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The water flow into the exhaust of a raw-water cooled engine is much less than that for a fresh-water cooled engine. The reason is the entire flow from the sea water pump on a fresh-water cooled engine passes through the heat exchanger and then into the exhaust. On a raw-water cooled engine, the water is recirculated, and only enough is discharged as necessary to maintain the engine water temp (usually at about 140F). As long as the engine temp is fine, don't worry.
 
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