1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 440Get this manual
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OIL PAN REMOVA L
1 In 'pec pump body for crack or wear2 In pec oil pump gear for excessive wear or da mage (v'OTE: If cle arance be tween th pinion and pump body is ov er .008" (0.2mm ),