some more updates engine this time .
whilst one of our engines was away being looked at we decided to have a inspection of our R975 C1 that is destined for the sexton eventually, to see if it was viable to drop in our sherman to get us running for cosby.....as you'll see this wont be happening .
After initial visual inspection , setting the timing and having a general fettle we got it running but it was blowing oil out of the crankcase breather and exhaust joints on cylinder 7 & 8 .
So we stuck a camera down the bores to checked for heavy scoring seemed ok , then did a compression test which gave us an average of 90 psi across 8 cylinders but number 7 cylinder was reading 235 psi !! nothing left but to remove cylinder and find out what was going on with the rings etc .if you have worked on one of these radial you'll appreciate what a swine it is to just remove a cylinder .but however after a morning of knuckle and hand bashing all was revealed .
cowling off
then we get to the piston :cry:
sadly all the pistons appear to be in this state, suspect either crankshaft counter weight siezed and has shaved bottom and scraper ring off each piston or a badly fitted retaining circlip has come adrift and broke skirt of one piston then continued to eat its way round crankcase and pistons . I know more when i strip rest of engine , this engine wont be in for cosby show.
there is light on the horizon tho, our C4 engine is back in our hands now so hopefully fingers, legs and arms crossed it will be ready to go.
positive mental waves baby..........
cheers
Iain