GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Mechanical - 6.6L 🢒 Positive Crankcase Ventilation Valve Replacement

Removal Procedure

    Object Number: 813243 Size: SH
  1. Loosen the outlet duct clamp at the upper intake manifold cover.
  2. Remove the upper intake manifold cover from the outlet duct.
  3. Remove the upper intake manifold cover.

    4. Object Number: 813244 Size: SH
  4. If removing the right side, loosen the outlet duct clamps at the turbocharger and the mass air flow/intake air temperature (MAF/IAT) sensor.
  5. Remove the outlet duct from the turbocharger and the MAT/IAT sensor.

    6. Object Number: 664851 Size: SH

    Important: After removing the turbocharger air ducts and hoses, cover the turbocharger openings and the ducts with tape to prevent entry of objects.

  6. If removing the right side, loosen both charged air cooler outlet duct to intake hose clamps.

    7. Important: Do not use a screw driver or other tool to pry the hose loose. The hose can be torn or damaged. Loosen the hose by twisting.

  7. Remove the charged air cooler outlet duct to intake hose.

    8. Object Number: 664853 Size: SH
  8. If removing the left side, loosen the charged air cooler inlet duct to turbocharger clamp.

    9. Important: Do not use a screw driver or other tool to pry the hose loose. The hose can be torn or damaged. Loosen the hose by twisting.

  9. Remove the charged air cooler inlet duct to turbocharger cool air outlet hose from the turbocharger. The hose can stay on the pipe.

    10. Object Number: 665386 Size: SH
  10. In order to access the right side remove the heater outlet hose bracket and nut (1).
  11. Remove the heater outlet hose bracket bolt (2).
  12. Move the heater hose out of the way.

    13. Object Number: 663631 Size: SH
  13. Remove the screws retaining the PCV diaphragm cover to the valve rocker arm cover.
  14. Remove the diaphragm cover.
  15. Remove the diaphragm and the spring.
  16. Clean the diaphragm cover, spring, and screws.
  17. Inspect the diaphragm for cuts or damage.
  18. Discard the diaphragm if damage is found.

Installation Procedure

    Object Number: 663631 Size: SH
  1. Install the spring, diaphragm and cover to the valve rocker arm cover.

    2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2. Install the PCV diaphragm cover screws.

    3. Tighten
    Tighten the PCV diaphragm cover screws to 4 N·m (35 lb in).


    Object Number: 665386 Size: SH
  3. Re-position the heater hose.
  4. Install the heater outlet hose bracket nut (1).

    5. Tighten
    Tighten the nut to 9 N·m (80 lb in).

  5. Install the bolt (2) retaining the heater outlet hose to the generator bracket.

    6. Tighten
    Tighten the heater hose bracket bolt to 25 N·m (18 lb ft).


    Object Number: 664853 Size: SH
  6. Install the charged air cooler inlet duct to turbocharger cool air outlet hose to the turbocharger.
  7. Position the clamp as shown for proper clearance.

    8. Tighten
    Tighten the clamp to 6 N·m (53 lb in).


    Object Number: 664851 Size: SH
  8. Install the charged air cooler outlet duct to intake hose.

    9. The hose is marked DUCT which connects to the charged air cooler outlet duct.

    The hose is marked ENG which connects to the intake manifold duct.

    Align the marks on the hose with the alignment marks on the pipe and duct.

  9. Position the clamps as shown for proper clearance.

    10. Tighten
    Tighten the clamps to 6 N·m (53 lb in).


    Object Number: 813246 Size: SH

    Important: The outlet duct must be fully seated against the positive stop feature on the turbocharger inlet.

  10. Install the outlet duct to the turbocharger.
  11. Align the outlet duct alignment indicator (1) to the turbocharger alignment indicator (2).

    12. Object Number: 813244 Size: SH

    Important: The outlet duct must be fully seated against the MAF/IAT sensor with the edge of the seal in the vertical position.

  12. Install the outlet duct to the MAT/IAT sensor.
  13. Tighten the outlet duct clamps at the turbocharger and the MAF/IAT sensor.

    14. Tighten
    Tighten the clamps to 6 N·m (53 lb in).


    Object Number: 813243 Size: SH
  14. Install the upper intake manifold cover .
  15. Install the upper intake manifold cover to the outlet duct.
  16. Tighten the outlet duct clamp at the upper intake manifold cover.

    17. Tighten
    Tighten the clamp to 6 N·m (53 lb in).