Installation Procedure
- 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 thread locking material.
- Apply a 5 mm (0.2 in) wide band of thread lock GM P/N 12345493 (Canadian P/N 10953488) 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 25 N.m (18 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 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 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 front of the right cylinder head.
- Install the heat shield (2) and bolts (1) to the exhaust manifold (1).
Tighten: Tighten the bolts to 9 N.m (80 lb in).
- Install the engine oil level indicator tube. Refer to Oil Level Indicator and Tube Replacement in Engine Mechanical - 6.0L.
- Install the spark plugs. Refer to Spark Plug Replacement in Engine Controls - 6.0L.
- Install the surge tank. Refer to Surge Tank Replacement in Engine Cooling.
- Raise the vehicle.
- Install the exhaust manifold pipe nuts.
Tighten: Tighten the nuts to 50 N.m (37 lb ft).
- Lower the vehicle.
IMPORTANT:
IMPORTANT:
Do not apply sealant to the first 3 threads of the bolt.
NOTE:
Refer to Fastener Notice
in Cautions and Notices.
Fig 2: View Of Heat Shield Bolts, And Shield From The Exhaust Manifold (4.8L, 5.3L, and 6.0L Engines)