[Healeys] Overdrive Question

Fri Oct 28 05:09:22 MDT 2016

Hi all
I'm with Mike Salter 
There is also a similar "top hat" breather on the top of your diff banjo. It screws in. 
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? 
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. 
Anyway - mostly - the engine oil blow by is hiding it! :-)
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. 
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. 
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 Head. But I found my glasses tonight. So I'm back in the game Mike! ;-)

Sent from my iPhone

> On 28 Oct. 2016, at 7:56 pm, John Harper <ah100register at 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 oil would boil.
> 
> Best regards
> 
>> On 27 October 2016 at 22:32, Michael Salter <michaelsalter at 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...
>> 
>> 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. 
>> All Healey overdrives have this vent (or breather) on a BJ8 its part number is 17H5825
>> Just sayin'.
>> Michael S
>> BN1 #174
>> 
>> 
>>> On Wed, Oct 26, 2016 at 10:34 AM, Tim Davis BN7 <tld6008 at mchsi.com> wrote:
>>> no.... Neither of the two types will not seal that joint.....jeeez <undefined>
>>> 
>>> 
>>> From: "Bob Spidell" <bspidell at comcast.net>
>>> To: "John Spaur" <jmsdarch at sbcglobal.net>
>>> Cc: "healeys" <healeys at autox.team.net>
>>> Sent: Wednesday, October 26, 2016 8:40:33 AM
>>> Subject: Re: [Healeys] Overdrive Question
>>> 
>>> Soooooooo ... both types of Hylomar WILL seal the joint?
>>> 
>>> 
>>> From: "John Spaur" <jmsdarch at sbcglobal.net>
>>> To: "WILLIAM B LAWRENCE" <YNOTINK at msn.com>, "healeys" <healeys at autox.team.net>
>>> 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
>>> 
>>>  
>>> 
>>> From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of WILLIAM B LAWRENCE
>>> Sent: Sunday, October 23, 2016 8:26 PM
>>> To: healeys at autox.team.net
>>> Subject: [Healeys] Overdrive Question
>>> 
>>>  
>>> 
>>> …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.
>>> 
>>> 
>>> _______________________________________________
>>> 
>>> 
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>> 
>> 
>> 
>> -- 
>> If you can't fix it with a hammer, you've got an electrical problem.
>> 
>> 
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> 
> 
> 
> -- 
> Best wishes
> 
> John Harper
> 
> AHC UK 100 Register Secretary
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