Left

Exhaust Manifold Replacement - Left (5.3L Engine)

Removal Procedure
1. Raise and suitably support the vehicle.





2. Remove the exhaust manifold pipe nuts.
3. Lower the vehicle.
4. Remove the spark plugs.





5. Remove the heat shield bolts, and shield from the exhaust manifold.
6. Remove the exhaust manifold bolts, manifold, and gasket.
7. Discard the gasket.
8. Clean and inspect the exhaust manifold.

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 to debris or threadlocking material.

Important: Do not apply sealant to the first three threads of the bolt





1. Apply a 5 mm (0.2 inch) wide band of threadlock GM P/N 12345493, (Canadian P/N 10953488), or equivalent to the threads of the exhaust manifold bolts.

Notice: Refer to Fastener Notice in Service Precautions.

2. Install the exhaust manifold, NEW gasket and bolts.
2.1. Tighten the bolts a first pass to 15 Nm (11 ft. lbs.). Tighten the bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside bolts.
2.2. Tighten the bolts a final pass to 25 Nm (18 ft. lbs.). Tighten the bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside bolts.
3. Install the heat shield, manifold.
^ Tighten the bolts to 9 Nm (80 inch lbs.).





4. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head.
5. Install the spark plugs.
6. Raise the vehicle.
7. Install the exhaust manifold pipe nuts.
^ Tighten the nuts to 50 Nm (37 ft. lbs.).
8. Lower the vehicle.