M11 Industrial Operation and Maintenance – Air Compressor Pumping Excess Lubricating Oil into the Air System

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Lubricating oil drain interval is excessive

Verify the correct lubricating oil drain interval. Refer to Procedure 102-002 (Maintenance Schedule) in Section 2.


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 010-024 (Air Leaks, Air Intake and Exhaust Systems) in Section 5.


Air compressor pumping time is excessive

Replace the desiccant cartridge on the air dryer (if equipped). 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 Compressors, 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 (Air Compressor Carbon Buildup) in Section 7.

Contact a Cummins Authorized Repair Facility

Last Modified:  18-Nov-2004