1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 844Get this manual
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DRAINING INSTRUCTIONS and CYLINDER ENGINES with FRESH WATER COOLING DRAINING FRESH WAT ER SEC TI ON of COOLING SYSTEM 1 Remo ve ca from heat xc hangerCAUTIO i: Heat exc han ge is eq ui pped with 14 po