3.0 Oil in water after sitting???????

[jasonsnova]

Ok guys help me figure this out! this spring i bebuilt the 3.0 in my boat, block sleeved,bored .040 over etc complete rebuild, anyway after the rebuild it ran perfect all summer, no issues. well last time i used it was last week of august and it has been sitting since, so last sunday i went out and figured i'd winterize it ...i start it up on the muffs let it run for about 15 min so i can do the oil change...then i check the oil it took in probally 2-3 qts of water and my oil is all milky, it still ran fine. I just cant figure why it would do this it was fine till i ran it on the muffs so the problem happened while sitting....my best guess is either head gasket went bad, sealant on headbolts let go, or bad manifold.... now i have to flush the crap out of the engine to get all the oil/water out before i winterize ....
Anyone ever have this happen? i do use it n salt water maybe corrosion?? doesnt make alot of sense.. any suggestions would be great!

 

[Knightgang]

Re: 3.0 Oil in water after sitting???????

I do not know that much about the setup in an I/O, but is it possible that the intake manifold gasket let go somewhere. I have this happen to a V-6 in a car. Intake mnifold gasket leaked and dumped 1-2 gallons of water into the crankcase.

For the flush, fill the entire crankcase with deisel fuel then drain. When you refill woth good oil, you will be good to go...

 

[freeone]

Re: 3.0 Oil in water after sitting???????

what kind of cooling system. if closed you can do a pressure test on the cooling system. leakdown and compression test on the engine to narrow down your problem. how do your plugs look?

 

[jasonsnova]

Re: 3.0 Oil in water after sitting???????

i havent done a comp test yet , but it did run well. i will do that sunday, i already got diesel fuel to do a flush with,it isnt a closed cooling system so i cant do a leak down test on it that way. just doesnt make alot of sense. I am kind of thinking manifold or manifold gasket, when i rebuilt it i reused the old manifold....
also oil has been draining for days...oild mixed with water comes out my drain hose like molasses and i dont have a oil pump that goes down through the dip stick...
big pain in the *****!!!!!!!

 

[Bondo]

Re: 3.0 Oil in water after sitting???????

it isnt a closed cooling system so i cant do a leak down test on it that way.

Ayuh,... Is there water in the water jacket,..??
If so, Drain it,... Block off a few hoses,+ Put the Air to it....You'll Hear where it's leaking...