I just rebuilt the TR3 transmission and being a TR6 guy I was surprised
to find a bushing inside the input shaft (at the end of the mainshaft),
instead of the usual rollers. This made me curious because I have an
TR6 A-type mainshaft with a corroded bearing surface (due to outside
storage by DPO) in the same location, but it's otherwise fine. I was
thinking about having it turned down on a lathe to an undersize
dimension and using a made to fit bushing to save the mainshaft, or
having the surface built back up. Any ideas?
Bob Kramer, Austin TX
Hill Country Triumph Club
TR6x3, TR250 x3, TR3A vintage race
rgk@flash.net
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From: twalli@vanheusen.com
To: triumphs@autox.team.net
Subject: TR6 Transmission Enhancements?
Date: Wednesday, December 17, 1997 1:52 PM
My major Winter project this year is the TRansmission on my 73 TR6. It
was
making a lot of growling noise when it was in neutral with the clutch
out
(engaged). I only want to do this once, so I want to do it right. I
was
reading Bob Schaller's book ("More B.S from Bob Schaller"), and he
rants for
a paragraph or two about the use of needle bearings in TRansmissions
and how
they contribute to the design life limit of about 7 years (Biblical
isn't
it?) by gradually hammering away at the surface of the shafts. He
recommends replacing these bearings with bushings that theoretically
are in
constant contact with the shaft rather than the tiny surface that the
needle
bearings afford.
The question I have (yes... there is a question somewhere in here), is
has
anyone actually done this substitution of bushings for bearings? If
so,
what was your experience? What did you use for bushing material? What
clearances did you machine them to? Am I being a candidate for DPO of
the
century, or do I have advanced shipwrights disease? Therefore should I
forget the bushing thing and go with new needle bearings? When I
drained
the oil, my magnetic plug was covered with metal bits - like it grew a
bushy
beard. I think that this may be proof of Schaller's theory about the
bearings being "self destructive".
In any case, this should be good for a thread or two.
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