Exhaust Manifold Replacement Left

Tools Required

J 28467-A Engine Support Fixture

1. Remove the radiator cradle beauty panel.
2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.
3. Install the J 28467-A .
4. Raise the vehicle on the hoist. Refer to Lifting and Jacking the Vehicle in General Information.
5. Remove the engine mount and bracket. Refer to Engine Mount Replacement
6. Remove the four bolts securing the rear generator bracket.



7. Remove the two bolts at the manifold outlet flange (4).
8. Disconnect the oxygen sensor wire.



9. Remove the exhaust manifold bolts.
10. Remove the manifold and the gasket. Discard the gasket.
11. Remove the oxygen sensor if replacement is necessary. Refer to Heated Oxygen Sensor Replacement in Engine Controls.

1. Install the exhaust manifold by inserting the outlet pipe partially into the exhaust crossover pipe.
2. Move the manifold into position.
3. Install the gasket to the manifold. Hold the gasket in position by inserting two bolts.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Start the remainder of the manifold bolts.

Tighten
Tighten the bolts to 25 N·m (18 lb ft).




5. Install the two bolts at the manifold outlet flange.

Tighten
Tighten the two bolts to 25 N·m(18 lb ft).

6. Install the oxygen sensor. Refer to Heated Oxygen Sensor Replacement in Engine Controls.
7. Install the engine mount and bracket. Refer to Engine Mount Replacement
8. Install the rear generator bracket.

Tighten
Tighten the four screws to 50 N·m (37 lb ft).

9. Lower the vehicle.



10. Remove the J 28467-A .
11. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.
12. Install the radiator cradle beauty cover.

Exhaust Manifold Replacement Right

1. Remove the rear oxygen sensors at the back edge of the right cam cover and the rear pipe. Refer to Heated Oxygen Sensor Replacement Replacement in Engine Controls.
2. Disconnect the harness clip.
3. Raise the vehicle on the hoist. Refer to Lifting and Jacking the Vehicle in General Information.



4. Remove the exhaust manifold rear pipe from the front of the catalytic converter.
5. Remove the suspension position sensor at the lower control arm from both sides.
6. Remove or disconnect the intermediate shaft, as necessary, from the steering gear. Refer to Intermediate Steering Shaft Seal Replacement in Steering Wheel and Column.



7. Support the rear cross member of the engine cradle with a tall screw jack.
8. Remove the four rear cradle-to-body bolts.
9. Lower the rear of the engine cradle.



10. Remove the four bolts securing the exhaust manifold rear pipe (2) to the exhaust manifold and crossover exhaust pipe.



11. Remove the right side cylinder head to the transaxle brace.



12. Remove the exhaust manifold nuts. Some nuts may require removal with an open end wrench or universal coupling tools.
13. Remove the manifold and the gasket. Discard the gasket.
14. Remove the oxygen sensor. Refer to Heated Oxygen Sensor Replacement in Engine Controls.

1. Coat the oxygen sensor threads with high temperature anti-seize, GM P/N 5613695 or equivalent.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

2. Install the oxygen sensor.

Tighten
Tighten the sensor to 40 N·m (30 lb ft).




3. Install the manifold gasket over the cylinder head studs.
4. Install the manifold and the nuts.

Tighten
Tighten the nuts to 25 N·m (18 lb ft).




5. Install the right side cylinder head to the transaxle brace.

Tighten
Tighten the bolt and nut to 47 N·m (35 lb ft).




6. Install the exhaust manifold rear pipe (2) and secure with four bolts. New bolts are recommended for maximum joint integrity.

Tighten
Tighten the M8 bolts to 30 N·m (22 lb ft).

•	Tighten the M10 bolts to 40 N·m (30 lb ft).

7. Raise the engine cradle into position.
8. Install the engine cradle to body bolts

Tighten
Tighten the four bolts to 100 N·m (74 lb ft).

9. Connect the intermediate shaft to the steering gear.

Tighten
Tighten the bolt to 50 N·m (37 lb ft).

Important: When correctly aligned the flanges for the converter and the exhaust manifold rear pipe are parallel. If this condition does not exist, realign the exhaust manifold rear pipe by loosening the exhaust manifold bolts and repositioning the exhaust manifold rear pipe.

10. Connect the exhaust manifold rear pipe to the catalytic converter with four nuts.

Tighten
Tighten the nuts to 25 N·m (18 lb ft).

11. Connect the suspension position sensors to the lower control arms.



12. Install the exhaust down pipe to the catalytic converter.

Tighten
Tighten the nuts to 25 N·m (18 lb ft).

13. Remove the screw jack stand.
14. Lower the vehicle.
15. Connect the oxygen sensor. Refer to Heated Oxygen Sensor Replacement in Engine Controls.
16. Install the harness retainer.