V8S Clutch problem

[melv8s]

I've just had new clutch master and slave cylinders, pressure plate, friction plate, release bearing - pretty much everything bar the pipe work. For some reason the clutch will only fully disengage with the pedal about an inch up from being fully depressed - go beyond that point and it starts to re-engage. Has anyone any idea why this might be? It's got my bloke flumoxed....All suggestions VERY gratefully received.

[melv8s]

Thanks all, extremely helpful - It's been bled at least 4 times now so I think it must be the cylinder diameter. I'll get on to Racetech who supplied them and see what they say.

[melv8s]

Racetech are absolutely confident that master Q0012 and slave Q0010 are correct. However, to solve the problem they do have a slightly bigger bore slave version available (from early Griff/Chim) which might help a bit, but they say that's not likely to be the cause. The pressure/friction plates came from Rimmer Brothers, apparently, matched to the engine gearbox numbers and I'm trying to find the part numbers from them. Racetech suggest there may be a second pivot point on the pedal and the wrong one is being used - I'll check that tonight, but it sounds too easy! My bloke's other suggestion is to drill a new pivot point on the pedal, which might do it but is not a very elegant solution...again, thank you all for your help.

[melv8s]

Thanks again all. As a small update: The release arm/fork was also replaced with the heavy duty version with the reinforcement patch on the back. Also the point above about the pivot point isn't right - having had a look this weekend the pedal is hinged at the top, the first hole (going down) has the spring and the second hole has the push rod for the master cylinder, so that must all be ok. He's used up all the adjustment on the pedal, but the theory put forward above about overthrowing the pressure plate must still be most logical...it's just a question of why. I'll take your combined wisdom above to my man on Saturday. Thank you again.

[melv8s]

GreenV8S - exactly as you describe, press the clutch pedal 2/3rds down and it's fully disengaged. Continue to the floor and it re-engages. As you then let the pedal back up again it disengages at the 2/3rds points and re-engages as you lift further off.

[melv8s]

Barkychoc - I think I would call it 'partial re-engagement'.. I think what you suggest is probably right, it's a question of why it's happening if, as Racetech say, the slave and master are definitely correct. Shortening the rod on the master would probably solve it, or a larger bore slave (which I gather is available from an early Griff). I expect I'll get there eventually. Thanks all!