Mercury Mariner 4, 5 102CC Sail 1990 Outboard Service Shop Manual, Page 139Get this manual
ReassemblyInstallation 1Lubricate detent spring (a) and ball (b) it 2-4-C Marine Lubricant and install ball and spring in cavity (el as shown
3Install upper shift shaft assembly (a) into drive shaft housinglever (al on.shaft (b) of sh ift lever with screw (el as shown Tighten screw securely