Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 360Get this manual
Drive Shaft Assembly REMOVAL 1Remove the drive shaft pinion nut as follows: aPlace the drive shaft nut wrench onto the drive shaftDo not loosen the retainer at this timebInsert the pinion nut 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 nut into the pinion nut adapter slotcInstall the bearing carrier into the gear housing backwards to support the prop shaft and to keep the pinion nut adapter aligned
eIf the drive shaft is broken, place propeller shaft nut wrench onto the propeller 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