2001 Mercury Mariner 50-60HP Factory Service Manual, Page 478Get this manual
BIGFOOT GEAR HOUSING
6Replace forward gear needle bearing if it is rusted or does not roll freely7Use suitable tools (screwdriver and awl) to remove retaining ringUse punch and hammer to remove bearing
a -Retaining RIng -Forward Gear Needle Bearing 8Replace forward gear bearing and race if either are rusted, pitted or damaged; or if bearing does not roll freelyRemove bearing from gear using Universal Puller Plate (91-37241) and mandrelTo remove race, refer to "Forward Gear Bearing Race," following