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White Smoke or Steam

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bob guiney

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I have a 30' sea ray seda

I have a 30' sea ray sedan....twin 260 mercs. FWC. Port engine running hotter than starboard 170 vs.145 at cruise. Also only getting to 3400 RPM at WOT. And steam/white smoke....have replaced risers and manifolds....could this be an impleller problem?
 
"Bob, does the steam from t

"Bob, does the steam from the hotter engine have a distinct smell to it? Sort of sweet or slightly oily? If it does, that and the other symptoms would point to a blown head gasket. Steam is normal in a wet exhaust system so it can be hard to tell. What does the oil look like in the hotter engine? Is it getting milky?

A worn impeller or circulating pump won't cause the 3400 at WOT. A compression check or leak-down test on that engine's cylinders may be helpful here. This assumes the engine was running normally before you noticed the higher temp and excessive steam.

"
 
I've got a 1979 slickcrat

I've got a 1979 slickcrat 26 foot 454 crusader. I'm starting to see a lot of steam coming out of the exhaust. what could it be? The temp guage is new and it's not overheating.
 
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