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 clean and free of debris or threadlocking material.

1. If necessary, install the exhaust manifold heat shield and bolts.

   Tighten 

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

2. 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.
   Fig 1: Exhaust Manifold Bolts

   Courtesy of GENERAL MOTORS CORP.
3. Position the exhaust manifold and a NEW gasket into place.
4. Install the exhaust manifold bolts.

   Tighten 

   1. 4.1. 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, working toward the outside bolts.
   2. 4.2. 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, working toward the outside bolts.
5. Bend over the exposed edge of the exhaust manifold gasket at the front of the right cylinder head.
6. Install the ignition coil bracket.
7. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent to the threads of the bracket studs.
8. Install the ignition coil bracket studs.

   Tighten 

   Tighten the ignition coil bracket studs to 12 N.m (106 lb in).

9. Install the spark plugs. Refer to SPARK PLUGS in Engine Controls - 5.7 L.
10. Install the oil level indicator tube. Refer to OIL LEVEL INDICATOR AND TUBE REPLACEMENT in Engine Mechanical - 5.7 L.
    Fig 2: Ignition Coil Bracket Studs

    Courtesy of GENERAL MOTORS CORP.

    Important:  Ensure that the AIR pipe bracket slides behind the bolt at the left cylinder head.

11. Position the AIR pipe (with check valve) and NEW gasket into place.
12. Install the AIR pipe bolts.

    Tighten 

    Tighten the AIR pipe bolts to 20 N.m (15 lb ft).

    Fig 3: AIR Pipe Bolts

    Courtesy of GENERAL MOTORS CORP.
13. Tighten the AIR pipe bolt at the rear of the left cylinder head.

    Tighten 

    Tighten the AIR pipe bolt to 20 N.m (15 lb ft).

    Fig 4: Tightening Air Pipe Bolt At Rear Of Left Cylinder Head

    Courtesy of GENERAL MOTORS CORP.
14. Install the AIR pipe hose (1) to the right check valve.
15. Install the hose clamp at the right check valve.
16. Raise the vehicle.
    Fig 5: Installing Air Pipe Hose To Right & Left Check Valve

    Courtesy of GENERAL MOTORS CORP.
17. Apply anti-sieze compound GM P/N 12377953 or equivalent to the threads of the oxygen sensor.
    NOTE: Refer to OXYGEN SENSOR NOTICE in Cautions and Notices.
18. Install the oxygen sensor.

    Tighten 

    Tighten the oxygen sensor to 42 N.m (30 lb ft).

19. Connect the oxygen sensor electrical connector.
20. Install the CPA lock.
    Fig 6: Connecting Oxygen Sensor Electrical Connector

    Courtesy of GENERAL MOTORS CORP.
21. Install the exhaust manifold nuts. (left side shown, right side similar)

    Tighten 

    Tighten the exhaust manifold nuts to 20 N.m (15 lb ft).

22. Lower the vehicle.
    Fig 7: Exhaust Manifold Nuts

    Courtesy of GENERAL MOTORS CORP.
23. Install the fuel rail cover.
    Fig 8: Fuel Rail Cover

    Courtesy of GENERAL MOTORS CORP.