1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 231Get this manual
Reverse Gear 1Inspect reverse gear teeth for rust, chipping excessive wear (teeth are sharped edged) or broken teethInspect reverse gear clutch jaws for wearRounded jaws indicate the following: Improper shift cable adjustmentEngine idle speed too highShifting too slowlyInstall new bearing using suitable mandrelPRESS ONLY ON INNER RACE when installing bearing
Driver (91 -37312) Bearing Reverse Gear Universal Puller Plate (91-37241