Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 246Get this manual
NOTE: Reverse gear roller bearing and cup can be replaced individually or as an assemblyPN 813362Al 5If inspection determines that replacement of propeller shaft needle bearing in REVERSE gear is requiredplace REVERSE gear in press and use mandrel 91-36569 to press bearing out of gear 5To determine condition of reverse gear roller bearing located in bearing adaptor, inspect reverse joumal where bearing rides for pitting, grooves, scoring, uneven wear and discoloration (from overheating) Replace roller bearing andor reverse gear if any of these conditions are found
Gear Housing
CLEANING AND INSPECTION 1Clean gear housing with solvent and dry with compressed air234Check gear housing carefully for impact damageCheck for loose fitting bearing cups and needle bearingsInspect bearing carrier cover nut retainer threads in gear housing for corrosion damage andor stripped threads
Reassembly and Installation of Counter Rotation Gear Housing
aAeverse GearMandrel (91-36569)
Drive Shaft Needle Bearing
REASSEMBLvnNSTALLATION