GM Service Manual Online
For 1990-2009 cars only

Turbocharger Exhaust Pipe Replacement 6.6L (LLY) Engine

Removal Procedure


    Object Number: 668379  Size: SH
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Loosen the exhaust manifold pipe clamp.
  3. Slide the exhaust pipe clamp up onto the exhaust pipe.

  4. Object Number: 694338  Size: SH
  5. Remove the exhaust muffler nuts.

  6. Object Number: 694896  Size: SH
  7. Slide the exhaust manifold pipe hanger out from the insulator.
  8. Remove the exhaust manifold pipe.

  9. Object Number: 702776  Size: SH
  10. If equipped with an automatic transmission, remove the transmission fluid fill tube to bellhousing nuts.
  11. Position the transmission fluid fill tube to the right side of the vehicle. The tube does not require removal from the transmission.
  12. Lower the vehicle.

  13. Object Number: 310799  Size: SH
  14. Move the hood to the service position by moving the hood hinge bolts (1) to the service position (2).
  15. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement in Engine Mechanical - 6.6L (LLY).

  16. Object Number: 1335576  Size: SH
  17. Remove the turbocharger upper heat shield bolts.
  18. Remove the turbocharger upper heat shield.

  19. Object Number: 1334821  Size: SH
  20. Remove the exhaust outlet heat shield bolts.
  21. Remove the exhaust outlet heat shield.
  22. Remove the exhaust outlet to right exhaust pipe bracket bolt.

  23. Object Number: 1334826  Size: SH
  24. Loosen the exhaust outlet pipe clamp.

  25. Object Number: 1341232  Size: SH
  26. Remove the exhaust outlet pipe.

Installation Procedure


    Object Number: 1341232  Size: SH
  1. Install the exhaust outlet pipe.
  2. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1334826  Size: SH
  3. Tighten the exhaust outlet pipe clamp.
  4. Tighten
    Tighten the clamp to 15 N·m (11 lb ft).


    Object Number: 1334821  Size: SH
  5. Install the exhaust outlet to right exhaust pipe bracket bolt.
  6. Tighten
    Tighten the bolt to 34 N·m (25 lb ft).

  7. Install the exhaust outlet heat shield.
  8. Install the exhaust outlet heat shield bolts.
  9. Tighten
    Tighten the bolts to 8 N·m (71 lb in).


    Object Number: 1335576  Size: SH
  10. Install the turbocharger upper heat shield.
  11. Install the turbocharger upper heat shield bolts.
  12. Tighten
    Tighten the bolts to 9 N·m (80 lb in).

  13. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement in Engine Mechanical - 6.6L (LLY).

  14. Object Number: 310799  Size: SH
  15. Remove the hood hinge bolts (1) from the service position (2) and position the hood in the normal position.
  16. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).

  17. Raise the vehicle.

  18. Object Number: 702776  Size: SH
  19. If equipped with an automatic transmission, position the transmission fluid fill tube to the studs.
  20. Install the transmission fluid fill tube to bellhousing nuts.
  21. Tighten
    Tighten the nuts to 18 N·m (13 lb ft).


    Object Number: 694896  Size: SH
  22. Install the exhaust manifold pipe.
  23. Slide the exhaust manifold pipe hanger into the insulator.

  24. Object Number: 694338  Size: SH
  25. Install the exhaust muffler nuts until snug.

  26. Object Number: 668379  Size: SH
  27. Slide the exhaust pipe clamp down onto the exhaust pipe.
  28. Tighten the exhaust manifold pipe clamp.
  29. Tighten

        • Tighten the clamp to 15 N·m (11 lb ft).
        • Tighten the nuts to 40 N·m (30 lb ft).
  30. Lower the vehicle.