(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：當發動機正常工作，從淺灰色的排放量，負荷大，有點深如排黑氣，表明可燃氣體不完全燃燒排藍焰的潤滑油進入氣缸燃燒白煙行，那么就在柴油機水，燃燒的可燃氣體，也是白煙行連續排放廢氣排放不尋常的顏色，這表明設備工作不正常。

(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）柴油發電機組感溫法：在柴油機啟動后的更初階段（工作一段時間后排氣管溫度很高，用手觸摸會燙傷）用手摸各缸排氣管的溫度，可鑒別各缸工作情況如果各缸排氣管的溫度比其他缸高，說明該缸供油量偏高；若溫度低，則該缸供油量少、或不噴油、或噴油后沒完全燃燒或不燃燒。

(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）脈沖法：用手捏緊高壓油管，感覺噴油時的脈動情況，脈動小，爆發聲音弱，溫度低的缸供油量偏小爆發聲音不正常和溫度高為噴油器噴油油壓下降，噴油霧化不良，或不能及時著火和完全燃燒脈動大，爆發聲音強，溫度高的缸為供油量偏大爆發聲音弱和溫度低為噴油器孔或針閥卡死。

(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）柴油發電機組斷油法：為了準確判斷哪缸有故障，可逐缸切斷高壓油管至噴油器油路，即停止工作，以觀察柴油機工作情況的變化當切斷某缸油路時，若柴油機轉速和聲音沒有變化或變化不大，說明該缸工作正常如間斷敲缸，排黑煙時，當切斷某缸的油路后，故障現象消失。

(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.