[Healeys] Overdrive Question

[Michael Salter]

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> 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> 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>
> wrote:
> >
>



-- 
*If you can't fix it with a hammer, you've got an electrical problem.*
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/healeys/attachments/20161106/4b6a92f7/attachment.html>