Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 411Get this manual
NON-BIGFOOT GEAR HOUSING
Propeller Shaft
1Slide clutch (short shoulder faces forward gear) over propeller shaft aligning cross pin hole with slot in propeller shaft
2Insert cam follower spring into propeller shaft
aProp Shaft
bRetaini ng Spring
cClutch Dog
dCross Pin
eCam Follower Spring
fCam Follower