Join Date: Feb 2010
Location: Narragansett Bay
Thanked 385 Times in 364 Posts
Rep Power: 9
Re: Engine over temp at idle
Must change impeller, whether the culprit or not. Is your seawater pump driven by a belt? Worn or loose belt will dramatically reduce flow rate. Overly tight belt will wear too quickly.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.