Symptom Tree t007
| Cause | Correction |
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Air intake system restriction to air compressor is excessive |
Replace the air compressor air cleaner (if installed). Check the air intake piping. Check engine air intake restriction if the air compressor inlet is plumbed to the vehicle or equipment intake system. Refer to Procedure 010-031. |
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Contaminants are building up in the system reservoirs |
Drain the reservoirs daily. Refer to the Operation and Maintenance Manual, Operation and Maintenance Manual, B5.9G, B5.9LPG, B Gas Plus, and B LPG Plus Engines, Bulletin 3666112. |
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Lubricating oil pressure is above specification |
Check the oil pressure. Refer to Procedure 007-052 or the OEM service manual. |
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Lubricating oil drain line is restricted |
Remove the air compressor and check the oil drain holes in the air compressor and the accessory drive. Refer to Procedure 012-014. |
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Air compressor pumping time is excessive |
Replace the desiccant cartridge on the Turbo/CR 2000 air dryer. Refer to the OEM service manual. Check the air compressor duty cycle. Install a larger air compressor, if necessary. Refer to the Master Repair Manual, Holset® Air Compressor, Bulletin 3666121. |
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Crankcase pressure is excessive |
Check for excessive blowby. Refer to the Crankcase Gases (Blowby) Excessive symptom tree. |
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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 and 010-049. |
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Air compressor runs hot |
If coolant temperature is above normal, refer to the Coolant Temperature Above Normal – Gradual Overheat symptom tree. |
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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 the Master Repair Manual, Holset® Air Compressor, Bulletin 3666121. |
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E-type system is not plumbed correctly |
Install an Econ valve, a check valve, and system hoses. Refer to the Master Repair Manual, Holset® Air Compressor, Bulletin 3666121, and Procedure 010-033. |
