GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Engine 🢒 Engine Mechanical - 4.6L 🢒 Exhaust Manifold Installation - Left Side

Exhaust Manifold Installation - Left Side W/O RPO NC1 or NF7

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 350279 Size: SH
  1. If the engine is equipped with coolant heaters, install the left side (1) heater as follows:
    2. 1.1. Place the coolant heater (1) in position on the cylinder block.
    1.2. Install the coolant heater bolt and tighten to 10 N·m (89 lb in).

    Object Number: 315063 Size: SH
  2. With the manifold still on the bench, position a new manifold gasket (1) in place on the manifold sealing surface.
  3. Install 2 outer manifold bolts (6) in the manifold to retain the gasket.
  4. Install a new manifold to intermediate pipe flange gasket (5).
  5. Using 2 hands, place the manifold (2) in the intermediate pipe and onto the cylinder head.
  6. Install new manifold flange bolts (3) for maximum joint integrity. Hand tighten. Do not torque the flange bolts to specification until the engine is mounted in the vehicle.
  7. Hand tighten the 2 outer manifold bolts.
  8. Install the remaining manifold bolts. Tighten the exhaust manifold bolts (6) to 25 N·m (18 lb ft).

    9. Object Number: 331274 Size: SH
  9. Coat the oxygen sensor threads with high temperature anti-seize, GM P/N 12377953 or equivalent.
  10. Install the oxygen sensor (1) and tighten to 40 N·m (30 lb ft).

Exhaust Manifold Installation - Left Side With RPO NC1 or NF7

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 350279 Size: SH
  1. If the engine is equipped with coolant heaters, install the left side (1) heater as follows:
    2. 1.1. Place the coolant heater (1) in position on the cylinder block.
    1.2. Install the coolant heater bolt and tighten to 10 N·m (89 lb in).

    Object Number: 871664 Size: SH

    Note: DO NOT reuse the exhaust manifold gasket.

  2. With the manifold still on the bench, position a new manifold gasket (1) in place on the manifold sealing surface.
  3. Install 2 outer manifold bolts (6) in the manifold to retain the gasket.
  4. Install a new manifold to intermediate pipe flange gasket (5).
  5. Using 2 hands, place the manifold (2) in the intermediate pipe and onto the cylinder head.
  6. Install new manifold flange bolts (3) for maximum joint integrity. Hand tighten. Do not torque the flange bolts to specification until the engine is mounted in the vehicle.
  7. Hand tighten the 2 outer manifold bolts.
  8. Install the remaining manifold bolts and tighten to 25 N·m (18 lb ft).

    9. Object Number: 331274 Size: SH
  9. Coat the oxygen sensor threads with high temperature anti-seize, GM P/N 12377953 or equivalent.
  10. Install the oxygen sensor (1) and tighten to 40 N·m (30 lb ft).

    11. Object Number: 1207116 Size: SH

    Note: DO NOT reuse the old secondary air injection (AIR) valve pipe gasket.

  11. Install the NEW AIR valve pipe gasket.
  12. Install the AIR valve.
  13. Install the AIR valve nuts to the mounting bracket and tighten to 9 N·m (80 lb in).
  14. Install the AIR valve bolt through the mounting bracket and tighten to 9 N·m (80 lb in).
  15. Install the AIR valve pipe nuts to the exhaust manifold and tighten to 9 N·m (80 lb in).