1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 857Get this manual
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DRAINING INSTRUCTIONS MERCRUISER 120-140-165 With B-61086A2 CLOSED COOLING SYSTEM DRAINING FRESH WATER SECTION of COOLING SYSTEM C equipped witll 14 lbpre ur capTo remove aptum !4-Lurn to aU preure in