Thread: Milky Oil
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Old 11-08-2019, 10:26 PM   #126
STB
Guru
 
City: Gulf coast
Join Date: Aug 2016
Posts: 2,271
Les,

A lot of sorting out has happened over the life of the thread.

In particular, per oil analysis, the oil is polluted with glycol-free water (not coolant) in a freshwater boat (no salt to also check for in the oil) without an oil cooler (no place where oil and raw water come near each other), and, I think, without any oil in the coolant. Additionally, the boat has a recent history of extended cranking (an opportunity for the raw water pump to push water into the oil), and of cruising without the generator running in a model of vessel reported to have problems with water backing up the generator exhaust while cruising, but is equipped with an exhaust flap for whatever such is worth.

So, the problem has nothing to do with the coolant or coolant loop, and there is no apparent way for the water to have gotten into the system via the raw water loop, but there are a couple of high probability ways by which it could have gotten into the system via transient conditions.
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