water on my spark plugs

[zabortnick]

Hello, I have a 15 hp mariner that will idle and run at low rpm in gear but dies when you give it some gas. rebuilt the carb but when I took out the plugs there was a lot of water on and in my plugs, way too much to be from fuel and gas and can are clean so I know there is no water in my fuel. I would think head gasket but it doesnt have much of a head, more like a cover plate and thermostate. what do ya think?? could it be a bad crankcase seal suckin water, or a head and waterjacket issue. I would very much appreciate some input on this before I start tearing the whole thing apart. Thank you very much

 

[DAN M VAGOS]

Re: water on my spark plugs

I would think head gasket. Try doing comp test or just pull the head off it cant be more then a 10 min job

 

[Faztbullet]

Re: water on my spark plugs

Sound like you have the Merc/Mariner as it has no cylinder head or gasket. Only way water can enter is thru lower seals or exhaust divider plate.Divider plate is easiest to pull and inspect.

 

[zabortnick]

Re: water on my spark plugs

ok, thank you very much, I will check the divider and prob put the compression tester on it just to see. can I replace the divider or lower seals without breaking down the crankcase? Thanks again for your input it is much appreciated. I wrench at a small shop in upper mich. alot of carbs and water impellers, gaskets and such I even rebuild lowers, but havent done a total seal job on a power head yet. can you tell me about how many manhours it should take?