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Milky oil, can't tell if it's fuel or water

dghahn

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Boat Make
Yamaha
Year
2011
Boat Model
SX
Boat Length
21
it is 1052cc, so it must be an MR1, but for the life of me i couldn't find the drain plug. But, after four pump outs and oil and filter replacements with cheap oil it is now showing clear, no milky residue. I also checked each of the injectors, and they are firing and not sticking. I will run it once more tomorrow without water and if the oil looks good i'll take it for a short ride to see if the milky oil returns.
 

Cobra Jet Steering LLC

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Year
2014
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well sounds like you have it handled
 

dghahn

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sure enough, after a 15 min. ride the oil looks like chocolate milk. Any ideas on simple things to check before i pull the engine and start tearing it down? I want to thank Cobra Jet and everyone else for the help on this. It's great to know there are others out there that have been there, done that and are willing to share ideas.
 

Cobra Jet Steering LLC

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I just wonder if you don't have a blown head gasket or something causing water to get in the oil and that is why they sold the boat. Can you check the hull id number with your local dealer to see if they brought it in for service and were informed of it. I think you need a compression check and a leak down test honestly so you know for sure.
 

sunbyrned

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Yamaha
Year
2012
Boat Model
242 Limited S E-Series
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Before you dismantle the engine, I would encourage you to look for evidence of water getting into the engine compartment and into the engine from the previous owner. One possible way to see if the water level rose above the air intake is to lift the hatch of the gas tank and see if you can see a waterline around the edges of the compartment higher than the intake. You might also be able to see debris both in that compartment and the engine compartment. Just a thought, because if you can prove water got into the engine from a previous owner, you may be able to return it or have insurance help out. If you dismantle on your own though, that may negate those options. A long shot I guess, but something to consider.
 

dghahn

Member
Messages
10
Reaction score
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Boat Make
Yamaha
Year
2011
Boat Model
SX
Boat Length
21
I did a compression check and had between 145-150 psi in each cylinder. No evidence of water in the engine compartment or near the gas tank. Also, the other engine is fine. I may do a leak down test, which would at least tell me if it's a valve or head gasket issue, but there is also a distinct knock when it's running so i may just pull the engine.

The interesting part is looking at the bottles that i put the oil in(attached), the one on the left is from 7 days ago and has totally settled and doesn't show a separation of oil/water, the middle is 3 days ago and the right is 2 days ago. They all started completely milky. All continue to settle more and more each day. I just expected to see a distinct separation of oil and water.20190610_212034.jpg


Ultimately i am delaying the inevitable. I just need to start pulling it apart and see what i find. I'll post back with what i find.
 
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