Clutch chatter can happen for a variety of reasons:
1) Pilot bearing worn out.
2) Clutch disk burnt
3) Clutch disk into the rivets
4) Burnt face on either the flywheel or pressure plate
5) Broken or weak spring in pressure plate / warped on install
6) Throw out bearing locking and skipping
7) Bent throw out actuator arm holding the throw out bearing.
8) Engine to tranny bolts loose
That is all I could think of in 20 seconds.
How Serious?  ................. sound like it is going out. Plan on
replacing it soon but it might run 20K more.

Stan Wilder

On Tue, 1 Apr 2003 14:09:23 -0800 Art McGinn <amcginn@MICROWEB.COM>
writes:
>    my '82 vanagon had a new clutch installed about 12k back but,
> later, some
> "chatter" began surfacing when the van is on an upgrade and
> starting-up from
> a dead stop. the chatter, which feels like internal bucking from the
> rear
> end, stops when the clutch pedal is disengaged. i am told the
> chatter is due
> to an ill-matched surface, like clutch and pressure plate or
> something.  the
> question is, is this a fatal condition or one that just sounds bad?
> is such
> a clutch going to go bad sooner rather than later? otherwise, gears
> shift
> easily and clutch is normal. thanks for any thoughts. art
>
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