1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 489Get this manual
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CAMSHAFT MEASURING LOBE LIFT
1 Re mo va lv lifters as outlin ed2 Re move crank ase front cove as out lin ed3 Rem ov fu el pum push rod by re rn ing fuel pump Complete camshaft removal as follows