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Old 04-11-2013
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Re: Yanmar cooling confusion

With a "fresh water" cooled engine you will have two (2) water pumps. One pump forces raw water through the heat exchanger (HX), the other forces anti-freeze through the HX. So, if you sail on salt water there really isn't any fresh water involved in the cooling system unless you put fresh water in to dilute the anti-freeze.
The term "fresh water" cooled is misleading. Closed circuit cooling makes more sense to me.
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