Ducati Monster Forum

I was replacing my countershaft sprocket last night and had to pull the clutch slave to clear the chain.
While it was hanging there on the line, the piston pushed out and the slave dripped a bit of fluid on the floor.

After that, I've been unable to push the pistion back in! I even tried cracking the bleeder so that I wouldn't have to push fluid all the way back up the line; no help, the resevior just drained again.

I als can't seem to pull the piston out (I have an Evo replacement piston on hand). So I'm in no man's land; piston won't go in or come out. What now?

 ??? ???

Have you tried using hydraulic pressure to push it out?

Sounds like it may be cocked in the bore.

I'm thinkin' "how do I apply hydraulic pressure?"

By squeezing the lever dipshit! [roll]

No, I haven't tried that. Could get messy. Better be prepared to shoot brake fluid across the barn!

Yeah, it does seem cocked in the bore. Can't imagine how that happened since the pistion just slid out on its own.

I knew the engineer in you would be stumped...

and then the mechanic would take over. ;D

Probably happened on the way back in, or it could be a piece of mung froze it when you pushed back in.

You will need to do a clutch bleed or you won't be getting much hydraulic pressure.

Prepare for a possible spraying, but hopefully it will just pop out. A little heat never hurts stuck things, a hair dryer works fine.

> > While it was hanging there on the line, the piston pushed out and the slave dripped a bit of fluid on the floor.

And did this piston by chance happen to fall out onto anything ??

No, the piston didn't actually fall out and the slave never banged into anything as it hung there.

Get a big container, place the cylinder in the container so the piston and fluid have no choice but go into the container, then squeeze the lever.  A a couple of large size baggies should work also.  Put one baggie inside the other.  If one baggie fails the other should contain the mess.  If the hydraulic pressure doesn't move it it is probably time to retire the cylinder.

Sounds like the Oring is damaged.
Take the slave off and use compressed air, it will come out.

just tie an old rag around it and set it in a pan.  it will all be contained. 

All better.

I pushed it out by pumping the clutch lever. Came out pretty easily.

I think the cylinder had been pushed out so far by the spring that the lip seal was hanging up on the bore when I tried to push it back in and I didn't want to force anything when I wasn't sure. As for it not coming out, there's just no good way to grab it; that was all.

I replaced the factory piston with an Evoluzione replacement; the one with two O-rings instead of the lip seal and spring.

And contrary to my worst fears (based on all the threads here and on TOB), the circuit blead quite easily.

On the road again...