Cummins 4BT – Charge Air Cooler – Cleaning and Inspection

If the engine experiences a turbocharger failure or any other occasion where oil or debris is put into the CAC, the
CAC must be cleaned.
Remove the CAC from the vehicle. Refer to the vehicle manufacturer’s instructions. ”

Flush the CAC internally with solvent in the opposite direction of normal air flow. Shake the CAC and lightly tap
on the end tanks with a rubber mallet to dislodge trapped debris. Continue flushing until all debris or oil is removed.
Use a flashlight and mirror to visually inspect the CAC for internal debris.
Caution: If Internal debris cannot be removed, scrap the CAC.
Caution: Do not use caustic cleaners to clean the CAC.
Damage to the CAC w ill result.

After the CAC has been thoroughly cleaned of all oil and debris with solvent, wash the CAC internally with hot
soapy water to remove the remaining solvent. Rinse thor­oughly with clean water.
Blow compressed air into the CAC in the opposite direc­tion of normal air flow until the CAC is dry interanlly.

Visually inspect the CAC for cracks, holes or damage.
Inspect the tubes, fins and welds for tears, breaks or other damage, if any damage causes the CAC to fail the air leak
check mentioned earlier in this publication, the CAC must be replaced. Install the CAC on the vehicle. Refer to the
vehicle manufacturer for instructions.