[Healeys] Overdrive Question

Sun Nov 6 10:38:04 MST 2016

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:

> Team.
>
> I can agree that a good goo between the mating faces is important and the
> Japanese Motorcycle manufacturers will probably have the solution nailed.
> The root cause however isn’t necessarily pressure, flange flatness, or goo
> failure.
>
> It is more likely that the rear reaction strut (not sure what else to call
> it) causes the joint to flex a little and open every time the car slows
> under braking.  My theory and the solution I adopted can be found here:
>
> http://www.bluehealey.com/Struts.html
>
> No leaks from my gearbox.
>
>
>
> AlanB
>
> [image: cid:image001.png at 01D18856.FC90FB60]
>
>
>
>
>
> *From:* Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf Of *Roger
> Grace
> *Sent:* 05 November 2016 21:02
> *To:* David Porter; Healey List
>
> *Subject:* Re: [Healeys] Overdrive Question
>
>
>
> Sorry to reopen this, but have this same leak in my BJ8 OD and fixing it
> is one of my Winter projects.
>
> Given that the black sealant stuff that was used before didn’t last (have
> no idea how long ago or what it is) and that there is no oil pressure on
> the joint, am sensitive to using what is the appropriate goo that will last
> and contain the oil.
>
> Have done some checking around and the Hylomar universal blue is used by
> some shops that fix OD’s.
>
> Overdrive Services (ex Laycock people in UK) tell me that the originals
> were sealed with a product called Wellseal.
>
> Nowadays they use a Wurth sealant that mentions flange mating in its
> website blurb.
>
> BTW they said that they could supply me with a gasket for this joint that
> seems like a good idea ?
>
>
>
> The reality is that these are 2 Al flanges that are mated without a
> gasket. I wonder why ?. Plan to do some careful flatness checking when have
> my hands on them.  Has anyone had a problem with the mating flatness ?  do
> they have a tendency to warp over the years and maybe abuse too ? given the
> shape not easy to machine flat - why do they leak ?
>
>
>
> Comments/ideas please.
>
> rg
>
>
>
>
>
> *From:* David Porter
>
> *Sent:* Wednesday, October 26, 2016 7:15 AM
>
> *To:* Bob Spidell ; John Spaur
>
> *Cc:* healeys
>
> *Subject:* Re: [Healeys] Overdrive Question
>
>
>
> seems like any RTV that is oil compliant will work. There is no internal
> pressure that will force oil out. The oil level in the OD is just above the
> operating shaft level, hence the need for the o-rings on the shaft.
>
> DaveP adding to the wisdom....
>
>
>
> On 10/26/2016 7:40 AM, Bob Spidell wrote:
>
> Soooooooo ... both types of Hylomar WILL seal the joint?
>
>
>
>
> ------------------------------
>
> *From: *"John Spaur" mailto:jmsdarch at sbcglobal.net
> <jmsdarch at sbcglobal.net>
> *To: *"WILLIAM B LAWRENCE" mailto:YNOTINK at msn.com <YNOTINK at msn.com>,
> "healeys" mailto:healeys at autox.team.net <healeys at autox.team.net>
> *Sent: *Tuesday, October 25, 2016 8:27:53 PM
> *Subject: *Re: [Healeys] Overdrive Question
>
>
>
> In my experiences neither of the two types Hylomar will not seal that
> joint.
>
>
>
> John Spaur
>
> San Jose
>
>
>
> *From:* Healeys [mailto:healeys-bounces at autox.team.net
> <healeys-bounces at autox.team.net>] *On Behalf Of *WILLIAM B LAWRENCE
> *Sent:* Sunday, October 23, 2016 8:26 PM
> *To:* healeys at autox.team.net
> *Subject:* [Healeys] Overdrive Question
>
>
>
> …disassembly of the OD because it is seeping oil at the clutch ring.
> There are no gaskets, but I would like to smear some Hylomar on the joint
> faces to stop the leak.
>
>
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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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-- 
*If you can't fix it with a hammer, you've got an electrical problem.*
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