Exhaust Manifold Replacement - Left

Exhaust Manifold Replacement - Left (RPO LS4)
Removal Procedure





1. Remove the engine sight shield.
2. Remove the exhaust crossover pipe nuts from the left exhaust manifold.
3. Remove the left side spark plugs.
4. Remove the oil level indicator tube.





5. Remove the exhaust manifold heat shield bolts (604).
6. Remove the exhaust manifold heat shield (603).





7. Remove the exhaust manifold bolts.
8. Remove the exhaust manifold.
9. Remove and discard the exhaust manifold gasket.
10. Clean and inspect the left exhaust manifold.

Installation Procedure

Important:
^ Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets my affect vehicle emissions and/or On Board Diagnostic (OBD) II system performance.
^ The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material.
^ DO NOT apply threadlock to the first three thread of the bolts.





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.

2. Notice: Refer to Fastener Notice in Service Precautions.

Install a NEW exhaust manifold gasket, the exhaust manifold and bolts.
1 Tighten the bolts a first pass to 15 Nm (11 ft. lbs.). Tighten the bolts beginning with the center 2 bolts. Alternate from side to side, and work toward the outside.
2 Tighten the bolts a final pass to 25 Nm (18 ft. lbs.). Tighten the bolts beginning with the center 2 bolts. Alternate from side to side, and work toward the outside.
3. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head.





4. Install the exhaust manifold heat shield (603).
5. Install the exhaust manifold heat shield bolts (604).
Tighten the bolts to 9 Nm (80 inch lbs.).
6. Install the oil level indicator tube
7. Install the left side spark plugs.





8. Install the exhaust crossover pipe nuts from the left exhaust manifold.
Tighten the nuts to 20 Nm (15 ft. lbs.).
9. Install the engine sight shield.