Bearing inspection and repair
1) The damage of the inspection and correction of the bearing of the bearing seat is mainly worn, fatigue peeling and melting. When the engine is repaired, new bearing must be replaced. Before repairing the bearing, you should first check whether the bearing seat hole meets the requirements. The roundness and cylindrical error of the bearing seat holes should not be more than 0.015mm. The method of inspection and correction is: clean the bearing seat, install the bearing cover, tighten the fixed bolt or nut in accordance with the specified torque, and check the roundness and cylindricality of the seat hole in the cylinder meter. Machining or pad adjustment is not allowed to repair the bearing cover.
Check the wear method of the bearing as shown in Figure 2-16. Wash the oil of the nephew and the bearing of the bearing, cut the gap between the plastic line into the same length as the bearing width, and then place it on the crank to make it as the central line of the shaft. Parallel, carefully install the bearing cover, tighten the nut in accordance with the prescribed torque, then carefully remove the bearing cover, use the gap in the gap in the plastic line to pack the ulnar. Width, get the gap value. New bearings should be replaced when the limit is exceeded.
2) The selection of bearing is currently available. The bearing alloys often used in gasoline engine cranks bearing include Pakistan alloy and high tin aluminum alloy. The thickness of the alloy layer is 0.30 to 0.35mm. The first -level repair size corresponds to the crankshaft axis, so that it can be selected during repair.