1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 227Get this manual
3 If bearing must be replaced, position drive shaft assembly in vise Oaws of vise supporting only bearing) and while holding drive shaft, strike top of drive shaft with lead hammer and drive bearing off
Pinion Gear Bearing
123Inspect bearing for rust, roughness or discoloration from lack of lubricantIf bearing is damagedbearing and race must be replaced as an assemblyIf race appears to have spun in drive shaft bore, gear case housing must be replaced
52823BearingRace
Pinion Gear
aBearing
123To install new bearing, thread old pinion nut 34 way onto drive shaftPosition Universal Puller Plate (91-37241) under bearing and press on pinion nut while holding drive shaft until bearing seats against shoulder