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40hp Force Mercury Water in Cylinder Problem

bobdie

New member
"I have a 1997 Force Mercury,

"I have a 1997 Force Mercury, starts easily, seems to have good top end, engine idles rough and runs rough to mid range, like a spark plug misfiring. When I remove the plugs, bottom plug is milky and has water droplets on it as if water is getting into the cylinder. Where could water be getting in from?"
 
"Your motor is very much a For

"Your motor is very much a Force and does not resemble a 40 Merc - Merc's parent company owned Force until the line was discontinued.

Water could be coming in from a bad head gasket, bad powerhead base gasket or even a bad exhaust cover gasket.

All are relatively inexpensive and can be easily changed. I would suspect the head gasket first..."
 
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