Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 460Get this manual
BIGFOOT GEAR HOUSING
6 Jaw Reverse Clutch
aStamped "6"Numbered end of Needle BearingJaw Reverse Clutch 3Apply Quicksilver gear lubricant to 1.0of forward gearPress bearing into forward gear until tool contacts gear