The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Frame => Topic started by: manxman on 15.04. 2020 17:56

Title: A10 plunger rear brake drum spring ring
Post by: manxman on 15.04. 2020 17:56

Does anyone have knowledge of the snap/spring ring that retains the brake drum/chainwheel bearing ?  Part number ? Source ? It looks like the ring that retains the gearbox oil seal. I can find nothing in my parts book.

Title: Re: A10 plunger rear brake drum spring ring
Post by: Swarfcut on 15.04. 2020 18:31

 The assembly goes bearing, shim, retaining (snap ring).

 Shim is a circular grease retainer for the original open bearing. Shim part no 67-6072, just a thin tin can circular pressing with a slightly raised centre.

 Snap ring part no 67 6067. Yes, similar spring steel.  Nothing special. Any modern wide internal circlip to the locating groove depth and width will do.

 If you use a modern sealed bearing and don't have the shim, then a substitute ring will be needed to bridge the gap between snap ring groove and bearing outer race. Otherwise the bearing will not be positively retained laterally. Easier to see than explain.


 Swarfy.