Hi,
I have just got my 1960 A10R going after an engine rebuild. It is throwing a fair amount of oil out of the breather hole in the crankcases. It started doing this really badly when I changed the oil pump before the engine rebuild. In fact this was one of the reasons for the rebuild , apart from the fact everything was worn out.
I had the crank ground and new main roller and plain bearings, a new cam, and big end shells. The bottom end was machined ant put together by a specialist. sludge trap was also done and the cases were hot washed.
I put the rest of the engine back together and now starts and runs lovelly apart from the oil that is liberally dripping down the back of the engine! Its okay at tick-over but starts after a run.
I tried the old oil pump and it it is just the same. Also I replaced the oil pressure release valve with a SRM one, no difference.
Any help would be gratefully recieved!