B5.9G, B5.9LPG, B Gas Plus, B LPG Plus – Air Compressor Noise is Excessive

Symptom Tree  

Air compressor mounting hardware is loose, worn, or broken

Check air compressor mounting hardware. Refer to the OEM service manual.


Air compressor is sending air pulses into the air tanks

Install a ping tank between the air dryer and the wet tank. Refer to the manufacturer’s instructions.


Ice buildup in the air system components

For all models, check for ice in low spots of the air discharge line, dryer inlet, and elbow fittings. On Holset® models, also check the Econ valve (if equipped). 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 Procedure 012-003 (Air Compressor Carbon Buildup) in Section 7.

Contact a Cummins Authorized Repair Facility

Last Modified:  15-Feb-2005