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

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TrickyMicky:

--- Quote from: Athame57 on September 07, 2020, 09:06:48 PM ---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?

--- End quote ---
  Before you do all this, look for simple first. Make sure it's not oil and crap that's been thrown off an over lubricated chain, over the years it can build up quite substantially and that cover is not one that's going to be removed every couple of weeks to be cleaned out!  When I renewed my rear chain a couple of months ago that is the sight which met my eyes upon dismantling, am now a definite convert to aerosol dry wax lubricant.

Rob62:
As already stated, have a good clean round the area to degrease it so that you can determine exactly where the oil is coming from. Once you are sure its the oil seal you should be able to carefully prise it out either by drilling a small hole and screwing in a self tapping screw and then using this to pull, or my preferred option (less trouble) to carefully punch a small hole with a narrow flat bladed screwdriver and hammer and then prise it out... a hole at each side will help. Clean the whole area before refitting the new seal. As far as the seal is concerned you can buy good quality japanese or european lip seals from any industrial bearing supplier, usually over the counter, for just a few pounds. Get a couple of spares while you are there. When you come to refit the new seal be careful not to damage the lip of the seal on the sharp edges of the drive shaft (if you do you can go straight to the spare you just bought rather than back to the shop). You can wrap a length of sellotape over the splines to protect the lips and also use plenty of lithium grease to slide it over. You should be able to press the seal in by hand at least to get it started, then use a piece of tubing (without sharp edges) to gently tap it home. The concave side of the seal should face inwards. If you dont have any tube then use a flat ended punch or drift and gently tap whilst working around the edges of the seal to ensure it goes in flat and even. Good luck. Don't split the cases as that is an unnecessary waste of effort.

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