1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 627Get this manual
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MERCRUISER II HEAVY-DUTY GEAR HOUSING REMOVAL 1 Before disassembling th unit, it is rec ommen de tha gear lubricant (a pprox7 qts.6 be dra in by removi drain plug on bottom of gear hou in and filler p