ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – Air Compressor Pumping Excess Lubricating Oil into the Air System

Lubricating oil drain interval is excessive

Verify the correct lubricating oil drain interval. Refer to Section 2 in the Operation and Maintenance Manual, ISC, ISC^e, ISL Engines, Bulletin 4021428, or Operation and Maintenance Manual, QSC8.3 and QSL9 Engines, Bullletin 4021518, or Operation and Maintenance Manual, ISLe3 and ISLe4 Engines, Bullletin 4021557.

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.

Contaminants are building up in the system reservoirs

Drain the reservoirs daily. Refer to Section 2 in the Operation and Maintenance Manual, ISC, ISC^e, ISL Engines, Bulletin 4021428 or Operation and Maintenance Manual, QSC8.3 and QSL9 Engines, Bullletin 4021518. 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 OEM service manual.

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 OEM service manual.

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 Procedures 010-033.

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 symptom tree.

Lubricating oil pressure is above specification

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

Air compressor runs hot

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

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.

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 Procedure 012-014.

Air compressor pumping too high air pressure

Check the air governor for correct operation. Refer to the OEM service manual.

Air compressor is excessively worn or internally damaged

Replace or rebuild the air compressor. Refer to Procedure 012-014 and the OEM service manual.