Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 19Get this manual

Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 19

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Flushing The Cooling System Flush the internal water passages of the outboard with fresh water after each use in salt, polluted, or muddy waterThis will help prevent buildup of deposits from clogging