[Healeys] Overdrive Question

Tue Nov 8 09:04:24 MST 2016

Tks to all for good input.
Wondering if anyone has thoughts why factory never installed a gasket at this flange joint ?
Any negatives about retro-fitting one after 50 years ?
rg

From: Michael Salter 
Sent: Sunday, November 6, 2016 9:38 AM
To: Healey List 
Subject: Re: [Healeys] Overdrive Question

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

  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
    To: "WILLIAM B LAWRENCE" mailto:YNOTINK at msn.com, "healeys" mailto: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] 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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