Catalytic Converter Pressure - Test
注: 本手册涉及 CG137-8 和 CG137-12 发动机。 与空燃比控制和催化剂有关的材料仅适用于 CG137-12 发动机。 这些系统由 Caterpillar 提供，仅适用于 CG137-12。 CG137-8 系统由客户提供。
排气压力过高会导致排气温度过高。 排气温度过高可能损坏催化转化器的基体涂层。 检查排气压力以便确认排气系统设计正确。
以下因素可能会导致催化剂堵塞：
- 初始发动机设置时碎屑落入催化剂
- 积碳结构在基体上形成沉积物
- 使用不正确的发动机机油造成的粉末状灰色 / 白色烟灰
- 发动机缺火和 / 或回火导致碎屑落入催化剂
排气压力是在发动机在额定转速和满载条件下运行时测量的。 使用水柱压力计或者机械压力表测量排气压力。
总排气压力从转化器进口壳体的测试端口处测量。 总排气压力是发动机排气歧管和转化器之间的压力。
这些发动机可接受的总排气压力。 ... 6.75 kPa (0.98 psi)
检查出口处的排气压力以便计算转化器上的压差。 这一压差会提供有关催化剂堵塞的信息。 催化转化器后面的压力从转化器出口壳体的测试端口处测量。
这些发动机催化转化器上的最大压差 ... 2.25 kPa (0.33 psi)
如果怀疑催化转化器有故障，请参阅下列章节中的信息以识别故障。
参考系统操作, "催化转化器"
参考测试与调整, "催化转化器性能 - 测试"
参考测试与调整, "催化转化器基体 - 检查"
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