The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: Dean on 16.09. 2015 17:49

Title: Type of timing side bush?
Post by: Dean on 16.09. 2015 17:49

I need to get a timing side bush for a crank that has been ground -20 thou. and I have two questions.
1. Are steel backed bushes significantly better that those that ar just solid bronze?
2. I will probably need to get the bush finished to fit the crank. If I were to get one for a -30 journal I will be sure that it has enough metal to machine to fit the journal rather than just getting a -20 and hoping it has. Can anyone advise if this is the way to go and if there ar any problems with ths route

Your wise words awaited in anticipation.

Title: Re: Type of timing side bush?
Post by: wardleybob on 16.09. 2015 19:21

Hy Dean I reline metal back bushes. Just grind the crank till its round it does not mater the size. Then I line bore the cases.to suit.pm me if your stuck.

Title: Re: Type of timing side bush?
Post by: Dean on 17.09. 2015 18:05

I have just done a search and and found this topic was well covered previously. *red*
The concensus seems to be that either will work equally well but non-steel backed ones are cheaper.

Thanks for your offer Wardleybob, I'll get in touch if stuck.