1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 16Get this manual
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FLUSHING COOLING SYSTEM MERCRUISER 60-80-90 and and -CYLINDER ENGINES (Except 200) and 888 ,I'OTE: Wh e1l n"in is pera ted in sailor ill water, it is co mmended to flush engine with fresh wa ter perio