Yeah, but this sort of damage happened before it got parkedDan,
Has this engine been sitting for awhile?
Boomer
I am not sure about oil but grease maybe. Can it use grease as a way of lubricant...all those nooks and crannies hold the oil better...like butter on an english muffin...
An (automotive type) compression test would have detected this failure as it was happening.What's the history of this engine? Or put another way, any lessons learned as far as what NOT to do?
Not enough known history. Removed from a Mooney a long time ago, probably because the screen was full of metal. Probably sat on a tire in a dusty corner for 20 years, while those with firsthand knowledge died or retired. Then barn-find fantasy entered the picture, and it became a valuable discovery...Look Bob, here's a nice Lycoming no one noticed...What's the history of this engine? Or put another way, any lessons learned as far as what NOT to do?
It's likely, although not my call. Bad one is original 1970's vintage.Are you going to use the new DLC-coated tappets in that engine? And, with that black ring visible around the face, were these already DLC parts? Hopefully the parts are better than Lycoming's spell checker...
No overhaul in the log.Gotta wonder if that Tappet face had been ground by a shade-tree “overhauler” and then not re-hardened….
My O-320 did that within 100 hours of such an "overhaul" by an A&P very well known in the experimental community, more for his legendary aircraft design work than for his engine rebuild business. He came to realize through my experience that it was not acceptable to "polish" pristine-looking cam lobes and tappet faces with crocus cloth and reinstall tappets in random positions vs. the holes they came out of. He rebuilt my engine properly a second time on his dime and it has run fine since for over a thousand hours at last report. We all learned something that day. Failure showed up at oil change - "is that used oil coming out, or silver roof paint?!" No notable effect by then on engine performance...Gotta wonder if that Tappet face had been ground by a shade-tree “overhauler” and then not re-hardened….
Local teardown, early 360 angle valve. Compare the lobe in the foreground with the next, or the one by my thumb.
View attachment 54704
Maybe the worst tappet face I've ever seen. Severely dished.
View attachment 54707
Some other issues too, but this is the wildcard in any buy.