Water in oil

[cchinny]

Removed the freeze plugs last year, but didn't get a chance to run antifreeze through before it got cold and I couldn't winterize. I had a really hard time starting the boat this year and finally got it running with a hose connected to the impeller. However, I realized after trying to start it a few times and with gas in the carb I had the hose hooked up to the water pump outlet. I switched it. I finally got the boat running (needed to throttle it a little because it wouldn't run at idle and when I went to change the oil it was a milkshake. I'm hoping that it is from hooking the hose up to the wrong side of the water pump and forcing water through. Guess it could be the head gasket or a cracked block. How do I differentiate what the cause is? Should I take the impeller apart and see? Should I just refill the oil with the hose connected correctly and see if I get oil in the block again? Any help appreciated.

 

[captmello]

What model motor?

 

[cchinny]

It is a 431 (V6) with a DP 290 outdrive I believe.

 

[cchinny]

I just read it can be the exhaust manifold also. How do I differentiate between all these things and what can I do to "flush the engine" until I can fix it so that it doesn't rust and corrode?
Thanks!

 

[cchinny]

Before I ran the engine, the oil was 1/2 way up the dipstick (way above full). Does this help in the diagnosis? It did look like regular oil. After I ran the engine the oil turned to the oil/water mustard mix color. Does this make you think cracked block? Should I run the engine briefly (without water) with new oil and drain it to try and save the head

 

[Mberglo]

Drain the oil by removing 3/4 inch bolt at the bottom of the dipstick tube. Let the mess run out of the transom drain into a collection pan. Remove the oil filter. Remove all the spark plugs. Crank engine and pump any water out of the cylinders. Replace sparkplugs. Install new filter and tighten drain bolt. Add 1/2 bottle of Seafoam and 5 qts of thin oil like 5w-20. Put the water muffs on properly and run engine for 10 minutes in the driveway. Shut off. Check oil level. If it looks okay, drain oil from bottom, change filter, add 5qts of good 10w-40, and you should be good to go. If you have water in the thin oil, you have other issues. Start by removing intake and looking for a crack in either the intake or the block. Good luck.

 

[cchinny]

So, I took the plugs out and one plug on the back left side of the engine had some water in it. Maybe a tablespoon worth. I put new 5w30 oil in and ran it for 5-10 minutes with the earmuffs rather than with a hose hooked up to the impeller and the oil looks clean (through the dipstick at least). So my question is, where did the water come from? I think it was too much water (1/2 way up dipstick) to be consensation.

On a separate note I noticed that one of the risers was hot and the other cool. Both manifolds were cool when the engine was running. Does that mean the riser that was hot is bad? Thanks!

 

[Mberglo]

My engine doesn't sit level with the boat on the trailer. The dipstick is at the back of the oil pan. My oil looks high when I check it that way.