GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Chevy C Silverado - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Cylinder Head Replacement - Left Side

Special Tools

J 36660-A Torque Angle Meter

Removal Procedure

    Object Number: 782670 Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Remove the drive belt. Refer to Drive Belt Replacement .
  3. Remove the lower intake manifold. Refer to Lower Intake Manifold Replacement .
  4. Remove the left exhaust manifold. Refer to Exhaust Manifold Replacement - Left Side .
  5. Remove the left side pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
  6. Remove the junction block bracket bolt.
  7. Position the bracket and wiring harness aside.

    8. Object Number: 340090 Size: SH
  8. Loosen the power steering (P/S) pump rear bracket nut.
  9. Remove the P/S pump rear bracket front nut.
  10. Remove the bolts and nut for the P/S pump bracket.
  11. Leave the air conditioning (A/C) compressor, if equipped, and the P/S pump on the bracket.
  12. Slide the P/S pump bracket off of the stud and set aside.

    13. Object Number: 475833 Size: SH
  13. Remove the P/S pump bracket stud.

    14. Object Number: 782680 Size: SH
  14. Remove the harness ground bolt.
  15. Position the harness ground (4) and ground strap (5).

    16. Object Number: 387769 Size: SH
  16. Remove the engine coolant temperature (ECT) sensor.

    17. Object Number: 328582 Size: SH
  17. Remove the spark plugs.

    18. Object Number: 328588 Size: SH
  18. Remove the spark plug wire support bolts and support.

    19. Object Number: 480533 Size: SH
  19. Remove and discard the cylinder head bolts.

    20. Object Number: 480536 Size: SH
  20. Remove the cylinder head.

    21. Object Number: 334299 Size: SH
  21. Remove and discard the cylinder head gasket.

    22. Object Number: 330548 Size: SH
  22. Remove the cylinder head locator pins, if necessary.
  23. Clean and inspect the cylinder head, if necessary. Refer to Cylinder Head Cleaning and Inspection .
  24. Disassemble the cylinder head, if necessary. Refer to Cylinder Head Disassemble .

Installation Procedure

    Object Number: 334303 Size: SH
  1. Assemble the cylinder head, if necessary. Refer to Cylinder Head Assemble .
  2. Install the cylinder head locator pins, if necessary.

    3. Object Number: 334299 Size: SH

    Important: Do not use any type of sealer on the cylinder head gasket.

  3. Install a NEW cylinder head gasket.

    4. Object Number: 480536 Size: SH
  4. Install the cylinder head.

    5. Object Number: 480533 Size: SH
  5. Apply sealant GM P/N 12346004, (Canadian P/N 109534480), or equivalent to the threads of the NEW cylinder head bolts.
  6. Install the cylinder head bolts finger tight.

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


    Object Number: 5132 Size: SH
  7. Tighten the cylinder head bolts using the sequence shown.

    8. Tighten

    1. Tighten the bolts a first pass to 30 N·m (22 lb ft).
    2. Tighten the long bolts (1, 4, 5, 8, 9) a final pass to 75 degrees using the J 36660-A .
    3. Tighten the medium bolts (12, 13) a final pass to 65 degrees using the J 36660-A .
    4. Tighten the short bolts (2, 3, 6, 7, 10, 11) a final pass to 55 degrees using the J 36660-A .

    Object Number: 328588 Size: SH
  8. Install the spark plug wire support and bolts.

    9. Tighten
    Tighten the bolts to 12 N·m (106 lb in).


    Object Number: 328582 Size: SH
  9. Install the spark plugs.
  10. If installing NEW spark plugs measure for the correct gap. Adjust the spark plug gap if necessary.

    11. Specification
    Spark plug gap to 1.52 mm (0.060 in).

    Tighten

        • Tighten the plugs in a USED cylinder head to 15 N·m (11 lb ft).
        • Tighten the plugs on the initial installation of a NEW cylinder head to 30 N·m (22 lb ft).

    Object Number: 387769 Size: SH
  11. Install the ECT sensor. If reusing the old sensor, apply sealant GM P/N 12346004 (Canadian P/N 109534480), or equivalent to the threads.

    12. Tighten
    Tighten the sensor to 20 N·m (15 lb ft).


    Object Number: 782680 Size: SH
  12. Position the ground strap (5) and harness ground (4).
  13. Install the harness ground bolt.

    14. Tighten
    Tighten the bolt to 16 N·m (12 lb ft).


    Object Number: 475833 Size: SH
  14. Install the P/S pump bracket stud.

    15. Tighten
    Tighten the stud to 20 N·m (15 lb ft).


    Object Number: 340090 Size: SH
  15. Slide the P/S pump bracket rearward.
  16. Install the bolts and nuts for the P/S pump bracket.
  17. Install the P/S pump rear bracket front nut.
  18. Tighten the P/S pump rear bracket nut.

    19. Tighten
    Tighten the bolts and nuts to 41 N·m (30 lb ft).


    Object Number: 782670 Size: SH
  19. Position the bracket and wiring harness.
  20. Install the junction block bracket bolt.

    21. Tighten
    Tighten the bolt to 25 N·m (18 lb ft).

  21. Install the left side pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
  22. Install the left exhaust manifold. Refer to Exhaust Manifold Replacement - Left Side .
  23. Install the lower intake manifold. Refer to Lower Intake Manifold Replacement .
  24. Install the drive belt. Refer to Drive Belt Replacement .
  25. Fill the cooling system. Refer to Cooling System Draining and Filling .