200HP TXEO seized up- Options ?

[Jimdsi]

About a month ago, my boat took on lots of water. Didn't know it right away, but some saltwater got into the oil tank and obviously got drawn into the engine. After I realized what happened, I drained the oil tank dry and refilled with clean, fresh oil. Purged the oil line and ran the engine to distribute the oil. The engine has been started and ran fine a few times since then. Yesterday, I went to winterize the engine and found it seized up. Pulled the plugs and found very light rust and small, green corrosion or mold. I sprayed CRC into all the cylinders and will wait a day or two to let it soak in. Can a recently seized engine be recovered without a major tear down ? What's the best and worst scenario here ? Thanks in advance.

 

[daselbee]

Newly sunk engines must be started immediately after getting all water out. They can live thru a sinking but must be run hot til dried out.
This did not happen with you, and I do realize you didn't sink...but ingested water thru the oil system.

Best scenario is you get it loose with oils and sprays, it starts and you go on with no problems.

Worst scenario....and I suspect this is what you might find....is that the crank bearings (rod and mains) have rusted. The rust permanently marks the crank journal, and is unlikely to be polished out. The cranks cannot be ground undersize, and no oversize bearings are made.

The seize up is probably limited to the piston rings sticking to the cylinder walls, i.e. the bearings are not causing the seizing.
There may be heavy cylinder bore/sleeve rusting.
You will end up with low compression.

I am afraid you are looking at re-powering. That engine would not be cost effective to rebuild.
I have an 87 150 on a stand in my shop right now gathering dust.

Possible powerhead donor. PM me if interested.

 

[daselbee]

"EO" ????? Crap....that's a 96, I was thinking 86....my bad. The powerhead I have will not work.

 

[Silvertip]

Since the engine may fail due to the sinking and water, what have you got to lose by attempting to run it. Why not try this! If you are certain the oil injection is still functioning, add oil to the main fuel tank so that fuel has a 40:1 mix in addition to what the oil injection delivers. Run the boat (certainly not far from the landing/slip) at moderate throttle settings. If anything serious is going to happen it will happen relatively quickly. If the engine seems to be running ok, periodically check the plugs for evidence of metal particle transfer. If metal particles are found, the engine is coming apart. THEN it is time for rebuild or repower. I certainly would not rush into rebuilding what may be an abused, but perfectly serviceable engine. The engine will certainly smoke during this "trial" period but what the heck. It's not like you will permanently run it that way.

 

[boobie]

Did the power head go under water or was it just the oil tank ??

 

[Jimdsi]

Just the oil tank went under. I had to run the engine in the slip in order to power the bilge pumps to re float the boat. When I got the boat home, I found about 6 inches of water at the bottom of the oil tank. Cleaned it out and refilled with fresh oil, ran the engine to push clean oil in. Too late, I guess. I can get a rebuilt long block for about 2K. looks like I'm headed in that direction. I take the boat offshore, gotta have confidence in the engine.

 

[boobie]

You could try mixing up some Acetone and ATF 50:50 and squirting that in the cylinders in a tilted position and let it sit. If you get it broke loose it may be worth trying to start it.