New RPS clutch slips after driving 15+ miles.....

Joined
27 June 2003
Messages
130
Location
Saint Louis, MO
After reading various searches, I haven't found anything like my problem listed.

After a defective SPEC clutch disc and flywheel was replaced, a new SPEC cutch setup started slipping every drive after about 15+ miles. Under hard acceleration(I don't mean tire spinning) it would slip even from the beginning of a drive. I assumed that the disc never mated with the old flywheel. The original defective setup had less than 3000 miles on it when the defect occured so the mechanic and I chose not the replace the flywheel which was undamaged. Every drive was the same so with less than 100 total miles on the replaced SPEC clutch, I decided to change to a new system.

I then ordered a complete new RPS setup- flywheel, disc, and pressure plate and had it installed and it is doing the same thing. I have approx 200 total miles on this one.

When I let the car cool after a drive the clutch engages pretty strongly and about half way off the floor. After 15 or so miles, the engagement gets weaker and further from the floor. The point of clutch engagement progressively gets further from the floor If I keep driving it and eventually it slips when the pedel is fully off the floor( no foot on pedal at all). A 30 mile drive means walking home!

Could this be a hydraulic issue instead of a mechanical clutch issue? I can't imagine the same thing happening with 2 new clutches.

Other points-
*1995 NSX, 46K miles
*Car has 6 speed conversion which worked great prior to the defective first clutch.
*A certified NSX mechanic from a dealership installed both.
*The RPS has much stiffer pedal pressure than the SPEC did so it's engagement lasts longer when I drive it before it starts to slip.
*There are no leaks aroud the master or slave cylinders.
*Fluid level is normal althought I suspect it is original.
*Pedal pressure remains the same when the slipping starts however the point that it engages the clutch is higher off the floor.


Help!! I hope it isn't the clutch!!! The labor charges are killing me.
 
You need to check the "End Play" in your clutch pedal. If there is no "End Play" you need to adjust it. This is the typical cause of slipping, other then grease on the disks or just a bad clutch. I would find it hard to believe you have three bad clutches or three with grease on them.

End Play can be checked following page 12-4 in the on-line service manual located here:

http://www.nsxprime.com/FAQ/Reference/1991_svcman/1991_svcman.htm

Additionally if the clutch had some hydraulic work and was not bled properly the clutch engagement point will change and therefore the end play will change.

So check the end play and make sure it is bled properly, and if your end play is changing it is not bled properly.

HTH,
LarryB
 
Thanks Larry. I will work on this tomorrow. Based on your response, it sounds like that if after driving the car the engagement point changes then the system needs to be bled. If it is bled correctly, the engagement point should stay the same if everything else is working correctly. Am I understanding this right?
 
Yes, the play should be the same always. Ususally the play will become less if there is an air bubble in the clutch fluid system and the bubbles work there way out. This could take 100 miles, and during that time the pedal end play will get less and less as you use the clutch.

HTH,
LarryB
 
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