Exhaust Manifold Replacement - Right Side LY7

Warning: Refer to Exhaust Service Warning in the Preface section.

Warning: Refer to Protective Goggles and Glove Warning in the Preface section.




1. Remove the catalytic converter. Refer to Catalytic Converter Replacement - Right Side.
2. Remove the exhaust manifold lower bolts.
3. Lower the vehicle half way.



4. Remove the exhaust manifold upper bolts.



5. Remove the exhaust manifold.



6. Remove and discard the exhaust manifold gasket.

1. Install one upper exhaust manifold bolt (1) to the exhaust manifold.
2. Place the NEW exhaust manifold gasket onto the bolt.
3. Position and install the exhaust manifold (with gasket) to the cylinder head.



4. Loosely install the remaining upper exhaust manifold bolts.
5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.



6. Loosely install the lower exhaust manifold bolts.

Caution: Refer to Fastener Caution in the Preface section.

7. Tighten the exhaust manifold bolts to 20 N·m (15 lb ft).
8. Install the catalytic converter. Refer to Catalytic Converter Replacement - Right Side.

Exhaust Manifold Replacement - Right Side LZ4

Special Tools

J 39194-B Heated Oxygen Sensor Wrench

1. Remove the generator. Refer to Generator Replacement.
2. Remove the connector position assurance (CPA) retainer (2).
3. Disconnect the heated oxygen sensor (HO2S) electrical connector (1).

Note: The HO2S uses a permanently attached pigtail and connector. This pigtail should not be removed from the sensor. Damage or removal of the pigtail or connector will affect proper operation of the sensor.

4. Remove the HO2S using the J 39194-B .



5. Remove the exhaust gas recirculation (EGR) pipe bolts (3). Reposition the pipe slightly.



6. Remove the upper exhaust manifold nuts.
7. Remove the right catalytic converter. Refer to Catalytic Converter Replacement - Right Side.
8. Remove the lower exhaust manifold nuts.
9. Remove the exhaust manifold.
10. Remove and discard the exhaust manifold gasket.

1. Install a NEW exhaust manifold gasket onto the cylinder head studs.
2. Install the exhaust manifold.

Caution: Refer to Fastener Caution in the Preface section.

3. Install the exhaust manifold nuts.

Tighten
Tighten the nuts to 16 N·m (12 lb ft).

4. Install the right catalytic converter. Refer to Catalytic Converter Replacement - Right Side.



5. Position the EGR pipe as necessary, and install the EGR pipe bolts (3).

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





Note: Whenever the oxygen sensor is removed, coat the threads with nickel-based anti-seize compound such as GM P/N 5613695, or equivalent.

6. Install the HO2S using J 39194-B .

Tighten
Tighten the sensor to 42 N·m (31 lb ft).

7. Connect the HO2S electrical connector (1).
8. Install the CPA retainer (2).
9. Ensure that the connector rosebud is attached to the bracket.
10. Install the generator. Refer to Generator Replacement.

Exhaust Manifold Replacement - Right Side LZ9 w/RPO MT2

Special Tools

J 39194-B Heated Oxygen Sensor Wrench

1. Remove the generator. Refer to Generator Replacement.
2. Remove the connector position assurance (CPA) retainer (5).
3. Disconnect the engine harness electrical connector (4) heated oxygen sensor (HO2S) electrical connector (4).
4. Remove the HO2S clip (3) from the oil level indicator tube bracket.




Note: The HO2S uses a permanently attached pigtail and connector. This pigtail should not be removed from the sensor. Damage or removal of the pigtail or connector will affect proper operation of the sensor.

5. Remove the HO2S using the J 39194-B .



6. Remove the exhaust manifold shield bolts.
7. Remove the exhaust manifold shield.



8. Remove the upper exhaust manifold bolts.
9. Remove the right catalytic converter. Refer to Catalytic Converter Replacement - Right Side.
10. Remove the lower exhaust manifold bolt.
11. Remove the exhaust manifold.
12. Remove and discard the exhaust manifold gasket.

1. Install a NEW exhaust manifold gasket onto the cylinder head studs.
2. Install the exhaust manifold.

Caution: Refer to Fastener Caution in the Preface section.

3. Install the exhaust manifold bolts.

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

4. Install the right catalytic converter. Refer to Catalytic Converter Replacement - Right Side.



5. Install the exhaust manifold shield.
6. Install the exhaust manifold shield bolts.

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





Note: Whenever the oxygen sensor is removed, coat the threads with nickel-based anti-seize compound such as GM P/N 5613695, or equivalent.

7. Install the HO2S using J 39194-B .

Tighten
Tighten the sensor to 42 N·m (31 lb ft).




8. Connect the engine harness electrical connector (4) to the HO2S electrical connector (4).
9. Install the CPA retainer (5).
10. Install the HO2S clip (3) to the oil level indicator tube bracket.
11. Install the generator. Refer to Generator Replacement.

Exhaust Manifold Replacement - Right Side LZ9 w/RPO M15

Special Tools

J 39194-B Heated Oxygen Sensor Wrench

1. Remove the generator. Refer to Generator Replacement.
2. Remove the connector position assurance (CPA) retainer (2).
3. Disconnect the heated oxygen sensor (HO2S) electrical connector (1).
4. Remove the HO2S clip from the ignition control module bracket.




Note: The HO2S uses a permanently attached pigtail and connector. This pigtail should not be removed from the sensor. Damage or removal of the pigtail or connector will affect proper operation of the sensor.

5. Remove the HO2S using the J 39194-B .



6. Remove the exhaust manifold shield bolts.
7. Remove the exhaust manifold shield.



8. Remove the upper exhaust manifold bolts.
9. Remove the right catalytic converter. Refer to Catalytic Converter Replacement - Right Side.
10. Remove the lower exhaust manifold bolt.
11. Remove the exhaust manifold.
12. Remove and discard the exhaust manifold gasket.

1. Install a NEW exhaust manifold gasket onto the cylinder head studs.
2. Install the exhaust manifold.

Caution: Refer to Fastener Caution in the Preface section.

3. Install the exhaust manifold bolts.

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

4. Install the right catalytic converter. Refer to Catalytic Converter Replacement - Right Side.



5. Install the exhaust manifold shield.
6. Install the exhaust manifold shield bolts.

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





Note: Whenever the oxygen sensor is removed, coat the threads with nickel-based anti-seize compound such as GM P/N 5613695, or equivalent.

7. Install the HO2S using J 39194-B .

Tighten
Tighten the sensor to 42 N·m (31 lb ft).




8. Connect the HO2S electrical connector (1).
9. Install the CPA retainer (2).
10. Install the HO2S clip to the ignition control module bracket.
11. Install the generator. Refer to Generator Replacement.