C4.4 and C7.1 Engines Caterpillar


Valve Lash Is Excessive

Usage:

525D 2L5

可能原因

  • 润滑

  • 配气机构部件

  • 气门间隙

建议的措施

注: 下面以概率的先后顺序列出了这些步骤。 依次完成这些步骤。

表 1
故障诊断与排除测试步骤  数值  结果 

1. 润滑

A. 拆下气门机构盖。 请参考拆解和组装, "气门机构盖 - 拆卸和安装"以了解正确步骤。

B. 让发动机盘车,检查阀门室中的润滑情况。 确保阀门室中有足够的发动机机油流量。 发动机机油通道必须清洁。

注:气门机构盖拆下时,不要运转发动机。
 

润滑
 

结果:气门机构的油流不足。

修理:确保发动机机油油道清洁。

结果:气门机构的油流正常。

转至测试步骤 2。
 

2. 配气机构部件

A. 检查配气机构的下述部件有无异常或过度磨损,平直度和清洁度如何:

· 摇臂
· 气门桥
· 推杆
· 气门挺杆
凸轮轴·
· 气门杆
· 摇臂轴
 

配气机构部件
 

结果:配气机构部件磨损、弯曲或不清洁。

修理:修理或更换部件。 参考拆解和装配。

注:如果更换凸轮轴,则也必须安装新的气门挺杆。

结果:所有配气机构部件正常。

转至测试步骤 3。
 

3. 气门间隙

A. 检查发动机的气门间隙。
 

气门间隙
 

结果:气门间隙不符合技术规格。

修理:调整发动机的气门间隙。 有关正确的步骤,请参阅系统操作、测试和调整, "发动机气门间隙 - 检查/调整"。

结果:气门间隙符合技术规格。

请联系代理商解决方案网络 (DSN)。
 

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