John:
The diaphram on the 4a/6 are a different size than the 3a/4. It is about
1/2" smaller across. To use the 4a/6 diaphram you have to have to correct
flywheel, or have one drilled and balanced (cost about $80 in Wi.). Some of
the late 3's I have taken apart had the flywheel you need. If you look at
the holes for the diaphram there will 6 threded holes for the 3a/4 and 6
holes drilled and threded for the 4a/6 diaphram. This is the correct one.
The biggest advantage to this diaphram is less weight.
Hope this was some help
Bob Kamholtz
ECOD
-----Original Message-----
From: John Middlesworth <jape@email.unc.edu>
To: triumphs@autox.team.net <triumphs@autox.team.net>
Date: Tuesday, February 02, 1999 8:41 AM
Subject: Fitting diaphram clutch to TR3
>
>I've read that there are advantages to fitting a diaphram clutch (as used
>in a TR4A to a TR3). Are the advantages in longevity or performance?
>
>My own situation is the following: I'm working on a late TR3A (TS78922L)
>and I think I could fit a TR4A flywheel and clutch and be done with the
>issue. What I have on hand is a the TR3A flywheel and a TR4 flywheel, but
>I think neither of those can be fitted with a 4A clutch, right?
>
>Part of the advantage of the later clutch would appear to be cost. I can
>now get a 4A 3-in-one Borg and Beck clutch kit from V-B for $119.95. It
>then seems like the smartest thing for me to do is find a 4A flywheel. Am
>I missing something in this plan?
>
>John Middlesworth
>
>
>
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