[Healeys] Overdrive Question

[Jean Caron]

I have used sealant as well, just rebuilt an overdrive last week and used sealant, will it make a difference, not so sure about that, but I have long accepted the fact that Austin-Healey leak oil and I don't worry about it. Several years ago, a Club member proudly told me that his Healey no longer had any oil leaks and within a week the engine blew, was it related, not sure but what a coincidence.


Jean


________________________________
From: Healeys <healeys-bounces at autox.team.net> on behalf of David Porter <frogeye at porterscustom.com>
Sent: November 7, 2016 12:45 AM
To: Michael Salter; Austin Healeys List
Cc: Healey List
Subject: Re: [Healeys] Overdrive Question


I concur, but have on occasion used sealant. It's a PITA to get on both sides properly during assembly.. There can be some dissimilar metal corrosion after all this time passage.

DaveP


On 11/6/2016 2:22 PM, Michael Salter wrote:
Hi Andy,
The thing is that there is no mention of the use of any type of sealant on the clutch ring in any of the literature that I have on the overdrive units...
Hard to imagine but I have never seen evidence of any on the virgin units that I have disassembled... I think it was just a dry joint!!!
Michael S
BN1 #174

On Sun, Nov 6, 2016 at 4:06 PM, Austin Healeys List <austinhealeyslist at gmail.com<mailto:austinhealeyslist at gmail.com>> wrote:
HI Michael

It has nothing to do with the studs stretching and everything to do
with the aluminium housing flexing. It only needs to move a tiny bit
to unstick the sealant and after that there is no longer anything
stopping the oil weeping out. I'll run an FEA simulation on it some
time to show just how flexible the ali case is.

btw, Yamabond, Kawabond, Hondabond, Suzukibond etc are all OEM names
for ThreeBond sealant.

Andy.


On 11/7/16, Michael Salter <michaelsalter at gmail.com<mailto:michaelsalter at gmail.com>> wrote:
> Out of interest I just did the calculations for the change in length of the
> studs in this case.
> Assuming:
> 4 x 5/16" dia studs with an effective diameter of 0.25" each (thread root)
> and a length of 3" (in actual fact only the bottom pair are that long).
> 0.8 G of braking (which is probably way higher than our tires can generate)
> Young's Modulus of 30,000,000 @ 100 degrees F
> 700 lbs of engine and gearbox (which is probably very high considering that
> the the mounts are all rubber and the main engine mounts would absorb a
> fair bit as well)
> Works out to about 0.00028" of stretch.
> That's less than 10% of a human hair and only during panic braking if the
> tie rod is the only thing resisting the load.
> I think that there must be other contributing factors...
> Michael S
> BN1 #174
>
> On Sun, Nov 6, 2016 at 11:19 AM, Bluehealey <bluehealey at gmail.com<mailto:bluehealey at gmail.com>> wrote:
>



--
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/<http://www.porterbikes.com/>
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