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Old 12-14-2016, 11:56 AM   #4
Ski in NC
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City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 5,402
I think that engine came from the factory with direct sea water cooling, no antifreeze. So if you have keel cooling someone adapted it. If so, it will have only one water pump, probably the original rubber impeller type. This changes things as there is probably only one flow loop. Then just put the heater in the flow path from engine to keel cooler.

Post some pics of the engine showing pumps and hose routing.
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