GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Express - AWD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Camshaft Replacement

Removal Procedure
  1. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. Remove the engine cover. Refer to Engine Cover Replacement .
  3. Remove the radiator. Refer to Radiator Replacement .
  4. Remove the A/C condenser. Refer to Condenser Replacement .
  5. Remove the engine cooling fan. Refer to Fan Replacement .
  6. Remove the valve lifters. Refer to Valve Lifter Replacement .

    7. Object Number: 9847 Size: SH
  7. Remove the timing chain and the camshaft sprocket. Refer to Camshaft Timing Chain, Sprocket, and Tensioner Replacement .
  8. Remove the balance shaft drive gear.

    9. Object Number: 188030 Size: SH
  9. Remove the camshaft retainer bolts and retainer.

    10. Object Number: 5147 Size: SH
  10. Remove the engine camshaft.
    11. 10.1. Install the three 5/16-18 x 4.0 inch bolts into the engine camshaft front bolt holes.
    10.2. Using the bolts as a handle, carefully rotate and pull the engine camshaft out of the camshaft bearings.
    10.3. Remove the bolts from the front of the engine camshaft.
  11. Clean and inspect the camshaft and the bearings. Refer to Camshaft and Bearings Cleaning and Inspection .

Installation Procedure

    Object Number: 5147 Size: SH

    Important: Whenever a new camshaft is installed, do the following procedures:

       • Change the engine oil.
       • Change the engine oil filter.
       • Add GM Engine Oil Supplement to the engine oil. Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number.

  1. Apply clean engine oil, or engine oil supplement or equivalent to the following components:
    2. • The engine camshaft lobes
    • The camshaft bearing journals
    • The camshaft bearings
  2. Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number.
  3. Install three 5/16-18 x 4.0 inch bolts into the engine camshaft front bolt holes.
  4. Use the bolts as a handle in order to install the engine camshaft.
  5. Remove the 3 bolts from the front of the engine camshaft.

    6. Object Number: 188030 Size: SH
  6. If reusing the fasteners, apply threadlock to the threads of the camshaft retainer bolts. Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number.

    7. Notice: Refer to Fastener Notice in the Preface section.

  7. Install the camshaft retainer and bolts.

    8. Tighten
    Tighten the camshaft retainer bolts to 12 N·m (106 lb in).

  8. Install the balance shaft drive gear. Refer to Balance Shaft Replacement for alignment of the balance shaft drive gear and the driven gear.
  9. Install the timing chain and camshaft sprocket. Refer to Camshaft Timing Chain, Sprocket, and Tensioner Replacement .
  10. Install the valve lifters. Refer to Valve Lifter Replacement .
  11. Install the A/C condenser. Refer to Condenser Replacement .
  12. Install the engine cooling fan. Refer to Fan Replacement .
  13. Install the radiator. Refer to Radiator Replacement .
  14. Fill the engine cooling system. Refer to Cooling System Draining and Filling .
  15. Recharge the air conditioning system. Refer to Refrigerant Recovery and Recharging .
  16. Install the engine cover. Refer to Engine Cover Replacement .
  17. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .