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Old 17-03-2014, 10:09   #1
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Join Date: Sep 2013
Location: Newport News, VA
Boat: Hunter 30
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Redundant sea water pump.

Hello. I am hoping to accomplish two things. First I wish to replace the attached sea water cooling pump on my yanmar with something modern and easy to repair/deal with while underway. I am mechanically capable and will deal with mounting etc, I am asking about knowledge on terrific pumps.

Second: I would also like to fit an independent electric pump, as the emergency as well as additional cooling when the attached pump is at idle. Same request here, I am able to handle the plumbing, I am looking for the best pump to deal with in the long term. As a sailboat, if I am using the auxiliary it's for good reason and I wish to be able to continue using it without seawater cooling casualties to worry about.

And if there are colorful stories about seawater cooling along the way, that sounds like fun too. Thank you for reading, so does anyone have a favorite pump?
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Old 19-03-2014, 07:02   #2
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Location: Carribean
Boat: Wauquiez Centurian 42'
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Re: Redundant sea water pump.

My first question would have to be why you feel you need extra cooling on a small Yanmar in a Hunter 30? We had a Hunter 31 for a few years. I'm sure you have your reasons but may be overthinking the solution a bit. If your Hunter 30 is more than 10 years old, pull and change the mixing elbow instead. Not easy and probably near inaccessible but doable and for more bang for the buck. As for the second question, do you mean you want to go from seawater cooled to closed freshwater system?
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Old 19-03-2014, 15:45   #3
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Boat: Murray 33-Chouette & Pape Steelmaid-44-Safara-both steel cutters
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Re: Redundant sea water pump.

IIRC there was this guy who overwintered in the Arctic. On the way there he lost his engine water pump in Thule. He scavenged an electric pump from a school bus, or so the story goes.

I've wondered about this myself but never chased it far.

I like Whale diaphragm pumps, I think on of them would work. GE a Gulper and refit it with nitril diaphragm, it will pump most anything.
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