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近年来,不少机手采取换件修理的方法,大修4125发动机。更换由于长期工作磨损了的曲轴、主轴瓦、连杆瓦、机油泵、气缸盖、缸套、活塞、活塞环等零件。机手希望通过换件修理恢复发动机的功率,消除因缸套、活塞、活塞环磨损而引起的发动机窜烧机油;消除因曲轴轴颈、主轴瓦、连杆瓦磨损而引起的发动机机油压力低的问题。但在发动机修好后试车磨合中仍然出现这两个故障。一是发动机仍然窜烧机油,排气管上下都有排出的机油痕迹。经过负荷磨合,发动机窜烧机油现象并没有得到好转。二是发动机机油压力低。随着机油温度的上升,机油压力逐渐由2～
In recent years, many of the hands to take replacement repair method, overhaul 4125 engine. Replace the crankshaft, main bearing bush, connecting rod bush, oil pump, cylinder head cover, cylinder liner, piston, piston ring and other parts worn out due to long-term work wear. Engineers hope to restore the engine power through the replacement repair, eliminating the cylinder liner, piston, piston ring wear and tear caused by the engine channeling oil; eliminate due to crankshaft journal, main bearing bush, connecting rod wear caused by low engine oil pressure The problem. However, after the engine was repaired, the two faults still occurred during the test run. First, the engine is still burning oil, exhaust pipe up and down have traces of oil. After the load run-in, the engine does not burn oil phenomenon has been improved. Second, low engine oil pressure. As the oil temperature rises, the oil pressure gradually from 2 ~