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Old 10-04-2019, 07:35 PM   #17
Brooksie
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City: Cape Cod, MA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 1,306
I assume, based on model number, this is a vertical engine. I think you have checked/tested the proper items so far. The oil cooler is the most likely suspect and if you trust whomever tested it that has been eliminated.
Barring siphoning, ask yourself, where is the static waterline on the engine? This could help eliminate other items.
If no mistake or sabotage, what about a large wake from a passing boat running up the exhaust and into the turbo, manifold & cylinders and then filtering down, by the rings over time, into the crankcase. As an example, many boats that have run for years without problems, fill their crankcases when anchored in a seaway in the trades. Water enters the exhaust as usual but without a proper loop aft, finds its way to the engine, filling a waterlift muffler even and eventually the engine as the vessel hobbyhorses at anchor. The same situation may have briefly occurred at his marina.
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