Gearbox leaking oil everywhere

John leathers · Jul 27, 2018

having rebuilt the gearbox and followed the advice of a well known Norton engine builder. I greased the inner and outer paper gaskets on assembling. I now have a pool of oil if left on centre stand. My question is what would you use on paper gaskets to seal.gearbox mating surfaces are flat and nuts are tight.looks like gearbox apart. Many thanks John. Norfolk

madass140 · Jul 27, 2018

a light smear of grease.

tomspro · Jul 27, 2018

http://gasgacinch.com/

eskasteve · Jul 27, 2018

Mine's together with a light even smear of grease. No leaks in 25,000 miles.

baz · Jul 27, 2018

you only need grease

rvich · Jul 27, 2018

Are you sure it is coming from a gasket and not the kick start shaft?

maylar · Jul 27, 2018

I use Permatex high-tack on both sides of a paper gasket. The red stuff in a rattle can.

concours · Jul 27, 2018

Loctite 518. Seals tight, comes off like a stickynote.

Fast Eddie · Jul 27, 2018

I use Wellseal. Probably no need really, just ‘belt and braces’ but old habits and all that ...

oldmikew · Jul 27, 2018

When you strip the box , if its not from Kstart shaft seal and running underneath the most likely cause is that a gasket has folded on assembly. Cant remember now its so long since I worked on the Box ( failed sleeve gear bearing ) but I think I assembled it dry

Torontonian · Jul 27, 2018

The kicker O-ring can be upgraded to a proper seal. I would wipe down clean everything then refill then put down rags and a catch cup to determine where the leak is from.

MexicoMike · Jul 27, 2018

As noted, it's not the gasket material. If it's leaking past the gasket, it's likely that either the gasket tore or folded on installation or the mating surface of the parts is damaged/nicked/warped.

As far as gasket sealer - any of the common products will work just fine...as will completely dry. The sealers can fill some flaws or slight warpage in the parts but if everything is true, they are not necessary. OTOH, gaskets themselves are not necessary for most parts if you want to use something like Yamabond, Permatex Moto, etc. You have to be a bit careful about that because on some occasions, the factory gasket is part of the clearance for certain applications.

cash · Jul 27, 2018

All ways fit gaskets dry and never had a problem.

Dave

Lineslinger · Jul 27, 2018

Best stuff out there.

Permatex® Aviation Form-A-Gasket® No. 3 Sealant Liquid

https://www.permatex.com/products/g...x-aviation-form-a-gasket-no-3-sealant-liquid/

oldmikew · Jul 27, 2018

Torontonian said:
The kicker O-ring can be upgraded to a proper seal. I would wipe down clean everything then refill then put down rags and a catch cup to determine where the leak is from.

yes I did that ... do not remember the oils seal part no but it was a modification that came vis the good offices of the US Norton Owners club ..

Brooking 850 · Jul 27, 2018

I have just had my AMC 4 speed apart to replace the sleeve gear bushes and bearing , used JS Motorsport silicone gaskets.
Sealed up tight and no leaks
https://jsmotorsport.com/product/gaskets/
Previously just used a light smear of grease on the original oil paper gaskets, no issues with those.
Regards Mike

Onder · Jul 27, 2018

Paper with Wellseal. Crankcase Wellseal with silk thread. Wellseal is pretty close to Aviation Permatex at least by
sight and feel.
Next case job will be with one of the Yamabond type glues. High Torque gray Permatex seems close to this stuff.

acotrel · Jul 27, 2018

If you rebuild your gearbox on a rag on a bench, be careful that you don't get anything caught up between the mating faces.

Gearbox leaking oil everywhere

Similar threads