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柴油机敲缸原因及排除措施

2024-08-26

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柴油机在作业过程中出现敲缸的症状是:从中速到低速,会发出较重敲缸声,排气管冒黑烟,并时有放炮声或向外喷火,发动机机体过热。产生敲缸的原因主要有:

1、供油时间过早

当柴袖机活塞向上运动还没达到规定的喷油位置,喷油器就开始喷油,使燃油燃烧提前,气缸内的高压燃气冲击活塞,发出有节奏的“嗒、嗒”的清脆敲缸声,减小油门,敲缸声很明显。

排除方法是:调整供油提前角,即增加喷油泵与齿轮箱之间的垫片使供油时间延迟至符合规定的喷油时间。垫片每增加0.1毫米,供油提前角可延迟1.3-1.7。

2、燃油燃烧不良

喷油压力过低、喷油器滴油、喷油雾化不良以及供油时间过晚等都会造成燃油燃烧不良而引起敲缸。这类故障引起的敲缸声低沉、沙哑并伴有发动机过热、冒黑烟或排气管放炮、喷火等现象。应拆下喷油器进行检查和调整、调整供油时间,必要时更换新件,使之符合规定。

3、出油阀门磨损

出油阀磨损后,一方面使减压环带与阀座内孔配合间隙变大,密封性变差、减压效果变坏;另―方面高压油管内剩余压力过高,供油增加,引起燃油爆燃而敲缸.油门减小时敲缸声尤为明显。

排除方法是更换出油阀及阀座、需要提醒机手注意的是、技术状态完好的柴油机,在低速运转时,有时也会发出有节奏的敲击声,这是燃油燃烧过程中气流压力急剧升高产生的振动波引起的敲击,顺水是前面所提的敲缸。

来源:北内柴油机

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