Water in Cynlinders

[Bobbuff]

Took off part of my top end yesterday and found it have quite a bit of water inside. How much water is normal inside of there and is this a sign that I might have to replace the lower half as well. Also how do I diagnose what made the piston go bad to begin with?

 

[FinnExplorer]

There should be no water at all in cylinders . Water in jackets is normal after use. If you see water in top end it most likely is also to be found in the bottom. If it has been sitting there for too long, it's bye bye crankshaft bearings. If it's trashed you have few ways to go on. Replace the engine with a rebuilt engine or overbore the cylinders and put in new crank(especially if there was water in the bottom end) and oversize pistons. Or if you're afraid of bored engine the cylinder sleeve can be replaced also... the case halves should be kept together since they are a pair. What I mean is the lower part is made of two pieces that are a pair and cylinders can be mixed from other engines.

What does the bad piston look like? Is it melted someway or are the cylinder walls scarred badly?

 

[Coastiejoe]

Agree. Not a place for water. Need to determine WHY or HOW it got there. Was the ski towed by chance?


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[Bobbuff]

There wasn't water down in the cylinder by the piston just around the edges where the bolts are....the top of the piston was fried though and looked awful....I have no idea if it was ever towed nor do in know the cause of the low compression

 

[Coastiejoe]

There wasn't water down in the cylinder by the piston just around the edges where the bolts are....the top of the piston was fried though and looked awful....I have no idea if it was ever towed nor do in know the cause of the low compression

Are you saying that water was laying on the outside of the eninge. Like if it was splashed or sprayed with a hose?
If so, that could be anything. A hose breaking, leak in the head or cooling system, ect ect..

The boats never used the Grey Tempo lines, so that is not the cause of the failure. But it could have easily been a lean condition as that will destroy the pistion..

 

[kicker]

The water flows around the cylinders shown by the green arrow in picture. If that is where the said water was, how much water was in there, was it full or just a few drops? My thinking is that if it was full, that would mean the water is not flowing through that cylinder jacket properly and the outlet drain is plugged. Which would overheat that piston.

 

[Bobbuff]

Kicker that is the perfect example. Thank you. There was more that a few drops. Probably around a half of an inch. I wonder if this is why that piston is fried

 

[Bobbuff]

CoastieJoe if you look at the picture he posted where the green circles are is where I found the water. I was in excess of what it should be I do believe. I am sorry it took so long to respond. I have examined the crankshaft from what I can see I do not believe there are any issues. Is there an easy way to remove the piston???

 

[dbracela]

Water in the water jacket is a good thing. Can you post a pic of the piston? What makes you say it's trashed?

Edit: re-read the thread. You're saying the water isn't flowing out?

 

[Bobbuff]

Hey sorry it took so long to reply. My original concern was water being in the water jacket. There was no water in the actual cylinder itself. I know it is trashed because the top of the piston is tore to hell as well as the cylinder walls. I am just hoping I can get away with just replacing the top end and not the whole motor.