Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 254Get this manual
POWERHEAD
4Thoroughly inspect center main roller bearingsReplace bearings if they are rusted, fractured, worn, galled or badly discolored
Center Main Roller Bearing 5Clean (with solvent) and dry crankshaft roller bearing that is installed in upper end capLubricate bearing with light oil6Thoroughly inspect upper end cap roller bearingIf roller bearing is rusted, fractured, worn, galled, badly discolored or loose inside of end cap replace end cap and roller bearing as an assembly
Upper Roller Bearing
Reed Block Assembly