Sounds like a head gasket problem. Look into the heat exchanger fill with a
flashlight. If you see bubbles in the coolant when the engine is running,
that's it. Check for water in the oil. Grey and foamy - definitely a head
gasket problem. Water is getting in to the combustion process somewhere.
Philip
At 06:11 AM 12/30/2008, you wrote:
>question: engine giving out white smoke, sounds not quite smooth, and about 10
>degrees of overheating (to 90 degrees, up from the normal 80), all at 1700
>rpm. mine is a 50 hp yanmar. could anyone suggest what i should be looking at?
"Be the change you want to see"
Philip & Marilyn Lange
AE4OV & KD4JRC,
ORYOKI
Witness 35 Catamaran
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