Cummins ISX11.9 CM2250 – Service Manual 012-015   Air Compressor Discharge Lines

The air discharge line is supplied and connected directly to the engine’s air compressor by the vehicle 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 will connect the air discharge line to the ping tank and not directly to the air compressor.

This procedure covers the removal and installation of the noise reduction tank or ping tank and related components only.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

WARNING  Air discharge lines can be very hot. Make sure the lines are cool before touching to reduce the possibility of personal injury.

• Disconnect the batteries. Refer to the OEM service manual.
• Drain the vehicle air system. Refer to the OEM service manual.
• Disconnect the air compressor discharge line. Refer to the OEM service manual.

NOTE: Apply a counter-torque to the air compressor discharge fitting when loosening the discharge line.

Disconnect the air compressor discharge line between the air compressor and the ping tank.

Remove the discharge line.

Remove the three ping tank to fuel filter bracket mounting capscrews.

Remove the ping tank.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

NOTE: Inspect the OEM installed discharge line for carbon buildup. Refer to Procedure 012-003 in Section 12.

Clean the air compressor discharge line and ping tank with a strong solution of detergent.

Dry air compressor discharge line and ping tank with compressed air.

Inspect the air compressor discharge line and ping tank for any internal restrictions. Replace the component if any restrictions are found.

Inspect the air compressor discharge line for splits, cracks, hardening, or other damage.

Replace the component if any damage is found.

Inspect the “ping” tank for corrosion or cracks.

Replace the component if any damage is found.

Install the ping tank.

Refer to the OEM service manual for ping tank installation instructions.

NOTE: Apply a counter-torque to the air compressor discharge fitting when tightening the discharge line.

Install the air compressor to the ping tank discharge line.

Connect the air compressor discharge line between the air compressor and the ping tank.

Tighten the air compressor discharge line fittings.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Connect the air compressor discharge line. Refer to the OEM service manual.
• Connect the batteries. Refer to the OEM service manual.
• Operate the engine to normal operating temperature and check for leaks.