Mercury Mariner 4, 5 102CC Sail 1990 Outboard Service Shop Manual, Page 121Get this manual
14Remove retainer plugs (a) 16Rotate sheave (a) in direction arrows while hold ing spri ng housing (b) statio nary
15Remove guide plate (a) 17Carefull lift spring housing (a) with coiled spring (b) from sheave (c) if necessa ry remove plate (d)