Bonneville, LeSabre, Park Avenue 2000-2005

Oil Pump

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Removal & Installation



3.8L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Support the engine using an engine support fixture.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Engine drive belts and tensioner assembly
     
    Drive belt idler pulley and bracket
     

  6.  
  7. Remove or disconnect the following:

    Torque axis mount bracket, if necessary
     
    Engine front cover assembly
     
    Oil filter adapter with pressure regulator valve and spring
     
    Oil pump cover
     
    Inner and outer pump gears

    Click image to see an enlarged view

    Fig. The oil pump is located inside the front engine cover-3.8L (VIN K and 1) engines

     

  8.  

To install:

  1. Lubricate the oil pump gears with petroleum jelly.
  2.  
  3. Install the gears into the oil pump housing.
  4.  
  5. Pack the gear cavity with petroleum jelly after the gears have been installed in the housing.
  6.  
  7. Install or connect the following:

    Oil pump cover. Torque the screws to 97 inch lbs. (11 Nm).
     
    Oil filter adapter with new gasket, pressure regulator valve and spring. Torque the bolts to 11 ft. lbs. (15 Nm).
     
    Front cover assembly
     
    Tensioner assembly
     
    Drive belt idler pulley and bracket, if removed
     
    Drive belts
     
    Torque axis mount bracket
     
    Negative battery cable
     

  8.  
  9. Remove the engine support fixture.
  10.  
  11. Verify the correct engine oil level.
  12.  
  13. Start the vehicle and verify no leaks and proper oil pressure.
  14.  

4.6L Engine
  1. Remove the engine front cover.
  2.  
  3. Remove the 3 oil pump assembly retaining bolts identified by the larger head size.
  4.  
  5. Slide the oil pump assembly off the nose of the crankshaft with the drive collar in place.
  6.  
  7. Clean and inspect the oil pump.

    Click image to see an enlarged view

    Fig. Oil pump installation-4.6L engine

  8.  

To install

  1. Install the oil pump drive spacer into the oil pump so that the drive flat engages the pump rotor.
  2.  
  3. Position the oil pump on the crankshaft.
  4.  
  5. Install the retaining bolts.
  6.  
  7. Apply upward pressure on the pump while tightening the 3 retaining bolts. Tighten the bolts in the sequence shown.
    1. First Pass: Tighten the oil pump mounting bolts in sequence to 89 inch lbs. (10 Nm).
    2.  
    3. Final Pass: Tighten the oil pump mounting bolts in sequence an additional 35 degrees.
    4.  

  8.  
  9. Install the engine front cover.
  10.  

 
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