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Home >> Buick >> 2004 >> Century Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Engine Mechanical - 3.8L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Intake Manifold Replacement - Lower (L36) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  1. If removed, install the ECT sensor.

    Tighten:  Tighten the sensor to 25 N.m (18 lb ft).

    2. Fig 1: Water Outlet Housing, Bolt & Stud
    GM406012Courtesy of GENERAL MOTORS CORP.
  2. If removed, install the thermostat, the gasket, and the water outlet housing.
  3. Install the water outlet housing bolt and the stud.

    Tighten:  Tighten the bolt and the stud to 27 N.m (20 lb ft).

    4. Fig 2: Lower Intake Manifold Gaskets
    GM153574Courtesy of GENERAL MOTORS CORP.
  4. Install the lower intake manifold gaskets.
    5. Fig 3: Lower Intake Manifold Seals
    GM153573Courtesy of GENERAL MOTORS CORP.
  5. Apply sealer GM P/N 12346286 (Canadian P/N 10953472) or equivalent to the ends of the intake manifold seals.
  6. Install the lower intake manifold seals.
    7. Fig 4: Lower Intake Manifold & Bolts
    GM190545Courtesy of GENERAL MOTORS CORP.
    NOTE: The two bolts which fasten the lower intake manifold to the cylinder head are accessible only after the upper intake is removed. The bolts are located in the right front and left rear corners of the lower intake manifold. Remove the upper intake manifold to service the lower intake.
  7. Install the lower intake manifold.
    8. Fig 5: Lower Intake Manifold Bolts
    GM44774Courtesy of GENERAL MOTORS CORP.
  8. Install the lower intake manifold bolts (1-12). Apply thread lock compound GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the two hidden bolts and ensure they are installed.

    Tighten:  Tighten the lower intake manifold bolts in sequence to 15 N.m (11 lb ft).

    9. Fig 6: Generator Brace Bracket & Bolts
    GM371022Courtesy of GENERAL MOTORS CORP.
  9. Install the generator brace bracket.
  10. Install the generator brace bracket bolts.

    Tighten:  Tighten the bolts to 50 N.m (37 lb ft).

    11. Fig 7: ECT Sensor Electrical Connector
    GM406011Courtesy of GENERAL MOTORS CORP.
  11. Connect the ECT sensor electrical connector.
    12. Fig 8: Radiator Inlet Hose
    GM405984Courtesy of GENERAL MOTORS CORP.
  12. Install the radiator inlet hose to the water outlet housing. Refer to Radiator Hose Replacement - Inlet (3.1L) or Radiator Hose Replacement - Inlet (3.8L) in Engine Cooling.
    13. Fig 9: EGR Outlet Pipe & Bolt
    GM190556Courtesy of GENERAL MOTORS CORP.
  13. Install the EGR outlet pipe to the lower intake manifold.
  14. Install the EGR outlet pipe bolt to the lower intake manifold.

    Tighten:  Tighten the bolt to 29 N.m (21 lb ft).

    15. Fig 10: View Of Drive Belt Tensioner
    GM326960Courtesy of GENERAL MOTORS CORP.
  15. Install the drive belt tensioner. Refer to Drive Belt Tensioner Replacement .
  16. Install the generator brace. Refer to Generator Brace Replacement (L36) or Generator Brace Replacement (L67) in Engine Electrical.
  17. Install the upper intake manifold. Refer to Intake Manifold Replacement - Upper .
    18. Fig 11: View Of EVAP Canister Purge Valve (L36)
    GM217748Courtesy of GENERAL MOTORS CORP.
  18. Install the evaporative emissions (EVAP) canister purge solenoid.
  19. Inspect for fluid or vacuum leaks.
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