GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Engine 🢒 Engine Mechanical - 6.6L (LB7) 🢒 Turbocharger Installation

    Object Number: 798882 Size: SH

    Notice: Do not twist the turbocharger oil feed pipe. Twisting of the feed pipe will result in the collapse and deformation of the plastic pipe, restricting oil flow and causing turbocharger damage. During turbocharger replacement, gently push the oil feed pipe towards the front of the engine to clear the turbocharger. Assistance may be required to keep the pipes clear of the turbocharger during removal or installation.

  1. Install the turbocharger oil supply line to the engine block.

    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 turbocharger oil supply line eye bolt and washers.

    3. Lubricate the washers with diesel fuel before installing.

    Tighten
    Tighten the turbocharger oil supply line eye bolt to 34 N·m (25 lb ft).

  3. Install the turbocharger lower heat shield to the engine block.

    4. Object Number: 798881 Size: SH
  4. Install the turbocharger assembly with the oil return pipe.
  5. Install the turbocharger mounting bolts.

    6. Tighten
    Tighten the turbocharger mounting bolts to 108 N·m (80 lb ft).


    Object Number: 668428 Size: SH
  6. Install the turbocharger cooling outlet hose and tighten hose clamp.

    7. Object Number: 660383 Size: SH

    Notice: Do not twist the turbocharger oil feed pipe. Twisting of the feed pipe will result in the collapse and deformation of the plastic pipe, restricting oil flow and causing turbocharger damage. During turbocharger replacement, gently push the oil feed pipe towards the front of the engine to clear the turbocharger. Assistance may be required to keep the pipes clear of the turbocharger during removal or installation.

  7. Install the oil supply line eye bolt and washers to the turbocharger.

    8. Lubricate the washers with diesel fuel before installing.

    Tighten
    Tighten the oil supply hose eye bolt to 34 N·m (25 lb ft).


    Object Number: 660382 Size: SH
  8. Install the turbocharger heat shield.
  9. Install the turbocharger upper heat shield bolts.

    10. Tighten
    Tighten the turbocharger upper heat shield bolts to 9 N·m (80 lb in).