Clutch woes

[Oldiebut goodie]

Just about everything is crossed now, if this doesn’t work, it will be towed to a scrapyard!

Fixed that for you.

[pi quattro]

Just about everything is crossed now, if this doesn’t work, it will be towed to a scrapyard!

Fixed that for you.

Haha! It’s not that bad, but not far from it!

[pi quattro]

Ok new master cylinder now installed......... still not working, really cheesed off now....

[937carrera]

Check the movement of the slave piston, on and off mounting

[pi quattro]

Could too much fluid in the reservoir cause a problem? With all the bleeding I have been doing, the level is above the max.

[pi quattro]

Check the movement of the slave piston, on and off mounting

What would that show? I am doing this on my own at the moment, no own to push a pedal

Also there is a slight movement of the pedal about 1 or 2 cm before it “connects” with the cylinder, I did read a comment that this could mean the pin on the clutch needs adjusted, but given how far the pedal moves, I can’t see how this would matter?

[937carrera]

What I am suggesting you test for is does the piston move the same distance when free, compared to when there is the clutch springs to overcome. Same distance, slave OK, not the same, fluid getting past seals.

Easier with a helper, otherwise block of woo jammed against the seat to hold the pedal down. Some free play is normal.

As you have done the job twice I am assuming the release bearing is correctly in place on the fingers

[multisi]

Is the pedal firm to push down ? I had to take my clutch master out to repair the pipe so it was empty when I put it back, when I filled up the reservoir I could see an airlock about a inch long in the clear plastic pipe coming out , it wouldn't move down the pipe even with the bleed kit on the slave. I found that pressing the clutch pedal a tiny amount made the airlock go back into the master a bit at a time and only when it had gone could the system be bled through to the slave. Then the pedal firmed up.

[multisi]

You say the same clutch disc was reused, are you sure it was free from the oil that was leaking from the seal ? You said it was slipping so you took it all apart but put the same disc back in !

[937carrera]

You say the same clutch disc was reused, are you sure it was free from the oil that was leaking from the seal ? You said it was slipping so you took it all apart but put the same disc back in !

The clutch isn't disengaging now

[pi quattro]

I have measured the movement at the slave cylinder, it moved about 3/4 of an inch. Spent 40 mins trying to measure movement at pedal and gave up trying to get my hands in there. It must be about 3/4 of an inch. My neighbour has a T25 and I measured the movement from his slave cylinder - 3/4 of an inch. His is a left hand drive but the slave cylinder is on the same side of gearbox as mine and looks identical.
So - the issue must be inside the bell housing or with the clutch itself?

[937carrera]

It's looking that way.

Everything was fine before you removed the box to replace the oil seal and clean the friction plate up ?

[pi quattro]

It's looking that way.

Everything was fine before you removed the box to replace the oil seal and clean the friction plate up ?

Yeah everything was good before, but clutch was slipping due to oil contamination
I only started dicking about with hydraulics because a lot of gunk came out of the slave cylinder boot so I did the right thing and replaced it.

[multisi]

I would have put a new disc in, can they be cleaned up ? The Haynes manual says clutch slip and clutch drag can be due to a contaminated friction disc.

[937carrera]

Have you tried putting the old slave back on ?

For multisi - Clutch discs can be cleaned up with brake cleaner

Have a read here too http://forum.club8090.co.uk/viewtopic.php?f=37&t=137883