H2 V8-6.2L (2008)
Notice: Refer to Fastener Notice (See: Service Precautions/Vehicle Damage Warnings/Fastener Notice) .
1. Install the heat shield (2), and bolts (3) to the exhaust manifold (1), if necessary.
Tighten the bolts to 9 N.m (80 lb in).
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 Diagnostics (OBD) II system performance.
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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.
2. Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 101953488) or equivalent to the threads of the exhaust
manifold bolts.
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 two bolts.
Alternate from side-to-side, and work toward the outside bolts.
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.
4. Install the spark plug wires. Refer to Spark Plug Wire Replacement (See: Engine/Tune-up and Engine Performance Checks/Ignition Cable/Service
and Repair) .
5. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head.
6. Raise the vehicle.
7. Install the exhaust manifold pipe nuts.
