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Exhaust Manifold Replacement - Right Side LS7 or LS9


Object Number: 1707288 Size: MF

Callout

Component Name

Caution: The oxygen sensor may be difficult to remove when the engine temperature is below 48°C (120°F). Excessive force may damage threads in the exhaust manifold or the exhaust pipe.

Preliminary Procedure

  1. Remove the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement.
  2. Remove the spark plugs. Refer to Spark Plug Replacement.
  3. Remove the right catalytic converter. Refer to Catalytic Converter Replacement - Right Side.

1

Exhaust Manifold Bolt (Qty: 6)

Caution: Refer to Fastener Caution in the Preface section.

Procedure

  1. Apply a 5 mm (0.2 in) wide band thread of threadlock to the threads of the exhaust manifold bolts.
  2. Tighten the bolts starting at in the center, alternating side-to-side, working outward.

Note: The cylinder head bolt hole threads must be cleaned and free of debris or threadlock material.

Tighten

    • First Pass: 15 N·m (11 lb ft)
    • Final Pass: 25 N·m (18 lb ft)

2

Exhaust Manifold

3

Exhaust Manifold Gasket

Note: Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.

4

Exhaust Manifold Pipe Gasket

Note: Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.

Exhaust Manifold Replacement - Right Side LS3

Removal Procedure
  1. Remove the engine sight cover Refer to Upper Intake Manifold Sight Shield Replacement.
  2. Remove the spark plugs. Refer to Spark Plug Replacement.
  3. Remove the bank 2, sensor 1 oxygen sensor. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 1.
  4. Raise the vehicle. Refer to Lifting and Jacking the Vehicle.
  5. Remove the catalytic convertor. Refer to Catalytic Converter Replacement - Right Side.

    6. Object Number: 1461911 Size: SH

    Note: In the following service procedure, it may be necessary to remove the heat shield from the exhaust manifold.

  6. Remove the mounting nuts for the exhaust manifold.
  7. Remove the exhaust manifold and gasket.

Installation Procedure

Note: 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.

    Caution: Refer to Fastener Caution in the Preface section.

  1. If necessary, install the exhaust manifold heat shield and bolts and tighten to 9 N·m (80 lb in).

    2. Note: In the following service procedure, DO NOT tighten the exhaust clamp. Leave it loosened so that the exhaust manifold and gasket can be aligned on the cylinder head.

  2. Install the catalytic convertor to the intermediate pipe.

    3. Object Number: 1461911 Size: SH

    Note: Use one or two bolts to hold the manifold and gasket in place.

  3. Install the exhaust manifold and gasket.
  4. 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.
  5. Install the exhaust manifold bolts using the following sequence:

    6.         Note: Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, working toward the outside bolts.

    5.1. Tighten the exhaust manifold bolts a first pass to 15 N·m (11 lb ft).

            Note:  Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, working toward the outside bolts.

    5.2. Tighten the exhaust manifold bolts a final pass to 25 N·m (18 lb ft).
  6. Install the spark plugs. Refer to Spark Plug Replacement.
  7. Install the engine sight cover Refer to Upper Intake Manifold Sight Shield Replacement.
  8. Install the bank 2, sensor 1 oxygen sensor. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 1.
  9. Install the catalytic convertor to the exhaust manifold nuts. Refer to Catalytic Converter Replacement - Right Side.