1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 387Get this manual
3Insert bushings and thrust washer into shift leverInstall shift lever onto bracket 5Install two nylon bushings into tiller handleInstall stainless bushing into bracket
Install tiller handle to bracket using bolt and two washers
51620 Bushings Thrust Washer Shift Lever Bracket Nylon Bushings Stainless Bushing Bolt Washer (Thin) Washer (Thick)