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Final drive sprocket oil seal and gear change shaft oil seal....

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Athame57:
I had the left crankcase cover off the other day and found the whole surface beneath it was covered in a film of oil and the cables leading to alternator where wet with it too. The gasket does not appear to be leaking so I'm sure one or both of the seals there, the is the final drive sprocket oil seal and gear change shaft oil seals, but will this take splitting the cases to do. If not what should I have and need to know to proceed?

JezzaPeach:
Mine is a 500/4, hopefully similar.
If you clean it all you may see a wear gap between the gearshift spindle and it’s seal. Some say this is the main culprit and mine was. I very carefully drilled a small hole in the middle of it’s ‘ring’ (didn’t need two). Under the coating it’s fairly hard metal but not thick, so patience and care not to let the drill slip pays off. I marked the case a tiny bit but no matter. Then screw in a smallish screw and mine wiggled out (seemed more effective than hard pulling) It wasn’t tight.
The new one drifted in easily with a length of white plastic overflow pipe which had the right thinness and rigidity to work. Mine really just pushed in not hit, but think I tapped it a little to hear the sound of it being firmly seated.
Re 500/4 only:
My drive shaft seal was fine. The clutch push rod (500) seal had been a bit rubbed by a wrong sized ring seal chain, so I replaced that. It sort of levered out with a bit of fiddling with the short end of an Allen key into the hole. Watch out not to lose inside a small circular spring that can come off the back of it, although behind there’s a partial disc with a hole for the clutch push rod. The chain had snapped the push rod (replacement from Julie/Trigger) the long part of which would only come out on the clutch side (another story)

Athame57:

--- Quote from: jeremypeachey on September 07, 2020, 10:33:00 PM ---The new one drifted in easily with a length of white plastic overflow pipe which had the right thinness and rigidity to work.

--- End quote ---
Thanks for this Jeremy. I'm not sure what you mean with the white plastic overflow pipe though?

robvangulik:
He used the plastic pipe to push the seal in...

JezzaPeach:
Yes (if it’s the one that’s leaking) you just slide the seal over the gear spindle and push it evenly and carefully with a piece of tubing slid over the spindle. And just a thought about drilling the small hole, it might help to put an old spanner or something hard against the side of the drill bit to stop it trying to skate all over the place on the narrow surface of the old seal, so it can’t touch the nearby soft alloy casing. Very little space to play with on the 500/4.

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