1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 361Get this manual
Coupler Installation WARNING Locknuts must be used with bolts to secure steering cables to couplerFailure to adhere to this requirement could result in steering system failureSlide coupler onto steering cable ends and secure each steering cable to coupler with bolt and locknut as shownTighten to torque of 20 Ibft(27.1 Nm)
Lubricate ball joint in steering link rod with SAE 30W Motor OilSecure link rod to outboard steering arm, using special washer head bolt (10-14000) provided and nylon insert locknut as shownTorque special bolt to 20 Ibft(27.1 Nm), then torque locknut to 20 Ibft(27.1 Nm)
51790 Steering Coupler Steering Link Rod Flat Washer (2) Nylon Insert LocknutTorque until it seats [DO NOT exceed 120 lbin(13.5 Nm) of torque], then back nut off 14 turneSpecial Washer Head Bolt (10-14000)Torque to 20 lbft(27.1 Nm) -
aCouplerBoltLocknut