Annoying knock from camshaft front pulley area

[Lowbarn]

Thanks for that. 
I think I’ll go for the butcher approach using my dremel in the first instance.
The engine looks to have been fairly recently refurbed so nibbling round the problem sounds a good approach.

I think if the block needs to come off I’ll have the complete engine checked / overhauled.
This might be challenging to meet the centenary bash in July!


I presume the square bolt can be replaced with a standard bolt and lock nut?

Richard.