1993 maxum 4.3 water in oil

[suburban99]

Bought a 93 maxum with a 4.3..
Engine was replaced 3 years ago. New engine got hydro locked and previous owner pulled it and removed intake. Been sitting in his shop for 2 years.
Puller off risers and exhaust manifolds, evidence of water in cylinder 5 and 6. Pulled heads and no blown gaskets..although the riser gaskets are suspect. Pressure tested risers to 50 psi and no leaks. Went to look for shutters in exhaust as I was running out of reasons for water in oil. Right side shutter is completely missing.

Boat was stored on a lift in the water with outdrive slightly above the water. It is possible that waves could splash into outdrive. I have ordered gaskets and shutters and will reassemble and test..

How many oil changes to rid the engine of excess milkshake?
Do you think the missing shutter could be the root cause?
Thanks in advance.

 

[Bondo]

How many oil changes to rid the engine of excess milkshake?
Do you think the missing shutter could be the root cause?

Ayuh,..... Welcome Aboard,.... Have you had it running,..??

If the water came in from the exhaust, I change it once, 'n Run it,.....
Any remainin' water will steam off in a few hours of runnin' at temp,....

Where has this boat been livin',..??
I'd sooner think a frozen busted block, over blamin' the missin' shutter,....
But,..... Anything is possible,.....

 

[suburban99]

Boat is freshwater cooled and antifreeze tests good. Small drain valves are installed in the exhaust manifolds to drain raw water..I am up in BC and yes it gets cold up here but this boats was stored indoors and winterized by a marina. (I know the old owner and see the boat in his shop every year) A couple years ago he pull the lanyard at WOT and then tried to switch it back on. He blew a hole in the side of the block and engine was replaced with a reman. I guess I'll install the head gaskets and change the oil and see.