1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 494Get this manual
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CYLINDER BLOCK OIL FILTER BY-PASS VALVE INS PECTION end REPLAC EMENT
CL EANI NG and INSPECT ION
1 Remove all engin components as prc ' iously outlined2'a jnder bl ck thoroughly in c