Exhaust Manifold Installation - Left Side

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Fig 1: View Of Exhaust Manifold & Heat Shield

Courtesy of GENERAL MOTORS CORP.

NOTE: 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: Tighten the heat shield bolts to 9 N.m (80 lb in).
Install the exhaust pipe studs (605).
Tighten: Tighten the studs to 20 N.m (15 lb ft).

Fig 2: View Of Exhaust Manifold & Gasket

Courtesy of GENERAL MOTORS CORP.

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 .
Install the exhaust manifold, NEW gasket, and bolts.
Tighten:
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.
Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head.