2001 Mercury Mariner 50-60HP Factory Service Manual, Page 425Get this manual
NON-BIGFOOT GEAR HOUSING
Pinion Gear, Driveshaft and Forward Gear
1Hold driveshaft using Driveshaft Holding ToolRemove (and discard) pinion nutModel 5060 (4-Stroke) 5560 Bigfoot (2Stroke) 2Remove driveshaft, pinion gear, and forward gear3Replace pinion gear if chipped or worn4Replace lower driveshaft bearing if rusted or damaged; or does not roll freelyTo remove, refer to "Lower Driveshaft Bearing", following5Replace forward gear if gear teeth are chipped or wornDrive Shaft Holding Tool 91-877840A1 91-817070