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post #8 of Old 06-02-2003
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MD3B Volvo-Penta sea water to fresh water conversion

Peter I didn''t pressurize the freshwater cooling system as it isn''t necessary for a thermostat set at 180 degrees F. Only if you intend to operate above 212 degrees F like most new cars, do you need pressurization of the cooling water system. Install a small pipe near the top of the expansion tank as a vent to prevent pressurization. My copper tank was brazed together with a vent of 1/4 inch tubing led up to the cockpit so I could monitor it in case of over heating such as might occur if one of the neopreme vanes in the pump shears off and partially plugs the plumbing at the first bend downstream. (In an emergency the pump will function quite well enough missing one or even two vanes if the missing vanes are recovered). You are welcome to the "pickings" slim as they might be but hopefully gudenuph. George
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