Engine Oil Contaminated with Water 2007 Supra 24SSV with a 340 Cat

Hello All!

I need some help. I am getting a late start this season and went to change the oil in the boat. I found the oil was contaminated with water in both the oil sump and the oil filter. I am looking for how I got water in the oil. Online searches tell me it could be one of numerous issues: a blown head gasket, cracked engine block or cylinder head; faulty intake or exhaust manifold gasket; leaking water pump; engine oil cooler failure; and condensation.

Based on how milky the oil was and the fact that I found contamination in the oil filter, I don't think it is condensation or water seeping past the oil pan gasket. My first thought is the oil cooler is leaking, but for the life of me, I can NOT locate the oil cooler on this engine. I found the transmission oil cooler, but not the engine oil cooler. Does anyone know where the oil cooler is on this engine?

One note: The only thing I did differently last year while winterizing was that I changed the thermostat. Is it possible this somehow caused oil contamination (I don't see how, but...)

Thank you in advance!

Rodger

It most likely does not have an oil cooler. I do not see how changing the thermostat would get water in the oil, it sounds like a failure in the engine. There have been cases of exhaust causing the mixing but not as often.

Quickest way to figure it out is to remove the intake, that way you can see in the valley and check the intake.

Quote:

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Originally Posted by h2o-ski

It most likely does not have an oil cooler. I do not see how changing the thermostat would get water in the oil, it sounds like a failure in the engine. There have been cases of exhaust causing the mixing but not as often.

Quickest way to figure it out is to remove the intake, that way you can see in the valley and check the intake.

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Well, that was what I was afraid! Thank you for the information!