[Healeys] Overdrive Question

[David Porter]

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/
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