Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 478Get this manual

Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 478

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5 Replace this lubricant "Vent" screw and gasket only and continue filling until excess starts to flow out of second lubricant "Vent" screw hole Gearcase Installation
6 Replace second lubricant