Thanks, Dick. The shop assured me they aligned everything properly; and I
know from personal experience during my restoration that the alignment pins
are present.
If it really drives me crazy I'll loosen the bolts and wiggle things for a
slight realignment. My next actions would depend on that outcome.
Michael
-----Original Message-----
From: tr6taylor@webtv.net [mailto:tr6taylor@webtv.net]
Sent: Monday, November 26, 2007 2:50 PM
To: Campsmith, Michael (CDC/CCID/NCHHSTP)
Cc: 6pack@autox.team.net
Subject: Re: [6pack] Squeaky throw out bearing?
Michael---Your suspicions are correct, in that the squeal you hear is coming
from the throwout bearing, as it makes and loses contact with the
(spinning) clutch. There are reasons for this sound to show up only when there
is a partial load on the bearing. The bearing itself probably is not (yet)
going bad, but sounding off from the probability of it spinning in a different
circle than the clutch. When the clutch is disengaged, the friction between it
and the bearing is great enough to avoid slippage, hence no sound.
So far as to why this has showed up "after a recent transission service"
I will offer a few possibilties:
a) The tranny was bolted to the engine backplate without the proper alignment.
(The dowels or 3/8" bolts were left out) This can set up the noise you hear.
b) The front cover that the t/o bearing carrier slides on may be worn to a
point that misalignment is taking place at the tob / clutch junction.
c) Some bearings are just not up to the task, even after only the few miles
you have. If this is the case, the squeal will get progressively louder and
will continue protesting deeper into clutch pedal depression.
Michael, I would ask the shop who did the work if they reinstalled the
alignment bolts when put the tranny back in. If they give you a blank stare,
there's your answer.
It could be possible to align the tranny again without taking it completely
out, by loosening all of the bolts and tapping in some dowels. (These 3/8 inch
holes are located at approx. eight and two o'clock, looking from the back,
forward.)
There should be no real harm to drive the car as-is. As the squeal gets worse,
you'll know when it's time to fix it!
Dick
From:
mgc4@CDC.GOV(Campsmith, Michael (CDC/CCID/NCHHSTP))
Fellow listers--
The transmission on my 1974 TR6 was recently serviced and now I have a noise
that wasn't there before.
There is no noise with the clutch either fully disengaged or fully engaged.
However, the noise--a "squeaking" sound--comes on when I first depress the
clutch pedal, goes away once the clutch pedal is depressed completely, returns
when the clutch is almost fully let out, and is gone once the clutch is again
fully engaged.
The symptoms above make me think it is the throw out bearing. My dilemma comes
about from not wanting to pay for another transmission removal and replacement
of what was a previously silent bearing. The entire clutch mechanism and
bearing were replaced less then 5k miles ago--the brand name isn't coming to
me but might be in my records.
Any other thoughts on possible sources of the noise, or better yet a "magic"
cure?
As always, your insight is greatly appreciated.
Michael Campsmith
1974 TR6 (now BRG)
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