Installation Procedure
IMPORTANT:
Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may effect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.
The cylinder head exhaust manifold bolt hole threads must be cleaned and free of debris or threadlocking material.
The cylinder head exhaust manifold bolt hole threads must be cleaned and free of debris or threadlocking material.
IMPORTANT:
In the following service procedure, position the catalytic convertor on the intermediate pipe, but DO NOT tighten the clamp. Leave it loose to allow the alignment of the exhaust manifold on the cylinder head.
- Install the catalytic convertor.
- Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953489), or equivalent to the threads of the exhaust manifold bolts.
- Position the exhaust manifold and a NEW gasket into place.NOTE: Refer to Fastener Notice .
- Install the exhaust manifold 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 2 bolts. Alternate from side-to-side, working 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, working toward the outside bolts.
- Install the bank 1, sensor 1 oxygen sensor in the exhaust manifold oxygen sensor. Refer to Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 for the 6.0L engine or Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 for the 7.0L engine.
- Install the spark plugs. Refer to Spark Plug Replacement for the 6.0L engine or Spark Plug Inspection for the 7.0L engine.
- Install the generator. Refer to Generator Replacement (6.0L) or Generator Replacement (7.0L) .
- Install the engine sight cover. Refer to Engine Sight Shield Replacement for the 6.0L engine or Engine Sight Shield Replacement for the 7.0L engine.
- Install the catalytic convertor to exhaust manifold nuts.
Tighten: Tighten the exhaust manifold nuts to 20 N.m (15 lb ft).
- Tighten the exhaust clamps for the catalytic convertor.
Tighten: Tighten the exhaust clamps for the catalytic convertor bolt to 20 N.m (15 lb ft).