CLUTCH SLIPPING
One of the most common clutch problems is slipping. Clutches are supposed to slip while the clutch is being engaged so the vehicle does not jerk or lurch forward when starting out. The clutch also needs to slip when the gears are changed to ease the shock on the transmission and drivetrain. But once the clutch pedal is fully released, the clutch should hold firm and provide a solid coupling between the engine and transmission. If it does not, something is wrong and needs to be investigated.
Slipping will be most noticeable when the engine is under load, as when the vehicle is lugging at low speed in a high gear, when driving up a hill, when accelerating to pass another vehicle or when towing a trailer.
A little slippage usually leads to more slippage. Slippage increases friction and produces heat. The hotter the clutch gets, the less able it is to maintain its grip and the more it slips. The vicious cycle that results can burn the clutch facings and damage the flywheel and pressure plate. So, the sooner the problem is diagnosed and repaired, the less likely these other components are to be damaged.
Normal wear is the most likely cause of slipping if the disc is worn down to the rivets and the clutch has high mileage. Oil leaking from a faulty rear main crankshaft seal or transmission input shaft seal also can contaminate the clutch linings and cause the clutch to slip.
If a newly installed clutch is slipping, the most likely causes would be:
* Oil or grease contamination;
* Incorrect release system adjustment;
* A defective cable adjuster;
* A blocked clutch master cylinder port or binding slave cylinder;
* A misaligned or improperly installed release bearing; or
* Improper flywheel machining of a step or cup flywheel.
One way to check for slippage is to test drive the vehicle and lug the engine at slow speed in high gear. If the engine races, you have confirmed the problem.The clutch also can be checked by setting the parking brake, chocking the wheels, putting the transmission into high gear and slowly releasing the clutch pedal (make sure nobody is standing in front of the vehicle when you do this!). If the engine immediately stalls, the clutch is not slipping. If the engine continues to run when the clutch pedal is fully released, the clutch is slipping badly and needs repair. If the engine slows but continues to run, the clutch is slipping.
If the vehicle is equipped with a dual-mass flywheel, a bad flywheel may be the cause of the slippage. Carefully examine the old clutch for heat marks on the pressure plate, disintegrated disc friction material and contamination of the friction material from external oil leaks. If no such evidence is found, the problem is the flywheel.
An aftermarket solid flywheel can be installed in place of an OEM dual-mass flywheel (if available). A solid flywheel is less apt to cause future driveability problems and will save your customer some money.
found this here
http://www.aa1car.com/library/2002/ic100237.htmdunno true or not. just read articles about cars just now...
wah..good info..clear my doubt..but once question, if i always drive and park my car and release the clutch when idle and gear is still engaged to switch off the engine, will it cause my clutch to slip if i do it constantly?
Apr 19 2008, 12:15 AM
woh.. math is another compulsory woh.. 
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