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Water in ny oil

J

Jpat

New member
I just bought a 1999 bayliner with a 4.3 mercruiser. Engine serial number is 0L092307. The previous owner said that it had water in the motor. I drained all the oil out of it and it was all milky. I put used car oil in there. Ran it for about 5 mins. Drained all that oil out and this oil came out the same color as I put in (NOT MILKY). I then put another 4 quarts of oil in it and ran it for about 15 mins. I noticed that one exhaust port was not pushing water out like the other one. What all would you recommend replacing when I pull the exhaust manifold off. I have the one piece manifold. It does not fear that it is over heating in that 15 min time period. But the water coming out of that one exhaust is twice as hot as the other side. Any kind of information or tips y'all can help me with will definitely help thank you
 
I assume that you bought this fully expecting that you will have to replace the engine. I would just go ahead and do that and eliminate the question mark that will be hanging over you.
 
Ok well I found out that my water pump is leaking water from the bottom of it and that is the only rusty spot on the motor. Could that be the reason I'm getting water in my engine. Also the one side of the motor the exhaust manifold is always reading about 20 degrees hotter than the other side but neither one of them are going over 150 to 170 and I've let the motor idle for at least 30 minutes. My temperature gauge is not going above 175. The water coming out of the one exhaust ports is really hot about the 20 degrees difference then I'm reading from my temperature gun. I'm thinking exhaust manifold gasket or do you think the water pump will fix it
 
you cannot get water in the oil from a leaking circulation pump
1 always start with a new wp kit in the lower unit if you have no history about the boat.
I'm thinking exhaust manifold gasket or do you think the water pump will fix it
I`m thinking clogged manifolds
 
Yea I was thinking something was clogged also. Is there anyway to flush the exhaust ports without going into the motor
 
Nope, corrosion and clogging occur at the outlet portion of those manifolds, no real way to clean them
Mercruiser-43LX-V6-Vortec-One-Piece-Exaust-Manifold.jpg
 
Bt Doctur said:
you cannot get water in the oil from a leaking circulation pump
1 always start with a new wp kit in the lower unit if you have no history about the boat.
I'm thinking exhaust manifold gasket or do you think the water pump will fix it
I`m thinking clogged manifolds
Click to expand...
Or from leaking exhaust manifolds.
 
if it leaks directly into an exaust port and into the cylinder with the open exaust valve and past the rings
To take that long you would also have had some stuck valves too
 
Let's also understand that if the oil was milky from water, then the chance of the engine being any good is very small. As mentioned in a similar post not long ago, what occurs in this type of situation is that the babbit material on the bearing shells is eaten away in a matter of minutes as the guts of the engine get steam cleaned by the water. Since our current owner has no idea how long the PO ran the engine like this, he would have to assume it's got to be pretty much toast at this point.
Repair is possible, but only if the current owner is willing to do most if not all the work themself, save for any machine shop work. He will want at minimum to have everything magnafluxed for cracks, and the cam bearings installed and line honed.
Only a complete teardown and inspection will show one way or the other what kind of damage is inside, but since it was sucking water the safe choice is a new or remanufactured long block. Second option is a known-good running take out to replace this questionable lump.
It would be a shame to go through all this with the current engine only to have it sieze up away from shore. Definitely kills the mood.
 
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