6.7L Cummins Compressed Air System – Air Compressor Discharge Lines – General Information

The air discharge line is supplied and connected directly to the engine’s air compressor by the vehicles OEM.
For some applications, a noise reduction tank or “ping” tank has been installed on the engine to reduce air
compressor pumping noise. If the engine is equipped with a “ping” tank, the OEM would connect the air discharge
line to the “ping” tank and not directly to the air compressor.
The procedure covers the removal and installation of the noise reduction tank or “ping” tank and related components only.