Exhaust Manifold: Service and Repair

Exhaust Manifold Replacement (LLR)

Removal Procedure
Warning: Refer to Exhaust Service Warning (Exhaust Service Warning).

Warning: Refer to Protective Goggles and Glove Warning (Protective Goggles and Glove Warning).





1. Remove the secondary air injection (AIR) check valve. Refer to Secondary Air Injection Check Valve Replacement (Service and Repair).
2. Remove the exhaust seal. Refer to Exhaust Seal Replacement (LH8) (Service and Repair)Exhaust Seal Replacement (LLR) (Service and Repair).
3. Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement (LLR) (Exhaust Manifold Heat Shield Replacement).
4. Remove the exhaust manifold bolts.
5. Remove the exhaust manifold.




6. Remove and discard the exhaust manifold gasket.
7. Clean and inspect the exhaust manifold. Refer to Exhaust Manifold Cleaning and Inspection (60. Exhaust Manifold Cleaning and Inspection).

Installation Procedure




1. Clean and apply threadlock GM P/N 12345493 (Canadian P/N 10953488) to the exhaust manifold bolt threads.
2. Position a NEW exhaust manifold gasket onto the cylinder head.




3. Position the exhaust manifold against cylinder head.
4. Install the exhaust manifold bolts.





Caution: Refer to Fastener Caution (Fastener Caution).

5. Tighten the exhaust manifold bolts.

1. Tighten the bolts a first pass in sequence to 20 Nm (15 lb ft).
2. Tighten the bolts a second pass in sequence to 20 Nm (15 lb ft).
3. Tighten the bolts a final pass in sequence to 20 Nm (15 lb ft).

6. Install the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement (LLR) (Exhaust Manifold Heat Shield Replacement).
7. Install the exhaust seal. Refer to Exhaust Seal Replacement (LH8) (Service and Repair)Exhaust Seal Replacement (LLR) (Service and Repair).
8. Install the AIR check valve. Refer to Secondary Air Injection Check Valve Replacement (Service and Repair).