Ok here is the problem in the last 4 years on my 96 i snapped the clutch fork
bought all new fork, clutch ,and had flywheel resurfaced
2 yrs later i broke the throwout bearing same as CTEUFERT he has a pic posted on his thread.Again new clutch and flywheel resurfaced and last night the piece of chit broke again have not taken it apart yet but sounded like the same problem again oh the clutch is the SPEC STAGE 1 anyone have a clue what i have going on here thanks for the help anyone .So mad i just wanted to sell the car but ill let it rot in the garage before i sell it for $5,000.THANKS AGIAN for the help

 

When you had your flywheel resurfaced, did you add shims to get it back to the original position in relationship to the clutch fork? Just a thought.

Bob

 

I ACTUALLY dont believe i did would this cause this to happen,also had a little clutch chatter when clutch was about to engage about 95% of the time.

 

Fast...I really am not sure...was just a thought. I do know that if the flywheel is not in the stock position that the angle of engagement of the fork to the throw out bearing does change. How does the slave cylinder rod look? Is it straight or bent to any degree? I also have a 96 m6 and fortunately to this point have had no issues. I did change the clutch, pp and flywheel a couple years ago with no issues.

Bob

 

Fast..one note on chatter. My car also had it when my clutch master cylinder was bad. I changed it and have had no chatter at all. My clutch master cylinder finally got bad enough where it leaked a very very small amount inside the car.


Bob

 

I have taken a look at the throw out bearing that failed on my 95 Z28. No marks showing excessive wear as if the fork was in the wrong place or angle. The throw out bearing simply tore apart at the weakest point. It is not a part machined from one piece, it is a stamped tube with reduced diameter end that a ring slips over. THe reduced diameter section of the tube is mashed over to hold the ring one. This ring is what the clutch fork bears against and since it is only held on by the already reduced thickness of metal that has all sorts of stresses in it from being mashed over it will fail at that point.

The idea of a hydraulic clutch is that it does NOT need to be adjusted like mechanical linkage. It should adapt to the slight difference of positioning of the flywheel.... we are only talking 0.015", about the thickness of 5 sheets of paper. If it were that critical, some method of measuring and adjusting the pivot ball would be well documented.

One possible failure is excessive pressure being applied to the clutch pedal causing the throwout bearing to some how bottom out then be deformed. However if this were an issue failures like this would have occurred from day one and probably on test drives from the dealers lot on every type of vehicle using the LT1 with 6 speed. It would have been corrected by GM by either putting a stop in place or making it impossible to bottom out the throwout bearing.

Since replacing my repairing my car I have noticed the clutch is much smoother, doesn't chatter and is easier to push in. The clutch that failed was replaced by the previous owner. It is possible they put in a higher performance pressure plate... with stiffer springs to hold the clutch more firmly. This would account for the higher pedal force and could have overloaded the throwout bearing. I don't like the design of the throwout bearing and expect this design to fail as mine did more often when used with higher performance pressure plates.