OneIsuzu(NKR) vehicle,engineIt is a 4JB1 type with a driving distance of 120000 km.It is difficult to start a cold car in early winterexhaustThe pipe emits thick white smoke;The smoke phenomenon has been alleviated after the hot car, but the fault still exists. Through visual inspection, it is found that: low speedengineThe shaking is serious. It is preliminarily judged that one cylinder of the engine is not working well.Through the single cylinder fuel cut-off test, it was found that the second and fourth cylinders were not working well. Since no abnormal sound was heard, the simplest way to proceed was to remove the valve cover, check the valve clearance, rotate the engine to check the operation of the valve timing and rocker arm mechanism, and no abnormality was found. Due to the high pressure oil of the 4JB1 enginepumpThere is only one plunger, so it is unnecessary to check the high-pressure oil as long as there is a working cylinderpumpCheck the injection oil pressure and atomization of the cylinder nozzle and find that the oil pressure is between 180kPa and 190kPa, which proves that the oil supply of the oil circuit is normal. CheckCylinderPressure, found the 2nd and 4th cylindersCylinderThe pressure is low, about 140kPa. It is preliminarily determined that the valve seals of the second and fourth cylinders are not tight. Disassemble the cylinder head and check the valves. It is found that there is carbon deposition and ablation on the working surface of the valves. Then, hinge the valve seat and the valve, grind the working surface of the valves, replace the valve oil seals and check the valve tightness.After the loading test, the fault still exists, so it is decided to disassemble the engine for inspection. Install the engine on the test bench, and the second and fourth cylinders still work poorly;DismantleexhaustAfter the manifold, it is found that the spray is all whitediesel oilGas.At this time, it is judged that the white smoke emitted from the exhaust pipe may be the unburned exhaust from the poor operation of the second and fourth cylindersdiesel oilWhite smoke formed by gas and high-temperature exhaust gas of the first and third cylinders.Then the engine was disassembled and a comprehensive inspection was carried out. It was found that the second and fourth cylindersconnecting rodBend and other accessories are in good condition.After correction, the fault is eliminated.
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