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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 144 (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 Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clean the cylinder head gasket surfaces on the engine block.
  2. Inspect the dowel pins (cylinder head locator) for proper installation.
  3. Clean the cylinder head gasket surfaces on the cylinder head.
    Fig 1: Inspecting Dowel Pins For Proper Installation
    G02077810Courtesy of GENERAL MOTORS CORP.

    Important:  Do not use any type sealer on the cylinder head gasket, unless specified.

  4. Install the NEW cylinder head gasket in position over the dowel pins cylinder head locator.
    Fig 2: Installing Cylinder Head Gasket
    G02077811Courtesy of GENERAL MOTORS CORP.
  5. Install the cylinder head onto the engine block.

    Guide the cylinder head carefully into place over the dowel pins and the cylinder head gasket.

    Fig 3: Installing Cylinder Head
    G02077812Courtesy of GENERAL MOTORS CORP.
  6. Apply sealant GM P/N 12346004 (Canadian P/N 12346004) or equivalent to the threads of the cylinder head bolts.
  7. Install the cylinder head bolts finger tight.
    Fig 4: Installing Cylinder Head Bolts
    G02077813Courtesy of GENERAL MOTORS CORP.
    CAUTION: 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.
  8. Tighten the cylinder head bolts in sequence on the first pass.

    Tighten 

    Tighten the bolts in sequence on the first pass to 30 N.m (22 lb ft).

  9. Use the in order to tighten the cylinder head bolts in sequence on the final pass.

    Tighten 

    • Tighten the long bolts (1, 4, 5, 8, and 9) on the final pass in sequence to 75 degrees.
    • Tighten the medium bolts (12 and 13) on the final pass in sequence to 65 degrees.
    • Tighten the short bolts (2, 3, 6, 7, 10, and 11) on the final pass in sequence to 55 degrees.
      Fig 5: Tightening Cylinder Head Bolts In Sequence
      G02077814Courtesy of GENERAL MOTORS CORP.
  10. Install the spark plug wire support and bolts.

    Tighten 

    Tighten only the rear spark plug wire support bolt to 12 N.m (106 lb in).

  11. Remove the front spark plug wire support bolt.

    The front spark plug wire support bolt is used to fasten the oil level indicator tube, and will be installed within the oil level indicator tube installation procedure.

    Fig 6: Installing Spark Plug Wire Support & Bolts
    G02077815Courtesy of GENERAL MOTORS CORP.
  12. Measure the NEW spark plugs for the proper gap. Adjust the spark plug gap if necessary.

    Specification 

    Spark plug gap to 1.52 mm (0.060 in).

  13. Install the spark plugs.

    Tighten 

    • Tighten the spark plugs for a USED cylinder head to 15 N.m (11 lb ft).
    • Tighten the spark plugs for the initial installation of a NEW cylinder head to 30 N.m (22 lb ft).
  14. Install the valve pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
    Fig 7: Installing Spark Plugs
    G02077816Courtesy of GENERAL MOTORS CORP.
  15. Install the ground wires and nut at the rear of the cylinder head.

    Tighten 

    Tighten the ground wire nut to 10 N.m (88 lb in).

  16. Install the exhaust manifold. Refer to EXHAUST MANIFOLD REPLACEMENT-RIGHT (4.3L) or EXHAUST MANIFOLD REPLACEMENT - RIGHT (4.8L, 5.3L, 6.0L) .
  17. Install the intake manifold. Refer to Intake Manifold Replacement - Lower .
    Fig 8: Installing Ground Wires & Nuts At Rear Of Cylinder Head
    G02077817Courtesy of GENERAL MOTORS CORP.
  18. Install the stud for the generator mounting bracket to the cylinder head.

    Tighten 

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

    Fig 9: Installing Generator Mounting Bracket Stud
    G02077818Courtesy of GENERAL MOTORS CORP.
  19. Install the generator mounting bracket. Refer to Generator Bracket Replacement (4.3L Engine)  or GENERATOR BRACKET REPLACEMENT (4.8L, 5.3L, AND 6.0L ENGINES) .
  20. Install the fan shroud. Refer to FAN SHROUD REPLACEMENT .
  21. Fill the engine coolant system. Refer to DRAINING AND FILLING COOLING SYSTEM .
  22. Connect the battery negative cable. Refer to Battery Negative Cable Disconnect/Connect Procedure .
  23. Install the engine cover. Refer to Engine Cover Replacement in Interior Trim .
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