1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 302Get this manual
BIG FOOT
Disassembly
IMPORTANT: It is recommended that, during complete disassembly of gear housing, all O-rings and oil seals be replaced, regardless of their appearance
Bearing Carrier
1Remove screws which secure the O-ring retainer plate and O-ring to the bearing carrierRemove the O-ring retainer plate and O-ring from gear housing2Remove bearing carrier using Special Tool 91-938431 (LEFT HAND THREAD)91-938431