generally, closed, or more accurately semi-closed, the engine itself is filled and cooled by automotive antifreeze just like a car. To cool the hot antifreeze that has circulated through the engine, it passed through a heat exchanger. The heat exchanger is the radiator of the boat engine. The exchanger is then cooled by raw water from the lake circulating through it. The exhaust manifolds are then cooled by the raw water system and water returns to the lake as it does on an open cooling engine.
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