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<p>If the oil in your transmission is boiling you have bigger problems than an oil leak, but not for long...</p>
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<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. You may have a problem if the orifice is blocked or if it is too small, but for normal use I can't imagine that being
the case. I suppose the breather may be located in the wrong place and allowing pressure to build in some inaccessible places. </p>
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<p>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 Healey I always plan to use a bridge or ferry for water crossings.</p>
<p><br>
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<p>Bill Lawrence</p>
<p>BN1#554</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Healeys <healeys-bounces@autox.team.net> on behalf of Chris Dimmock <austin.healey@gmail.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>
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<div>Hi all</div>
<div id="AppleMailSignature">I'm with Mike Salter </div>
<div id="AppleMailSignature">There is also a similar "top hat" breather on the top of your diff banjo. It screws in. </div>
<div id="AppleMailSignature">Hands up if you've taken either off and cleaned 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="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 really hot. Or if it's parked. </div>
<div id="AppleMailSignature">Anyway - mostly - the engine oil blow by is hiding it! :-)</div>
<div id="AppleMailSignature">The cleaning of breathers - engine - diff - gearbox - was probably a standard procedure on a hoist in a BMC service back when the cars were new. </div>
<div id="AppleMailSignature">Most people who drive their cars a bit harder or raced them have also probably already replaced their "top hat" breather with a clear tube. Gearbox and Diff. Especially diff. To increase the ability to breathe (bigger air escape
area than the top hat lid arrangement), and to also route the clear plastic tube vertically to breathe cleaner air. </div>
<div id="AppleMailSignature">Hope this isn't too non tech </div>
<div id="AppleMailSignature">Keep you roof down, your revs up, and your sense of humor </div>
<div id="AppleMailSignature">Chris</div>
<div id="AppleMailSignature">P.S. I still can't find Mike Salter's 1st motion shafts. My spare Healey Head. But I found my glasses tonight. So I'm back in the game Mike! ;-)</div>
<div id="AppleMailSignature"><br>
Sent from my iPhone</div>
<div><br>
On 28 Oct. 2016, at 7:56 pm, John Harper <<a href="mailto:ah100register@gmail.com">ah100register@gmail.com</a>> wrote:<br>
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<div dir="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 claim that gearbox oil would boil.
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<div>Best regards</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 27 October 2016 at 22:32, Michael Salter <span dir="ltr">
<<a href="mailto:michaelsalter@gmail.com" target="_blank">michaelsalter@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div class="gmail_default" style="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".
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<div class="gmail_default" style="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>
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<div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:small">
Well they are and here is how...<br>
<img alt="Inline image 1" width="471" height="353" src="cid:ii_1580809924537b1e"><br>
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<div class="gmail_default" style="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 unit, in this case a 32% and, as the gearbox and overdrive units share a common oil reservoir this vent serves them both.
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<div class="gmail_default" style="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>
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<div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:small">
Just sayin'.<br>
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<div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:small">
Michael S<br>
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<div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:small">
BN1 #174<br>
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<div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:small">
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Oct 26, 2016 at 10:34 AM, Tim Davis BN7 <span dir="ltr">
<<a href="mailto:tld6008@mchsi.com" target="_blank">tld6008@mchsi.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>no.... Neither of the two types will not seal that joint.....jeeez <undefined><br>
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<b>From: </b>"Bob Spidell" <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>><br>
<b>To: </b>"John Spaur" <<a href="mailto:jmsdarch@sbcglobal.net" target="_blank">jmsdarch@sbcglobal.net</a>><br>
<b>Cc: </b>"healeys" <<a href="mailto:healeys@autox.team.net" target="_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>
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<div style="font-family:Arial;font-size:12pt;color:#000000">
<div>Soooooooo ... both types of Hylomar WILL seal the joint?</div>
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<div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt">
<b>From: </b>"John Spaur" <<a href="mailto:jmsdarch@sbcglobal.net" target="_blank">jmsdarch@sbcglobal.net</a>><br>
<b>To: </b>"WILLIAM B LAWRENCE" <<a href="mailto:YNOTINK@msn.com" target="_blank">YNOTINK@msn.com</a>>, "healeys" <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>><br>
<b>Sent: </b>Tuesday, October 25, 2016 8:27:53 PM<br>
<b>Subject: </b>Re: [Healeys] Overdrive Question<br>
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</div>
<div class="m_-8864914400215861518m_6296156294276310179WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">In my experiences neither of the two types Hylomar will not seal that joint.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">John Spaur</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">San Jose</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Healeys [mailto:<a href="mailto:healeys-bounces@autox.team.net" target="_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="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a><br>
<b>Subject:</b> [Healeys] Overdrive Question</span></p>
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<p class="MsoNormal"> </p>
<div id="m_-8864914400215861518m_6296156294276310179divtagdefaultwrapper">
<p><span style="font-family:"Calibri",sans-serif;color:#1f497d">…</span><span style="font-family:"Calibri",sans-serif;color:black">disassembly of the OD because it is seeping oil at the clutch ring. There are no gaskets, but I would like to smear some Hylomar
on the joint faces to stop the leak. </span></p>
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<br>
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<div dir="ltr">
<div>
<div dir="ltr"><i><font size="2"><span style="color:black">If you can't fix it with a hammer, you've got an electrical problem.</span></font></i><br>
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<div dir="ltr">Best wishes
<div><br>
</div>
<div>John Harper</div>
<div><br>
</div>
<div>AHC UK 100 Register Secretary</div>
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