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Old 01-31-2021, 06:06 PM
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avrojockey avrojockey is offline
Join Date: Aug 2019
Location: Appleton, WI
Posts: 347

It is definitely coming from the thru stud at the 1-1:30 position on the #2 cylinder. I cleaned everything up again until you could eat of it and inspected all around with a mirror...definitely the stud.

So I'm going to give Divco a call and ask for advise. I can only assume that removing that cylinder and through stud to inspect and possible do the Lycoming SI for oversized studs.

From my research and understanding...there's only 2 possible sources of oil: the case split where the interference fit on the stud is, or a crack in the webbing that joins high pressure gallery oil to the thru stud cavity.

Anyone else have insight?
Tim Holmes
Appleton, WI
RV-9A N904DC
2019-2021 Dues Paid
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