Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 383Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 383

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NON-BIGFOOT GEAR HOUSING

aVent PluglWasherFillDrain PluglWasher 2 Inspect gear lubricant for metal particles (lubricant will have "metal flake" appearance)Presence of fine metal particles