Cummins N14 STC, Celect, Celect Plus – Service Manual Air Compressor Pumping Excess Lubricating Oil into the Air System

Symptom Tree  t007

This is symptom tree
Cause Correction

Lubricating oil drain interval is excessive

Verify the correct lubricating oil drain interval. Refer to Procedure 102-002 in Section 2 of the N14 Plus Operation and Maintenance Manual, Bulletin 3666136.

 

Air intake system restriction to air compressor is excessive

Replace the air compressor air cleaner, if installed. Check the air intake piping. Check the engine air intake restriction if the air compressor air inlet is plumbed to the vehicle or equipment intake system. Refer to Procedure 010-031 in Section 10.

 

Contaminants are building up in the system reservoirs

Drain the reservoirs daily. Refer to Procedure 012-021 in Section 3 of the N14 Plus Operation and Maintenance Manual, Bulletin 3666136. For applications fitted with selective catalytic reduction exhaust systems, check the air supply line and the inline air filter on the air supply line to the dosing control unit for contamination.

 

E-type system is not plumbed correctly

Install an Econ valve, a check valve, and system hoses. Refer to the Holset® Air Compressors Master Repair Manual, Bulletin 3666121.

 

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 Holset® Air Compressors Master Repair Manual, Bulletin 3666121.

 

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. Refer to Procedure 012-003 in Section 12 and Procedure 010-040 and Procedure 010-049 in Section 10.

 

Engine angularity during operation exceeds specification

Refer to the engine specification data sheet.

 

Crankcase pressure is excessive

Check for excessive blowby. Refer to the Crankcase Gases (Blowby) Excessive troubleshooting symptom tree in Section TS.

 

Lubricating oil pressure is above specification

Check the oil pressure. Refer to Procedure 007-028 in Section 7.

 

Air compressor runs hot

If coolant temperature is above normal, refer to the Coolant Temperature Above Normal – Gradual Overheat troubleshooting symptom tree in Section TS.

 

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 in Section 12.

 

Air compressor is excessively worn or internally damaged

Replace or rebuild the air compressor. Refer to Procedure 012-014 in Section 12 and the Holset® Air Compressors Master Repair Manual, Bulletin 3666121.

 
Last Modified:  19-Jan-2012