1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 383Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 383

12Drive out drift pin and remove throttle gear from throttle arm 3Slide cover and friction device onto throttle arm51604 Throttle Arm Gear Throttle Friction Device Cover
51602GearDrift Pin

4Install throttle arm assembly into tiller arm5Torque friction device attaching bolt to 40 lbin(4.5 Nm)
Tiller Arm Reassembly