1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 195Get this manual
Forward Gear, Lower Drive Shaft Bearing, Pinion Gear, and Drive Shaft Installation 1Install components in sequence shown
2With gear housing positioned up right (drive shaft vertical), install Bearing Preload Tool (91-14311A1) over drive shaft in sequence shown
19175Forward GearBearing: Work Quicksilver gear lube into bearing rollersbLower Drive Shaft Tapered Roller Bearing: Work Quicksilver gear lube into bearing rollerscPinion GearDrive ShaftDrive Shaft Holding Tool (91-56775)Pinion Nut (New): Apply Loctite 271 to threads during final assembly (after pinion gear depth and forward gear backlash have been set), torque to 70 lbft(95 Nm)
Adaptor: Bearing surfaces clean and free of nicks Thrust Bearing: Oiled and able to move freely Thrust Washer: Clean and free of nicks and bends Spring Nut: Threaded all-the-way onto bolt Bolt: Held snug against spring Sleeve: Holes in sleeve must align with set screws Set Screw (2): Tightened against drive shaft, bolt should not slide on drive shaft