The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: A10Boy on 30.03. 2010 20:19

Title: Crankshaft material
Post by: A10Boy on 30.03. 2010 20:19

Hi Team, does anyone know the spec of the steel which the A10 large journal crank was made from please ?

I need it for the company who are looking at my spline repair.

Cheers

Andy

Title: Re: Crankshaft material
Post by: Desburnett on 30.03. 2010 22:36

EN 40B

Title: Re: Crankshaft material
Post by: MG on 31.03. 2010 21:23

Interesting, I hadn't thought that such detailed information was still available today.

EN 40b would be S235 carbon steel, isn't it?

Title: Re: Crankshaft material
Post by: A10Boy on 01.04. 2010 11:52

Cheers

 *smile*

Title: Re: Crankshaft material
Post by: terryk on 02.04. 2010 14:59

Hey show us a pic when you get the spline repaired. I have to do one myself at some stage.

Title: Re: Crankshaft material
Post by: Desburnett on 03.04. 2010 09:29

If its done correctly you shouldn't be able to see any difference in a repaired crank than an original.

The machine shop should mill out the existing splines to beond the wear band, lay down a deposit of nickel chrome weld, anneal. Turn to original diameters, re machine splines to original dimensions and possibly flame harden/temper the finished end depending on the ability to machine in the hardened or annealed state.

Des