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Roller Throw Out Bearings

To: "Dodd, Kelvin" <doddk@mossmotors.com>, "MG Digest"
Subject: Roller Throw Out Bearings
From: "N" <twobees@sprynet.com>
Date: Thu, 7 Aug 2003 22:24:37 -0400
Here's my experience with Roller T.O. bearing:

Last year when I installed the new engine, I too went for the extra $$ &
installed a roller (brand new).  700 miles later I removed it as it was
totally fried (I do NOT ride the clutch.  But, the bearing was blue from
overheating.).  I replaced it with the old carbon one I had in for the
previous few years.  During the course of the year (July '02 to July '03) I
had the engine in & out a total of 5 times to replace various clutch parts.
At one point, I noticed that the bearing carbon was wearing off-center.  I
then re-examined the roller bearing & saw that there were tiny "swirl" marks
on its face from grit between it & the pressure plate.  That got me thinking
that the bearing wasn't centered. (Brilliant, Watson!  A little slow on the
comprehension?)  On further investigation I found that the t.o. arm was from
the early trans.  And, when I switched to a 4-synchro box a number of years
ago, my (then) trusted mechanic had used the old arm.  DUHHHH!!!  It's
different, fella!   It's about 1/3 inch difference in length.  THAT WAS WHAT
CAUSED THE ROLLER BEARING TO FRY.

So, would I use one again now that I have the correct t.o. arm?  Perhaps IF
I had a way to adjust it away from the face of the pressure plate when
retracted.  With the stock hydraulic system, that isn't possible without
rigging a spring & stop.  If anyone comes up with a system.  Let me know.
I'm willing to give it a try.  I have another roller t.o. sitting around
waiting for a solution short of a Tilton system.

Norm Sippel
'66 MGB

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