我分场有一台东风联合收割机的4115 T发动机,自从进场以来,有负荷或无负荷时排气管一直冒黑烟,马力不足,影响作业效率。到分场修理厂大修一次,故障未能排除。回到生产队后,首先检查高压油泵供油时间是否过晚、喷油量是否过多、喷油压力是否不足、喷油嘴头是否漏油,然后检查空气滤清器是否堵塞等,均未发现问题。那么故障原因在哪里呢?经细致检查发现,吸气管伸进导流板的位置太高,几乎要顶到集尘罩,这样势必造成发动机工作时进气量不足,但供油量未减,排气管就严重冒黑烟, I had a 4115 T Dongfeng Combine Harvester sub-field engine, since entering, with or without the exhaust pipe has been black smoke, lack of horsepower, affecting operating efficiency. To the sub-field repair shop overhaul, the failure can not be ruled out. Back to the production team, first check the high-pressure pump fuel supply time is too late, the amount of fuel injection is too much, the injection pressure is insufficient, the nozzle tip is spilled, and then check the air filter is blocked, etc., were not found problem. So where is the fault? After careful examination found that the intake manifold into the deflector position is too high, almost to the dust cover, it is bound to cause insufficient intake air when the engine work, but the amount of oil supply is not reduced , Exhaust pipe serious black smoke,