C0.5, C0.7, C1.1/3011C, C1.5/3013C, C1.6 and C2.2/3024C/3024CT Industrial Engines and Engines for Caterpillar Built Machines Caterpillar


Compression - Test

Usage:

CB-214E 214


压缩

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 

以下情况可影响油缸压缩测试的结果:

  • 蓄电池

  • 起动马达状况

  • 环境情况

  • 压缩表的质量


图 1g00564993
检查发动机的压缩

  1. 测量某气缸压缩时从气缸上拆下喷油嘴。

  2. 连接一个压缩表到气缸。

  3. 断开燃油切断阀,或者将调速器止动杆固定到发动机停运位置。

  4. 操作起动马达并记录压缩表的压力。

  5. 对每个气缸重复此过程。

    注: 压缩测试仅适用于同一发动机的气缸之间压力比较。 若一个或多个气缸差值超过 350 kPa (51 psi),则这些气缸可能损坏。

    注: 气缸压缩测试不应当成为确定发动机状况的唯一测试。

    表 2
      组装时的标准值  修理限值 
    压缩压力(1)  2940 kPa (426 psi)  2450 kPa (355 psi) 
    (1) 压缩压力在 250 rpm 时测量。

  6. 若压缩压力低于修理限值,则采取维修。


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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