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post #1 of (permalink) Old 03-14-2001, 12:48 AM
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Slipping clutch question..

When a clutch is slipping, what is actually causing the slipping ? It actually does it in 2nd or 3rd gear if I hit the gas hard, so I am planning in advance so when it becomes more of a problem, I will know what to do... I plan to do the work myself, possibly with the help of a friend and I have the haynes manual, which I already read how to take the drivetrain appart to get to the clutch... Thank for the help I will receive !!!

A Jeep is a Jeep..
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post #2 of (permalink) Old 03-14-2001, 02:44 AM
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Re: Slipping clutch question..

I caught this info in the Net, it gave me a good idea..

> I am experiencing some clutch slipping on my 325i. During normal
> driving at any speed, it drives and accelerates just fine. But when I
> try to launch my car from stop at anything over 3000rpm the clutch
> starts to slip until it eventually catches up. My question is:
> 1. Is this a sign of a worn clutch?
> 2. If it is, what part of the clutch needs to be replaced?
> 3. What is a good aftermarket clutch upgrade for a I6 e36
> 4. How about upgrading using clutch parts form a M3?
> TIA,
> Joe.
> '93 325i
> Doing 0 to 60 in 20 sec...

Yes, this is indicative of a worn clutch. The disk is worn to a point
that the clamping force of the clutch plate on the disk is overcome by
the torque of the motor. Higher-rpm launches will exacerbate, or even
make worse [a Dave Barry-ism] this situation because:
a: higher rpm ~=more torque than just off-idle (more torque, obviously,
at 3000 than 1500 rpm on your BMW motor)
b: sliding friction is less than static friction, plus
c: you're not off the clutch 100% as you launch, reducing clamping force,
hence more slip.

STOP doing hard launches like this. ANY time you slip the clutch from
here on out will accelerate the wear and hence the amount of slippage.
I assume you knew this, though.

It is ALSO indicative of contaminant on your clutch disk friction surface
or glazing. A rear main crankshaft oil seal leak can get motor oil on the
flywheel and clutch. Doh.

A Jeep is a Jeep..
post #3 of (permalink) Old 03-14-2001, 08:34 AM
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Re: Slipping clutch question..

You can have a clutch rebuilder add stronger springs to your pressure plate, which will make the next disk last longer.

Even the best equiptment is worthless, if you don't know how to use it.
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