Triumph clutch rebuild and adjustment advice, please.

Triumph clutch rebuild and adjustment advice, please.

Postby Corona850 » Sun Apr 05, 2009 3:27 pm

The clutch was slipping on my 1971 TR6R. I replaced the friction plates and springs. Now, the clutch really snatches. It's like an on-off switch with very little slip area. If I don't fix it I see a future of serial, unintended wheelies :oops:

I am pretty sure the steel plates are a bit warped, When I picked up the friction plates from the shop I was told to stack the steel plates, then press down on one side and see if they lift and spread (concertina) on the opposite side. Well, they do, a bit, but I thought they could be re-used. However, I am now going to replace them (got some replacements coming).

I thought I got the springs adjusted uniformly by eye. I couldn't see any obvious wobble. When I replace the steel plates I intend to use a dial gauge to ensure the pressure plate is lifting truely.

What else should I be looking for? And, how far should the spring adjusting nuts be screwed on initially? The manual implies that the dome should be flush with the end of the screws, but that seems like it would really crank the springs down tightly and make the clutch really heavy to operate.

Any advice will be gratefully accepted. Thanks.
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Re: Triumph clutch rebuild and adjustment advice, please.

Postby L.A.B. » Sun Apr 05, 2009 3:37 pm

Corona850 wrote:The clutch was slipping on my 1971 TR6R. I replaced the friction plates and springs. Now, the clutch really snatches.


What make are the plates?

Are you sure you have been supplied with the correct springs? As 750 springs are stiffer, they are also a different length to 650 springs.
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Postby Corona850 » Sun Apr 05, 2009 5:54 pm

"What make are the plates?" -- Hhmm. Don't know! They are replacement for the standard Triumph part, and they looked the same. They are not Barnett, or some other aftermerket upgrade. The invoice describes them as: "57-1362A Clutch Plate, Bonded steel, Tri Twins/BSA unit twins (68-3267) 17-E" So, I don't know the actual manufacturer.

I'm pretty sure the springs are 650 items. Their length was 1-13/16". The old ones that came out were about 3/16" shorter, but then they were old, worn, and showed some corrosion.

I bought the stuff from a long standing Triumph shop (Moore's Cycle Center) that's been around since the 60s or so. That's not to say they couldn't have sold me the wrong stuff, but I think it's unlikley. I gave them the list with part numbers form my old parts book (i.e. has the old-style letters and numbers mixed).
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Postby L.A.B. » Mon Apr 06, 2009 12:03 pm

Corona850 wrote:They are not Barnett, or some other aftermerket upgrade. The invoice describes them as: "57-1362A Clutch Plate, Bonded steel, Tri Twins/BSA unit twins (68-3267) 17-E" So, I don't know the actual manufacturer.





The parts supplier references to 57-1362"A" I found relating to the plates are that the A either means an alternative brand or they are alloy plates?




Corona850 wrote:"I'm pretty sure the springs are 650 items. Their length was 1-13/16". The old ones that came out were about 3/16" shorter, but then they were old, worn, and showed some corrosion.


They certainly sound like 650 springs, as 750 springs are 1.75".

I can only suggest that you slacken off the spring retainers a couple of turns and see if that makes the clutch action any better, but without introducing any clutch slip?
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