H3 V8-5.3L (2008)
8. Remove the exhaust manifold (2) and gasket (1). Discard the gasket.
Installation Procedure
Important:
*
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.
Important: Do not apply sealant to the first 3 threads of the bolt.
1. 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.
2. Ensure that the exhaust seal is still seated on the catalytic converter recess.
3. Install one exhaust manifold bolt to the exhaust manifold (2) and place the NEW gasket (1) onto the bolt.
4. Install the exhaust manifold to the catalytic converter flange and position the manifold to the cylinder head.
5. Install the oil level indicator and tube. Refer to Oil Level Indicator and Tube Replacement (See: Engine/Engine Lubrication/Engine Oil Dip Stick
- Dip Stick Tube/Service and Repair) .
Notice: Refer to Fastener Notice (See: Service Precautions/Vehicle Damage Warnings/Fastener Notice) .
6. Install the remaining exhaust manifold bolts (3).
1. Tighten the bolts a first pass to 15 N.m (11 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work
toward the outside bolts.
2. Tighten the bolts a final pass to 25 N.m (18 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work
toward the outside bolts.
7. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the front of the right cylinder head.
8. Install the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Left Side (LH8) (See: Heat Shield/Service and
Repair/Exhaust Manifold Heat Shield Replacement - Left Side) .
9. Install the spark plugs. Refer to Spark Plug Replacement (See: Engine/Tune-up and Engine Performance Checks/Spark Plug/Service and Repair) .
10. Raise the vehicle.
