一、一台上海495GA型柴油机,工作时汽缸盖处有异响,用户没有找到故障原因,送到了三包站,经我们检查,气门间隙正常,其他系统也没有异常情况,拆下排气管,发现四个缸积炭都较多,这说明柴油机工况不好,启动发动机,一缸低速不工作,其它三缸排气烟度大。拆开一缸,发现喷油器磨损严重。据用户说发动机使用的是低价柴油。正是这些劣质柴油造成喷油器磨损严重。 First, a Shanghai 495GA diesel engine, working cylinder head abnormal sound, the user did not find the cause of the malfunction, sent to the Three Guarantees station, after our inspection, the valve clearance is normal, the other system is no exception, remove the exhaust pipe , Found that four cylinder coke are more, indicating that the diesel engine is not working well, start the engine, a cylinder low speed does not work, the other three cylinder exhaust smoke. Open a cylinder, found that the injector wear serious. According to the user that the engine is using low-cost diesel. It is these poor diesel fuel injector caused serious wear.