Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 187Get this manual

Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 187

2Remove nut, thrust hubs and propeller Draining and Inspecting Gear Lubricant
1Remove both VENT and FILL screws with gaskets2Inspect gear lubricant for metal particlesPresence of small amount of fine metal particles (resembling powder) indicates normal wearPresence of large particles (chips) or large quantity of fine particles indicates need for gear housing disassembly and component inspection3Note color of gear lubricantWhite or cream color indicates presence of water in lubricant
aNutThrust Hubs 52547

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