Gearbox gasketting

Torontonian · Aug 20, 2012

Left out gasket on outer cover( as suggested ?) using Permatex Ultimate Grey to both clean surfaces and she still leaks. Inner cover set fine. Have a new outer gasket to try again later after frustration level dies down. Will search for rear isolastic shims bag in the meantime. Permatex both sides of gasket this upcoming attempt ?

DogT · Aug 20, 2012

I've had good luck with silicone it to the cover, and then grease on the other side, then install. That way the gasket comes off with the cover and you can get the cover off without beating and re-use the gasket, sometimes.

Dave
69S

Torontonian · Aug 20, 2012

Thanks DogT ,the gasket I have new from Walridge is blue and waxy smooth unlike the old Norton one so will try without grease as it feels kinda greasy anyways new. I'll clean both surfaces again with brake cleaner spray and wipe clean with blue shoptowell before applying a thin coat of Hylomar Ultimate on both casings. What kind of silicone if this drips again ?

DogT · Aug 20, 2012

The silicone gasket maker stuff from the auto store. It's not high temp, so it shouldn't matter. It will stick like anything on the cover though. I even used this method on the valve covers and it works pretty good, but the nuts/studs need to be sealed there. If you've got a rubbery one, it may not stick on that side un-siliconed and most likely will pull off without a hammer.

I've used the Hylomar, but never pulled stuff apart, supposedly you can re-use it without more application. Kinda pricy at $15/1.2oz but it works. I used it on my crank flanges.

Dave
69S

CanukNortonNut · Aug 20, 2012

DogT said:
I've used the Hylomar, but never pulled stuff apart, supposedly you can re-use it without more application. Kinda pricy at $15/1.2oz but it works. I used it on my crank flanges.

Dave
69S

Dave
Just curious why you would put the Hylomar on to the crank flanges?
Regards,
Tom
CNN

Hobot · Aug 20, 2012

No need to goop crank/flywheel nor bother with any gaskets in gear box, but both harmless options, unless there's layshaft shift to take up and no shims handly, might just forget about em afterwards.

Torontonian · Aug 20, 2012

Gasket with Hylomar Ultimate. Thanks to all . 3 'rd and final fit.

concours · Aug 20, 2012

Omitting a gasket (unless an emergency field repair) is not good. That .020" is accounted for in the dimensional realm in all but a SCANT FEW applications. The Norton transmission is a definate MUST use a gasket. Dress the gasket with Loctite 518 and it will seal for sure AND peel right off when neaded. http://www.summitracing.com/search/Prod ... ket-Maker/

Hobot · Aug 20, 2012

I was assured by the UK NOC bunch no gaskets needed and last two trannys work just fine w/o them. I await proof I was mislead or misleading others. Might find they work even better w/o. So shim and gasket away, either way works in AMC clearances.

concours · Aug 20, 2012

hobot said:
I was assured by the UK NOC bunch no gaskets needed and last two trannys work just fine w/o them. I await proof I was mislead or misleading others. Might find they work even better w/o. So shim and gasket away, either way works in AMC clearances.

Yes, ahem, of course. The laws of physics are held in abayence in certain demographic areas. :mrgreen:

Hobot · Aug 20, 2012

Well I'll let ya'll know if my tranny ever fails somehow w/o gaskets. I await the location of conflict of clearances clarification to change my decade long practice. There are others sans one or more gaskets so await they're reports at time wears on. Up to .020" gasket spacers needed, huh, does that fall into the lay shaft shim range...

DogT · Aug 20, 2012

CanukNortonNut said:
Dave
Just curious why you would put the Hylomar on to the crank flanges?
Regards,
Tom
CNN

gotta use something there, no gaskets. Mick uses some goop too, I forget what it's called, black and thick.

Dave
69S

CanukNortonNut · Aug 20, 2012

Whoa...when I say whoa I mean whoa :shock:
Ok Dave
What I read was your statement "on my crank flanges" as being the flywheel and L/H, R/H cheek throws,
Not the Crankcases. Had me excited there for a second. What Mick refers to is Stag "Wellseal" Jointing Compound.
Which he recommends to use to join the two halves together with an over night set to leave a tack feel.
Regards,
Tom
CNN

northern750 · Aug 20, 2012

I've never bothered with the outer gearbox gasket. I use a thin coat of Threebond 1194 on one side and have never had any problems.

Hobot · Aug 20, 2012

Postby northern750 » Mon Aug 20, 2012 7:53 pm
I've never bothered with the outer gearbox gasket. I use a thin coat of Threebond 1194 on one side and have never had any problems.

Huh, were you that slackard behind me in my solid state physics courses?

Peel drove me to un-natural drives to ride and also tore up her drive train in a number of ways so I ran out of gaskets and asked the old world dudes about sans gaskets to have guts to try it. If no clearance clash then a bit cheaper if messier as needs goop that gaskets shouldn't, so maybe a bit more stable assembly w/o crush-able seams. Just another option as obviously by far most have gaskets and then a good number of those also layshaft shims is all. Anywho case seam leaks ain't the leak weak points anyway.

northern750 · Aug 20, 2012

hobot said:
Postby northern750 » Mon Aug 20, 2012 7:53 pm
I've never bothered with the outer gearbox gasket. I use a thin coat of Threebond 1194 on one side and have never had any problems.

Click to expand...

Huh, were you that slackard behind me in my solid state physics courses?

Peel drove me to un-natural drives to ride and also tore up her drive train in a number of ways so I ran out of gaskets and asked the old world dudes about sans gaskets to have guts to try it. If no clearance clash then a bit cheaper if messier as needs goop that gaskets shouldn't, so maybe a bit more stable assembly w/o crush-able seams. Just another option as obviously by far most have gaskets and then a good number of those also layshaft shims is all. Anywho case seam leaks ain't the leak weak points anyway.

I'm no slackard, and relatively new to Commandos compared to others on this forum, but when I took the outer cover off my tranny to replace leaky O-rings, the toilet-paper thin gasket was not worth replacing, tolerances are not that tight given 40 years of wear. A good sealant like Threebond will not squeeze out as mating surfaces are tightened. I've gone 6000 miles, no leakage or tranny problems yet...

jaydee75 · Aug 21, 2012

I recently put my gearbox back together and decided that the soft paper gaskets would only get soggy and mash down causing loose bolts or leaks.
I used Loctite anerobic 518, I think. Now I'm metal to metal and dry as a bone.
Thanks, Hobot.
JD75

batrider · Aug 21, 2012

The Andover Norton inner and outer cover gaskets are not anywhere near "toilet paper" thin. They seem to be about the same as the timing cover gasket.

concours · Aug 21, 2012

batrider said:
The Andover Norton inner and outer cover gaskets are not anywhere near "toilet paper" thin. They seem to be about the same as the timing cover gasket.

That's correct. The tissue paper mentioned by another poster is aftermarket, possibly just low grade crap, OR a talented mechs solution to bring the case in closer as detemined needed.

Bob Z. · Aug 21, 2012

The inner gearbox gasket has a tough job to seal the inner cover.
It has 7 holes for the studs and 2 holes for locating dowels which certainly could cause a leak pathway..

Old stock broke when trying to fit it, so I used blue Hylomar with no problem.
This old stock paper gasket measured 0.015" thick.

Gearbox gasketting

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