Dodge Cummins 6.7 EGR cleaning

Introduction

This tutorial provides step-by-step instructions for cleaning the EGR (Exhaust Gas Recirculation) valve on a Dodge Cummins 6.7-liter diesel engine. Cleaning the EGR valve is essential for maintaining engine performance and addressing issues related to EGR codes. This process is also part of the major service due every 67,500 miles.

Step 1: Remove the Upper Plastic Engine Cover

• Start by removing the oil dipstick to access the engine cover.
• Unscrew the four 8mm bolts that secure the upper plastic engine cover.
• Carefully lift the cover off to expose the EGR valve assembly and the crossover pipe.

Step 2: Disconnect the EGR Valve

• Locate the electrical connector for the EGR solenoid and disconnect it.
• Unscrew the four 10mm bolts that hold the EGR valve in place.
• Loosen the V-band clamp (11mm) that connects the crossover pipe to the EGR valve.
• Gently tap the EGR valve to free it from the gaskets, then remove it from the vehicle.

Step 3: Remove the EGR Solenoid

• Take the EGR valve to your workbench for further disassembly.
• Unscrew the four Phillips screws securing the EGR solenoid.
• Remove the thin metal gasket; this gasket is reusable.

Step 4: Disassemble the EGR Valve

• Once the solenoid is removed, you’ll see the spring, retainer, and keepers.
• Place a rag in the lower EGR valve opening to prevent it from opening while compressing the spring.
• Carefully remove the keepers, keeping track of them since they are small and can be easily lost.

Step 5: Clean the EGR Valve

• With the EGR valve disassembled, pour EGR cleaning fluid into the valve ports.
• Position the valve to hold as much fluid as possible.
• Let the cleaning fluid sit for 2-4 hours to effectively dissolve carbon deposits.
• After soaking, rinse the valve thoroughly until no cleaner remains.
• Allow the valve to air dry completely.

Step 6: Reassemble the EGR Valve

• Once dry, reinsert the spring, retainer, and keepers.
• Use the rag in the lower port again to maintain tension while you work.
• Apply a small amount of grease to the area where the keepers will be placed to hold them in position.
• Remove the rag and gently press on the valve to ensure smooth operation.

Step 7: Reinstall the EGR Solenoid

• Reattach the electrical solenoid and the thin metal gasket to the EGR valve.

Step 8: Reinstall the EGR Valve

• Clean all old gasket material from the mounting surface to ensure a proper seal.
• Use compressed air to blow out any soot and debris.
• Reinstall the EGR valve by reversing the removal steps:
  • Secure the valve with the four 10mm bolts.
  • Reconnect the V-band clamp and tighten it.
  • Reconnect the electrical connector.

Conclusion

Cleaning the EGR valve on a Dodge Cummins 6.7-liter engine is a straightforward process that can improve engine performance and longevity. Regular maintenance, including EGR cleaning, is crucial for optimal function. After completing this task, monitor your vehicle for any EGR-related codes and ensure smooth operation. If problems persist, consider consulting a professional technician.