1150 clutch slip?

[teutonic tsunami jon]

After 46K abusive miles the dreaded slippage occurred. Now, being an engineer I thought I would have a stab at finding the problem myself (trusted local mechanic snowed under with spring workload more like).

Despite being nervous about breaking my pride and joy in two, I did the big split. Clutch plate was greasy but, both engine output and G/Box input seals were dry. There was an almost sooty residue on the forward webbed face of the G/box, is was a mystery as to where this had come from, until I considered the G/box output seal and the small amount of gear oil I found lurking behind the clutch slave cylinder, (I thought it might be Dot 4 but, now think otherwise).

My question to the panel is : Given that I know very little about 1150 gearboxes, is it possible for the output seal to 'let go' and somehow allow gear-oil to transfer along the clutch push-rod shaft and thereby contaminate the plate (traveling a long way forward to only leave a sooty residue on the G/box side of the clutch housing).

Another tale of woe is, when loosening the exhaust header nuts one sheared of without warning, I have used a blowtorch and mole-grips on the stud to no effect.

Any suggestions on how to shift the stubborn remnants of the stud now stuck in the cylinder head, and has anyone had a similar clutch slippage issue?

Thanks. Jon.

 

[(RIP) Mark H]

My question to the panel is : Given that I know very little about 1150 gearboxes, is it possible for the output seal to 'let go' and somehow allow gear-oil to transfer along the clutch push-rod shaft and thereby contaminate the plate

Thanks. Jon.

Yes to the above
Theres a small seal that sits in the clutch slave cylinder hole at the back of the box. Gearbox oil leaks past the seal and down the pushrod tunnel into the clutch housing.

I had to strip the box to change the seal on my R1100, but I believe you can change the 1150 without stripping / removing the box.

Recommend you replace the complete clutch, rather than just the plate.

 

[Steptoe]

Yes to the above
Theres a small seal that sits in the clutch slave cylinder hole at the back of the box. Gearbox oil leaks past the seal and down the pushrod tunnel into the clutch housing.

I had to strip the box to change the seal on my R1100, but I believe you can change the 1150 without stripping / removing the box.

Recommend you replace the complete clutch, rather than just the plate.

There's the answer to your questions.
Small seal deep in the slave cylinder part of the box.

 

[teutonic tsunami jon]

clutch slip

Guys, thanks for that, have a complete new clutch going in and have ordered new output/slave seals from M/works.

Steptoe, not quite got all answers sorted did we? Still looking for some stud therapy!
lol.

Jon.

 

[(RIP) Mark H]

Jon
Theres loads of advice on on here for exhaust studs, just type "Exhaust Studs" into advanced search, 850/1100/1150 and read up, everyones got a solution!

 

[teutonic tsunami jon]

Stud out!

Thanks EasyR, will try that!

Thanks again.

Jon