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故障现象一台配装于长江牌25t吊车上的康明斯NTC-290发动机,系采用PT燃油系统的柴油机。该发动机起动正常,在冷车状态下,运转5～6 min,发动机逐渐熄火;在热车状态下,运转2～3min就逐渐熄火。但是在熄火之前,无论是怠速还是高速运转,加油均正常。故障检查诊断根据故障现象,首先检查油路是否有漏气的地方,燃油滤清器是否堵塞,燃油箱中燃油是否足够或是否有水,以及是否有棉纱之类的东西逐渐堵住燃油箱的出油管口等。上述检查均没有发现问题。然后检查油路控制部分。检查熄火
Symptom A Cummins NTC-290 engine equipped with a 25t crane on the Yangtze River is a diesel engine with a PT fuel system. The engine starts normally, in the cold state, running 5 ~ 6 min, the engine gradually flameout; in the hot car state, running 2 ~ 3min gradually flameout. However, before the flameout, whether it is idle or high-speed operation, refueling are normal. Fault diagnosis According to the fault phenomenon, first check whether the oil leaks, the fuel filter is clogged, the fuel tank is enough fuel or whether there is water, and whether there is cotton yarn and the like gradually plugging the fuel tank Oil outlet and so on. The above examination found no problem. Then check the oil control section. Check flameout