The paper discusses the cause of the unusual exhaust of diesel. It is of practical significance to the improvement of equipment availability and service life and the reduction of maintenance cost.

分析工程机械用柴油机排气异常的原因，对提高设备利用率及使用寿命和减少维修费用有实际意义。

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Thanks to the said improvement, operation of the plug bar positioning adjustment has become much easier, die tooling consumption lower and equipment availability higher.

改进后顶杆的调整定位操作容易，模具消耗低，设备有效作业率提高。

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