runs at 180 degrees unloaded at mooring . Underway temp rises until alarm goes off, running at 2800 rpms. Appears to be plenty of raw water discharge . Fresh water coolant topped off. Engine has 850 hours on it. Anyone else have same issue?
Easy to be fooled by raw water discharge. When was the impeller last replaced and has the heat exchanger tubes been checked? For example, if an impeller blade where to break off it will land in the heat exchanger. Finally, is the prop and bottom clean. A fouled prop will definitely cause exactly what you described, I know from experience.
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