Exhaust Manifold Installation - Left

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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.

IMPORTANT: Do not apply sealant to the first three threads of the bolt.

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 and NEW exhaust manifold gasket.
NOTE: Refer to FASTENER NOTICE .

Fig 1: Installing Exhaust Manifold & Gasket
Courtesy of GENERAL MOTORS CORP.
Install the exhaust manifold bolts.
Tighten
1. 3.1. Tighten the exhaust manifold bolts a first pass to 15 N.m (11 lb ft). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside bolts.
2. 3.2. Tighten the exhaust manifold bolts a final pass to 25 N.m (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.
Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head.
Install the heat shield (2) and bolts (3).
Tighten

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

Fig 2: Installing Heat Shield & Bolts
Courtesy of GENERAL MOTORS CORP.