Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 234Get this manual
Drive Shaft Assembly REMOVAL
1Remove the drive shaft pinion nut as follows:
Place the drive shaft nut wrench onto the drive
shaftDo not loosen the retainer at this time
If th drive haft is broken, place propeller shaft nul wrench onto the propener shaft splines, hold shift shaft in forward gear and loosen(but do not fully unscrew), the pinion nut by rotating prop shaft counterclockwise to turn gears, thus loosening the pinion nut
Insert the pinion nul adapter with the MR slot facing the pinion gear into the gear housingIt may be necessary to slightly lift and rotate the drive shaft to align the pinion gear nul into the pinion nul adapter slot
Note: The propeller shaft nut wrench is included with the pinion nut adapter kitInstall the bearing carrier into the gear housing