1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 352Get this manual
Jam Nut; Torque to 20 lbsft(27.1 Nm) Engine Steering Arm Coupler Steering Eye Rubber Sleeves Rubber Bushing Pivot Bolt and Locknut; Torque to 20 lbsft(27.1 Nm)
7Torque pivot bolts to 20 lbsft(27.1 Nm), then thread self-locking nut onto bolts and torque nuts to 20 lbsft(27.1 Nm)