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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 421 (Engine Mechanical - 4.8L, 5.3L, & 6.0L (On-Vehicle)) >> Repair Instructions >> Cylinder Head Replacement - Right >> 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.
    Fig 1: Identifying Cylinder Head Locating Pins Installation Position
    GM63235Courtesy 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.

  2. Use spray cleaner GM U.S. P/N 12346139, P/N 12377981, Canada 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.
    5. IMPORTANT: When properly installed, the tab on the right cylinder head gasket will be located right of center or closer to the front of the engine.
    Fig 2: View Of Right Cylinder Head Gasket And Alignment Pins
    GM63170Courtesy of GENERAL MOTORS CORP.
  5. Install the NEW right cylinder head gasket onto the locating pins.
    6. Fig 3: View Of Cylinder Head & Bolts
    GM260149Courtesy of GENERAL MOTORS CORP.
  6. Install the cylinder head onto the locating pins and gasket.
  7. Install the NEW cylinder head bolts.
    8. Fig 4: Cylinder Head Bolt Tightening Sequence
    GM260150Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  8. Tighten the cylinder head bolts.

    Tighten: 

    1. Tighten the M11 cylinder head bolts a first pass in sequence to 30 N.m (22 lb ft).
    2. Tighten the M11 cylinder head bolts a second pass in sequence to 90 degrees using J 36660-A  .
    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. 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.

    9. Fig 5: Left Gasket Locating Tab
    GM384697Courtesy of GENERAL MOTORS CORP.
  9. The cylinder head gasket displacement can be verified by markings visible on the top side of the left gasket locating tab.
    • Some 4.8/5.3 L head gaskets may have 53 stamped onto the locating tab.
    • Some 6.0 L head gaskets may have 60 stamped onto the locating tab.
  10. Install the pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
  11. Install the right exhaust manifold. Refer to EXHAUST MANIFOLD REPLACEMENT - RIGHT (4.8L, 5.3L, AND 6.0L ENGINES) or EXHAUST MANIFOLD REPLACEMENT - RIGHT (8.1L ENGINE) in Engine Exhaust.
  12. Install the coolant air bleed pipe. Refer to COOLANT AIR BLEED PIPE ASSEMBLY REPLACEMENT (4.8L, 5.3L, AND 6.0L ENGINES) in Engine Cooling.
  13. Install the intake manifold. Refer to Intake Manifold Replacement .
  14. Install the oil level indicator. Refer to Oil Level Indicator and Tube Replacement .
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