The Crank Sleeve (Prt No 40-0042) which runs inside the Crank Bush (Prt No 40-0389) on my 1960 BSA C15 can rotate on the Crank shaft and is a sliding fit.
Is this normal? there does not appear to be excessive wear between the sleeve and the bush and as both are quite pricey (if available) so a little reluctant to buy new.
Help appreciated.
Quote from: Mascott on 18 Feb, 2020, 10:28
The Crank Sleeve (Prt No 40-0042) which runs inside the Crank Bush (Prt No 40-0389) on my 1960 BSA C15 can rotate on the Crank shaft and is a sliding fit.
Is this normal? there does not appear to be excessive wear (Total Lift around 0.05mm) between the sleeve and the bush and as both are quite pricey (if available) so a little reluctant to buy new.
Help appreciated.
no, normally the bush is a press fit on the crank. as a double check there is a bush withdrawl puller so if it was meant to spin free they wouldnt make a tool.
you need a micrometer to check the diameter, if the bush spins while running it can cause more wear to the crank.