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928 clutch problem

 
Old 02-19-2005, 03:06 PM
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gasmanstl
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Default 928 clutch problem

I have an 85 928 euro with what I consider a somewhat bizarre clutch problem:

The clutch does not *completely* disengage the engine from the tranny until it's depressed absolutely, every millimeter, to the floor. If the outside temperature is below about 40 degrees F and the engine is cold, it *never* completely disengages - unless you allow the engine to warm up, and then it will. (When still cold, the car doesn't want to go into gear, and you can tell that the clutch is still dragging, even with the pedal to the floor). However, the "real friction point" of the clutch is where it belongs, about half or 2/3 of the way up. So, in other words, the clutch drags, but *just barely*, just a few millimeters from the floor all the way up to the "actual friction point," and then behaves normally.

My first thought was air, which would be consistent with better behavior when it was warmed up - but there was none upon a thorough bleeding. The entire clutch has recently been replaced (and the old one did the same thing).


Anybody have any ideas? I don't know what to do next except to just replace the master cyl and/or slave cyl just hoping the problem will go away with one or the other.

Thanks in advance...
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Old 02-19-2005, 09:36 PM
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hupp
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It's not uncommon for your clutch to require every bit of travel when new, but drag should not occur. The friction disc(s) are is(are) thicker; therefore, the clutch will "grab" quicker. (Don't know your model is single or double disc.)

My clutch is new and I've been fighting the same problem for about a month now. I thought the only logical problem was travel since the clutch mechanicals were new. I bled, changed master, bled, changed slave, bled, adjusted and re-adjusted and the drag persisted. I dropped the clutch today and found the short splined shaft to be worn and this prohibits the free movement of the discs. I was able to immediatly notice worn splines (notches) where the "flywheel" disc is installed (double disc clutch). The short splined shaft was the only clutch part that was not previously replaced. Is your short shaft new? If not, I suspect that you may have the same issue.

I'll be giving Jim B. a call first thing Monday....

Last edited by hupp; 02-19-2005 at 09:54 PM.
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