Print Page - Question on A7 cases..

Title: Question on A7 cases..
Post by: JoelCardoso on 09 Jan, 2023, 13:44

Hi..
Can somebody tell me why is this hole in the case off the BSA A7..
Congrats
Joel Cardoso

Title: Re: Question on A7 cases..
Post by: DAVE BRADY on 09 Jan, 2023, 13:57

Hi Joel,

This is the outlet for the timed breather. If look on the other side there is a part that looks like a top hat that fit on a peg on the cam pinion. As this turns it lines up a passage way that allows the pressure in the crank cases to be eased as the pitsons come down the bore. If you blow through it you will see how it all lines up.
Do you have a workshop manual?

Dave.

Title: Re: Question on A7 cases..
Post by: JoelCardoso on 09 Jan, 2023, 14:27

In my BSA some genius was blocked this hole...
I already buy the Haines manual but i'm waiting to receive it.
Joel.

Title: Re: Question on A7 cases..
Post by: DAVE BRADY on 09 Jan, 2023, 16:49

Hi Joel,

The breather passes through the crank case to the other side. The holes are marked with an arrow.

Dave.

Title: Re: Question on A7 cases..
Post by: JoelCardoso on 09 Jan, 2023, 17:14

Thanks for the explication..
Joel

BSA Owners' Club Workshop Discussions

The BSA Workshop => Twins => Topic started by: JoelCardoso on 09 Jan, 2023, 13:44