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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1354 (Engine Mechanical - 4.8L, 5.3L & 6.0L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Cylinder Head Replacement - Left >> 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).
  • The cylinder head gaskets must be installed in the proper direction and position.
  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.

  2. Use 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, location (a) 8.3 mm (0.327 in).
    5. Fig 1: Cylinder Head Locating Pins Installation Position
    G02106686Courtesy of GENERAL MOTORS CORP.
  5. When properly installed, with FRONT on the left side, the tab on the cylinder head gasket should be located left of center or closer to the front of the engine.
    Fig 2: Identifying Cylinder Head Gasket Tab Position
    G02106687Courtesy of GENERAL MOTORS CORP.
  6. Install the NEW cylinder head gasket.
    Fig 3: Installing Cylinder Head Gasket
    G02106688Courtesy of GENERAL MOTORS CORP.
  7. Install the cylinder heads.
    Fig 4: Installing Cylinder Head
    G02106689Courtesy of GENERAL MOTORS CORP.
  8. Install NEW cylinder head bolts (1, 2, 3).
    Fig 5: Installing Cylinder Head Bolts
    G02106690Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE .
  9. Tighten the cylinder head bolts.

    Tighten 

    1. 9.1. Tighten the M11 cylinder head bolts a first pass in sequence to 30 N.m (22 lb ft).
    2. 9.2. Tighten the M11 cylinder head bolts a second pass in sequence to 90 degrees using J 36660-A  .
    3. 9.3. Tighten the M11 cylinder head bolts (1, 2, 3, 4, 5, 6, 7, 8) to 90 degrees and the M11 cylinder head bolts (9 and 10) to 50 degrees a final pass in sequence using J 36660-A  .
    4. 9.4. Tighten the M8 cylinder head bolts (11, 12, 13, 14, 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.
    Fig 6: Tightening Sequence For Cylinder Head Bolts
    G02106691Courtesy of GENERAL MOTORS CORP.
  10. Install the pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
  11. Install the left exhaust manifold. Refer to EXHAUST MANIFOLD REPLACEMENT - LEFT (4.8L, 5.3L, AND 6.0L ENGINE)
  12. Install the coolant air bleed pipe. Refer to COOLANT AIR BLEED PIPE ASSEMBLY REPLACEMENT (4.8L, 5.3L, and 6.0L Engines) .
  13. Install the generator bracket. Refer to GENERATOR (4.8L, 5.3L & 6.0L ENGINES) .
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