GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 XLR 🢒 Engine 🢒 Engine Cooling 🢒 Supercharger Inlet Duct Assembly Replacement

Removal Procedure

    Important: The front section of the supercharger inlet duct assembly can be serviced independently of the rear section.

  1. The supercharger must be removed to remove the rear section of the supercharger inlet duct assembly.

    2. Object Number: 1685817 Size: SH
  2. Remove the engine sight shield. Refer to Intake Manifold Sight Shield Replacement .
  3. Remove the air cleaner outlet duct (1). Refer to Air Cleaner Outlet Duct Replacement .

    4. Object Number: 1685833 Size: SH

    Important: There is a positive crankcase ventilation (PCV) hose fitting on the underside of the supercharger inlet duct.

  4. Disconnect the (PCV) hose fitting (1) from the underside of the inlet duct assembly.

    5. Object Number: 1685839 Size: SH
  5. Loosen the rear screw clamps (2) located between the front and rear section of the inlet duct assembly.
  6. Remove all the ball studs (1) that retain the inlet duct to the supercharger. There are a total of 6 ball studs.
  7. Remove the front section of the supercharger inlet duct.

    8. Object Number: 1685842 Size: SH
  8. Remove the hood assembly. Refer to Hood Replacement .
  9. Remove supercharger assembly. Refer to Supercharger Replacement .

    10. Object Number: 1685836 Size: SH
  10. Loosen the rear screw clamps on the inlet duct seal.
  11. Remove the rear section of the supercharger inlet duct from the supercharger.

Installation Procedure

    Object Number: 1685836 Size: SH
  1. Install the rear section of the supercharger inlet duct assembly to the supercharger.

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Tighten the rear screw clamps on the inlet duct seal.

    3. Tighten
    Tighten the supercharger inlet seal screw clamps to 2.5 N·m (20 lb in).


    Object Number: 1685842 Size: SH
  3. Install the supercharger. Refer to Supercharger Replacement .
  4. Install the hood assembly. Refer to Hood Replacement .

    5. Object Number: 1685839 Size: SH
  5. Install the front section of the supercharger inlet duct to the vehicle.
  6. Tighten the inlet duct screw clamps (2).

    7. Tighten
    Tighten the supercharger inlet seal screw clamps to 2.5 N·m (20 lb in).

  7. Install the ball studs (1) that retain the inlet duct to the supercharger. There are a total of 6 ball studs.

    8. Tighten
    Tighten the supercharger inlet duct ball studs to 10 N·m (89 lb in).


    Object Number: 1685833 Size: SH
  8. Connect the (PCV) hose fitting (1) to the underside of the inlet duct assembly.

    9. Object Number: 1685817 Size: SH
  9. Install the air cleaner outlet duct (1). Refer to Air Cleaner Outlet Duct Replacement .
  10. Install the engine sight shield. Refer to Intake Manifold Sight Shield Replacement .