(1) Listening method: use stethoscope or stick, close to the body of syringe, listen to the sound of cylinder explosion. The sound of normal metal knocking is similar to "Dangdang". If there is only "good", it is not only a sound row, and then there is little or no oil tank fire time. For example, the sound of big gongs and drums indicates that the injection volume of the oil tank is too large or too early.

（2）彩色法律概念：当发动机正常工作，从浅灰色的排放量，负荷大，有点深如排黑气，表明可燃气体不完全燃烧排蓝焰的润滑油进入气缸燃烧白烟行，那么就在柴油机水，燃烧的可燃气体，也是白烟行连续排放废气排放不寻常的颜色，这表明设备工作不正常。

(2) Color legal concept: when the engine works normally, the emission from light gray is large, and the load is a little deep as black gas, indicating that the combustible gas is not completely burned, and the lubricating oil discharging blue flame enters the cylinder to burn white smoke line, then in the diesel engine water, the combustible gas is also the continuous emission of white smoke row, and the unusual color of exhaust gas emission, which indicates that the equipment is not working properly.

（3）柴油发电机组感温法：在柴油机启动后的更初阶段（工作一段时间后排气管温度很高，用手触摸会烫伤）用手摸各缸排气管的温度，可鉴别各缸工作情况如果各缸排气管的温度比其他缸高，说明该缸供油量偏高；若温度低，则该缸供油量少、或不喷油、或喷油后没完全燃烧或不燃烧。

(3) Temperature sensing method of diesel generator set: in the initial stage after starting the diesel engine (the exhaust pipe temperature is very high after working for a period of time, it will be scalded by touching by hand), and the working condition of each cylinder can be identified. If the temperature of exhaust pipe of each cylinder is higher than that of other cylinders, the fuel supply of this cylinder is higher; if the temperature is low, the fuel supply of this cylinder is less, or there is no fuel injection or fuel injection After that, it doesn't burn completely or doesn't burn.

（4）脉冲法：用手捏紧高压油管，感觉喷油时的脉动情况，脉动小，爆发声音弱，温度低的缸供油量偏小爆发声音不正常和温度高为喷油器喷油油压下降，喷油雾化不良，或不能及时着火和完全燃烧脉动大，爆发声音强，温度高的缸为供油量偏大爆发声音弱和温度低为喷油器孔或针阀卡死。

(4) Pulse method: pinch the high-pressure oil pipe by hand to feel the pulsation during fuel injection. The pulsation is small and the explosion sound is weak. The fuel supply of the cylinder with low temperature is small. The abnormal explosion sound and high temperature are the fuel injection oil pressure of the injector drops, the spray atomization is poor, or the ignition and complete combustion can not be carried out in time. The explosion sound is strong, and the cylinder with high temperature has large fuel supply, weak burst sound and temperature Low for injector hole or needle valve stuck.

（5）柴油发电机组断油法：为了准确判断哪缸有故障，可逐缸切断高压油管至喷油器油路，即停止工作，以观察柴油机工作情况的变化当切断某缸油路时，若柴油机转速和声音没有变化或变化不大，说明该缸工作正常如间断敲缸，排黑烟时，当切断某缸的油路后，故障现象消失。

(5) Fuel cut-off method of diesel generator set: in order to accurately judge which cylinder has fault, cut off the high-pressure oil pipe to the fuel injector cylinder by cylinder, that is, stop working, so as to observe the change of diesel engine working condition. When cutting off the oil circuit of a certain cylinder, if the speed and sound of the diesel engine do not change or change little, it indicates that the cylinder is working normally. For example, when the cylinder is knocked intermittently and the black smoke is discharged, after cutting off the oil circuit of a certain cylinder, The fault disappeared.