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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1500 (Engine Exhaust System) >> Repair Instructions >> Exhaust Manifold Replacement (4.2L Engine) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install a new exhaust manifold gasket.
    Fig 1: Installing New Exhaust Manifold Gasket
    G02131289Courtesy of GENERAL MOTORS CORP.
  2. Install the exhaust manifold.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  3. With threadlock GM P/N 12345493 (Canadian P/N 10953488) on the manifold bolts, install the bolts onto the manifold.

    Tighten 

    1. 3.1. Tighten the exhaust manifold bolts first pass in sequence to 20 N.m (15 lb ft).
    2. 3.2. Tighten the exhaust manifold bolts second pass in sequence to 20 N.m (15 lb ft).
    3. 3.3. Tighten the exhaust manifold bolts final pass in sequence to 20 N.m (15 lb ft).
      Fig 2: Installing Exhaust Manifold Bolts In Sequence
      G02131290Courtesy of GENERAL MOTORS CORP.
  4. Install the exhaust manifold heat shield studs, if required.

    Tighten 

    Tighten the heat shield studs to 10 N.m (89 lb in).

  5. Install the oxygen sensor. Refer to OXYGEN SENSORS (4.2L) .
    Fig 3: Installing Exhaust Manifold Heat Shield Studs
    G02131291Courtesy of GENERAL MOTORS CORP.
  6. Install the exhaust manifold heat shield.
  7. Add anti-seize compound GM P/N 12371386 to the exhaust manifold heat shield nuts.
  8. Install the exhaust manifold heat shield nuts.

    Tighten 

    Tighten the exhaust manifold heat shield nuts to 5 N.m (44 lb in).

  9. Raise the vehicle.
    Fig 4: Installing Exhaust Manifold Heat Shield & Nuts
    G02131292Courtesy of GENERAL MOTORS CORP.
  10. Install the exhaust pipe to the manifold with seal and secure the pipe with the nuts.

    Tighten 

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

  11. Lower the vehicle.
  12. Install the oil level indicator tube. Refer to OIL LEVEL INDICATOR AND TUBE REPLACEMENT  .
    Fig 5: Installing Exhaust Pipe To Manifold With Seal
    G02131293Courtesy of GENERAL MOTORS CORP.
  13. Move the transmission filler tube back onto the A.I.R. adapter block stud and secure the tube with the nut.

    Tighten 

    Tighten the transmission filler tube bracket nut to 10 N.m (89 lb in).

  14. Install the air cleaner resonator outlet duct. Refer to AIR CLEANER RESONATOR OUTLET DUCT .
    Fig 6: Installing Transmission Filler Tube Bracket Nut
    G02131294Courtesy of GENERAL MOTORS CORP.
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