Oil pumped into gearbox

[wayne]

RE5Mike had this problem 18 yrs ago or so. After reassembling the bike he found on he was pumping sump oil into the gearbox. It would have been on the old Bulletin board before this one.

In his case it turned out to be an oil seal installed backwards.

Does anyone recall this problem and more importantly which seal it was? My brain isn't working too well tonight..............

[timpa136]

Greetings Wayne,

Using your own excellent step by step illustrations, I found this. This from your comments,

If you buy this seal from an over the counter bearing shop, you may find that it's thicker than the original. They apparently no longer supply seals like this in the original thickness made for this engine. You can make it work, but you have to machine the spacer in the previous picture down a bit to make it all work. After this bike, I just cough up and buy the expensive original (it has a metal outer case unlike the all rubber modern alternative)

One other thing, don't put this seal in backwards. It has been done. You'll pump a heap of your sump oil into the clutch/transmission in minutes

I recall when warranting an early proper for excessive oil consumption , we were to check the transmission level among other questions before warranting it

P.S. interesting note on the seal around the distributor housing  too, re low oil pressure.   Tim

[wayne]

Thanks Tim. The friend I'm helping hasn't touched any seals but seems to be pumping oil into the gearbox. However, that doesn't mean the previous owner didn't have a go or the seal has completely failed.

Thanks Tim, I suspected it was that seal but didn't want to give advice until I found some reference to it. I was smarter when I made that post lol.......

[wayne]

Okay, found. In this case it's a failure of the engine RHS main bearing seal. It's leaking oil into the primary drive area under the clutch cover which of course ends up in the gearbox.