> [The clutch specialists made an interesting observation about the
> weight of the TR6 clutch. The wear on the diaphragm was about 10 mm
> from the ends of the fingers. They believe that the clutch was
> designed for a smaller diameter TOB that would press closer to ends
> of the fingers. This would reduce the actuating force. However, the
> size of the gearbox input shaft precludes the use of a smaller TOB.]
I believe it fits multiple applications, some of which may well have a
smaller diameter TOB.
> 1. Has anyone else had problems with oversize taper pins? Is there
> only one size? Is one supplier better than another?
I've not had a problem, the pins I got from TRF fit just fine. However, I
definitely recommend having the fork and shaft drilled for a 1/4" cross bolt
with a nyloc nut, thereby ending broken taper pins forever. I used grade 8,
but it's probably overkill.
> 2. Has anyone replaced the little trunnions on the release forks?
> They are available separately and appear be replaceable.
I have (although the gearbox is now in my TR3A). ISTR I used my 6" bench
vise to press in the new trunnions. Went pretty easy.
> 3. Why do these trunnions wear so much? The rotation of the TOB
> carrier is constrained by a pin and the trunnions move up and down in
> the carrier only slightly as the shaft and release fork rotate. Is
> that enough to cause the wear?
They also rotate against the TOB carrier, and are under a great deal of
pressure at the time. A little lubrication at installation will help, I use
a dry MoS2 spray.
> 4. How long should a TR6 clutch last? I thought 56k miles was
> reasonable but now I know that it is at least the second clutch.
That does seem awfully short for the wear you describe ... are you sure it
isn't 156K miles ? Or perhaps it was all in-town driving. Like that
proverbial cream puff, driven by a little old lady from Pasadena, only 15K
miles ... 1/4 mile at a time !
Randall
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