1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 351Get this manual
Steering Eyes and Coupler Installation
1Position engines so that they are facing straight forward(Distance between centers of threaded pivot bolt holes in engine steering arms must be equal to distance between propeller shaft centers
2Lubricate inside of rubber sleeves (Figure 8) and slide onto coupler3Slide rubber bushings (Figure 8) onto steering eyes
a Steering Link Rod Flat Washer (58 O.D Steering Cable End Locknut; Tighten Until it Seats [DO NOT Exceed 120 lbsin(13.5 Nm)], then Back Nut Off 14-Turn