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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1353 (Engine Mechanical - 4.3L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Cylinder Head Replacement - Right >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Assemble the cylinder head, if necessary. Refer to Cylinder Head Assemble .
  2. Install the cylinder head locator pins, if necessary.
    Fig 1: Cylinder Head Locator Pins
    G02105913Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not use any type of sealer on the cylinder head gasket.
  3. Install a NEW cylinder head gasket.
    Fig 2: Cylinder Head Gasket
    G02105914Courtesy of GENERAL MOTORS CORP.
  4. Install the cylinder head.
    Fig 3: Cylinder Head
    G02105915Courtesy of GENERAL MOTORS CORP.
  5. Apply sealant GM P/N 12346004, (Canadian P/N 109534480), or equivalent to the threads of the cylinder head bolts.
    NOTE: Refer to FASTENER NOTICE .
  6. Install the cylinder head bolts until snug.
    Fig 4: Cylinder Head Bolts
    G02105916Courtesy of GENERAL MOTORS CORP.
  7. Tighten the cylinder head bolts using the sequence shown.

    Tighten 

    • Tighten the bolts a first pass to 30 N.m (22 lb ft).
    • Tighten the long bolts (1, 4, 5, 8, 9) a final pass to 75 degrees using the J 36660-A  .
    • Tighten the medium bolts (12, 13) a final pass to 65 degrees using the J 36660-A  .
    • Tighten the short bolts (2, 3, 6, 7, 10, 11) a final pass to 55 degrees using the J 36660-A  .
    Fig 5: Tightening Sequence For Cylinder Head Bolts
    G02105917Courtesy of GENERAL MOTORS CORP.
  8. Install the spark plug wire support and bolts.

    Tighten 

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

    Fig 6: Spark Plug Wire Support & Bolts
    G02105918Courtesy of GENERAL MOTORS CORP.
  9. Install the spark plugs.
  10. If installing NEW spark plugs measure for the correct gap. Adjust the spark plug gap if necessary.

    Specification 

    Spark plug gap to 1.52 mm (0.060 in).

    Tighten 

    • Tighten the plugs on 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).
    Fig 7: Spark Plug
    G02105919Courtesy of GENERAL MOTORS CORP.
  11. Install the generator bracket stud.

    Tighten 

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

  12. Install the right pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
  13. Install the exhaust manifold. Refer to EXHAUST MANIFOLD REPLACEMENT - RIGHT (4.3L ENGINE) .
  14. Install the intake manifold. Refer to Intake Manifold Replacement - Lower .
  15. Install the generator bracket.
    Fig 8: Generator Bracket Stud
    G02105920Courtesy of GENERAL MOTORS CORP.
  16. Fill the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
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