mercruiser with water in oil

[vogelsnest]

I read this forum almost every night because you all always teach me something new. Thank you in advance for helping me out with this question.I recently purchased a boat with a 1983 2.5 120 horsepower mercruiser with a alpha one drive. I did all the normal things in preparing a motor and drive that had been sitting for a while. I started it up on a hose several times and it ran well. The last thing that I did to it was change the impellar and drive fluid. After putting it back together I started the motor. This is when my problem developed. After running it for 10 minutes at idle on the hose I shut it off to check the oil. I discovered several quarts of water mixed in with the oil. The water was in the pan, the back two cylinders and a light milky mixture on the rocking arms (valves). I drained it, removed the oil filture, removed the plugs, turned it over to remove the water, and then sprayed the pistons down with wd40 followed by a little bit of oil. From what I can see from other posts it could be a variety of items that is causing this. Should I start with checking compression? If those two cylinders that were flooded are low in compression then does that mean I have a possible blown head gasket? Thank you for any advice that you all can give.
Jamesd

 

[Haut Medoc]

Re: mercruiser with water in oil

I don't think a bad head gasket would put that much water in that quickly......
You either have a cracked block or a cracked maniold/riser & poor compression from worn rings that is allowing water to seep past rather quickly.....
Pull the manifold/riser & pressure test.....
Do the compression test & post back......JK

 

[ziggy]

Re: mercruiser with water in oil

i had me some chocolate milk too recently. mine was from a spent manifold. if it's spent and leakin, it will fill the runners with water, first start yer hosed. heres' s a pick of mine.

.

by the next morning the exhust runner was full of water. bummer. had me a cracked head bolt hole too on my last il6. it didn't leak water into the pan. did have me a blowed head gastket between 1 and 2 though.....seemed impossible to find short of inspection.
check out the second part of this bullitin. the air test. it may help ya out..

http://www.boatfix.com/merc/Bullet/97/97_25.pdf

 

[vogelsnest]

Re: mercruiser with water in oil

Thanks for your suggestions. I will pick up a compression gauge tonight on the way home and will let you know the results. Jamesd