The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 1946-1950 => Topic started by: fastharry on 25.03. 2018 12:58

Title: Tappet guide
Post by: fastharry on 25.03. 2018 12:58

Can anyone tell me why there is a tread on the 2 outer tappet guide blocks?

Title: Re: Tappet guide
Post by: trevinoz on 25.03. 2018 21:11

I use the thread to pull the guides from the case.
I guess that is the reason they are there.

Title: Re: Tappet guide
Post by: RichardL on 25.03. 2018 22:07

What engine is that. Should I guess long stroke?

Richard L.

Title: Re: Tappet guide
Post by: Greybeard on 25.03. 2018 22:11

I didn't recognise it and not wanting to look a prat I've been waiting for someone else to ask!

Title: Re: Tappet guide
Post by: fastharry on 25.03. 2018 22:57

Its a basket case A7 from 1948 im trying to put together for a friend. But i cannot find much info on this engine,

Title: Re: Tappet guide
Post by: trevinoz on 26.03. 2018 21:37

This is the long stroke section,fellows.

Title: Re: Tappet guide
Post by: RichardL on 26.03. 2018 23:42

Quote from: trevinoz on 26.03. 2018 21:37

This is the long stroke section,fellows.

That fact is.visible in the mobile version,.but very subtle. You have to.look for it, which I obviously didn't. Thanks.

Title: Re: Tappet guide
Post by: vinver on 13.04. 2018 03:48

Puller threads to remove guide block.  The center double guide block is clamped between the cases but the outer ones are pressed in place. Unlike the A10- based engine , the early long strokes have separate guide blocks .