B5.9G, B5.9LPG, B Gas Plus, B LPG Plus, and B Gas International Engines – Air Compressor Pumping Excess Lubricating Oil into the Air System

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 010-059 (Air Cleaner Restriction) in Section 4.

Lubricating oil pressure is above specification

Check the oil pressure. Refer to Lubricating Oil Pressure High symptom tree.

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 a Cummins Authorized Repair Facility.

Crankcase pressure is excessive

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

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.

Air compressor runs hot

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