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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 639 (Engine Exhaust System) >> Repair Instructions >> Exhaust Manifold Replacement - Right (L47) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the heated oxygen sensor at the sensor pigtail.
    CAUTION: The wheels of the vehicle must be straight ahead and the steering column in the LOCK position before disconnecting the steering column or intermediate shaft from the steering gear. Failure to do so will cause the coil assembly in the steering column to become uncentered which will cause damage to the coil assembly.
  2. Lock the steering column by installing the J 42640  into the underside of the steering column.
    3. Fig 1: Locking Steering Column
    G01818198Courtesy of GENERAL MOTORS CORP.
  3. Raise and support the vehicle.
  4. Remove the rear exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement - Rear (L47) .
  5. Remove the two nuts (2) attaching the secondary AIR tube (1) to the exhaust manifold (3).
  6. Remove the secondary AIR tube (1) and the gasket from the exhaust manifold (3). Do not reuse the gasket.
    Fig 2: Removing Secondary AIR Tube & Gasket
    G01818199Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the post heated oxygen sensor wiring harness retainer from the power steering gear heat shield.
  8. Remove the two bolts securing the heat shield.
  9. Remove the heat shield from the power steering gear.
    Fig 3: Removing Power Steering Gear Heat Shield
    G01818200Courtesy of GENERAL MOTORS CORP.
  10. Remove the rearward nut (3) securing the vehicle speed sensor heat shield (1).
  11. Loosen the forward nut (2) in order to remove the heat shield (1).
  12. Remove the heat shield (1) from the transaxle.
    Fig 4: Removing Vehicle Speed Sensor Heatshield
    G01818201Courtesy of GENERAL MOTORS CORP.
    CAUTION: Failure to disconnect the intermediate shaft from the rack and pinion stub shaft can result in damage to the steering gear and/or damage to the intermediate shaft. This damage may cause loss of steering control which could result in personal injury.
  13. Remove the intermediate shaft pinch bolt.
  14. Disconnect the intermediate shaft from the steering gear.
    Fig 5: Disconnecting Intermediate Shaft From Steering Gear
    G01818202Courtesy of GENERAL MOTORS CORP.
  15. Remove the nut securing the right engine mount to the right engine mount bracket.
    Fig 6: Removing Right Engine Mount Bracket Nut
    G01818203Courtesy of GENERAL MOTORS CORP.
  16. Remove the nut securing the left transaxle mount to the left transaxle mount bracket.
    Fig 7: Removing Left Transaxle Mount Bracket Nut
    G01818204Courtesy of GENERAL MOTORS CORP.
  17. Support the rear of the engine frame with a tall screw jack.
  18. Remove the four rearward engine frame-to-body bolts.
  19. Lower the screw jack approximately 4 cm (1.5 in) allowing the rear of the engine frame to lower.
    20. Fig 8: Supporting Rear Engine Frame W/Screw Jack
    G01818205Courtesy of GENERAL MOTORS CORP.
  20. Remove the heated oxygen sensor if replacement is necessary. Refer to UPSTREAM HEATED OXYGEN SENSOR .
  21. Remove the right exhaust manifold retaining nuts.
  22. Remove the right exhaust manifold and the gasket from the engine. Do not reuse the gasket.
    23. Fig 9: Removing Right Exhaust Manifold & Gasket
    G01818206Courtesy of GENERAL MOTORS CORP.
  23. Clean and inspect the right exhaust manifold. Refer to EXHAUST MANIFOLD CLEANING AND INSPECTION - RIGHT .
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