Dick, the pressure plate and clutch plate were both new and replaced at the
same time (it was part of a TRF magic clutch kit). The flywheel was
resurfaced.
Clutch plate shows no sign of wear
Flywheel shows a very slight sign of wear
Pressure plate has a noticeable step in it.
Understand your point about the disc straddling the step, not sure if can do
that after installation though. Also understand your point about poorly
installed cover plate. I'll be sure to check that on reassembly.
None of this is going back in the car but I am still curious to know why this
system failed after 400 miles..
Stan
-----Original Message-----
From: Sally or Dick Taylor [mailto:tr6taylor@webtv.net]
Sent: Thursday, March 06, 2008 2:54 AM
To: Foster, Stan
Cc: 6pack@autox.team.net
Subject: Re: [6pack] Worn pressure plate as the cause of clutch judder ?
Stan--- The clutch plate, counting both sides, has about .120 of lining
on it before hitting the riivets. Altho we don't usually wear down a
clutch this far, I have seen them worn down to where there was only
about .030 of linng left, and the clutch did not slip. Having a step in
the pressure plate of about 1/32 is not in itself a reason for the
slippage. It should still "clamp". The problem most is likely from the
clutch plate not fitting or riiding down inside this step. If a part of
the disc is trying to ride the lip, it will slip and judder.
Different diameter clutch plates could be the culprit here. Variations
of .125 aren't uncommon when going from one brand to another, and using
the old pressure plate.
I've never seen a pressure plate wear down like the one you have, but a
step in the flywheel could cause the same judder that you feel. (That, I
have experienced when changing to a different disc that was a little
larger)
A cocked pressure plate could also cause the slippage and judder, as
with Seth's '76 TR. You'll want to be sure that it mates flush with the
flywheel when installing. A few thin feeler gauges around the perimeter
can come in handy as you tighten down the clutch bolts.
I'd be interested in how you come out of this!
Dick
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