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For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 Allure 🢒 Preface 🢒 Cautions and Notices 🢒 Exhaust Manifold Replacement - Right Side

Exhaust Manifold Replacement - Right Side RPOs L26/L32

Removal Procedure

    Object Number: 910984 Size: SH
  1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical - 3.8L.
  2. Remove the exhaust crossover heat shield nuts (1).
  3. Remove the exhaust crossover heat shield (2).

    4. Object Number: 911162 Size: SH
  4. Remove the exhaust crossover pipe studs (3) from the right exhaust manifold.
  5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    6. Object Number: 911163 Size: SH
  6. Remove the exhaust manifold pipe stud nuts (2) and the catalytic converter pipe (3) from the right exhaust manifold.
  7. Lower the vehicle.
  8. Rotate the engine to access the right side of the engine. Refer to Rotating the Engine for Service Access in Engine Mechanical - 3.8L.

    9. Object Number: 911055 Size: SH
  9. Disconnect the heated oxygen sensor (HO2S) electrical connector (1).
  10. Remove the HO2S electrical connector (1) from the engine sight shield bracket.
  11. Remove the HO2S (2) from the right exhaust manifold. Refer to Heated Oxygen Sensor 1 Replacement
  12. Remove the right side spark plugs from cylinders 2, 4 and 6. Refer to Spark Plug Replacement in Engine Controls - 3.8L.

    13. Object Number: 911011 Size: SH
  13. Remove the fuel injector sight shield bracket nuts (2).
  14. Remove the fuel injector sight shield bracket (1).

    15. Object Number: 910986 Size: SH
  15. Remove the right engine lift bracket bolt (2) and the nut (3).
  16. Remove the right engine lift bracket (1).

    17. Object Number: 911016 Size: SH
  17. Remove the right exhaust manifold heat shield bolts (2).
  18. Remove the right exhaust manifold heat shield (1).
  19. Raise the vehicle.

    20. Object Number: 911025 Size: SH
  20. Remove the exhaust gas recirculation (EGR) valve inlet adapter pipe bolt (1) from the right exhaust manifold.
  21. Lower the vehicle.

    22. Object Number: 910980 Size: SH
  22. Remove the right exhaust manifold studs (4) and the nuts (3).
  23. Remove the right exhaust manifold (2).
  24. Remove the right exhaust manifold gasket (1).

    25. Object Number: 305693 Size: SH
  25. Remove the exhaust manifold studs if damaged.
  26. Clean and Inspect the right exhaust manifold. Refer to Exhaust Manifold Cleaning and Inspection in Engine Mechanical - 3.8L.

Installation Procedure

    Object Number: 305693 Size: SH
  1. Install the exhaust manifold studs if removed.

    2. Object Number: 910980 Size: SH
  2. Install the right exhaust manifold gasket (1).
  3. Install the right exhaust manifold (2).

    4. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the right exhaust manifold studs (4) and the nuts (3).

    5. Tighten
    Tighten the studs and the nuts to 30 N·m (22 lb ft).

  5. Raise the vehicle.

    6. Object Number: 911025 Size: SH
  6. Install the exhaust gas recirculation (EGR) valve inlet adapter pipe bolt (1) to the right exhaust manifold.

    7. Tighten
    Tighten the bolt to 29 N·m (21 lb ft).

  7. Lower the vehicle.

    8. Object Number: 911016 Size: SH
  8. Install the right exhaust manifold heat shield (1).
  9. Install the right exhaust manifold heat shield bolts (2).

    10. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 910986 Size: SH
  10. Install the right engine lift bracket (1).
  11. Install the right engine lift bracket bolt (2) and the nut (3).

    12. Tighten
    Tighten the bolt and the nut to 30 N·m (22 lb ft).


    Object Number: 911011 Size: SH
  12. Install the fuel injector sight shield bracket (1).
  13. Install the fuel injector sight shield bracket nuts (2).

    14. Tighten
    Tighten the nuts to 30 N·m (22 lb ft).

  14. Install the right side spark plugs to cylinders 2, 4 and 6. Refer to Spark Plug Replacement in Engine Controls - 3.8L.

    15. Object Number: 911055 Size: SH
  15. Install the HO2S (2) to the right exhaust manifold. Refer to Heated Oxygen Sensor 1 Replacement
  16. Install the HO2S electrical connector (1) to the engine sight shield bracket.
  17. Connect the HO2S electrical connector (1).
  18. Return the engine to the original position.
  19. Raise the vehicle.

    20. Object Number: 911163 Size: SH
  20. Install the catalytic converter pipe (3) to the right exhaust manifold.
  21. Install the catalytic converter pipe stud nuts (2) to the right exhaust manifold.

    22. Tighten
    Tighten the stud nuts to 35 N·m (26 lb ft).

  22. Lower the vehicle.

    23. Object Number: 911162 Size: SH
  23. Install the exhaust crossover pipe studs (3) to the right exhaust manifold.

    24. Tighten
    Tighten the studs to 20 N·m (15 lb ft).


    Object Number: 910984 Size: SH
  24. Install the exhaust crossover heat shield (2).
  25. Install the exhaust crossover heat shield nuts (1).

    26. Tighten
    Tighten the nuts to 20 N·m (15 lb ft).

  26. Install the engine mount struts. Refer to Engine Mount Strut Replacement - Right Side and Engine Mount Strut Replacement - Left Side in Engine Mechanical - 3.8L.
  27. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical - 3.8L.

Exhaust Manifold Replacement - Right Side LY7


Object Number: 1577308 Size: SF

Callout

Component Name

Notice: Refer to Fastener Notice in the Preface section.

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Preliminary Procedure

Remove the exhaust crossover pipe. Refer to Exhaust Crossover Pipe Replacement.

1

Bolts, Exhaust Manifold (Qty: 7)

Tighten
20 N·m (15 lb ft)

2

Manifold, Right Rear Exhaust

3

Gasket, Right Rear Exhaust Manifold