Symptom Tree t006
| Cause | Correction |
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Carbon buildup is excessive in the air discharge line, check valve, or cylinder head |
Check for carbon buildup. Replace the air compressor discharge line, if necessary. Check the turbocharger for oil leaks. Check the intake tube for oil. Refer to Procedures 012-003, 010-040 and 010-049. |
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Air compressor is sending air pulses into the air tanks |
Install a ping tank between the air dryer and the wet tank. Refer to the manufacturer’s instructions. |
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|
Accessory drive is worn (axial end play is out of specification) |
Check the accessory drive axial end play. Inspect the shaft for wear. Refer to the M11 Shop Manual, Bulletin 3666075, and Procedure 009-001. |
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Air compressor is excessively worn or internally damaged |
Replace or rebuild the air compressor. Refer to the manufacturer’s instructions and Procedure 012-014. |
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|
Air compressor timing is not correct |
Check the air compressor timing. Refer to Procedure 012-014. |
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Air compressor drive gear or engine gear train is worn or damaged |
Inspect the drive gears and gear train and repair as necessary. Refer to Procedures 001-036, 001-039, and 001-040. |
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|
Ice buildup in the air system components |
For all models, check for ice in low spots of the air discharge line, dryer inlet, and elbow fittings. On Holset® models, also check the Econ valve (if equipped). Refer to Master Repair Manual, Holset® Air Compressors, Bulletin 3666121. |
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|
Pin bore wear is excessive |
Check for pin bore wear. Refer to Procedure 012-010. |
