Hi everyone. I'm a complete newbie when it comes to outboards so please excuse me if I say ask or say something silly. My fishing buddy has a 1995 30hp Johnson outboard model# J30ELEOB serial# G03863095 that has water in the lower cylinder. He made the big mistake of forgetting to add oil to 1/3 tank of fuel. What I mean is that he had a 1/3 of a tank of good fuel/oil mix left after a day on the lake then filled the tank with straight fuel. He had ran out of oil to mix so he thought, no biggie, I'll just add the correct amount of oil the next trip up to the lake. Well you guessed it, he forgot to add the oil on the next trip to the lake. He told me that it ran normal for about 20 minutes then died and never started again.
Thinking that cylinder must be scored I took the cylinder head off to see how much damage was done to the cylinders and pistons and to my surprise there is zero damage! I never carried out a compression test at first because I thought for sure the cylinder and at least the piston rings would be damaged.
Can anyone tell me if the head gasket is the culprit or the saviour depending on how you look at it? I figure the the motor overheated allowing water to flow past the head gasket and into the cylinder. Would this be a correct diagnosis?
Also is there a way to drain the crankcase? I'm afraid (not sure) that water has made its way into the crankcase as well.
Any help would be appreciated.
Thinking that cylinder must be scored I took the cylinder head off to see how much damage was done to the cylinders and pistons and to my surprise there is zero damage! I never carried out a compression test at first because I thought for sure the cylinder and at least the piston rings would be damaged.
Can anyone tell me if the head gasket is the culprit or the saviour depending on how you look at it? I figure the the motor overheated allowing water to flow past the head gasket and into the cylinder. Would this be a correct diagnosis?
Also is there a way to drain the crankcase? I'm afraid (not sure) that water has made its way into the crankcase as well.
Any help would be appreciated.