C7 Industrial Engine Operation and Maintenance Manual – Air Tank Moisture and Sediment – Drain – If Equipped

Moisture and sediment in the air starting system can cause the following conditions:


  • Freezing 
  • Corrosion of internal parts 
  • Malfunction of the air starting system
  1. Open the drain valve that is on the bottom of the air tank. Allow the moisture and sediment to drain.


  1. Close the drain valve.


  1. Check the air supply pressure. The air starting motor requires a minimum of 620 kPa (90 psi) of air pressure to operate properly. The maximum air pressure must not exceed 1550 kPa (225 psi). The normal air pressure will be 758 to 965 kPa (110 to 140 psi).
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