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出油阀耦件磨损滴油会使排气管间断冒白烟 四川读者张华问:我驾驶的一辆跃进NJ1061汽车NJD433A型柴油机的排气管,有时会间断无节奏地冒白烟,同时汽车行驶无力;但是停车加大油门后,又有所好转,是怎么回事? 答:该故障多是由于供油系统窜入气体,使喷油泵供油量减少所致。当松开喷油泵上的放气螺钉时,会发现有带有气泡的柴油向外喷出。 发动机在工作中,从喷油泵泵出的高压柴油往往会夹带一些杂质进入喷油嘴,并粘附在针阀体的密封锥面上,使其密封不严。由于燃烧室内高压、高温气体的烧蚀,再加上燃油中机械杂质的频繁冲刷,针阀与针阀体的密封环面出现麻点和凹坑,致使喷油嘴针阀与针阀体之间的密封性能因磨损而恶化,于是可能会出现上述故障。
Oil valve coupling wear and tear will make the exhaust pipe off white smoke Sichuan readers Zhang Hua Q: I am driving a jumped NJ1061 NJD433A diesel engine exhaust pipe, and sometimes intermittent smoke white smoke, while the car driving Weakness; but parking increase the throttle, and some improvement, how is it? A: The fault is mostly due to the fuel system fleeing into the gas, the fuel pump to reduce fuel supply. When you loosen the bleed screw on the fuel pump, you will notice that the diesel with air bubbles is jetting outwards. Engine at work, high-pressure diesel pump from the fuel pump often entrains some impurities into the nozzle, and the needle valve body sealing cone attached to its lax. Due to the combustion chamber of high pressure, high temperature gas ablation, coupled with the frequent flushing of mechanical impurities in the fuel, needle and needle body sealing torus pitting and pitting, resulting in injector needle and needle valve body Sealing performance between the deterioration due to wear and tear, so the above-mentioned problems may occur.