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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 126 (Engine Mechanical - 4.8L, 5.3L, 6.0L And 6.2L (2 Of 5)) >> On-Vehicle Repair Instructions (1 Of 2) >> Cylinder Head Replacement - Left Side >> Installation Procedure

Installation Procedure

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CAUTION: Wear safety glasses in order to avoid eye damage.
NOTE: Clean all dirt, debris, and coolant from the engine block cylinder head bolt holes. Failure to remove all foreign material may result in damaged threads, improperly tightened fasteners or damage to components.
IMPORTANT:
  • Do not reuse the cylinder head bolts. Install NEW cylinder head bolts during assembly.
  • Do not use any type of sealant on the cylinder head gasket (unless specified).
    Fig 1: Checking Cylinder Head Bolt Holes
    GM832969Courtesy of GENERAL MOTORS CORP.
  1. Clean the engine block cylinder head bolt holes, if required. Thread repair tool J 42385-107, found in J 42385-200  may be used to clean the threads of old threadlocking material. See Special Tools .
  2. Spray cleaner GM P/N 12346139, P/N 12377981 (Canadian P/N 10953463), or equivalent into the hole.
  3. Clean the cylinder head bolt holes with compressed air.
  4. Check the cylinder head locating pins for proper installation (a) 8.3 mm (0.327 in).
    5. Fig 2: View Of Cylinder Head Gasket & Locating Pins
    GM1658153Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: When properly installed, with FRONT on the left side, the tab on the cylinder head gasket should be located left of center.
  5. Install the NEW cylinder head gasket (217) onto the locating pins.
    6. Fig 3: View Of Cylinder Head & Bolts
    GM1658150Courtesy of GENERAL MOTORS CORP.
  6. Install the cylinder head (218) onto the locating pins.
  7. Install the NEW cylinder head bolts (220, 221).
    8. Fig 4: Tightening Sequence For Cylinder Head Bolts
    GM832971Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  8. Tighten the cylinder head bolts.

    Tighten: 

    1. Tighten the M11 cylinder head bolts (1-10) a first pass in sequence to 30 N.m (22 lb ft).
    2. Tighten the M11 cylinder head bolts (1-10) a second pass in sequence to 90 degrees using J 45059  . See Special Tools .
    3. Tighten the M11 cylinder head bolts (1-10) a final pass to 70 degrees using J 45059  . See Special Tools .
    4. Tighten the M8 cylinder head bolts (11-15) to 30 N.m (22 lb ft). Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.

    9. Fig 5: View Of Engine Ground Strap & Bolt
    GM1699550Courtesy of GENERAL MOTORS CORP.
  9. Position the ground strap to the rear of the left cylinder head.
  10. Install the engine ground strap bolt to the rear of the left cylinder head.

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

  11. Install the pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
  12. Install the left exhaust manifold. Refer to Exhaust Manifold Replacement - Left Side .
  13. Install the coolant air bleed pipe. Refer to Coolant Air Bleed Pipe Assembly Replacement (RPOs LC9/LY5/LMG/L76/L92) or Coolant Air Bleed Pipe Assembly Replacement (RPOs LY2/LY6) .
  14. Install the intake manifold. Refer to Intake Manifold Replacement (RPOs LC9/LMG/LY5/L76/L92)  or Intake Manifold Replacement (RPOs LY2/LY6) .
  15. Install the generator bracket. Refer to Generator Replacement .
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