1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 442Get this manual

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2 Insta ll regu lator pring, valve etcin pump cover NOTE There ha ve bee nstan ces where oil pump in engi ne has becom loos e, thus causing loss in oil ressu re on MerCruiser "80" Engines betueen ngin

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