Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 181Get this manual
General Service Recommendations There may be more than one way to "disassem ble" or "reasse mble" particu lar partes), therefore, it is recommended that the entire procedu re be read prior to repair
inglubricate bearings with Formula 50-0 OilDO NOT lubricate tapered bearing cups until after inspect ion Inspect all bearings for roughness, catches and bearing race side wearWork inner bearing race in-and- out, wh ile holding outer race, to check for side wearWhen inspecting tapered bearingsdetermine condition of rollers and inner bearing race by inspecting bearing cup for pittingscoringgrooves, uneven wearimbedded particles and or discoloration from overheating Always replace tapered bearing and race as setRoller bearing condit ion is determined by inspecting the bearing surface of the shaft that the roller bearing supportsCheck shaft surface for pillingsco ringgroovingimbedded particlesuneven wear andl or discoloration from overheating The shaft and bearing must be replaced, if the conditions described are found