Thread: Clutch grabbing

Sounds like MC problems to me. What were the replacement ones you put in, new or used ones and what quality. The fact that it improved things most times you changed it suggests it may be the problem. Was there any fluid loss at all.

G'day Brian
No fluid loss
All components are new, not second hand.
I've tried Delphi from MR AUTO(~$100) and a generic brand from the local clutch and brake place ($33). Same result. It makes sense to me that it is master cylinder related but I can't see any problems with the one I just pulled out. My next step was to get the Delphi MC stainless steel sleeved and see how it goes... But since this last MC didn't make a difference I've lost confidence that the MC is the problem.

The other possibility is that it is the pressure plate diaphragm sticking then letting go. When you say you have changed clutches do you mean both pressure and driven plates or just the driven plate.

Both plates and fly wheel machined.
If it was the plates then I wouldn't have thought that changing hydraulics would have made any difference.
So frustrating.
The only consistent parts are the hydraulic steel pipes, flywheel, input shaft, clutch rod/ arm and spacer on bearing ( Isuzu requires larger spacer)

Originally Posted by County3.9

Both plates and fly wheel machined.
If it was the plates then I wouldn't have thought that changing hydraulics would have made any difference.
So frustrating.
The only consistent parts are the hydraulic steel pipes, flywheel, input shaft, clutch rod/ arm and spacer on bearing ( Isuzu requires larger spacer)

Frustrating all right! Well I guess that rules out any problem with the pressure plate. The other bits you mentioned wont be the problem. Back to the MC I would say. Maybe the ones you have bought have been new (old) stock and the rubbers are a bit suspect and bypassing occasionally. That's about all I can suggest.

contamination on the slide for the throw out bearing, failing flex line, contamination in the pipe or the slave cylinder has some crap in it,

Start by pulling the slave and giving it a clean and then removing and inspecting the hyd lines

I'd go with Blknight.aus . contamination on the slide for the throw out bearing,and/or plastic bush on clutch fork pivot.
Is the plastic clip that holds the push rod into the clutch fork still intact?

Jim.

Update
The symptoms have changed since fitting the MC, now it will only grab when cold. After driving for 10 mins I can't get the clutch to grab, which is frustrating when trying to show a mechanic what's going on! Just after start however, the grab is quite violent and chirps the tyres. Also, it seems worse when the landy is pointing up hill. There is a hill near me that I have to stop at when driving to work and the clutch grabs violently every time (when cold, doesn't when engine warmed up). So, since it has changed again since fitting the MC I'm back to thing it's hydraulic related.