BSA Owners' Club Workshop Discussions

The BSA Workshop => Twins => Topic started by: Terry hayton on 29 Jul, 2019, 11:11

Title: a10 plunger clutch play
Post by: Terry hayton on 29 Jul, 2019, 11:11
when fitted my clutch has a slight wobble the centre is tight and new bearings but wobble seems to be from chain wheel to thrust washer is it normal .
not sure if i am just being stupid but cant work it out, i have replace centre and bearings and all a tight fit when put together,any advice would be good or ideas, cheers terry
Title: Re: a10 plunger clutch play
Post by: Jackson on 29 Jul, 2019, 15:27
Not sure that it's OK but mine is much the same.
Adrian.
Title: Re: a10 plunger clutch play
Post by: Jim S on 29 Jul, 2019, 23:46
Is it a 6 spring clutch?
Title: Re: a10 plunger clutch play
Post by: MALCOLM.JOHNSON on 08 Aug, 2019, 21:33
I had a similar problem which was cured by carefully examining the two half round abutment pieces ( 67-3251 )on the gearbox mainshaft. I noticed that when put together as they might be on the shaft, they were not EXACTLY the same, but rotate one 180 degrees and they became a perfect match. Assemble the clutch again with the pieces matched like that and it was problem solved. When assembled unmatched it held the bearing thrust washer ( 67-3276,77,78 ) slightly skewed. Note this only applies to plunger models, not swinging arm models. I presume the parts were originally made as a complete ring and then cut in half? Unless both faces are the same a slight mismatch can easily occur.