CG137-08 and CG137-12 Industrial Engines Caterpillar


Compression - Test

Usage:

CG137-08 FPL

表 1
所需工具    
零件号     说明     数量    
193-5859     气缸压力表总成 (燃气发动机)     1    

气缸压力可在检查火花塞测量。 可通过检查气缸压力测试下列各项的状况:气门, 气门座圈, 活塞, 活塞环 和 缸套。

一个或多个气缸的压力下降或变化可能表示下列状况。 这些状况可能表示存在润滑故障:

  • 积碳过多

  • 气门故障或断裂

  • 活塞环卡滞或断裂

  • 活塞环磨损

  • 缸套磨损

约 250 工作小时后,测量发动机气缸压力。 记录该数据。 连续定期测量气缸压力。 将记录的数据与新的数据相比较可提供有关发动机状况的信息。

注: 气缸压力是帮助确定大修周期的考虑因素之一。 有关详细信息,请参阅您发动机的操作和保养手册。

如果气缸压力提高是由于一个或多个气缸压缩比的原因,发动机需要进行上部大修,以清除积碳。 不清除沉积物,会增加爆震的机会。 将会产生严重的气门沟槽。

使用 193-5859 气缸压力表总成 (燃气发动机)来测量气缸压力。 使用仪表所带的专门说明书, NEHS0798。 按照下列指南进行:

  • 拆下全部火花塞。

  • 完全打开油门板。

  • 尽可能缩短起动时间。 此策略将使检查时的连续起动速度达到最大。 另外,也能节省蓄电池的电力。

图 1 是具有不同压缩比的发动机的气缸压力近似图。 参考此图。




图 1g02417877

燃气发动机气缸压力近似图

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