87. Exhaust Manifold Installation - Left
Exhaust Manifold Installation - LeftImportant:
- 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
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.
2. Install the exhaust manifold and NEW exhaust, manifold gasket,
Notice: Refer to Fastener Notice in Service Precautions.
3. Install the exhaust manifold bolts
3.1. Tighten the exhaust manifold bolts a first pass to 15 Nm (11 ft. lbs.). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside bolts.
3.2. Tighten the exhaust manifold bolts a final pass to 25 Nm (18 ft. lbs.). 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 rear of the left cylinder head.
5. Install the heat shield (2) and bolts (3).
- Tighten the heat shield bolts to 9 Nm (80 inch lbs.).