1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 201Get this manual

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

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