Join Date: Feb 2010
Location: Narragansett Bay
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Re: Diesel winterizing
It shouldn't be freshwater, but rather coolant, which is a form of anti-freeze. Therefore, if it's in good condition, it doesnt need to be drained.
I agree with Chef, that I would flush it several times. Be careful with flushing chemicals, as you could knock calcification free, which could plug passageways. If empty, I would highly consider pulling the exhaust elbow and heat exchanger to have a look and clean them up separately. Maybe replace the thermostat too.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.