The BSA A7-A10 Forum

Technical => A7 & A10 Engine => Topic started by: bikerjohndavies on 17.12. 2019 12:50

Title: Small end bush outer diameter
Post by: bikerjohndavies on 17.12. 2019 12:50
Does anybody know the standard outside diameter for a A10 small end bush. I have 2 that I want to use but one measures about 7 thou larger OD than the other. Not sure if its just bad manufacturing or maybe one is oversized.
Title: Re: Small end bush outer diameter
Post by: JulianS on 17.12. 2019 13:47
This table from the 1966 Alpha Bearings catalogue may help.

The A10 bush is SE109 right at the bottom ofthe photo.
Title: Re: Small end bush outer diameter
Post by: a10rgs on 17.12. 2019 14:02
Or have a look at BSA Service sheet 702
Title: Re: Small end bush outer diameter
Post by: bikerjohndavies on 17.12. 2019 18:33
Thanks guys, the Alpha list is a great help. The service sheet 702 only shows the ID and I need the OD.  Have now measured them with a micrometer and the smaller one measures .878 so standard whilst the other is 10 thou larger. At least now I know what I have to work with. Cheers,