Water in crankcase oil

[Opa]

Hey guys, here's one for you:<br /><br />I've been working on my older (1984) 7.5 hp four cycle honda since I burned out the impeller and got the engine a bit warm (or hot...)<br /><br />The engine started after my heating event, and I gambled to replace the impeller and shaft seal into the lower unit. Now when I run the engine, and it seems to run just fine, I quickly get water in the engine oil. The compression seems OK, but clear water is leaking out of the oil filler plastic fitting. I tried to tighten up the mounting bolts, but I still get water in the oil. Any good ideas? Thanks from Opa.

 

[Silvertip]

Re: Water in crankcase oil

1) Blown head gasket, 2) cracked block, 3) cracked head are all possibilities. Overheat generally pops the gasket.

 

[Opa]

Re: Water in crankcase oil

Originally posted by Upinsmoke:<br /> 1) Blown head gasket, 2) cracked block, 3) cracked head are all possibilities. Overheat generally pops the gasket.

 

[Opa]

Re: Water in crankcase oil

Thanks for your ideas. I finally got serious and pulled the power head out of the case. It seems the seal between the oil filler neck and engine was leaking water, as a previous post suggested. I was on a fast track and used atv with a new o-ring on the water seat and so far it works. Why the engineers brought the cooling water through a plastic piece in contact with engine oil is beyond me, or why you need to pull the whole head to fix it....oh well, thanks!

 

[DJ]

Re: Water in crankcase oil

Opa,<br /><br />Don't be too jubilant. Four strokes making oil/water in oil is NOTHING new.<br /><br />It's a known and a grwoing concrn with modern four strokes.<br /><br />I'm not saying it is a problem, just an issue.<br /><br />Four srokes make plenty of water in the combustion process. How they get rid of it is another story.<br /><br />Most marine four strokes never run over 160 degrees F. That's well below the point where the engine can dispose of water vapor.<br /><br />More than likely, your four stroke has never been run hard enough to, REALLY, break it in.<br /><br />Not to depair, just change the oil more often. It will run like that for years. Just maintain it.