/diy/ - Do It Yourself

>>2019274
Right now that engine is raw water cooled. It sucks in whatever you're sailing in and pumps it thought the engine. That's okay for fresh water but in salt you'd be pumping salt water though the block rusting it from the inside out. Alternatively you run a closed loop system of antifreeze thought the block and into a heat exchanger which also has raw water pumped though it absorbing the heat. Keeps salt out of the engine. An added bonus is if your water heater has the ports you can circulate the engine coolant though the water heater and get hot water on the hook.