Have had a couple of Lycoming IO360 camshafts that have had excessive wear on the lobes which was not detected until strip down for o'haul of the engine. By excessive I mean even I as an untrained person could look at it and say "WTF"?
The symptom was a decrease of power but with the usual checks of compression and prop condition, the engineers were unable to pinpoint the problem. After the first overhaul with a new cam fitted the engine went like a dream but the new camshaft supplied by Lycoming has shown the same problem when stripped down due to a prop strke. This is after only about 1000 hrs.
Is this a common problem with camshafts on the IO360? More importantly, what is Lycoming's position on these with regard to warranty?