a><br>
<a href=3D"http://autox.team.net/mailman/listinfo/healeys" rel=3D"noreferre=
r" target=3D"_blank">http://autox.team.net/mailman/listinfo/healeys</a><br>
<br>
s/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://autox.tea=
m.net/mailman/options/healeys/[email-masked]</a><br>
<br>
</div></blockquote></div>

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[email-masked]

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---

From: Michael Oritt via Healeys <[email-masked]>
Date: Sat, 11 Oct 2025 15:02:00 -0400

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By running the hose from the radiator neck to the *bottom* of the
"expansion" tank you will have created a coolant recovery system--the
slight vacuum created in the radiator by the engine's cooling down pulls
open and unseals the pressure plate on the radiator cap, thus "recovering"
the overflow back into the radiator.  Probable result:  no more coolant on
the garage floor and no need to top things off.

Best--Michael Oritt

radiator neck to
> http://autox.team.net/mailman/options/healeys/[email-masked]
>
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">By ru=
nning the hose from the radiator neck to the <i><b>bottom</b></i> of the &q=
uot;expansion&quot; tank you will have created a coolant recovery system--t=
he slight vacuum created in the radiator by the engine&#39;s cooling down p=
ulls open and unseals the pressure plate on the radiator cap, thus &quot;re=
covering&quot; the overflow back into=C2=A0the radiator.=C2=A0 Probable=C2=
=A0result:=C2=A0 no more coolant on the garage floor and no need to top thi=
ngs off.=C2=A0</div><div class=3D"gmail_default" style=3D"color:#3333ff"><b=
r></div><div class=3D"gmail_default" style=3D"color:#3333ff">Best--Michael =
Oritt</div></div><br><div class=3D"gmail_quote gmail_quote_container"><div =
dir=3D"ltr" class=3D"gmail_attr">On Sat, Oct 11, 2025 at 2:24=E2=80=AFPM sb=
yers--- via Healeys &lt;<a href=3D"mailto:[email-masked]">healeys@a=
utox.team.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddi=
ng-left:1ex"><div class=3D"msg4813553479534083906"><div lang=3D"EN-US" styl=
e=3D"overflow-wrap: break-word;"><div class=3D"m_4813553479534083906WordSec=
tion1"><p class=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=
=3D"font-size:11pt">Simon, I have an expansion tank in my BJ8 using the ori=
ginal metal tank from an MG Midget.<span>=C2=A0 </span>I also have the stoc=
k 7 psi cap on both the radiator and the overflow tank and a clear =E2=80=
=9Coverflow=E2=80=9D hose on the radiator neck to the tank.<span>=C2=A0 </s=
pan>The tank captures any overflow from the radiator and I can see the syst=
em operate with the clear tubing.<span>=C2=A0 </span>When hot, the flow is =
out to the tank and back into the radiator as it cools.<span>=C2=A0 </span>=
Excess coolant in the overflow tank can flow out to the ground through the =
tank overflow connection.<u></u><u></u></span></font></p><p class=3D"MsoNor=
mal"><font size=3D"2" face=3D"Aptos"><span style=3D"font-size:11pt"><u></u>=
=C2=A0<u></u></span></font></p><p class=3D"MsoNormal"><font size=3D"2" face=
=3D"Aptos"><span style=3D"font-size:11pt">Steve Byers<u></u><u></u></span><=
/font></p><p class=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><span styl=
e=3D"font-size:11pt">BJ8 Registry<u></u><u></u></span></font></p><p class=
=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"font-size:11p=
t">AHCA Delegate at Large<u></u><u></u></span></font></p><p class=3D"MsoNor=
mal"><font size=3D"2" face=3D"Aptos"><span style=3D"font-size:11pt"><u></u>=
=C2=A0<u></u></span></font></p><div><div style=3D"border-right:none;border-=
bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:=
3pt 0in 0in"><p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><s=
pan style=3D"font-size:11pt;font-family:Calibri,sans-serif;font-weight:bold=
">From:</span></font></b><font size=3D"2" face=3D"Calibri"><span style=3D"f=
ont-size:11pt;font-family:Calibri,sans-serif"> Healeys &lt;<a href=3D"mailt=
o:[email-masked]" target=3D"_blank">[email-masked]=
eam.net</a>&gt; <b><span style=3D"font-weight:bold">On Behalf <span class=
=3D"m_4813553479534083906GramE">Of</span> </span></b>Simon Lachlan via Heal=
eys<br><b><span style=3D"font-weight:bold">Sent:</span></b> Saturday, Octob=
er 11, 2025 11:32 AM<br><b><span style=3D"font-weight:bold">To:</span></b> =
&#39;Healeys&#39; &lt;<a href=3D"mailto:[email-masked]" target=3D"_=
blank">[email-masked]</a>&gt;<br><b><span style=3D"font-weight:bold=
">Subject:</span></b> [Healeys] Radiator cap with expansion tank.<u></u><u>=
</u></span></font></p></div></div><p class=3D"MsoNormal"><font size=3D"3" f=
ace=3D"Aptos"><span style=3D"font-size:12pt"><u></u>=C2=A0<u></u></span></f=
ont></p><p><font size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"fo=
nt-size:12pt">Forgive another stupid question but it=E2=80=99s sensible to =
be sure=E2=80=A6=E2=80=A6=E2=80=A6.</span><u></u><u></u></font></p><p><font=
 size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"font-size:12pt">Am=
 I right in assuming(!) that, if one fits an expansion tank, the standard c=
ap is moved from the radiator to the expansion tank and is replaced by a bl=
anking(?) cap ie one which has no spring, no means of relief etcetc? Seem l=
ogical to me but logic has let me down before.</span><u></u><u></u></font><=
/p><p><font size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"font-si=
ze:12pt">Simon</span><u></u><u></u></font></p></div></div>_________________=
______________________________<br>
rer" target=3D"_blank">http://www.team.net/donate.html</a><br>
<br>
Archive: <a href=3D"http://www.team.net/pipermail/healeys" rel=3D"noreferre=
r" target=3D"_blank">http://www.team.net/pipermail/healeys</a> <a href=3D"h=
ttp://autox.team.net/archive/healeys" rel=3D"noreferrer" target=3D"_blank">=
http://autox.team.net/archive/healeys</a><br>
<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]=
eam.net</a><br>
<a href=3D"http://autox.team.net/mailman/listinfo/healeys" rel=3D"noreferre=
r" target=3D"_blank">http://autox.team.net/mailman/listinfo/healeys</a><br>
<br>
s/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://auto=
x.team.net/mailman/options/healeys/[email-masked]</a><br>
<br>
</div></blockquote></div>

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[email-masked]

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---

From: JSARCH via Healeys <[email-masked]>
Date: Sat, 11 Oct 2025 21:27:07 -0300

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This respones is correct.

=20

From: Healeys <[email-masked]> On Behalf Of Jim Ryan
Sent: Saturday, October 11, 2025 2:03 PM
To: Simon Lachlan <[email-masked]>
Cc: Healeys <[email-masked]>
Subject: Re: [Healeys] Radiator cap with expansion tank.

=20

Hey Simon,

=20

No, the radiator cap stays on the radiator. Increased pressure in the =
radiator raises the boiling point. If the radiator gets hot enough for =
the pressure to release the cab then the overflow will go into the wall =
bottle. Once it cools down it's supposed to get pulled back into the =
radiator. Of course, this is a British car so theory and reality May =
differ. But you definitely want to leave a lady in the cop on the =
radiator.

=20

=20

=20

Jim Ryan

=C2=A9=C2=BF=C2=A9=C2=AC

=20

On Sat, Oct 11, 2025, 11:45=E2=80=AFAM Simon Lachlan via Healeys =

Forgive another stupid question but it=E2=80=99s sensible to be =
sure=E2=80=A6=E2=80=A6=E2=80=A6.

Am I right in assuming(!) that, if one fits an expansion tank, the =
standard cap is moved from the radiator to the expansion tank and is =
replaced by a blanking(?) cap ie one which has no spring, no means of =
relief etcetc? Seem logical to me but logic has let me down before.

Simon

Archive: http://www.team.net/pipermail/healeys =
http://autox.team.net/archive/healeys

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<html xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" =
xmlns=3D"http://www.w3.org/TR/REC-html40"><head><meta =
http-equiv=3DContent-Type content=3D"text/html; charset=3Dutf-8"><meta =
name=3DGenerator content=3D"Microsoft Word 15 (filtered =
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--></style></head><body lang=3DEN-US link=3Dblue vlink=3Dpurple =
style=3D'word-wrap:break-word'><div class=3DWordSection1><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>This =
respones is correct.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Healeys &lt;[email-masked]&gt; <b>On Behalf Of </b>Jim =
Ryan<br><b>Sent:</b> Saturday, October 11, 2025 2:03 PM<br><b>To:</b> =
Simon Lachlan &lt;[email-masked]&gt;<br><b>Cc:</b> =
Healeys &lt;[email-masked]&gt;<br><b>Subject:</b> Re: [Healeys] =
Radiator cap with expansion tank.<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>Hey Simon,<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>No, the radiator cap stays on the radiator. Increased =
pressure in the radiator raises the boiling point. If the radiator gets =
hot enough for the pressure to release the cab then the overflow will go =
into the wall bottle. Once it cools down it's supposed to get pulled =
back into the radiator. Of course, this is a British car so theory and =
reality May differ. But you definitely want to leave a lady in the cop =
on the radiator.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><div><p><span =
style=3D'font-size:10.0pt;color:navy'>Jim Ryan</span><span =
style=3D'font-size:9.5pt'><o:p></o:p></span></p><p><span =
style=3D'font-size:9.5pt'>=C2=A9=C2=BF=C2=A9=C2=AC<o:p></o:p></span></p><=
/div></div></div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>On Sat, Oct 11, 2025, 11:45<span =
style=3D'font-family:"Arial",sans-serif'>=E2=80=AF</span>AM Simon =
Lachlan via Healeys &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]</a>&gt; =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><p><span =
lang=3DEN-GB>Forgive another stupid question but it=E2=80=99s sensible =
to be sure=E2=80=A6=E2=80=A6=E2=80=A6.</span><o:p></o:p></p><p><span =
lang=3DEN-GB>Am I right in assuming(!) that, if one fits an expansion =
tank, the standard cap is moved from the radiator to the expansion tank =
and is replaced by a blanking(?) cap ie one which has no spring, no =
means of relief etcetc? Seem logical to me but logic has let me down =
before.</span><o:p></o:p></p><p><span =
lang=3DEN-GB>Simon</span><o:p></o:p></p></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
_____<br>Support Team.Net <a href=3D"http://www.team.net/donate.html" =
target=3D"_blank">http://www.team.net/donate.html</a><br>Suggested =
annual donation&nbsp; $12.75<br><br>Archive: <a =
href=3D"http://www.team.net/pipermail/healeys" =
target=3D"_blank">http://www.team.net/pipermail/healeys</a> <a =
href=3D"http://autox.team.net/archive/healeys" =
target=3D"_blank">http://autox.team.net/archive/healeys</a><br><br><a =
href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a><br><a =
href=3D"http://autox.team.net/mailman/listinfo/healeys" =
target=3D"_blank">http://autox.team.net/mailman/listinfo/healeys</a><br><=
br>Unsubscribe/Manage: <a =
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yan.com</a><o:p></o:p></p></blockquote></div></div></body></html>
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From: JSARCH via Healeys <[email-masked]>
Date: Sat, 11 Oct 2025 21:27:07 -0300

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All you really need to do is to not top off the radiator coolant. Keep =
the coolant level 1=E2=80=9D to 1-1/2=E2=80=9D or possible a little more =
below the point where the radiator cap seals the top of the radiator =
chamber will allow enough space for the coolant to expand and contract =
without sending coolant through the overflow tube.

=20

Best - John=20

=20

From: Healeys <[email-masked]> On Behalf Of Michael =
Oritt via Healeys
Sent: Saturday, October 11, 2025 4:02 PM
To: [email-masked]
Cc: Healeys <[email-masked]>
Subject: Re: [Healeys] Radiator cap with expansion tank.

=20

By running the hose from the radiator neck to the bottom of the =
"expansion" tank you will have created a coolant recovery system--the =
slight vacuum created in the radiator by the engine's cooling down pulls =
open and unseals the pressure plate on the radiator cap, thus =
"recovering" the overflow back into the radiator.  Probable result:  no =
more coolant on the garage floor and no need to top things off.=20

=20

Best--Michael Oritt

=20

On Sat, Oct 11, 2025 at 2:24=E2=80=AFPM sbyers--- via Healeys =

Simon, I have an expansion tank in my BJ8 using the original metal tank =
from an MG Midget.  I also have the stock 7 psi cap on both the radiator =
and the overflow tank and a clear =E2=80=9Coverflow=E2=80=9D hose on the =
radiator neck to the tank.  The tank captures any overflow from the =
radiator and I can see the system operate with the clear tubing.  When =
hot, the flow is out to the tank and back into the radiator as it cools. =
 Excess coolant in the overflow tank can flow out to the ground through =
the tank overflow connection.

=20

Steve Byers

BJ8 Registry

AHCA Delegate at Large

=20

From: Healeys <[email-masked] =
Healeys
Sent: Saturday, October 11, 2025 11:32 AM
Subject: [Healeys] Radiator cap with expansion tank.

=20

Simon

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--></style></head><body lang=3DEN-US link=3Dblue vlink=3Dpurple =
style=3D'word-wrap:break-word'><div class=3DWordSection1><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>All you =
really need to do is to not top off the radiator coolant. Keep the =
coolant level 1=E2=80=9D to 1-1/2=E2=80=9D or possible a little more =
below the point where the radiator cap seals the top of the radiator =
chamber will allow enough space for the coolant to expand and contract =
without sending coolant through the overflow =
tube.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Best - John =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Healeys &lt;[email-masked]&gt; <b>On Behalf Of =
</b>Michael Oritt via Healeys<br><b>Sent:</b> Saturday, October 11, 2025 =
4:02 PM<br><b>To:</b> [email-masked]<br><b>Cc:</b> Healeys =
&lt;[email-masked]&gt;<br><b>Subject:</b> Re: [Healeys] Radiator =
cap with expansion tank.<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal><span style=3D'color:#3333FF'>By running the hose from =
the radiator neck to the <b><i>bottom</i></b> of the =
&quot;expansion&quot; tank you will have created a coolant recovery =
system--the slight vacuum created in the radiator by the engine's =
cooling down pulls open and unseals the pressure plate on the radiator =
cap, thus &quot;recovering&quot; the overflow back into&nbsp;the =
radiator.&nbsp; Probable&nbsp;result:&nbsp; no more coolant on the =
garage floor and no need to top things =
off.&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'color:#3333FF'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'color:#3333FF'>Best--Michael =
Oritt<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>On =
Sat, Oct 11, 2025 at 2:24<span =
style=3D'font-family:"Arial",sans-serif'>=E2=80=AF</span>PM sbyers--- =
via Healeys &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]</a>&gt; =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt'>Simon, I have an expansion tank in my BJ8 =
using the original metal tank from an MG Midget.&nbsp; I also have the =
stock 7 psi cap on both the radiator and the overflow tank and a clear =
=E2=80=9Coverflow=E2=80=9D hose on the radiator neck to the tank.&nbsp; =
The tank captures any overflow from the radiator and I can see the =
system operate with the clear tubing.&nbsp; When hot, the flow is out to =
the tank and back into the radiator as it cools.&nbsp; Excess coolant in =
the overflow tank can flow out to the ground through the tank overflow =
connection.</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt'>Steve Byers</span><o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt'>BJ8 Registry</span><o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt'>AHCA Delegate at =
Large</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt'>&nbsp;</span><o:p></o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Healeys &lt;<a href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a>&gt; <b>On Behalf =
<span class=3Dm4813553479534083906grame>Of</span> </b>Simon Lachlan via =
Healeys<br><b>Sent:</b> Saturday, October 11, 2025 11:32 =
AM<br><b>To:</b> 'Healeys' &lt;<a href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a>&gt;<br><b>Subject:</b> =
[Healeys] Radiator cap with expansion =
tank.</span><o:p></o:p></p></div></div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p><p><span lang=3DEN-GB>Forgive another stupid question but =
it=E2=80=99s sensible to be =
sure=E2=80=A6=E2=80=A6=E2=80=A6.</span><o:p></o:p></p><p><span =
lang=3DEN-GB>Am I right in assuming(!) that, if one fits an expansion =
tank, the standard cap is moved from the radiator to the expansion tank =
and is replaced by a blanking(?) cap ie one which has no spring, no =
means of relief etcetc? Seem logical to me but logic has let me down =
before.</span><o:p></o:p></p><p><span =
lang=3DEN-GB>Simon</span><o:p></o:p></p></div></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
_____<br>Support Team.Net <a href=3D"http://www.team.net/donate.html" =
target=3D"_blank">http://www.team.net/donate.html</a><br>Suggested =
annual donation&nbsp; $12.75<br><br>Archive: <a =
href=3D"http://www.team.net/pipermail/healeys" =
target=3D"_blank">http://www.team.net/pipermail/healeys</a> <a =
href=3D"http://autox.team.net/archive/healeys" =
target=3D"_blank">http://autox.team.net/archive/healeys</a><br><br><a =
href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a><br><a =
href=3D"http://autox.team.net/mailman/listinfo/healeys" =
target=3D"_blank">http://autox.team.net/mailman/listinfo/healeys</a><br><=
br>Unsubscribe/Manage: <a =
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.com" =
target=3D"_blank">http://autox.team.net/mailman/options/healeys/michael.o=
[email-masked]</a><o:p></o:p></p></div></blockquote></div></div></body></=
html>
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[email-masked]

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---

From: Harold Manifold <[email-masked]>
Date: Sat, 11 Oct 2025 17:50:39 -0700

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The issue with installing an expansion tank on an Austin Healey is the
difficulty in finding a location under the hood. For an expansion tank to
work properly the neck and cap must be at the highest point in the cooling
system so air can rise to the highest point.

A coolant recovery tank, on the other hand, can be installed at any
elevation which is why I suggested they are more suitable for our Healeys

See the following from Canton who are experts in the field.

Expansion Tank Set Up:
An expansion tank is part of the pressurized section of the coolant system.
An expansion tank can easily be recognized by the neck and cap used. Since
the tank is under pressure it will require a pressure rated cap and neck.
The pressure relief in the expansion tank should be the highest point in
your coolant system.

Harold

On Sat, Oct 11, 2025 at 5:35=E2=80=AFPM JSARCH via Healeys <[email-masked]=
eam.net>
wrote:

> *From:* Healeys <[email-masked]> *On Behalf Of *Jim Ryan
> *Sent:* Saturday, October 11, 2025 2:03 PM
> *To:* Simon Lachlan <[email-masked]>
> *Cc:* Healeys <[email-masked]>
> *Subject:* Re: [Healeys] Radiator cap with expansion tank.
>
>
>
> Hey Simon,
>
>
>
> radiator raises the boiling point. If the radiator gets hot enough for th=
e
> pressure to release the cab then the overflow will go into the wall bottl=
e.
> relief etcetc? Seem logical to me but logic has let me down before.

--000000000000d335080640eb8aac
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<div dir=3D"ltr">The issue with installing an expansion tank on an Austin H=
ealey is the difficulty in finding a location under the hood. For an expans=
ion tank to work properly the neck and cap must be at the highest point in =
the cooling system so air can rise to the highest point.<div><br></div><div=
>A coolant recovery tank, on the other hand, can be installed at any elevat=
ion which is why I suggested they are more suitable for our Healeys<br><div=
><br></div><div>See the following from Canton who are experts in the field.=
</div><div><br></div><div><p class=3D"MsoNormal" style=3D"margin:0cm 0cm 0.=
0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;">Expansion Ta=
nk Set Up:<br>
An expansion tank is part of the pressurized section of the coolant system.=
 An
expansion tank can easily be recognized by the neck and cap used. Since the
tank is under pressure it will require a pressure rated cap and neck. The
pressure relief in the expansion tank should be the highest point in your
coolant system.</p><p class=3D"MsoNormal" style=3D"margin:0cm 0cm 0.0001pt;=
font-size:12pt;font-family:&quot;Times New Roman&quot;"><br></p><p class=3D=
"MsoNormal" style=3D"margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:&qu=
ot;Times New Roman&quot;">Harold</p></div></div></div><br><div class=3D"gma=
il_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Sa=
t, Oct 11, 2025 at 5:35=E2=80=AFPM JSARCH via Healeys &lt;<a href=3D"mailto=
:[email-masked]">[email-masked]</a>&gt; wrote:<br></div><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-lef=
t:1px solid rgb(204,204,204);padding-left:1ex"><div class=3D"msg-6620934605=
535635207"><div lang=3D"EN-US" style=3D"overflow-wrap: break-word;"><div cl=
ass=3D"m_-6620934605535635207WordSection1"><p class=3D"MsoNormal"><span sty=
le=3D"font-size:11pt;font-family:Calibri,sans-serif">This respones is corre=
ct.<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-size=
:11pt;font-family:Calibri,sans-serif"><u></u>=C2=A0<u></u></span></p><div s=
tyle=3D"border-right:none;border-bottom:none;border-left:none;border-top:1p=
t solid rgb(225,225,225);padding:3pt 0in 0in"><p class=3D"MsoNormal"><b><sp=
an style=3D"font-size:11pt;font-family:Calibri,sans-serif">From:</span></b>=
<span style=3D"font-size:11pt;font-family:Calibri,sans-serif"> Healeys &lt;=
<a href=3D"mailto:[email-masked]" target=3D"_blank">healeys=
[email-masked]</a>&gt; <b>On Behalf Of </b>Jim Ryan<br><b>Sent:</b=
> Saturday, October 11, 2025 2:03 PM<br><b>To:</b> Simon Lachlan &lt;<a hre=
f=3D"mailto:[email-masked]" target=3D"_blank">simon.lach=
[email-masked]</a>&gt;<br><b>Cc:</b> Healeys &lt;<a href=3D"mailto=
:[email-masked]" target=3D"_blank">[email-masked]</a>&gt;<b=
r><b>Subject:</b> Re: [Healeys] Radiator cap with expansion tank.<u></u><u>=
</u></span></p></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><d=
iv><p class=3D"MsoNormal">Hey Simon,<u></u><u></u></p></div><div><p class=
=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal">No=
, the radiator cap stays on the radiator. Increased pressure in the radiato=
r raises the boiling point. If the radiator gets hot enough for the pressur=
e to release the cab then the overflow will go into the wall bottle. Once i=
t cools down it&#39;s supposed to get pulled back into the radiator. Of cou=
rse, this is a British car so theory and reality May differ. But you defini=
tely want to leave a lady in the cop on the radiator.<u></u><u></u></p></di=
v><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=
=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal"><u=
></u>=C2=A0<u></u></p></div><div><div><p><span style=3D"font-size:10pt;colo=
r:navy">Jim Ryan</span><span style=3D"font-size:9.5pt"><u></u><u></u></span=
></p><p><span style=3D"font-size:9.5pt">=C2=A9=C2=BF=C2=A9=C2=AC<u></u><u><=
/u></span></p></div></div></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u>=
</p><div><div><p class=3D"MsoNormal">On Sat, Oct 11, 2025, 11:45<span style=
=3D"font-family:Arial,sans-serif">=E2=80=AF</span>AM Simon Lachlan via Heal=
eys &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">healeys=
@autox.team.net</a>&gt; wrote:<u></u><u></u></p></div><blockquote style=3D"=
border-top:none;border-right:none;border-bottom:none;border-left:1pt solid =
rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in=
"><div><p><span lang=3D"EN-GB">Forgive another stupid question but it=E2=80=
=99s sensible to be sure=E2=80=A6=E2=80=A6=E2=80=A6.</span><u></u><u></u></=
p><p><span lang=3D"EN-GB">Am I right in assuming(!) that, if one fits an ex=
pansion tank, the standard cap is moved from the radiator to the expansion =
tank and is replaced by a blanking(?) cap ie one which has no spring, no me=
ans of relief etcetc? Seem logical to me but logic has let me down before.<=
/span><u></u><u></u></p><p><span lang=3D"EN-GB">Simon</span><u></u><u></u><=
/p></div><p class=3D"MsoNormal" style=3D"margin-bottom:12pt">______________=
_________________________________<br>Support Team.Net <a href=3D"http://www=
.team.net/donate.html" target=3D"_blank">http://www.team.net/donate.html</a=
><br>Suggested annual donation=C2=A0 $12.75<br><br>Archive: <a href=3D"http=
://www.team.net/pipermail/healeys" target=3D"_blank">http://www.team.net/pi=
permail/healeys</a> <a href=3D"http://autox.team.net/archive/healeys" targe=
t=3D"_blank">http://autox.team.net/archive/healeys</a><br><br><a href=3D"ma=
ilto:[email-masked]" target=3D"_blank">[email-masked]</a><b=
r><a href=3D"http://autox.team.net/mailman/listinfo/healeys" target=3D"_bla=
nk">http://autox.team.net/mailman/listinfo/healeys</a><br><br>Unsubscribe/M=
anage: <a href=3D"http://autox.team.net/mailman/options/healeys/ryan@jimrya=
n.com" target=3D"_blank">http://autox.team.net/mailman/options/healeys/ryan=
@jimryan.com</a><u></u><u></u></p></blockquote></div></div></div>__________=
_____________________________________<br>
rer" target=3D"_blank">http://www.team.net/donate.html</a><br>
<br>
Archive: <a href=3D"http://www.team.net/pipermail/healeys" rel=3D"noreferre=
r" target=3D"_blank">http://www.team.net/pipermail/healeys</a> <a href=3D"h=
ttp://autox.team.net/archive/healeys" rel=3D"noreferrer" target=3D"_blank">=
http://autox.team.net/archive/healeys</a><br>
<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]=
eam.net</a><br>
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r" target=3D"_blank">http://autox.team.net/mailman/listinfo/healeys</a><br>
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s/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://autox.tea=
m.net/mailman/options/healeys/[email-masked]</a><br>
<br>
</div></blockquote></div>

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[email-masked]

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---

From: Bob Haskell <[email-masked]>
Date: Sat, 11 Oct 2025 23:20:05 -0400

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FWIW, our '80 MGB has the cap on the expansion tank.  No cap on the 
radiator.  Ought to work the same as long as the hose between the two 
can withstand the coolant temperature/pressure. There's a fitting on top 
of the thermostat housing for topping off the cooling system.

Bob Haskell
Austin-Healey 3000 roadster registrar

On 10/11/25 13:03, Jim Ryan wrote:
> radiator raises the boiling point. If the radiator gets hot enough for 
> the pressure to release the cab then the overflow will go into the 
> wall bottle. Once it cools down it's supposed to get pulled back into 
> the radiator. Of course, this is a British car so theory and reality 
> May differ. But you definitely want to leave a lady in the cop on the 
> radiator.
>
>
>
> Jim Ryan
>
> ©¿©¬
>
>
> On Sat, Oct 11, 2025, 11:45 AM Simon Lachlan via Healeys 
> <[email-masked]> wrote:
>
>     Forgive another stupid question but it’s sensible to be sure……….
>
>     standard cap is moved from the radiator to the expansion tank and
>     is replaced by a blanking(?) cap ie one which has no spring, no
>     means of relief etcetc? Seem logical to me but logichas let me
>     down before.
>
>     Simon
>
> Support Team.Nethttp://www.team.net/donate.html
> Archive:http://www.team.net/pipermail/healeys http://autox.team.net/archive/healeys
>
> [email-masked]
> Unsubscribe/Manage:http://autox.team.net/mailman/options/healeys/[email-masked]
>
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  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <p>FWIW, our '80 MGB has the cap on the expansion tank.  No cap on
      the radiator.  Ought to work the same as long as the hose between
      the two can withstand the coolant temperature/pressure. There's a
      fitting on top of the thermostat housing for topping off the
      cooling system.</p>
    <pre class="moz-signature" cols="72">Bob Haskell
Austin-Healey 3000 roadster registrar</pre>
    <div class="moz-cite-prefix">On 10/11/25 13:03, Jim Ryan wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:[email-masked]">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="auto">
        <div>Hey Simon,</div>
        <div dir="auto"><br>
        </div>
        <div dir="auto">No, the radiator cap stays on the radiator.
          Increased pressure in the radiator raises the boiling point.
          If the radiator gets hot enough for the pressure to release
          the cab then the overflow will go into the wall bottle. Once
          it cools down it's supposed to get pulled back into the
          radiator. Of course, this is a British car so theory and
          reality May differ. But you definitely want to leave a lady in
          the cop on the radiator.</div>
        <div dir="auto"><br>
        </div>
        <div dir="auto"><br>
        </div>
        <div><br>
        </div>
        <div data-smartmail="gmail_signature">
          <div dir="ltr">
            <p style="font-size:12.8000001907349px"><span
                style="font-size:10pt;color:navy">Jim Ryan</span></p>
            <p style="font-size:12.8000001907349px">©¿©¬</p>
          </div>
        </div>
      </div>
      <br>
      <div class="gmail_quote gmail_quote_container">
        <div dir="ltr" class="gmail_attr">On Sat, Oct 11, 2025, 11:45 AM
          Simon Lachlan via Healeys &lt;<a
            href="mailto:[email-masked]" moz-do-not-send="true"
            class="moz-txt-link-freetext">[email-masked]</a>&gt;
          wrote:<br>
        </div>
        <blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
          <div>
            <p dir="LTR"><span lang="en-gb"><font face="Aptos">Forgive
                  another st</font></span><span lang="en-gb"></span><span
                lang="en-gb"></span><span lang="en-gb"><font
                  face="Aptos">upid question but it’s sensible to be
                  sure……….</font></span></p>
            <p dir="LTR"><span lang="en-gb"><font face="Aptos">Am I
                  right in assuming(!) that, if one fits an expan</font></span><span
                lang="en-gb"></span><span lang="en-gb"></span><span
                lang="en-gb"><font face="Aptos">sion tank, the standard
                  cap is moved from the radiator to the expansion tank
                  and is replaced by a blank</font></span><span
                lang="en-gb"></span><span lang="en-gb"></span><span
                lang="en-gb"><font face="Aptos">ing(?) cap ie one which
                  has no spring, no means of relief etcetc</font></span><span
                lang="en-gb"></span><span lang="en-gb"></span><span
                lang="en-gb"><font face="Aptos">? Seem logical to me but
                  logic</font></span><span lang="en-gb"></span><span
                lang="en-gb"></span><span lang="en-gb"><font
                  face="Aptos"> has let me down before</font></span><span
                lang="en-gb"></span><span lang="en-gb"></span><span
                lang="en-gb"><font face="Aptos">.</font></span></p>
            <p dir="LTR"><span lang="en-gb"><font face="Aptos">Simon</font></span><span
                lang="en-gb"></span><span lang="en-gb"></span><span
                lang="en-gb"></span></p>
          </div>
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      <pre wrap="" class="moz-quote-pre">_______________________________________________

Archive: <a class="moz-txt-link-freetext" href="http://www.team.net/pipermail/healeys">http://www.team.net/pipermail/healeys</a> <a class="moz-txt-link-freetext" href="http://autox.team.net/archive/healeys">http://autox.team.net/archive/healeys</a>

<a class="moz-txt-link-abbreviated" href="mailto:[email-masked]">[email-masked]</a>
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[email-masked]

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---

From: healeybruce--- via Healeys <[email-masked]>
Date: Sun, 19 Oct 2025 21:45:31 +0000

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I'm installing an expansion tank from an MGB on my BN7.  Per Dave Nock, I'm=
 using a 7-pound cap on the radiator and a 10-pound cap on the expansion ta=
nk.  The car is not back from paint yet, but that's what I'm going with.
________________________________
From: Healeys <[email-masked]> on behalf of sbyers--- via H=
ealeys <[email-masked]>
Sent: Saturday, October 11, 2025 10:33 AM
To: [email-masked] <[email-masked]>; =
'Healeys' <[email-masked]>
Subject: Re: [Healeys] Radiator cap with expansion tank.

Simon, I have an expansion tank in my BJ8 using the original metal tank fro=
m an MG Midget.  I also have the stock 7 psi cap on both the radiator and t=
he overflow tank and a clear =93overflow=94 hose on the radiator neck to th=
e tank.  The tank captures any overflow from the radiator and I can see the=
 system operate with the clear tubing.  When hot, the flow is out to the ta=
nk and back into the radiator as it cools.  Excess coolant in the overflow =
tank can flow out to the ground through the tank overflow connection.

Steve Byers

BJ8 Registry

AHCA Delegate at Large

From: Healeys <[email-masked]> On Behalf Of Simon Lachlan v=
ia Healeys
Sent: Saturday, October 11, 2025 11:32 AM
To: 'Healeys' <[email-masked]>
Subject: [Healeys] Radiator cap with expansion tank.

Forgive another stupid question but it=92s sensible to be sure=85=85=85.

Am I right in assuming(!) that, if one fits an expansion tank, the standard=
 cap is moved from the radiator to the expansion tank and is replaced by a =
blanking(?) cap ie one which has no spring, no means of relief etcetc? Seem=
 logical to me but logic has let me down before.

Simon

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<div style=3D"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, =
Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" clas=
s=3D"elementToProof">
I'm installing an expansion tank from an MGB on my BN7.&nbsp; Per Dave Nock=
, I'm using a 7-pound cap on the radiator and a 10-pound cap on the expansi=
on tank.&nbsp; The car is not back from paint yet, but that's what I'm goin=
g with.</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Healeys &lt;healeys-b=
[email-masked]&gt; on behalf of sbyers--- via Healeys &lt;healeys@au=
tox.team.net&gt;<br>
<b>Sent:</b> Saturday, October 11, 2025 10:33 AM<br>
<b>To:</b> [email-masked] &lt;[email-masked]=
lus.com&gt;; 'Healeys' &lt;[email-masked]&gt;<br>
<b>Subject:</b> Re: [Healeys] Radiator cap with expansion tank.</font>
<div>&nbsp;</div>
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<p class=3D"x_MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"fon=
t-size:11.0pt">Simon, I have an expansion tank in my BJ8 using the original=
 metal tank from an MG Midget.<span style=3D"">&nbsp;
</span>I also have the stock 7 psi cap on both the radiator and the overflo=
w tank and a clear =93overflow=94 hose on the radiator neck to the tank.<sp=
an style=3D"">&nbsp;
</span>The tank captures any overflow from the radiator and I can see the s=
ystem operate with the clear tubing.<span style=3D"">&nbsp;
</span>When hot, the flow is out to the tank and back into the radiator as =
it cools.<span style=3D"">&nbsp;
</span>Excess coolant in the overflow tank can flow out to the ground throu=
gh the tank overflow connection.</span></font></p>
<p class=3D"x_MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"fon=
t-size:11.0pt">&nbsp;</span></font></p>
<p class=3D"x_MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"fon=
t-size:11.0pt">Steve Byers</span></font></p>
<p class=3D"x_MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"fon=
t-size:11.0pt">BJ8 Registry</span></font></p>
<p class=3D"x_MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"fon=
t-size:11.0pt">AHCA Delegate at Large</span></font></p>
<p class=3D"x_MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"fon=
t-size:11.0pt">&nbsp;</span></font></p>
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<p class=3D"x_MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=
=3D"font-size:11.0pt; font-family:&quot;Calibri&quot;,sans-serif; font-weig=
ht:bold">From:</span></font></b><font size=3D"2" face=3D"Calibri"><span sty=
le=3D"font-size:11.0pt; font-family:&quot;Calibri&quot;,sans-serif">
 Healeys &lt;[email-masked]&gt; <b><span style=3D"font-weig=
ht:bold">On Behalf
<span class=3D"x_GramE">Of</span> </span></b>Simon Lachlan via Healeys<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> Saturday, October 11, =
2025 11:32 AM<br>
<b><span style=3D"font-weight:bold">To:</span></b> 'Healeys' &lt;healeys@au=
tox.team.net&gt;<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> [Healeys] Radiator =
cap with expansion tank.</span></font></p>
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</div>
<p class=3D"x_MsoNormal"><font size=3D"3" face=3D"Aptos"><span style=3D"fon=
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<p><font size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"font-size:=
12.0pt">Forgive another stupid question but it=92s sensible to be sure=85=
=85=85.</span></font></p>
<p><font size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"font-size:=
12.0pt">Am I right in assuming(!) that, if one fits an expansion tank, the =
standard cap is moved from the radiator to the expansion tank and is replac=
ed by a blanking(?) cap ie one which has
 no spring, no means of relief etcetc? Seem logical to me but logic has let=
 me down before.</span></font></p>
<p><font size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"font-size:=
12.0pt">Simon</span></font></p>
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[email-masked]

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