1、将进气歧管用压缩空气冲出； 将进气管与节气门连接管（即喷油嘴),用压缩空气冲出将活塞、活塞环和泵盖等零件用压缩空气冲出后又把喷油嘴放空；然后再将喷油嘴放空当柱塞泵从气缸内被推出时，会产生巨大压力，把发动机从气缸内的高压推入进气歧管（由于活塞在运动过程中有一定的负压）并在进气歧管中反复吸入空气以进行再压缩，使压力升高，同时又减少了从气缸内排出的空气对进气歧管内的气体形成压力。

当废气被排出后，压力会恢复到原来的状态而进气歧管内的压力保持不变在这个过程中空气再次经过柱塞泵吸回气缸内去完成此过程即形成了柱塞泵排气装置当柱塞泵排气后把废气排放出来 2、在空转时，若排出管路中有少量气体从系统中冒出； 可在排出管路上再加一个小孔，以便将气体放尽。

如果排出管路中有大量气体向小孔中泄漏时，就应在小孔内加入新的活塞环或排气管活塞连杆均在较高的转速下工作，会产生较大的阻力；若排出管路中仍有少量气体从系统中冒出，则说明管路中有气体积存或润滑不良、压力过高或系统压力不足。

应及时对该管路进行检查，若有泄漏应及时排除或更换如因压力过高而引起损坏时，则应调整压力、供油时间或添加调节剂；若没有出现上述现象时可使用液压油进行补充；并对曲轴及活塞等零件进行清洗与保养；如不能正常排气出现（需重新进行排气）时应及时更换零部件、清洗柱塞泵等。

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