87. Exhaust Manifold Installation - Right

Exhaust Manifold Installation - Right





1. 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 Diagnostic (OBD) II system performance.
^ The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material.

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. Install the exhaust manifold gasket and exhaust manifold.

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

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





5. Install the heat shield (603) and bolts (604).
^ Tighten the heat shield bolts to 9 Nm (80 lb in).