Replace the PCV valve on the 6.7L Cummins diesel engine to restore proper crankcase ventilation and prevent oil leaks or excessive crankcase pressure.

Warnings

Tools required

Parts

• PCV valve × 1 — Use OEM Mopar specification for 6.7L Cummins
• PCV valve grommet/seal × 1 — Often included with PCV valve

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow engine to cool completely
3. Open hood and secure with prop rod
4. Locate PCV valve on driver side valve cover near the front of the engine

Procedure

1. 1

   Disconnect PCV hose
   Locate the PCV valve on the driver side valve cover. Disconnect the crankcase ventilation hose from the PCV valve by gently pulling it off or releasing any retaining clip. Note the routing of the hose for reinstallation.
2. 2

   Remove old PCV valve
   Using a socket or appropriate tool, carefully unscrew the PCV valve from the valve cover in a counterclockwise direction. If the valve is stuck, gently rock it back and forth while turning. Remove the valve and inspect the grommet or seal that remains in the valve cover.
3. 3

   Inspect valve cover opening
   Clean the PCV valve mounting area on the valve cover with a clean shop rag. Remove the old grommet or seal if it did not come out with the valve. Inspect the mounting hole for any debris or oil buildup and clean thoroughly.
4. 4

   Install new grommet
   If a new grommet or seal is provided with the replacement PCV valve, install it into the valve cover mounting hole. Ensure it is fully seated and properly positioned before installing the valve.
5. 5

   Install new PCV valve
   Thread the new PCV valve into the valve cover by hand, ensuring it starts smoothly without cross-threading. Once hand-tight, use a torque wrench to tighten to specification. The valve should be snug but not over-tightened as it threads into aluminum.
   Torque spec

   PCV Valve8 Nm (6 lb-ft)
6. 6

   Reconnect ventilation hose
   Reconnect the crankcase ventilation hose to the new PCV valve, ensuring it is fully seated. Secure any retaining clips if equipped. Verify the hose routing matches the original configuration and has no kinks or sharp bends.

Reassembly

1. Double-check all connections are secure and hose is properly routed
2. Verify no tools or rags were left in engine compartment

Verification

• Start engine and allow to idle for 2-3 minutes
• Check for any unusual hissing sounds or vacuum leaks around the PCV valve
• Verify no oil leaks around the PCV valve mounting area
• Confirm engine idles smoothly without rough running or excessive smoke
• Check that crankcase ventilation hose connections are secure with no oil weeping

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