1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 630Get this manual
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6 Pla ce gea ho us ing co ver assemb l;' into hous ing: ilS Mlide for ho ldin propell er sha ft tru ight h en pressing int posi ti Dr ive up in to gca us ing: with ma ll unt il it bo ttom {Figu re ll