Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 390Get this manual
NON-BIGFOOT GEAR HOUSING
NOTE: When removing propeller shaft assembly, cam follower may dislodgeRetrieve follower from gear housing
7Remove propeller shaft assembly
aPropeller Shaft MOdels 4-Slroke MercuryMariner 253040and 4550 2-S1roke Force Drive Shall Holding Tool 91-83180M