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There is one more possibility that is a really rare occurrence
but it happened to me. I had taken the clutch apart
several times and could not find anything wrong with it
but if I would partially engage the clutch it would grab
and creep, sometimes pulling pretty hard even if I floored
the clutch, until I yanked it out of gear, then it was normal
until partially engaged again. Real pain in the backside
and I asked LOTS of people what it could be, with no other
answers than "it is a hydraulic problem" (I had all new hydraulic
components so I was pretty sure it wasn't.)
Turned out I was using a reconditioned BMW clutch disk
which has a metal button just inboard of the friction surface
and is supposed to signal you (I guess by making noise) that
you need to replace the clutch plate. I put in a clutch disk
that didn't have this button and the problem has never
recurred. The button is the head of a rivet, so using
your trusty Dremel Moto-Tool and your #409 abrasive
cutoff disks you can remove this rivet and probably
accomplish the same thing. My facings were worn pretty
bad by the time I figured this out. I think what it did was
to cock the disk on the spline so it couldn't move as
freely in the axial direction.
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