milky oil?

[Tron13]

So I bought a 2008 merc 115 efi four stroke that had been overheated. Filters/melted parts replaced, supposedly running well when I bought it. Took it for a rip, lacked balls out of the hole. Pulled it out to check the basics, and found the engine oil milky. Compression all tested good (175,176,175,176). I've heard some times seals need to set, and fuel can get in. But I don't think fuel turns oil white (correct me if I'm wrong). Looking to repair before I blow it up. Any ideas? Buddy says head gasket or more likely base gasket. But looking for some seasoned advice.

 

[Texasmark]

Did you change the oil upon purchasing and oil turned milky while you were doing your shakedown cruise? If not, could be that PO lived up North and or did a lot of trolling. Problems with too much oil and milk show up here all the time for the reasons specified. Change the oil and ring it out good....work it hard for a bit, check the oil, then worry about a problem. Might toss in some Sea Foam and run it a bit, drain the oil and run it again looking for clear oil second time.

Lacking balls out of the hole is a common gripe too for those used to 2 strokers. If you want more whoopie out of the hole get a ported prop, like Turning Point Hustler in premium aluminum and Laser II for a name in SS.

 

[Tron13]

Slow out of the hole was an understatement. Catwalking for 20 seconds before it planed out. Found I have 4 crank case bolts loose to the touch, but threaded tight as can be (could be fused). Milky oil leaking from one of these bolts. 2nd and 3rd from the top on both sides in a series of 5 (x2) vertical bolts.

 

[Tron13]

Further to that, oil was clear and clean after we drove it from his dock to the launch (10 mins). But only turned milky after I took it out for a 15 min ride at home.

 

[Texasmark]

Well I think your found your problem with the loose bolts.....allowed water into the crankcase. With what you said, seems like the logical answer......Question is, why were the bolts loose in the first place?