Compression - Test
只能使用气缸压缩测试来比较一台发动机的各个气缸。气缸中的压力应在 300 至 500 kPa (43.5120 至 72.5200 psi)。如果一个或多个气缸的差力值超过 350 kPa (51 psi),则可能需要修理该气缸及其相关部件。
不应只使用压缩测试来确定发动机的状况。还应进行其它测试来确定是否需要调整或更换部件。
进行压缩性能测试之前,先确保存在下列条件:
- 蓄电池状况良好。
- 蓄电池已完全充电。
- 起动马达工作正常。
- 气门间隙设定值正确。
- 已拆卸所有喷油器。
- 已断开供油管。
- 将气缸压力测量表安装在喷油器的孔中。
- 运行起动马达来拖动发动机。记录压缩表上显示的最大压力。
- 对所有气缸重复步骤 1 和 2。
Caterpillar Information System:
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