milky spark plugs?

[Dawgs]

1986 johnson 150

boat idled rough and then stalls. i pulled the plugs and the bottom 2 plugs starboard side had a milky coating on them. water in the cylinder? i did a compression test and got 73 on all cylinders. does that rule out head gasket? how is the water in the cylinders?

 

[ezeke]

Re: milky spark plugs?

The compression test does not completely rule out the cylinder head gasket, but water could come from the exhaust gaskets, from water in the fuel or from a cracked block. It could also come from too much pressure on the water supply when using muffs.

 

[Dawgs]

Re: milky spark plugs?

when you say exhaust gasket....you mean the flat cover located in the middle on the back of the motor? from what i have been reading there are actually 2 gaskets in there. whats the likelyhood of that being the problem.

the boat had this problem while in the water not on ears

 

[ezeke]

Re: milky spark plugs?

when you say exhaust gasket....you mean the flat cover located in the middle on the back of the motor? from what i have been reading there are actually 2 gaskets in there. whats the likelyhood of that being the problem....

Yes, and very likely if it is not the head gaskets that are leaking.

Edit: I think that your model uses two 0321182 exhaust gaskets.