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Hi speed overheat on left side of engine 2003 5.0 L

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unix1111

New member
Hello,

2003 5.0L Mercruiser (carb) raw water cooled, alpha 1 gen2 drive.

Changed the thermostat, checked the risers and gasket (replaced), replaced manifolds/risers 2 years ago. Impeller changed 1 yr ago.

When I'm running on plane 3700-3800rpm, the port side of the engine runs hot (confirmed with ir heat gun) it is running @ 200*, starboard side is cool @ 170*, and thermostat housing is @ 180*. Any ideas why one side is running so hot? Boat was running @ 175* in May and June, this just started last week, though port side has always run hotter than starboard, but now engine is running a little warm.

Thank you,

David
 
Re: Hi speed overheat on left side of engine

Heat exchanger clogged maybe.

You have check balls on that t-stat housing ? Could be be sticking.

Finally maybe a flapper / shutter fell down, partially blocking that side.
 
Re: Hi speed overheat on left side of engine

Hello,

1) Raw water cool, no exchanger

2)check and found working flapper/shutter on hot side

3) no check balls on t-stat housing


David
 
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