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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1021 (Engine Mechanical - 8.1L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Cylinder Head Replacement - Left >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Make sure the threaded holes in the engine block are clean and not damaged. Do not use sealer on any engines that use a composition type gasket. Align the cylinder head gasket locating marks to face up. Ensure that the head gasket tabs are located over the numbers 1 and 2 cylinders for correct installation.
  1. Place a NEW cylinder head gasket into position.
    2. Fig 1: View Of Left Cylinder Head Gasket And Alignment Pins
    GM470974Courtesy of GENERAL MOTORS CORP.
  2. Install the cylinder head.
    3. Fig 2: View Of Left Cylinder Head And Alignment Pin
    GM470916Courtesy of GENERAL MOTORS CORP.
    NOTE: Do not reuse the cylinder head bolts. NEW cylinder head bolts must be used. The cylinder head bolts are torque-to-yield bolts and cannot be reused once the initial torque is applied. During the initial torque of the cylinder head bolt the cylinder head bolt is stretched to achieve proper clamp load. Proper clamp load will not be achieved if a used cylinder head bolt is torqued again. A stretched cylinder head bolt can also break when torqued. Failure to replace the used cylinder head bolts with NEW cylinder head bolts can lead to improper clamp loads and extensive engine damage.
    IMPORTANT: The sealer must be applied to a minimum of eight threads starting at the point of the cylinder head bolt.
  3. If not pre-applied to the NEW cylinder head bolts, apply sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the cylinder head bolts.
  4. Install the cylinder head bolts (1, 2, and 3).
    5. Fig 3: View Of Left Cylinder Head Bolts
    GM470914Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
    IMPORTANT: The long bolts are used in locations 1, 2, 3, 6, 7, 8, 9, 10, 11, 14, 16, and 17. The medium length bolts are used in locations 15 and 18. The short bolts are used in locations 4, 5, 12, and 13.
  5. Tighten the cylinder head bolts.

    Tighten: 

    1. Tighten the bolts a first pass in sequence to 30 N.m (22 lb ft)
    2. Tighten the bolts a second pass in sequence to 30 N.m (22 lb ft) then an additional 120 degrees using J 45059  .
    3. Tighten the bolts (1, 2, 3, 6, 7, 8, 9, 10, 11, 14, 16, 17) an additional 60 degrees, bolts (15, and 18) an additional 45 degrees, and bolts (4, 5, 12, and 13) an additional 30 degrees a final pass in sequence using J 45059  .

    6. Fig 4: Cylinder Head Bolt Tightening Sequence
    GM470987Courtesy of GENERAL MOTORS CORP.
  6. Install the exhaust manifold. Refer to Exhaust Manifold Replacement - Left (8.1L Engine) in Engine Exhaust.
  7. Install the water crossover. Refer to Coolant Crossover Pipe Replacement (8.1L) in Engine Cooling.
  8. Position the engine harness grounds (1 and 5) and ground strap (4) to the cylinder head.
    9. Fig 5: View Of Engine Harness Grounds And CKP Sensor And Oil Pressure Sensor Electrical Connectors
    GM1235690Courtesy of GENERAL MOTORS CORP.
  9. Install the engine harness ground bolts.

    Tighten:  Tighten the bolts to 16 N.m (12 lb ft).

  10. Install the valve rocker arms and pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
  11. Install the intake manifold. Refer to Intake Manifold Replacement .
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