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Old 19-06-2009, 04:54   #31
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Join Date: Mar 2009
Location: The boat: Cowes (Winter), Above 60N (Summer); me: somewhere in the air!
Boat: Cutter-Rigged Moody 54
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Great feedback. Thanks everyone.

So I guess the most likely culprits are:

1. Exhaust elbow
2. Thermostat
3. Impeller or slipping belt.

I'll work through those and see what happens.

Concerning driving the boat beyond hull speed -- maybe, at max throttle. But the engine won't develop more than its rated maximum power anyway, and the cooling system should be able to handle that. Right?

Anyway, the overheating starts far earlier than approaching hull speed.

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Old 19-06-2009, 06:36   #32
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Join Date: Oct 2006
Location: Nanaimo, BC
Boat: C&C 41
Posts: 360
Don't forget to check that intake hose. I always like to start with the simple cheap stuff and work up to the more expensive/complicated fix.

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