748 Oil Leak Clutch Cage/pushrod

Your the second person this week with this issue, i personally haven't had this happen to me but i think if you had put it under technical help you might get a better response.

 

Sam, there are a couple of rings in-board of the clutch pressure plate top hat, and another the other side of the basket, is the big 95mm clutch housing seal ok? The push rod o rings can be easily damaged due to burrs on the crankcase on the slave side cutting them but that should not show as a big leak in the clutch housing. Is the push rod clean and smooth and the needle bearing inboard that seal ok. Is that the end float shim on the splined part of the shaft ( there are 5 different sizes available)? Looks like you are due a new basket soon
Download the parts book and factory manual for more info

 

not saying for certain, but a fair chance it's seal behind basket.

 

+1 for Chris’ suggestion, all that oil on the clutch side fairing that’s not down to a failure on the push rod o rings IMO. But don’t fret it’s easy enough to replace if that is the issue, at least if I can do it anyone else ought be able too.

 

nearly always is "the big one" and easier to remove than "the little one".

 

That looks absolutely fine. I wouldn’t change it if not needed theyre fiddly to reseat correctly. It just seems so much oil to have just migrated along the push rod

 

If you pull the spacer out on the input shaft, there is an o ring inside it.

 

The type of oil lip seal that runs on the spacer can can cut in to the surface, the lips can also wear/harden.

Clean the outer surface with some scotchbrite. The seals don't work well on polished/shiny surfaces.

Oil can also track through the 8 clutch basket screws, if the thread lock has failed.

 

I found a small puddle of oil underneath my 748R one morning at Portimao. It got progressively worse and seemed to be related to higher rev laps.
I got it back and cleaned off the inside of the right-side fairing and back of the engine. It was definitely a clutch
issue.
Next time out at Almeria all seemed good. Then it wasn't. The leak was not significant, but needed cleaning off after each session.
Then it became a lot worse and a nice slide out of turns 13/14 after the long straight max revs saw me very gingerly head back to the pits.
In spite of a lot of very kind folk offering help it wan't until I got home and Paul Goodall @ PGP took it apart he discovered a bent push rod that had wrecked the seal.
Took that opportunity to change belts, check clearances, replace worn rockers, heavier rear spring and new seals, fork oil & seals, oil and filters. Now just need a track day.

 

Is the oil seal at the clutch end of the shaft (where the pushrod sticks out) fitted the right-way round? Because if it is fitted backwards then oil will pass by it.

Don't ask how I know...

 

Sounds good.

I think my eyesight was playing up when I changed mine...

 

That looks like the outer cage or bush the needle roller would be housed in.
Steve

 

That pile of broken bits came out of that bush.