Exhaust Manifold: Service and Repair

Exhaust Manifold Replacement

Removal Procedure

Caution: Refer to Exhaust Service Caution.

Caution: Refer to Protective Goggles and Glove Caution.




1. Remove the secondary air injection (AIR) check valve.
2. Remove the exhaust seal.
3. Remove the exhaust manifold heat shield.
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.

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.





Notice: Refer to Fastener Notice.

5. Tighten the exhaust manifold bolts.
1. Tighten the bolts a first pass in sequence to 20 N.m (15 lb ft).
2. Tighten the bolts a second pass in sequence to 20 N.m (15 lb ft).
3. Tighten the bolts a final pass in sequence to 20 N.m (15 lb ft).
6. Install the exhaust manifold heat shield.
7. Install the exhaust seal.
8. Install the AIR check valve.