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Old 26-01-2012, 09:03   #1
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Raw Water Cooled Conversion Prep

Now that my boat is at its permanent mooring, the engine won't need to be started until probably late May, giving me 3 to 4 months to do the planned conversion to a fresh water cooled system on my Volvo MD17C.
I was thinking that it would be a good idea to leave the engine sit until then with something other than sea water in the cooling system.
What would be best? Just a diesel engine antifreeze/coolant, straight vinegar or some other mild acidic solution that won't destroy my impeller or other non-metal parts?

Tks,

Ron
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Old 09-02-2012, 16:26   #2
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Re: Raw Water Cooled Conversion Prep

My md-11 has been soaking in a strong solution of the product "Salt-Away" at the machine shop and the parts look like new. How complicated is the conversion? I am reviving my badly salted up Volvo and I am adding a freshwater flusher plumbed to my domestic water system.
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Old 15-02-2012, 07:23   #3
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Re: Raw Water Cooled Conversion Prep

Hi Vortex. I'll have to look into Salt-Away. I've never heard of it before. I asked a mechanic at Pender Harbour Diesel what he thought I should use and he just recommended a diesel anti-freeze, so that's what is in there now. I think something that would actually break down and dissolve the salt deposits and corrosion would be better than just anti-freeze.
I haven't done a conversion, my self... yet but I will one day. It isn't very complicated but is expensive. Still, less expensive that replacing a plugged up block and manifold, or entire engine. Basically, you run sea water into a heat exchanger, which has hot coolant circulating through it from the engine and returns it to the engine. So you need a second pump and a heat exchanger along with various fitting, clamps, mounting brackets and hoses.
I like the idea of the fresh water flusher. Definitely easier and cheaper than a complete conversion.
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Old 15-02-2012, 12:22   #4
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Re: Raw Water Cooled Conversion Prep

I would flush out the system and soak it with Salt-Away, changing it every couple of weeks.

Here's a flush kit I've built which takes only a few minutes to set up. >>> Running an Inboard Engine While on the Hard
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Old 16-02-2012, 10:43   #5
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Re: Raw Water Cooled Conversion Prep

Thanks yet again, delmarrey. Your link connected me to the hydrolocking risk. The bucket method will suffice.
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