There are two other ways to get water in the oil pan - from the exhaust system:
1) over cranking with the seacock open so that water fills the water lift muffler - and exhaust manifold - without exhaust pressure to blow it out the transom. Water can then run down an open exhaust valve and into the oil pan.
2) usually at anchor, having a big wave (or wake) hit the transom and push water up the exhaust hose, filling the water lift and exhaust manifold and into the engine.
Edit: Oops - read your original post more closely, and what I described for water incursion is obviously not happening in your situation. Will keep for the sake of completeness, but please disregard in this instance.
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Jim Zeller
1982 Catalina 30
Kelleys Island, Ohio
Last edited by zellerj; 07-12-2018 at 08:14 AM.
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