87. Exhaust Manifold Installation - Left Side

Exhaust Manifold Installation - Left Side





Notice: Refer to Fastener Notice.

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.

^ Do not apply sealant to the first 3 threads of the bolt.

Install the heat shield (603) and bolts (604).

Tighten the heat shield bolts to 9 N.m (80 lb in).

1. Install the exhaust pipe studs (605).

Tighten the studs to 20 N.m (15 lb ft).




2. 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. Refer to Sealers, Adhesives, and Lubricants.
3. Install the exhaust manifold, NEW gasket, and bolts.
1. Tighten the exhaust manifold bolts a first pass to 15 N.m (11 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
2. Tighten the exhaust manifold bolts a final pass to 20 N.m (15 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 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.