Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 311Get this manual
6Operate the shift shaft to ensure that it has been prop erty installedThe sliding clutch should move forward when the shift shaft is turned clockwise, and should move aft when the shift shaft is turned counterclock wise7Make sure that the O-rings are present and positioned correctlyInstall the screws that secure the shift shaft bushing and torque them to 60 lbin (6.B Nm)
Drive Shaft and Pinion Gear