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Boat Engine Overheating at Idle

New vs corroded marine diesel raw water pump showing severe internal damage causing overheating at idle serviced by 805 Marine Diesel Mechanic Ventura California

If your boat engine overheats at idle but cools down when RPM comes up, that usually points to a raw water flow weakness, suction-side air leak, pump efficiency loss, or cooling system restriction. This guide explains how to diagnose the real cause before idle overheating turns into full overheating, repeated impeller damage, or expensive engine […]