Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 477Get this manual

Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 477

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Gear Housing Pressure Test 1 Remove vent plug and install pressure test gauge
Do not use automotive grease in the gear housingUse only Quicksilver Gear Lube or Quicksilver Super-Duty Lower Unit