97 Force 75 hp combustion problem

[Nordin]

Yes usually when water intrusion in a cylinder and the head gasket or exhaust gaskets are good, there is a crack in the water jacket.

I was restoring a 75Hp Chrysler which had #2 and 3 cylinder scored. Left the block to a machining shop and when they started to bore #3 cylinder we discovered a small small crack/hole in the wall to the water jacket.
It was small as a pinhead.

 

[jerryjerry05]

Yes a crack could be there??

Was working on a 4 cyl.80's 50hp Mercury.
The 2nd cyl. kept flooding with fuel.
At startup it ran good and then when warm it would flood and run bad.
I rebuilt the carbs 2-3X and the reeds checked OK.
Then dismantled the motor and found a hairline crack in the intake side.
No idea how it cracked unless it got too hot? maybe metal fatigue?

 

[racerone]

Bottom seal on the crankshaft can let water into an engine.

 

[jerryjerry05]

Says the waters on the top plug?
That sounds more like a gasket , maybe a cracked cyl. wall, warped head, not tuorqed correct,
The way the exhaust exits on that block: it all dumps into the exhaust chamber.
If the gasket or the baffle plate was bad it would probably get water in all the cyl. and a light brown goop would be coming from the snout on the bottom.

 

[racerone]

Is there an oil recirc system that brings stuff from bottom cylinder to the top.

 

[jerryjerry05]

.
The recirc system has all 3 cyl feeding back into the recirc and that would make all 3 get water.
No oil injection.

 

[Creed1]

I was told by a boat mechanic that the 75 hp with the single carb was bad for a reed valve problems does that sound like what could be the problem in this case?

 

[jerryjerry05]

Reeds have nothing to do with water.
They're no place near the water passages.

The problem with a lot of the 3cyl. The top cyl. doesn't feed right.
They moved the carb up but still isn't the best system.