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#828257 10/30/20 5:21 am
Joined: Nov 2002
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I am expecting the reply - don't do it! I have just acquired a pile of parts and have set myself the challenge of making a running bike from it. essentially 1968 Trident frame, most of a 650 engine & forks. I have a very good late 60s crank there, however need to mate it with metric timing side cases. So my question here is do I make a spacer for the crank to fit inside the bearing, or is there a special size bearing available anywhere?


1968 T150/TR6R
1970 TR6
1970 TR6C
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I did this nearly 10 years ago and documented it on my blog. 1 sleeve and a spacer.
Motor Internals

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Thanks Excalibur, I take it the sleeve is some sort of hardened steel?


1968 T150/TR6R
1970 TR6
1970 TR6C
Joined: Sep 2011
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No, nothing special as I recall it. It was made in my workshop lathe. Firstly I bored a bigger piece of steel so it was a press fit on the crank. Then after pressing it on, mounted the crank in the lathe ensuring it spun true before machining it to fit the bearing. It was only after assembling bottom end that I realized the crank wasn't central to the 2 bores, hence the need for that spacer. It was slightly too far toward timing side so rod little ends were clashing with the piston gudgeon/wrist pin bosses. It made for a tight spot as crank rotated and that's how I found the problem, luckily enough for me.
That crank did 2 seasons before fitting a metric bearing crank which did another 2.

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I have just rediscovered the need for the spacer as the metric bearing is 19mm wide, the old bearing 13/16 (= 20.6). That means the clamping washer won't be able to do anything! I take it the spacer goes on the crank before the bearing? I will need to hunt out something to do the job now..... Other wise the rolling chassis is all complete less tank and wiring, with plates made ready to fit the engine once its built.


1968 T150/TR6R
1970 TR6
1970 TR6C
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I hadn't noticed this thread, are you using the later 60-7362 3 piece bearing? It is much superior to the original 60-4167. The dimensions are the same, so ditto the spacer.

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Its a 6306 bearing


1968 T150/TR6R
1970 TR6
1970 TR6C
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That is the slightly later, better quality bearing. The 60-7362 is a combined ball and roller bearing, which should take more load, and was fitted fron 1981 onwards. The story goes that the initial testing of the T140 had the metric bearing as fitted to the late T120 failing early, so rather than fixing the bearing, the cams were changed to de-tune the engine. Allegedly, a better quality bearing will take the load of a re-tuned T140, despite it being smaller both in width and radially - the 6306, but I go for the 3 piece job.

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I managed to locate a 1/16" thickness washer at the local bolt store, which hopefully I can use as the spacer. I will need to check the fit with the clamping washer, fingers crossed!!


1968 T150/TR6R
1970 TR6
1970 TR6C
Joined: Nov 2002
Posts: 670
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I had to grind the washer thickness down a bit, a bit tedious with a lot of vernier checking, but with a trial fit of crank & cams it all looks good. I can start the engine reassembly now...


1968 T150/TR6R
1970 TR6
1970 TR6C

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