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If the oil in your transmission is boiling you have bigger problems than an=
oil leak, but not for long...
The vent is there to allow the oil (and air) to expand as it warms up witho=
ut pressurizing the housing and to draw air back in as it cools. You may ha=
ve a problem if the orifice is blocked or if it is too small, but for norma=
l use I can't imagine that being the case. I suppose the breather may be lo=
cated in the wrong place and allowing pressure to build in some inaccessibl=
e places.
I've seen extended breathers on four wheel drive vehicles, but that is too =
keep from pulling water into the housing during fording operations. In my H=
ealey I always plan to use a bridge or ferry for water crossings.
Bill Lawrence
BN1#554
________________________________
From: Healeys <healeys-bounces@autox.team.net> on behalf of Chris Dimmock <=
austin.healey@gmail.com>
Sent: Friday, October 28, 2016 11:09:22 AM
To: John Harper
Cc: healeys
Subject: Re: [Healeys] Overdrive Question
Hi all
I'm with Mike Salter
There is also a similar "top hat" breather on the top of your diff banjo. I=
t screws in.
Hands up if you've taken either off and cleaned the crud out of these in th=
e past 50 - 60 years; or hands on your head if you're still having issues w=
ith leaking diff/ gearbox oil seals?
Of course there will be no oil by blow mist or "telltale" marks if the bre=
ather top hat is blocked and sealed with crud, or you aren't driving long d=
istances enough to get oil really hot. Or if it's parked.
Anyway - mostly - the engine oil blow by is hiding it! :-)
The cleaning of breathers - engine - diff - gearbox - was probably a standa=
rd procedure on a hoist in a BMC service back when the cars were new.
Most people who drive their cars a bit harder or raced them have also proba=
bly already replaced their "top hat" breather with a clear tube. Gearbox an=
d Diff. Especially diff. To increase the ability to breathe (bigger air esc=
ape area than the top hat lid arrangement), and to also route the clear pla=
stic tube vertically to breathe cleaner air.
Hope this isn't too non tech
Keep you roof down, your revs up, and your sense of humor
Chris
P.S. I still can't find Mike Salter's 1st motion shafts. My spare Healey He=
ad. But I found my glasses tonight. So I'm back in the game Mike! ;-)
Sent from my iPhone
100register@gmail.com>> wrote:
Mike - Just to add to this I have never seen oil 'blowing' out of this vent=
because if it did it would show. I don't believe the claim that gearbox oi=
l would boil.
Best regards
On 27 October 2016 at 22:32, Michael Salter <michaelsalter@gmail.com<mailto=
:michaelsalter@gmail.com>> wrote:
Somebody suggested that the reason that BN1 gearboxes leak is that they are=
not "vented".
I have been thinking about this as I was sure that they are vented..
Well they are and here is how...
[Inline image 1]
The above is the gearbox vent. It is located on the top of the overdrive un=
it, in this case a 32% and, as the gearbox and overdrive units share a comm=
on oil reservoir this vent serves them both.
All Healey overdrives have this vent (or breather) on a BJ8 its part number=
is 17H5825
Just sayin'.
Michael S
BN1 #174
ld6008@mchsi.com>> wrote:
no.... Neither of the two types will not seal that joint.....jeeez <undefin=
ed>
________________________________
Sent: Wednesday, October 26, 2016 8:40:33 AM
Subject: Re: [Healeys] Overdrive Question
Soooooooo ... both types of Hylomar WILL seal the joint?
________________________________
Sent: Tuesday, October 25, 2016 8:27:53 PM
Subject: Re: [Healeys] Overdrive Question
In my experiences neither of the two types Hylomar will not seal that joint=
.
John Spaur
San Jose
@autox.team.net>] On Behalf Of WILLIAM B LAWRENCE
Sent: Sunday, October 23, 2016 8:26 PM
Subject: [Healeys] Overdrive Question
=85disassembly of the OD because it is seeping oil at the clutch ring. Ther=
e are no gaskets, but I would like to smear some Hylomar on the joint faces=
to stop the leak.
_______________________________________________
_______________________________________________
Archive: http://www.team.net/archive
http://autox.team.net/mailman/listinfo/healeys
chsi.com
_______________________________________________
Archive: http://www.team.net/archive
http://autox.team.net/mailman/listinfo/healeys
lter@gmail.com
--
If you can't fix it with a hammer, you've got an electrical problem.
_______________________________________________
Archive: http://www.team.net/archive
http://autox.team.net/mailman/listinfo/healeys
ster@gmail.com
--
Best wishes
John Harper
AHC UK 100 Register Secretary
_______________________________________________
Archive: http://www.team.net/archive
http://autox.team.net/mailman/listinfo/healeys
aley@gmail.com
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
</head>
<body dir=3D"auto">
<style type=3D"text/css" style=3D"display:none;"><!-- P {margin-top:0;margi=
n-bottom:0;} --></style>
<div id=3D"divtagdefaultwrapper" style=3D"font-size:12pt;color:#000000;font=
-family:Calibri,Arial,Helvetica,sans-serif;">
<p>If the oil in your transmission is boiling you have bigger problems than=
an oil leak, but not for long...</p>
<p><br>
</p>
<p>The vent is there to allow the oil (and air) to expand as it warms =
up without pressurizing the housing and to draw air back in as it cools. Yo=
u may have a problem if the orifice is blocked or if it is too small, but f=
or normal use I can't imagine that being
the case. I suppose the breather may be located in the wrong place and all=
owing pressure to build in some inaccessible places. </p>
<p><br>
</p>
<p>I've seen extended breathers on four wheel drive vehicles, but that is t=
oo keep from pulling water into the housing during fording operations.=
In my Healey I always plan to use a bridge or ferry&nb=
sp;for water crossings.</p>
<p><br>
</p>
<p>Bill Lawrence</p>
<p>BN1#554</p>
</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 <healeys-b=
ounces@autox.team.net> on behalf of Chris Dimmock <austin.healey@gmai=
l.com><br>
<b>Sent:</b> Friday, October 28, 2016 11:09:22 AM<br>
<b>To:</b> John Harper<br>
<b>Cc:</b> healeys<br>
<b>Subject:</b> Re: [Healeys] Overdrive Question</font>
<div> </div>
</div>
<div>
<div><span></span></div>
<div>
<div>Hi all</div>
<div id=3D"AppleMailSignature">I'm with Mike Salter </div>
<div id=3D"AppleMailSignature">There is also a similar "top hat" =
breather on the top of your diff banjo. It screws in. </div>
<div id=3D"AppleMailSignature">Hands up if you've taken either off and clea=
ned the crud out of these in the past 50 - 60 years; or hands on your head =
if you're still having issues with leaking diff/ gearbox oil seals? </=
div>
<div id=3D"AppleMailSignature">Of course there will be no oil by blow mist =
or "telltale" marks if the breather top hat is blocked and =
sealed with crud, or you aren't driving long distances enough to get oil re=
ally hot. Or if it's parked. </div>
<div id=3D"AppleMailSignature">Anyway - mostly - the engine oil blow by is =
hiding it! :-)</div>
<div id=3D"AppleMailSignature">The cleaning of breathers - engine - diff - =
gearbox - was probably a standard procedure on a hoist in a BMC service bac=
k when the cars were new. </div>
<div id=3D"AppleMailSignature">Most people who drive their cars a bit harde=
r or raced them have also probably already replaced their "top hat&quo=
t; breather with a clear tube. Gearbox and Diff. Especially diff. To increa=
se the ability to breathe (bigger air escape
area than the top hat lid arrangement), and to also route the clear plasti=
c tube vertically to breathe cleaner air. </div>
<div id=3D"AppleMailSignature">Hope this isn't too non tech </div>
<div id=3D"AppleMailSignature">Keep you roof down, your revs up, and your s=
ense of humor </div>
<div id=3D"AppleMailSignature">Chris</div>
<div id=3D"AppleMailSignature">P.S. I still can't find Mike Salter's 1st mo=
tion shafts. My spare Healey Head. But I found my glasses tonight. So I'm b=
ack in the game Mike! ;-)</div>
<div id=3D"AppleMailSignature"><br>
Sent from my iPhone</div>
<div><br>
On 28 Oct. 2016, at 7:56 pm, John Harper <<a href=3D"mailto:ah100registe=
r@gmail.com">ah100register@gmail.com</a>> wrote:<br>
<br>
</div>
<blockquote type=3D"cite">
<div>
<div dir=3D"ltr">Mike - Just to add to this I have never seen oil 'blowing'=
out of this vent because if it did it would show. I don't believe the clai=
m that gearbox oil would boil.
<div><br>
</div>
<div>Best regards</div>
</div>
<div class=3D"gmail_extra"><br>
<div class=3D"gmail_quote">On 27 October 2016 at 22:32, Michael Salter <spa=
n dir=3D"ltr">
<<a href=3D"mailto:michaelsalter@gmail.com"; target=3D"_blank">michaelsal=
ter@gmail.com</a>></span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<div dir=3D"ltr">
<div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;=
font-size:small">
Somebody suggested that the reason that BN1 gearboxes leak is that they are=
not "vented".
<br>
</div>
<div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;=
font-size:small">
I have been thinking about this as I was sure that they are vented..<br>
</div>
<div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;=
font-size:small">
Well they are and here is how...<br>
<img alt=3D"Inline image 1" width=3D"471" height=3D"353" src=3D"cid:ii_1580=
809924537b1e"><br>
</div>
<div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;=
font-size:small">
The above is the gearbox vent. It is located on the top of the overdrive un=
it, in this case a 32% and, as the gearbox and overdrive units share a comm=
on oil reservoir this vent serves them both.
<br>
</div>
<div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;=
font-size:small">
All Healey overdrives have this vent (or breather) on a BJ8 its part number=
is 17H5825<br>
</div>
<div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;=
font-size:small">
Just sayin'.<br>
</div>
<div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;=
font-size:small">
Michael S<br>
</div>
<div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;=
font-size:small">
BN1 #174<br>
</div>
<div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;=
font-size:small">
<br>
</div>
</div>
<div class=3D"gmail_extra"><br>
<div class=3D"gmail_quote">On Wed, Oct 26, 2016 at 10:34 AM, Tim Davis BN7 =
<span dir=3D"ltr">
<<a href=3D"mailto:tld6008@mchsi.com"; target=3D"_blank">tld6008@mchsi.co=
m</a>></span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<div>
<div style=3D"font-family:Times New Roman;font-size:12pt;color:#000000">
<div>no.... Neither of the two types will not seal that joint.....jeeez <=
;undefined><br>
</div>
<div><br>
</div>
<div><br>
</div>
<hr id=3D"m_-8864914400215861518m_6296156294276310179zwchr">
<div style=3D"color:#000;font-weight:normal;font-style:normal;text-decorati=
on:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt">
<b>From: </b>"Bob Spidell" <<a href=3D"mailto:bspidell@comcast=
.net" target=3D"_blank">bspidell@comcast.net</a>><br>
<b>To: </b>"John Spaur" <<a href=3D"mailto:jmsdarch@sbcglobal.=
net" target=3D"_blank">jmsdarch@sbcglobal.net</a>><br>
<b>Cc: </b>"healeys" <<a href=3D"mailto:healeys@autox.team.net=
" target=3D"_blank">healeys@autox.team.net</a>><br>
<b>Sent: </b>Wednesday, October 26, 2016 8:40:33 AM<span><br>
<b>Subject: </b>Re: [Healeys] Overdrive Question<br>
<div><br>
</div>
<div style=3D"font-family:Arial;font-size:12pt;color:#000000">
<div>Soooooooo ... both types of Hylomar WILL seal the joint?</div>
<div><br>
</div>
<div><br>
</div>
<hr id=3D"m_-8864914400215861518m_6296156294276310179zwchr">
<div style=3D"color:#000;font-weight:normal;font-style:normal;text-decorati=
on:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt">
<b>From: </b>"John Spaur" <<a href=3D"mailto:jmsdarch@sbcgloba=
l.net" target=3D"_blank">jmsdarch@sbcglobal.net</a>><br>
<b>To: </b>"WILLIAM B LAWRENCE" <<a href=3D"mailto:YNOTINK@msn=
.com" target=3D"_blank">YNOTINK@msn.com</a>>, "healeys" <<a=
href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">healeys@autox.tea=
m.net</a>><br>
<b>Sent: </b>Tuesday, October 25, 2016 8:27:53 PM<br>
<b>Subject: </b>Re: [Healeys] Overdrive Question<br>
<div><br>
</div>
<div class=3D"m_-8864914400215861518m_6296156294276310179WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri",sans-serif;color:#1f497d">In my experiences neither of the two =
types Hylomar will not seal that joint.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri",sans-serif;color:#1f497d"> </span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri",sans-serif;color:#1f497d">John Spaur</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri",sans-serif;color:#1f497d">San Jose</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri",sans-serif;color:#1f497d"> </span></p>
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><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 [mailto:<a href=3D"mai=
lto:healeys-bounces@autox.team.net" target=3D"_blank">healeys-bounces@autox=
.<wbr>team.net</a>]
<b>On Behalf Of </b>WILLIAM B LAWRENCE<br>
<b>Sent:</b> Sunday, October 23, 2016 8:26 PM<br>
<b>To:</b> <a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">heal=
eys@autox.team.net</a><br>
<b>Subject:</b> [Healeys] Overdrive Question</span></p>
</div>
</div>
<p class=3D"MsoNormal"> </p>
<div id=3D"m_-8864914400215861518m_6296156294276310179divtagdefaultwrapper"=
>
<p><span style=3D"font-family:"Calibri",sans-serif;color:#1f497d"=
>=85</span><span style=3D"font-family:"Calibri",sans-serif;color:=
black">disassembly of the OD because it is seeping oil at the clu=
tch ring. There are no gaskets, but I would like to smear some Hylomar
on the joint faces to stop the leak. </span></p>
</div>
</div>
<br>
______________________________<wbr>_________________<br>
<div><br>
</div>
</div>
<div><br>
</div>
</div>
<br>
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</blockquote>
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<span class=3D"HOEnZb"><font color=3D"#888888"><br>
<br clear=3D"all">
<br>
-- <br>
<div class=3D"m_-8864914400215861518gmail_signature" data-smartmail=3D"gmai=
l_signature">
<div dir=3D"ltr">
<div>
<div dir=3D"ltr"><i><font size=3D"2"><span style=3D"color:black">If you can=
't fix it with a hammer, you've got an electrical problem.</span></font></i=
><br>
<br>
<div></div>
<div></div>
<div></div>
</div>
</div>
</div>
</div>
</font></span></div>
<br>
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</blockquote>
</div>
<br>
<br clear=3D"all">
<div><br>
</div>
-- <br>
<div class=3D"gmail_signature" data-smartmail=3D"gmail_signature">
<div dir=3D"ltr">Best wishes
<div><br>
</div>
<div>John Harper</div>
<div><br>
</div>
<div>AHC UK 100 Register Secretary</div>
</div>
</div>
</div>
</div>
</blockquote>
<blockquote type=3D"cite">
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