[Healeys] Overdrive Question

Sun Nov 6 08:01:39 MST 2016

Oddly I have not encountered many issues with oil leakage at the brake ring
joints, certainly no serious leaks. Although I can appreciate the logic
related the concept of the joint at the brake ring opening up "under
braking" as a consequence of the "structural" issues mentioned on the BN2
on gearboxes I very much doubt that the inertia of the engine and gearbox
when applied through the rubber bushes of the tie rod would be sufficient
to actually stretch the 2 lower studs (or perhaps more correctly pull the
threads out of the overdrive case) and distort the rear housing flange
containing the other 4 studs.
I should also add that this does not explain the leakage issues experienced
by Bill with his BN1 as the engine restraint (tie rod) on the BN1 is
located on the gearbox/overdrive adapter plate.
It is interesting that adding a sealant channel and using silicone sealant
resolved the problem for Andy but IMHO the real cause may not yet have been
identified.

Michael S
BN1 #174

On Sun, Nov 6, 2016 at 9:08 AM, David Porter <frogeye at porterscustom.com>
wrote:

>
>
> On 11/5/2016 8:03 PM, David Porter wrote:
>
> I use Yamabond. For sealing Al motorcycle engines. I like it. DaveP
>
> On 11/5/2016 3:01 PM, Roger Grace wrote:
>
> 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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>
> --
> 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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> --
> 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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> 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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