Installation Procedure
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Install the heat shield (2), and bolts (3) to the exhaust manifold (1), if necessary.
Tighten: Tighten the bolts to 9 N.m (80 lb in).
- 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 Diagnostics (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 three threads of the bolt.
- Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 or equivalent to the threads of the exhaust manifold bolts.
- Install the exhaust manifold, NEW gasket and bolts.
Tighten:
- 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.
- 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.
- Raise the vehicle.
- Install the exhaust manifold pipe nuts.
Tighten: Tighten the nuts to 50 N.m (37 lb ft).
- Lower the vehicle.
- Install the spark plugs. Refer to SPARK PLUGS .
- Install the ignition coils. Refer to IGNITION COILS .
NOTE:
Refer to FASTENER NOTICE
.
IMPORTANT: