Urp99
Well-Known Member
Looking for some opinions here ...
I'm helping out a friend doing a top on the IO-540's in his Aztec. Long story, but I got involved after everything was disassembled, gotta love taking over half way through a project like this
Anyway, after inspecting the bottom end I found some very minor spalling on the followers and the associated strange wear marks on the camshaft. It's nothing you can feel with a finger or fingernail, but you can feel 'roughness' when you slide a pick across the face of the follower. Another mechanic has looked at it and thinks the case should be split, cam re-surfaced or replaced, and new followers installed ... I'm of the opinion that this type of wear is normal for a mid-time Lycoming, and that there's a lot of life left in the bottom end for an airplane that's flown recreationally. I'm also concerned that if we keep digging into the engines we'll keep finding things wrong, and end up needlessly majoring this guy's engines.
Any opinions from the engine experts out there? I want to help this guy out, and get him back into the air without breaking the bank, but I don't want to see him tearing into the engines again soon either ...
I'm helping out a friend doing a top on the IO-540's in his Aztec. Long story, but I got involved after everything was disassembled, gotta love taking over half way through a project like this
Anyway, after inspecting the bottom end I found some very minor spalling on the followers and the associated strange wear marks on the camshaft. It's nothing you can feel with a finger or fingernail, but you can feel 'roughness' when you slide a pick across the face of the follower. Another mechanic has looked at it and thinks the case should be split, cam re-surfaced or replaced, and new followers installed ... I'm of the opinion that this type of wear is normal for a mid-time Lycoming, and that there's a lot of life left in the bottom end for an airplane that's flown recreationally. I'm also concerned that if we keep digging into the engines we'll keep finding things wrong, and end up needlessly majoring this guy's engines.
Any opinions from the engine experts out there? I want to help this guy out, and get him back into the air without breaking the bank, but I don't want to see him tearing into the engines again soon either ...