It is a brand new, Lycoming YIO-390-EXP33 purchased from Van's. It starts and runs great, but somewhere near the #1 cylinder (right front) I have a small oil leak. I don't see the obvious source, but it has a small puddle of oil on the engine case in front of the baffle, specks of oil on the back of the baffle and a small amount of oil drips on the engine case.
My first thought was that it was the cylinder hold down bolts, but my mechanic buddy checked the torque of all eight bolts and they were fine. I sort of think it could be one of the valve pushrod tubes though I don't see oil specifically there.
Lycoming tech support (Tyler) says it is covered under warranty, but I still need to figure out how to get it fixed. My mechanic says pulling the cylinder is about 5 hours of work minimum so I don't want to go there unless I have checked everything else.
Lycoming also suggested the crankshaft seal may be an issue but we checked that and it was OK.
I considered the propeller (Whirlwind 74HRT) but if that were the case the oil should be on both sides of the engine. If it were the prop governor it would be on the left side rather than the right.
Any comments, suggestions appreciated.
thanks,
My first thought was that it was the cylinder hold down bolts, but my mechanic buddy checked the torque of all eight bolts and they were fine. I sort of think it could be one of the valve pushrod tubes though I don't see oil specifically there.
Lycoming tech support (Tyler) says it is covered under warranty, but I still need to figure out how to get it fixed. My mechanic says pulling the cylinder is about 5 hours of work minimum so I don't want to go there unless I have checked everything else.
Lycoming also suggested the crankshaft seal may be an issue but we checked that and it was OK.
I considered the propeller (Whirlwind 74HRT) but if that were the case the oil should be on both sides of the engine. If it were the prop governor it would be on the left side rather than the right.
Any comments, suggestions appreciated.
thanks,