2005 Mercruiser 5.0 MPI overheating at idle only

alldodge

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There is no issue on a boat open cooling system like yours, if it was closed cooling there might be an issue, but not on the raw water side.
 

Ming15237

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Feb 25, 2013
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Well she ran all day at 160 degrees! SHE IS FIXED!!! If i had to point my finger at one thing that caused this issue I couldn't. I guess it is possible that there was debris inside the engine that a flushed out and didn't see, but their was not that was obvious. There was a small amount of rust shale that came out of the motor but that was it. I was really concerned that a cylinder head had cracked or a head gasket had failed. Thanks again for everyone's input on this.
 

alldodge

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Glad your up and running and also for providing the follow up answer
Happy boating
 
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