1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 384Get this manual
6Install gasket and cover plate over gear assemblyDO NOT OVERTIGHTEN attaching screws 9Retract throttle cable into gear assembly until approximately 17 in(43 cm) extends from the tiller arm
aCover PlateGasket (below cover)Screws
51604 51604Cable [Extends 17 in(43 cm)]
7Rotate throttle arm so that twist grip attaching screw hole faces DOWN and gear drift pin faces UP8Insert throttle cable (CURVED END FACING UP) into tiller handle gear assembly while rotating tiller arm COUNTERCLOCKWISE