Oil Contains Fuel
务必确认燃油稀释。 向 Caterpillar 区域 SOS 试验室提交油样，以进行分析。
注: 有关更多信息，请参阅专门说明书, REHS3007, "确定发动机机油被燃油稀释的原因"。
- 密封件泄漏
- 喷油器尖端
- 输油泵密封件
- 缸盖裂纹
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。
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| 故障诊断与排除测试步骤 | 数值 | 结果 |
|---|---|---|
1. 密封件泄漏 A. 拆下相关气缸上的喷油器后肉眼检查喷油器 O 形密封圈是否损坏。 如果发现有泄漏但 O 形密封圈状态良好，则喷油器可能有故障。 更换喷油器。 确保安装了新的调整文件。 有关详细信息，参考故障排除, "喷油器调整文件 - 安装"。 使用 Caterpillar 电子技师（ET）执行 "Fuel System Verification Test（燃油系统验证测试）"。 有关详细信息，参考故障排除, "喷油器电磁阀 - 测试"。 如果未找到泄漏部位，则向燃油箱中加入适当的染料。 使发动机在高怠速下运转数分钟。 关闭发动机，然后拆下阀室盖。 使用黑光在各喷油器周围检查染料的痕迹。 |
O 形密封圈 |
结果：喷油器 O 形密封圈损坏。 修理：更换损坏的密封。 将喷油器安装到发动机上，然后确认修理已将故障排除。 结果：喷油器 O 形密封圈未损坏。 转至测试步骤 2。 |
2. 喷油器顶端 A. 使用 Cat 电子技师执行 "Cylinder Cutout Test（断缸测试）"，以便识别出可能漏油的所有气缸。 B. 已损坏或断裂的喷油器顶端可能会引起气缸漏油。 如果通过测试识别出该缸，则拆卸喷油器并检查喷油器顶端有无损坏。 检查喷油器顶端有无裂纹或破裂。 |
喷油器顶端 |
结果：喷油器顶端损坏。 修理：更换可疑喷油器。 结果：喷油器顶端未损坏。 转至测试步骤 3。 |
3. 输油泵密封件 A. 检查输油泵的轴密封件周围有无燃油泄漏。 确保溢流孔未被堵塞。 |
泵密封件 |
结果：轴密封件周围有燃油泄漏。 修理：更换燃油输油泵。 结果：轴密封件周围无燃油泄漏。 继续测试步骤 4。 |
4. 缸盖裂纹 A. 查看缸盖内的喷油器燃油供应内部通道有无损坏迹象。 查找有无销孔泄漏。 参考拆解和装配。 |
缸盖裂纹 |
结果 喷油器燃油供应内部通道损坏。 修理：修理或更换缸盖。 |
Caterpillar Information System:
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