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Old 10-05-2019, 10:52 PM   #21
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City: hawaii
Vessel Name: #31
Vessel Model: ex-Navy MUB 50 fish/cruise
Join Date: Aug 2013
Posts: 708
The fact that the oil and water are not mixed is a big clue, pretty much eliminates the raw water system as a suspect. (Unless, as mentioned above, the motor lives below the waterline)
For my $.02 worth, How about a bilge pump failure or a delayed startup of same?
The ER could have flooded, with a sticky float switch kicking in late.
The water could have then entered through the dipstick port.

You can lead a horse to water,
But you can't make him ski...
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Old 10-12-2019, 06:03 AM   #22
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City: Rockland, ME
Vessel Name: Leap of Faith
Vessel Model: Mainship 34. Mk III
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Posts: 30
Air pressure test

The ONLY other possibility is cracked block -doubtful. Air pressure test it will locate the leak (my guess is the inter cooler)

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