--===============2694826443758483953==
--0000000000002696f905db65e92b
Content-Transfer-Encoding: quoted-printable
Hi Bob -
the Robertshaw thermostats are nicely made, but they open the wrong way
around... let me do some measurements as I am dealing with the cooling on
my BJ8 now. I have a robert shaw... as well as another sleeved thermostat
as well as the bellows.
Best,
Alan
On Wed, Mar 30, 2022 at 9:54 AM Bob Spidell <bspidell@comcast.net> wrote:
> Years ago, someone--might have been BCS, but I'm not sure--was selling a
> Robertshaw thermostat with a brass sleeve soldered to it (Robertshaw
> thermostats have a center portion that moves up and down). The one I boug=
ht
> was 160deg; I desoldered the sleeve and soldered it to a 180deg Robertsha=
w.
> I bought one of the original, bellows-type from Kees--whatever happened t=
o
> him?--but never installed it; heard they were the 'fail closed' type, whi=
ch
> could turn a minor failure into a catastrophe (still have it around
> somewhere).
>
>
> https://flowkoolerwaterpumps.com/products/robertshaw-330-160-degree-therm=
ostat
>
>
> On 3/29/2022 6:35 PM, Alan Seigrist via Healeys wrote:
>
> Harold -
>
> Thank you, now I understand how the whole thing is supposed to work. The
> sleeve works to cut off the bypass so that hot water is not recycled into
> the system after it warms up. FWIW, this only applies to the 6 cyl, the =
4
> cyl doesn't have any sort of bypass.
>
> Yes, I think it would be great if you could share with us which thermosta=
t
> to purchase and how to modify it.
>
> Best,
>
> Alan
>
> On Wed, Mar 30, 2022 at 1:28 AM Harold Manifold via Healeys <
> healeys@autox.team.net> wrote:
>
>> The coolant bypass plays an important but problematic role in the
>> Healey=E2=80=99s cooling system. When the thermostat is closed coolant r=
eturns to
>> the water pump via the bypass. See the red circle on the attached pictur=
e.
>> The bypass is important for three reasons: its allows the coolant in the
>> block to continue to circulate and come to a uniform temperature before =
the
>> thermostat opens, it prevents hot spots that could develop from stagnant
>> coolant and it prevents the water pump from dead heading.
>>
>>
>>
>> The problematic part is in the original design the bypass was closed by =
a
>> sleeve on the bellows type thermostat when the thermostat opened. The
>> original Bellows type thermostat used a volatile liquid and were not
>> reliable and were not suitable for the 7 psi cooling system pressure. Wa=
x
>> type thermostats are much more reliable but they do not have a sleeve to
>> close off the bypass. There may be some expensive wax type replicas of t=
he
>> original bellows type.
>>
>>
>>
>> After looking at many options the best option for a reasonably priced wa=
x
>> type thermostat with a sleeve to close off the bay pass is the modified
>> Land Rover Series ll thermostat. If anyone would like to know about
>> modifying the Landver thermostat let me know. It can be easily done.
>>
>>
>>
>> Harold
>>
>>
>>
>> *From: *Michael Salter via Healeys <healeys@autox.team.net>
>> *Sent: *Tuesday, March 29, 2022 9:17 AM
>> *To: *Healey list <Healeys@autox.team.net>
>> *Subject: *Re: [Healeys] Coolant bypass port in the head - 6-cyl
>>
>>
>>
>> The coolant travels from the bottom of the radiator to the water pump
>> into the block then from the block into the head then through the
>> thermostat to the top of the radiator.
>>
>>
>>
>> M
>>
>>
>>
>> On Tue., Mar. 29, 2022, 11:57 a.m. Elton S, <eps2660@gmail.com> wrote:
>>
>> As a related question, what is the direction of flow through the radiato=
r
>> - up from the bottom or down from the top?
>>
>> Elton
>>
>> BJ7
>>
>>
>>
>> On Tue, Mar 29, 2022 at 11:44 AM Michael Salter <michaelsalter@gmail.com=
>
>> wrote:
>>
>> As Gary points out, and far as I have been able to figure out, the bypas=
s
>> passage is open when the engine is cold, the idea being that by "short
>> circuiting" the radiator the coolant in the heater and bypass passage wi=
ll
>> warm up more quickly and the heater will produce heat more quickly.
>>
>> We had a slew of the "shrouded " type thermostats that I bought when
>> Smiths Canada closed down. The part number was 43570/28 and we used to s=
ell
>> them to customers who reported overheating problems.
>>
>> I stopped promoting them as a potential solution to overheating issues
>> after being taken to task by a customer who did an extensive study of th=
e
>> issue and proved, at least to my satisfaction, that they improved cooli=
ng
>> not one iota.
>>
>>
>>
>> M
>>
>>
>>
>> On Tue., Mar. 29, 2022, 10:47 a.m. Alan Seigrist, <healey.nut@gmail.com>
>> wrote:
>>
>> I don't know if this has ever been answered before, but where does the
>> little bypass port begin?
>>
>>
>>
>> What parts of the head does that bypass come in contact with?
>>
>> When do you want to cover the port with a sleeve (when coolant is hot or
>> cold?)
>>
>>
>>
>> I ask because the old bellows style thermostat will cover the bypass por=
t
>> when the thermostat opens
>>
>> then I have another wax thermostat and the sleeve actually cover the
>> bypass when it is cold, and doesn't cover it when the thermostat opens..=
..
>> so it works exact opposite to the old bellows style thermostat.
>>
>>
>>
>> confused....
>>
>> Cheers,
>>
>>
>>
>> Alan
>>
>> _______________________________________________
>> Support Team.Net http://www.team.net/donate.html
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--0000000000002696f905db65e92b
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">Hi Bob -<div><br></div><div>the Robertshaw thermostats are=
nicely made, but they open the wrong way around... let me do some measurem=
ents as I am dealing with the cooling on my BJ8 now.=C2=A0 I have a robert =
shaw... as well as another sleeved thermostat as well as the bellows.</div>=
<div><br></div><div>Best,</div><div><br></div><div>Alan</div></div><br><div=
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Mar 30=
, 2022 at 9:54 AM Bob Spidell <<a href=3D"mailto:bspidell@comcast.net";>b=
spidell@comcast.net</a>> wrote:<br></div><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex">
=20
=20
=20
<div>
Years ago, someone--might have been BCS, but I'm not sure--was
selling a Robertshaw thermostat with a brass sleeve soldered to it
(Robertshaw thermostats have a center portion that moves up and
down). The one I bought was 160deg; I desoldered the sleeve and
soldered it to a 180deg Robertshaw. I bought one of the original,
bellows-type from Kees--whatever happened to him?--but never
installed it; heard they were the 'fail closed' type, which cou=
ld
turn a minor failure into a catastrophe (still have it around
somewhere).<br>
<br>
<a href=3D"https://flowkoolerwaterpumps.com/products/robertshaw-330-160-deg=
ree-thermostat" target=3D"_blank">https://flowkoolerwaterpumps.com/products=
/robertshaw-330-160-degree-thermostat</a><br>
<br>
<br>
<div>On 3/29/2022 6:35 PM, Alan Seigrist via
Healeys wrote:<br>
</div>
<blockquote type=3D"cite">
=20
<div dir=3D"ltr">Harold -
<div><br>
</div>
<div>Thank you, now I understand how the whole thing is supposed
to work.=C2=A0 The sleeve works to cut off the bypass so that hot
water is not recycled into the system after it warms up.=C2=A0
FWIW, this only applies to the 6 cyl, the 4 cyl doesn't have
any sort of bypass.<br>
<br>
Yes, I think it would be great if you could share with us
which thermostat to purchase and how to modify it.</div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Alan</div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Wed, Mar 30, 2022 at 1:28
AM Harold Manifold via Healeys <<a href=3D"mailto:healeys@auto=
x.team.net" target=3D"_blank">healeys@autox.team.net</a>>
wrote:<br>
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal">The coolant bypass plays an important
but problematic role in the Healey=E2=80=99s cooling system=
.
When the thermostat is closed coolant returns to the
water pump via the bypass. See the red circle on the
attached picture. The bypass is important for three
reasons: its allows the coolant in the block to continue
to circulate and come to a uniform temperature before
the thermostat opens, it prevents hot spots that could
develop from stagnant coolant and it prevents the water
pump from dead heading.</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">The problematic part is in the
original design the bypass was closed by a sleeve on the
bellows type thermostat when the thermostat opened. The
original Bellows type thermostat used a volatile liquid
and were not reliable and were not suitable for the 7
psi cooling system pressure. Wax type thermostats are
much more reliable but they do not have a sleeve to
close off the bypass. There may be some expensive wax
type replicas of the original bellows type.</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">After looking at many options the
best option for a reasonably priced wax type thermostat
with a sleeve to close off the bay pass is the modified
Land Rover Series ll thermostat. If anyone would like to
know about modifying the Landver thermostat let me know.
It can be easily done.</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">Harold</p>
<p class=3D"MsoNormal">=C2=A0</p>
<div style=3D"border-right:none;border-bottom:none;border-lef=
t:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class=3D"MsoNormal" style=3D"border:none;padding:0in"><b=
>From:
</b><a href=3D"mailto:healeys@autox.team.net"; target=3D"_=
blank">Michael
Salter via Healeys</a><br>
<b>Sent: </b>Tuesday, March 29, 2022 9:17 AM<br>
<b>To: </b><a href=3D"mailto:Healeys@autox.team.net"; targ=
et=3D"_blank">Healey list</a><br>
<b>Subject: </b>Re: [Healeys] Coolant bypass port in
the head - 6-cyl</p>
</div>
<p class=3D"MsoNormal">=C2=A0</p>
<div>
<p class=3D"MsoNormal">The coolant travels from the bottom
of the radiator to the water pump into the block then
from the block into the head then through the
thermostat to the top of the radiator.</p>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">M</p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0</p>
<div>
<div>
<p class=3D"MsoNormal">On Tue., Mar. 29, 2022, 11:57
a.m. Elton S, <<a href=3D"mailto:eps2660@gmail.com"; =
target=3D"_blank">eps2660@gmail.com</a>>
wrote:</p>
</div>
<blockquote style=3D"border-top:none;border-right:none;bord=
er-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6=
pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class=3D"MsoNormal">As a related question, what is
the direction of flow through the radiator - up
from the bottom or down from the top?</p>
<div>
<p class=3D"MsoNormal">Elton=C2=A0=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">BJ7</p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0</p>
<div>
<div>
<p class=3D"MsoNormal">On Tue, Mar 29, 2022 at 11:44
AM Michael Salter <<a href=3D"mailto:michaelsalt=
er@gmail.com" target=3D"_blank">michaelsalter@gmail.com</a>>
wrote:</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 0=
in 6pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class=3D"MsoNormal">As Gary points out, and far
as I have been able to figure out, the bypass
passage is open when the engine is cold, the
idea being that by "short circuiting" t=
he
radiator the coolant in the heater and bypass
passage will warm up more quickly and the
heater will produce heat more quickly.=C2=A0</p>
<div>
<p class=3D"MsoNormal">We had a slew of the
"shrouded " type thermostats that I b=
ought
when Smiths Canada closed down. The part
number was 43570/28 and we used to sell them
to customers who reported overheating
problems.=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">I stopped promoting them
as a potential solution to overheating
issues after being taken to task by a
customer who did an extensive study of the
issue and proved, at least to my
satisfaction,=C2=A0 that they improved cooling
not one iota.</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">M</p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0</p>
<div>
<div>
<p class=3D"MsoNormal">On Tue., Mar. 29, 2022,
10:47 a.m. Alan Seigrist, <<a href=3D"mailto=
:healey.nut@gmail.com" target=3D"_blank">healey.nut@gmail.com</a>>
wrote:</p>
</div>
<blockquote style=3D"border-top:none;border-right:n=
one;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0=
in 0in 6pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class=3D"MsoNormal">I don't know if this
has ever been answered before, but where
does the little bypass port begin?=C2=A0 =C2=
=A0</p>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">What parts of the
head does that bypass come in contact
with?=C2=A0<br>
<br>
When do you want to cover the port with
a sleeve (when coolant is hot or cold?)</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">I ask because the old
bellows style thermostat will cover the
bypass port when the thermostat opens<br>
<br>
then I have another wax thermostat and
the sleeve actually cover the bypass
when it is cold, and doesn't cover it
when the thermostat opens.... so it
works exact opposite to the old bellows
style thermostat.</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">confused....<br>
<br>
Cheers,</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">Alan</p>
</div>
</div>
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