[Healeys] Rear axle gasket question

David Porter frogeye at porterscustom.com
Mon Jan 26 16:32:24 MST 2015 

..the plot thickens...

On 1/26/2015 4:26 PM, Wilko2 wrote:
> My BN6 has no O-ring, and the BMC workshop manual doesn't show one.
>
>
>
> On Jan 26, 2015, at 3:19 PM, John Rowe wrote:
>
>> I am thinking that would BMC engineering in those days be so 
>> sophisticated that they would be worried about .004” to .010”. 
>> Judging from what I have seen over the years, I doubt it. IIRC, I 
>> used a grey silicone as a sealer- works ok for me.
>> John Rowe
>> Qld Australia
>> BN1 BT7
>> *From:*Healeys [mailto:healeys-bounces at autox.team.net]*On Behalf 
>> Of*Michael Salter
>> *Sent:*Tuesday, 27 January 2015 7:46 AM
>> *To:*Steve B. Gerow
>> *Cc:*healeys at autox.team.net <mailto:healeys at autox.team.net>
>> *Subject:*Re: [Healeys] Rear axle gasket question
>> Well you may be over thinking it but you are at least keeping us 
>> amused :-)
>> BTW the BN1, BN2 and 100S didn't have the "O" ring seal so I think in 
>> their cases the gasket was the seal..
>> Pooffff goes that theory..
>> Michael S
>> BN1 #174
>> On Mon, Jan 26, 2015 at 4:36 PM, Steve B. Gerow 
>> <steveg at abrazosdata.com <mailto:steveg at abrazosdata.com>> wrote:
>> The whole idea of the gasket-as-shim has a certain logic to it - 
>> except the o-ring does the actual sealing, correct?
>>
>> Is this the idea: when we tighten the lug nuts, we compress the 
>> gasket from, say .014" to .010". At .010, the axle center makes 
>> contact with the spacer ring and bearing, coming to a stop. There is 
>> then .010" between the carrier and axle flange. The gasket takes up 
>> the slack - is the compressed gasket strong enough to in effect be a 
>> shim between these two parts?
>>
>> Michael - maybe when extra-tightening of the lug nuts, the axle 
>> flange is also bending slightly to take up this gap.
>>
>> Betcha I'm over-thinking this! :-)
>>
>>
>>
>> --
>> Steve Gerow
>>
>>
>>
>> >  -------Original Message-------
>> >  From: Michael Salter <michaelsalter at gmail.com 
>> <mailto:michaelsalter at gmail.com>>
>> >  To: Steve B. Gerow <steveg at abrazosdata.com 
>> <mailto:steveg at abrazosdata.com>>
>> >  Cc:warthodson at aol.com 
>> <mailto:warthodson at aol.com><warthodson at aol.com 
>> <mailto:warthodson at aol.com>>,simon.lachlan at homecall.co.uk 
>> <mailto:simon.lachlan at homecall.co.uk>,healeys at autox.team.net 
>> <mailto:healeys at autox.team.net>
>> >  Subject: Re: [Healeys] Rear axle gasket question
>> >  Sent: Jan 26 '15 11:28
>> >
>> >  One other observation on this subject.
>> >
>> >
>> >  This is, I believe, the only place on a Healey where 'conical" 
>> seat nuts
>> >  are used.
>> >  It has been my experience that conical seat nuts always require 
>> re-torquing
>> >  after a little  use. Just like the lug nuts on your every day 
>> driver if
>> >  you torque them up, then drive the car for a bit you will find 
>> that the
>> >  nuts will take up to half a turn just to restore them to the original
>> >  torque.
>> >
>> >
>> >  That said however I do have to agree with Chris regarding 
>> aggressive use.
>> >  On AHX12 we found it necessary to re-torque those nuts after every 
>> day of
>> >  competition and they would always go on an additional flat or so.. 
>> I always
>> >  wondered where that extra tightening room came from because after 
>> a week of
>> >  Targa Newfoundland we would have tightened the nuts at least one 
>> full turn
>> >  ... that's 0.055".
>> >
>> >
>> >  I "forgot" to mention to co-driver Michael O that a likely cause was
>> >  stretching of the studs..:-).
>> >
>> >
>> >  Michael S
>> >  [LINK:http://www.acmefluid.com.au/larry/ahx12.html]
>> > http://www.acmefluid.com.au/larry/ahx12.html
>> >
>> >
>> >  On Mon, Jan 26, 2015 at 12:25 PM, Steve B. Gerow <[LINK:
>> >  mailto:steveg at abrazosdata.com 
>> <mailto:steveg at abrazosdata.com>]steveg at abrazosdata.com 
>> <mailto:steveg at abrazosdata.com>> wrote:
>> >  Some observations:
>> >  New Moss gasket - .014"
>> >  Old gasket originally coated with Hylomar, as removed from axle - 
>> .010"
>> >
>> >  .004" = copier paper
>> >
>> >  My axle is buttoned up with a new gasket and the rear 
>> rotor/caliper back
>> >  in place or I'd try to do a science project here.
>> >
>> >  For a gasket thickness, perhaps if one were to bolt the assembly 
>> together
>> >  without gasket and measure the gap with shims, then add .003" to that.
>> >
>> >  The new bearing, assembled with heat and cold per Tom Monaco's
>> >  instructions, is a tight fit in the carrier and axle - IIRC the 
>> bearing
>> >  depends on this more than the compression of the spacer, gasket, etc.
>> >
>> >
>> >  --
>> >  Steve Gerow
>> >  Altadena, CA
>> >  BN6
>> >
>> >
>> >  >  -------Original Message-------
>> >  >  From: [LINK: mailto:warthodson at aol.com 
>> <mailto:warthodson at aol.com>]warthodson at aol.com 
>> <mailto:warthodson at aol.com>
>> >  >  To: [LINK: mailto:simon.lachlan at homecall.co.uk 
>> <mailto:simon.lachlan at homecall.co.uk>]
>> > simon.lachlan at homecall.co.uk <mailto:simon.lachlan at homecall.co.uk>, 
>> [LINK: mailto:steveg at abrazosdata.com <mailto:steveg at abrazosdata.com>]
>> > steveg at abrazosdata.com <mailto:steveg at abrazosdata.com>, [LINK: 
>> mailto:healeys at autox.team.net <mailto:healeys at autox.team.net>]
>> > healeys at autox.team.net <mailto:healeys at autox.team.net>
>> >  >  Subject: Re: [Healeys] Rear axle gasket question
>> >  >  Sent: Jan 26 '15 08:41
>> >  >
>> >  >  I have not tried it but I doubt it. On the three axles I have 
>> actual
>> >  >  experience with the gasket needed to be Approx. 0.004" thick so 
>> that
>> >  the
>> >  >  spacer met the specified tolerances in the workshop manual. The
>> >  gaskets I
>> >  >  purchased were all approx. 0.010" thick. That would be a lot of
>> >  squish. You
>> >  >  would have to squish it without the bearing spacer in place. Then
>> >  remove
>> >  >  the axle & measure how much the spacer stood proud of the 
>> gasket. Then
>> >  >  reassemble everything, if it met spec. It seemed easier to just 
>> make a
>> >  >  gasket of the proper thickness.
>> >  >
>> >  >  Gary Hodson
>> >  >
>> >  >
>> >  >  From: Simon Lachlan <[LINK: mailto:simon.lachlan at homecall.co.uk 
>> <mailto:simon.lachlan at homecall.co.uk>]
>> > simon.lachlan at homecall.co.uk <mailto:simon.lachlan at homecall.co.uk>>
>> >  >  Subject: RE: [Healeys] Rear axle gasket question
>> >  >
>> >  >
>> >  >  If you soaked the too big gaskets in, say, WD40, wouldn’t they
>> >  compress
>> >  >  down to a proper size as you tightened up?
>> >  >
>> >  >  Just a thought..............
>> >  >
>> >  >  Simon
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>> >
>> >  --
>> >
>> >
>> >  If you can't fix it with a hammer, you've got an electrical problem.
>>
>>
>>
>> --
>>
>> /If you can't fix it with a hammer, you've got an electrical problem./
>>
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-- 
Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM 
87107 505-352-1378 Go HERE: my world www.porterbikes.com/
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