[Healeys] Rear axle gasket question

Wilko2 e-wilkins at cox.net
Mon Jan 26 16:26:27 MST 2015 

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
> 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> 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>
> >  To: Steve B. Gerow <steveg at abrazosdata.com>
> >  Cc: warthodson at aol.com <warthodson at aol.com>, simon.lachlan at homecall.co.uk, 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] 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] warthodson at aol.com
> >  >  To: [LINK: mailto:simon.lachlan at homecall.co.uk]
> >  simon.lachlan at homecall.co.uk, [LINK: mailto:steveg at abrazosdata.com]
> >  steveg at abrazosdata.com, [LINK: mailto:healeys at autox.team.net]
> >  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]
> >  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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