O-360 A1A, ~1600 hrs. What's the white checking on the mating surfaces? I only see this on the exhaust valve on one cylinder. Everything else seems fine, no asymmetric pattern or green on the valve face. Some symmetrical yellow however. Thoughts?
As an aside, is there a good reference with photos that could help with evaluating what we see in borescope inspections? I've read articles such as this one from AOPA that show the basic exhaust failure modes but nothing showing things like valve seat wear etc.
As an aside, is there a good reference with photos that could help with evaluating what we see in borescope inspections? I've read articles such as this one from AOPA that show the basic exhaust failure modes but nothing showing things like valve seat wear etc.