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1988 s10 4 cyl 5spd replaced clutch every 2 years along with master/slave cyl.pressure plate cooked disc still says fly wheel side on it. 2500 miles clutch is slipping so bad not driveable again.

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You need to check a few things there. First, make sure that the support be3aring in the rear of the crankshaft is not worn out. Second, check the transmission input shaft to make sure the disc can slide freely on the splines. Third, make sure that the input shaft bearing isn't worn, allowing the shaft to wobble. Any of those items can cause engagement problems.
Additionally, have the flywheel re-faced and do not use a rebuilt pressure plate assembly...I have seen many that have been re-machined to the point that they cannot apply full spring pressure to the disc, allowing it to slip.
Make sure you use the correct height throwout bearing. Many times there are up to three versions.
If you use one that is too long, it will continually push on the pressure plate fingers and allow some slippage.
Last, there are different grades of friction material available on discs (same as brake pads). Make sure you don't go "cheap" there or you are inviting failure.
If you are exceptionally hard on your equipment, you may do better using a street/race clutch from an aftermarket source such as scheifer or hayes. Those units are built for abuse and will last far longer than any factory items.
Good luck with it!!!

Posted on May 03, 2010


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Why does it drive well for 30 minutes but after that will go into gear but wont move?

I suspect that the full engagement of the clutch pressure plate is not being achieved
if a pressure plate is held at reduced application pressure , it will continuously slip marginally and this build up to a point where the clutch plate will not absorb any more heat and so it fades and slips completely ( same affect as brake fade from worn pads and too heavy brake application -like long down hill runs )
the area I would check is the clutch master cylinder as it appears that the compensating port is blocked , and holding pressure in the clutch line which with increasing heat from the clutch builds up more pressure and compounds the pressure plate problem
this is identical to a heavy truck clutch problem where full testing produced no problems , yet at 100 miles and on a range the clutch failed completely but when cooled down again tested as good
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