2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 579Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 579

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GEAR HOUSING
1 Tilt the outboard motor up slightly2 Place drain pan below outboard3 Remove vent plug and filldrain plug and drain lubricant

aFillDrain ScrewVent Screw 4 Inspect gear