I found there seemed to be considerable camshaft end float when checking as per Rupert's book. I then discovered that the outer camshaft bush was loose in the inner cover, which appears to be due the outer dimension of the bush being considerably less (0.9075") than the correct 0.9155". So with a new bush obtained I went back for another look, and was musing on what the camshaft actually bears against end to end. And it didn't really seem right at the crankcase end. (See picture.)
Having now seen photos of the inner camshaft bearing, it appears the entire lip has disappeared!
Unless - does the bush lip fit into a recess? So it is supposed to be flush?
Or has it been installed backwards (with the lip in the crankcase)?
There is some evidence of the side of the cam lobe scuffing the crankcase above the bearing.
I've rewritten this to remove verbiage.
On a C15F, does the inner camshaft bush fit into a rebate such that the outer face is flush with the surrounding aluminium? Or in my case, slightly recessed?
Or to put it another way - is the inner camshaft bush in the picture positioned exactly as it should be?
The bush flange fits into a recess/counterbore in the crankcase. When fitted, the bush should be flush with the crankcase around it. When new the fitted bush and surrounding Ali were machined together
Thank you!
I have contacted RTS, as I now realise that the inner camshaft bush is excessively worn, the outer is worn and loose, the end float is excessive and my NOS inner bush will certainly need line reaming as the camshaft won't go in at all.
Just in case they are booked up - are there any other respected BSA engineers about? Ideally somewhere in Yorkshire!
If you need a BSA unit single engineer in Yorkshire, then contact Mark Cook at PES in Goldthorpe. He has specialised in these engines for quite some time. It is easier to get hold of him by email. HTH
https://pesltd.uk/?canvas=contact-us