柴油发电机组燃油供给系统确无故障后，这时候我们可以根据检查中对燃烧、压缩方面是否出现的异常情况进行诊断分析。我们在观察的过程中，当起动时听到进排气管内有“嗤嗤”气流声，这就说明进排气门有漏气现象。其实造成进排气门漏气的原因有：气门间隙调整不当或气门间隙过小。如果减压阀调整过紧会造成气门关闭不严而漏气，在排除这方面故障后，应对气门漏气等件进行检查，气门漏气的主要原因有：玉扬动力潍坊柴油发电机组小编给您分析：

After confirming that there are no faults in the fuel supply system of the diesel generator set, we can diagnose and analyze whether there are any abnormal situations in the combustion and compression aspects during the inspection. During our observation, when starting, we hear a "hissing" sound of airflow inside the intake and exhaust pipes, which indicates that there is air leakage in the intake and exhaust valves. In fact, the reasons for air leakage in the intake and exhaust valves are: improper adjustment of valve clearance or too small valve clearance. If the pressure reducing valve is adjusted too tightly, it will cause the valve to close loosely and leak air. After troubleshooting this issue, it is necessary to inspect the valve leakage and other components. The main reasons for valve leakage are: Yuyang Power Weifang Diesel Generator Set Editor will analyze for you:

1、气门与气门座的密封环带烧蚀；

1. The sealing ring of the valve and valve seat is burned out;

2、气门与气门座的密封环带过宽或者密封环带沾有杂物；

2. The sealing ring of the valve and valve seat is too wide or contaminated with debris;

3、气门杆积碳严重，咬合导管，气门杆弯曲，造成气门关闭不严；

3. Severe carbon accumulation on the valve stem, biting the guide tube, and bending the valve stem, causing the valve to not close tightly;

4、气门弹簧断裂，或者弹性变弱；

4. Valve spring fracture or weakened elasticity;

5、气门杆与导管因磨损严重而配合间隙超限。

5. The clearance between the valve stem and guide tube exceeds the limit due to severe wear.

供油提前角不准确。调整时松开喷油泵上三只固定螺母，适当调整喷油泵的装配角度，供油时间过迟将喷油泵上部往机体方向转动，供油时间过早将油泵上部向外转动。若是转动到极限仍不能调准供油时间，则齿轮装配上有错误。

The fuel supply advance angle is not accurate. During adjustment, loosen the three fixing nuts on the fuel injection pump, and properly adjust the assembly angle of the fuel injection pump. If the fuel supply time is too late, rotate the upper part of the fuel injection pump toward the engine body, and if the fuel supply time is too early, rotate the upper part of the fuel injection pump outward. If the oil supply time cannot be adjusted even after reaching the limit, there is an error in gear assembly.

（1）记号对错，记号对错油两种可能，一是齿轮记号打错位置；二是装配中没有依照齿轮上的记号一一对位。油泵内凸轮轴的磨损也会影响供油时间，这种故障必须有专业知识的人员修理。

(1) There are two possibilities for the mark to be right or wrong, one is to mark the gear in the wrong position; Secondly, during assembly, there was no one-to-one alignment according to the markings on the gears. The wear of the camshaft inside the oil pump can also affect the fuel supply time, and such faults must be repaired by personnel with professional knowledge.

（2）喷油泵齿轮键槽没有对准油泵轴上的半圆键。

(2) The gear keyway of the fuel injection pump is not aligned with the half circle key on the oil pump shaft.

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