1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 473Get this manual
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OIL PUMP The il pum cons ists of :2 gears and press ure regul ato l' va lve endos in 2-p iete hou in Oil pump is dr iven by distributor sha fthich is dri ven by helic al gear on camshaft baffle is inc