> As many of you know, I am rebuilding my '60 TR3A engine. I also bought a
> spare engine that was from a TR4 or 4A, but, 'it never ran right' the owner
> told me. This motor had a different flywheel than the TR3A engine had and
> didn't have a starter. This mystery flywheel was a little bit lighter weight
> and had more teeth AND IS A LITTLE LARGER IN DIAMETER than the TR3A's
> flywheel.
>
> Later I somehow acquired a Triumph shrink-on ring gear at the parts auction of
> VTR Richmond (94?). This shrink-on ring gear will fit on the mysterious
> flywheel but also has the same distance between it's teeth as my 60 TR3A
> flywheel has. The bottom line is this:
> Can I use either flywheel on the TR3A engine- one of them is about an inch
> larger in diameter? I am not totally stupid, I know I'll have to make some
> kind of adjustment for the starter...........
The earlier TR2-3A did have a very slightly larger diameter ring gear than the
later engines did, but the tooth spacing was the same AFAIK. I don't know what
your mystery flywheel is from, so I can't say how well it would work on your TR.
Spacing front/rear is also important and perhaps it's different; plus of course
you would need a clutch to fit it. I'm also having a hard time understanding
why you are "looking for trouble".
However, it's not hard to use the earlier TR2-3A flywheel on a later TR3A-4A
engine, all you have to do is use the matching clutch and starter. The early
starter sticks out more though, so it will interfere with most aftermarket
headers, or the stock TR4A exhaust system. An alternative to this problem is to
use one of the gear-drive replacement starters (to match the flywheel of
course).
Randall
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