[Healeys] Rear axle gasket question

Mon Jan 26 16:19:04 MST 2015

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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