1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 229Get this manual
Shift Shaft 12Inspect shift cam for wear or gallingReplace cam if necessaryIf cam is worn, inspect cam follower in end of propeller shaft for wear
REMOVAL
aMandrel (15 16 in socket)Universal Puller Plate (91-37241) 52845Cam FollowerShift Cam
Inspect shift shaft boot for deteriorationInspect shift shaft carrier a-ring for cuts or abrasionsIt is good service procedure to replace all a-rings, seals and gaskets regardless of appearance