Hello 170 members - I've read this very informative forum for years but have never posted. I'm hoping for some advice on the following:
'52 170B with mid-time C145. Recently at annual one cylinder was replaced with a new Superior cylinder. After 10 hours break-in per Superior's recommendations, oil was changed and there was a fair amount of fine bronze colored flakes (non-ferrous) in the oil filter (Stratus spin-on oil filter installed). After new oil and filter and 10 more hours of flying another oil change found the same or slightly more bronze flakes in the oil filter. My mechanic inspected the rocker arm bushings on the new cylinder which looked ok and then inspected the rocker arms on the other 5 cylinders which looked ok. Engine is running fine with good compressions and was not making metal before the cylinder replacement.
My questions are:
Is bronze in the oil common after a new cylinder? If so how much could be considered normal and for how many hours after cylinder replacement?
Other than the rocker arm bushings, what else in the engine would be producing the bronze flakes?
Thanks in advance for any help.