1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 317Get this manual
BIG FOOT
Forward Gear Installation
1Install forward gear bearing race into gear housing2Apply light coat of Super Duty Gear Lubricant to forward gear bearing race bore in propeller shaft cavity3Position tapered bearing race squarely over bearing bore in front portion of propeller shaft cavity4Place mandrel (91-36571) from Bearing Installation Kit (91-31229A7) over tapered bearing race5Place propeller shaft into hole in center of mandrel6Install bearing carrier assembly over propeller shaft and thread it in or turns7Thread suitable nut onto propeller shaft to protect propeller shaft threads(DO NOT use propeller nut 8Use mallet to drive propeller shaft against mandrel until tapered bearing race is firmly seated in bearing race bore