Author Topic: Anyone seen one of these? (breather pinion)  (Read 2950 times)

Offline unclemeat

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Re: Anyone seen one of these? (breather pinion)
« Reply #15 on: 28.11. 2007 19:31 »
Just to comment on bsa-bills query...You said that when you tightened up the nut, the camshaft locked up, well....that could be an after-market woodruf key that is protruding a little more than it should, and is rubbing/pressing on the bronze bush when its all tightened up. I had exactly the same problem, and had to shave a little height and length off the key. It is still a snug fit in both shaft and pinion with plenty of land to engage, but now the nut can be fully tight with no locking up of the shaft.
BSA A10 GOLDEN FLASH 1954
CHANG JIANG COMBO 1968
TRIUMPH THRUXTON 2007

Online bsa-bill

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Re: Anyone seen one of these? (breather pinion)
« Reply #16 on: 28.11. 2007 22:03 »

Now there's something I must check Unclemeat while the engine is still on the bench

All the best - Bill
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline octane

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Re: Anyone seen one of these? (breather pinion)
« Reply #17 on: 21.07. 2008 17:07 »
...You said that when you tightened up the nut, the camshaft locked up...

Had the same problem:
the place that the camshaft driving pinion 'rest' up agains on the camshaft
was 'lower' than the bronze bushing,
, and the woodruff touched the bushing as well.
 (you can see on the pic that I've filed down the end 'pointing' away.)




There was obvious scrape-marks on the pinion
and I has a friend remove a bit (more) material (of cause not right around the hole)
so it would run freely after being tightend up fully.



I thougth that perhaps it was because I
installed a new camshaft (from SRM) that was ever so slightly different in that place.