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post #3 of Old 05-11-2003
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MD3B Volvo-Penta sea water to fresh water conversion

We converted our Universal Yacht Twin, (the 2 cylinder, 12 HP little brother of the Atomic Four) to freshwater cooling with great success, after 12 years of saltwater cooling. Our heat exchanger was home built out of 2 sixteen foot lengths of 3/8 inch copper tubing which were soldered together along their lengths. This was easy to do as the two coils of bright copper tubing were placed side by side as they came out of their boxes. The soldered coils, one on top of the other were then formed into a flat spiral and attached to the underside of the cockpit sole. (Foot warmer for cold Puget Sound winter sailing) The last foot on each end wasn''t soldered so as to allow for the necessary divergence for the hose connections. The necessary expansion/fill tank was fashioned from 12 inches of 3 inch copper drain pipe although it could have been made from heat tolerant PVC pipe. The hoses were hooked up so that the saltwater and the freshwater flowed through the heat exchanger in opposite diredtions. Lastly, a thermostat was added to allow the engine to get up to a desired 180 degees fahrenheit. This system proved quite satisfactory and maintenance free. Good Luck, George
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