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Home >> Hummer >> 2003 >> H2 >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust >> Repair Instructions >> Exhaust Manifold Replacement - Right >> Installation Procedure

Installation Procedure

    Fig 1: Heat Shield Bolts, Heat Shield & Exhaust Manifold
    GM492768Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE .
  1. Install the heat shield (2), and bolts (1) to the exhaust manifold (1), if necessary.

    Tighten:  Tighten the bolts to 9 N.m (80 lb in).

    2. Fig 2: Exhaust Manifold Bolts, Manifold & Manifold Gasket (Right)
    GM260093Courtesy of GENERAL MOTORS CORP.
    IMPORTANT:
    • Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.
    • The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material.
    • Do not apply sealant to the first three threads of the bolt.
  2. Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the threads of the exhaust manifold bolts.
  3. Install the NEW manifold gasket, exhaust manifold, and bolts.

    Tighten: 

    1. Tighten the exhaust manifold bolts a first pass to 15 N.m (11 lb ft). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside bolts.
    2. Tighten the exhaust manifold bolts a final pass to 25 N.m (18 lb ft). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside bolts.

  4. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the front of the right cylinder head.
  5. Install the oil level indicator tube. Refer to OIL LEVEL INDICATOR AND TUBE REMOVAL .
  6. Install the spark plug wires.
  7. Install the inlet heater hose. Refer to HEATER HOSE REPLACEMENT - INLET .
  8. Install the outlet heater hose. Refer to HEATER HOSE REPLACEMENT - OUTLET .
  9. Install the air cleaner assembly.
  10. Raise the vehicle.
    11. Fig 3: Exhaust Manifold Pipe Nuts (Right)
    GM664837Courtesy of GENERAL MOTORS CORP.
  11. Install the exhaust manifold pipe nuts.

    Tighten:  Tighten the nuts to 50 N.m (37 lb ft).

  12. Lower the vehicle.
  13. Fill the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
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