May be partially pulling a jug to peak at the cam/etc for corrosion on a O-320. Since the case is segregated in Lycomings, and if you can only pull one cylinder, what half would like see corrosion first? Does it matter?
done it a couple of years ago... you’ll need to pull 2 cylinders to check all the cams. We carefully pulled the jug just far enough, piston still engaged, and used a mirror and flashlight to check the camshaft. Good luck!
Ditto what the others have said.
You may be pleasantly surprised.
Back in 2015 we pulled jugs on an O-320.
The engine was last overhauled in 1980 by Clydesdale.
It was 1200 SMOH, Chrome cylinders, and only flown about 10 hours per year for the last 5 or 6 years. The plane was kept in an open hangar down in Ohio (no door).
Two A&P's were present and to our surprise the surfaces were all mirror like.
Both A&P's said close it up and fly it to TBO. Don't mess with it.
400 hours later at 1600 SMOH she is still running well. Oil analysis shows normal for an engine of that age/hours.
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Checking Cam 0-320
Linear Mode
