C4.2 and C6.4 Engines for Caterpillar Built Machines Caterpillar


Compression - Test

Usage:

320D A6F

表 1
所需工具    
零件号     零件名称     数量    
9U-6274     压缩测试工具总成     1    

以下情况可影响气缸压缩测试的结果:

  • 蓄电池

  • 起动马达的情况

  • 环境情况

  • 压缩表的质量




图 1g01367082

检查发动机的压缩

  1. 断开主线束与继电器接头的接头。

  1. 断开高压泵电磁阀与高压泵电磁阀上传感器的连接。

  1. 选择一个气缸。 卸下气缸中的喷油器。

  1. 在喷油器的位置中安装仪表的适配器。 将压缩表安装到仪表的适配器上。

  1. 使用起动马达来起动发动机。 以指定的转速运行发动机。 读取仪表读数。

  1. 如果测量值处于极限或极限之下,请对发动机进行大修。

    表 2
        组装时的标准值     修理限值    
    压缩压力 (1)    
    2940 kPa (427 psi)    

    2650 kPa (384 psi)    
    ( 1 ) 压缩压力在 200 rpm 时测量。


注意

确定要测量到所有气缸的压缩。没有检查所有气缸可能会导致错误的诊断结果。压缩压力是随着发动机转速变化的。因此有必要在对所有气缸进行压缩的读数时保证发动机转速不变。


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