R32 Clutch Troubles

[12VES]

Hey all,

I've got a 1990 R32 Gtst with 217rwkw and an NPC brass button clutch. I had some trouble a while ago with the clutch not disengaging properly i.e. when pulling up to a set of traffic lights with my foot on the clutch and brake pedal, the car would lurch forward slightly and want to "drive on." I would then have to reef the gear stick out of first gear and in to neutral, and then back into first and then it would be ok untill I had to pull up at another set of lights etc. Initially I put this down to the heavy pressure plate in the car, however i took the car back to my workshop and had them change the pressure plate to a lighter one. The car was then alot more driveable on the street and the problem seemed to go away, until a couple of days ago and it has gradually gotten worse. I can't come to a stand with my foot on the clutch without having to reef it out of gear when I stop. I have changed both the Master cylinder and slave cylinders a few months ago and the clutch system doesn't appear to be losing any fluid, I have bled the system correctly and now I am at a loss. I was wondering whether anyone else has come across anything similar and any help would be greatly appreciated.

Cheers Dylan

[Duncan]

can you see if the slave is disengaging properly? maybe the clutch pedal is not adjusted properly and the slave is not pushing the clutch enough to disengage it

[12VES]

Yeah I'll give that a try and see if it makes a difference. I just don't understand why it was fine for so long and now it has started happening again.

[Simon-S14]

You may need to pull the peddle box out and check to see it hasnt broken any spot welds on it, could be possible that the box is now flexing when you put your foot on the clutch and not acctually pushing the clutch in far enough.

Other issue may be master or slave, i know you said you replaced them but were the replacements brand new? If not then whats to say there isnt a problem there.

Finally, in the middle section between the master and slave theres the box with lines going in and out of it and a bleed nipple..piss this section off all together and just run a line from the master to the slave, then bleed starting from the master followed by the slave.

[Guest101]

Did you machine the flywheel when changing the clutch?

My guess is the flywheel is worn into a funnel shape (only very slightly, probably invisable to the eye). So when you shove the pedal in the clutch plate is still grabbing along the outside edge..

If the flywheel is fine, perhaps there is a physical defect in the pressure plate. Or maybe you have a mismatched clutch bearing (happened to me, I was supplied a bearing slightly shorter than what was required, and the outside clips on the bearing were hitting the solid edge of the pressure plate).

Hope that helps. Clutches can be a real pain.

[12VES]

Cheers guys I'll have a look into it...

[legend01]

I had a similar problem to this once and it was the slave cylinder was bleeding back, seals were on there way out, the more it got used the worse it was but recovered when driven for a while and clutch not used had me buggered for months till I found it ,just wouldnt travel full length same can happen to mastercylinder ...