1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 625Get this manual
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DRIVE UNIT LUBRICATION 1 Replace drain plu loca ed on bottom o[ gear casE'2 Remove fi ll er pI ug fr om real' cover and fi 11 un it with Ki kha efer SUPER- DUT Qui ks ilver Gear Lubn ca nlthat is avai