water in Bottom Cylinder 90hp

[shasson]

I have a 1989 90 hp. After coming in on the last trip the engine started running rough through the no wake zone. When I got home I checked the plugs and the bottom cylinder had white oil in it. I thought it might be the head gasket so i changed it. Same problem even when it was started cold. Any ideas? Some one thought it might be the exhaust manifold gasket. Any help would be great.

[james12]

I think you have to go for clean uo.Make it clean and dry.Then check whether it is working or not.

[shasson]

UO

What is the UO?

[boats.net]

May have hole corroded through cylinder head or exhaust plate from water passage side, check them for holes.

[bashepard@gmail.com]

how do i do that?

How do i do this?

May have hole corroded through cylinder head or exhaust plate from water passage side, check them for holes.

[ejaybird3`]

common problem?

i have this same issue, water in the oil of lower cylinder of my 1989 90 hp, is this a common problem, most likely head gasket or in the water jacket?

[Milezero]

I know this is an old post but I've got the same problem. Replaced the head and head gasket. Piston and cylinder look fine & I have 100 psi in the 3rd cylinder (98 in #1 & 95 in #2).

Boats.net, when you say "Exhaust Plate From Water Passage side" are you talking about the part number 688-41111-00-9M, INNER COVER, EXHAUST?

[boats.net]

Yes, look for a hole in it.

[Jakefromfl]

Did you ever get it fixed Im have the same thing head and gasket looks fine exhaust plate look fine. Stumped any help?