Mercury Mariner Outboards 45 Jet 50 55 60 HP Models Service Manual, Page 447Get this manual
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3 Insert lubricant tube in "Fill" hole, then remove "Vent" plugs and gaskets (b and c)4 Fill until excess lubricant flows out of "Vent" hole (b)5 Replace this "Vent" plug and gasket and continue to fi