Answer
Apr 14, 2023 - 04:56 AM
To keep the engine block from getting seawater in it when a closed cooling system is used. The antifreeze will circulate using the water pump or circulating pump and go through one circuit of your heat exchanger. The only component that should see seawater in this case is the heat exchanger, which is an expensive but unfortunate sacrificial component on a marine engine so that the block (half system) or block and manifolds (full system) don’t experience corrosion from the surrounding water source.
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