ParkAvenue 1997-1999

Oil Pump

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Inspection



Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

The oil pump is responsible for providing constant lubrication to the whole engine and so it is recommended that a new oil pump be installed when rebuilding the engine.

Completely disassemble the oil pump and thoroughly clean all of the components. Inspect the oil pump gears and housing for wear and/or damage. Insure that the pressure relief valve operates properly and there is no binding or sticking due to varnish or debris. If all of the parts are in proper working condition, lubricate the gears and relief valve, and assemble the pump.

Installation



Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

  1. Using petroleum jelly, pack the pump and assemble the gears in the housing.
  2.  
  3. Tighten the oil pump cover-to-front cover screws to 97 inch lbs. (11 Nm).
  4.  
  5. Install the pressure regulator spring and valve. Install the oil filter adapter.
  6.  
  7. Install the front cover to the engine.
  8.  
  9. Connect the negative battery cable.
  10.  

Overhaul



Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

  1. Remove the front cover from the engine.
  2.  
  3. Remove the oil filter adapter, pressure regulator valve and spring.
  4.  
  5. Remove the oil pump cover-to-front cover screws and the cover. Remove the inner and outer pump gears.
  6.  
  7. Clean all parts in a suitable solvent. Remove all varnish, dirt and sludge. Thoroughly clean the gasket mating surfaces.
  8.  
  9. Inspect the pump cover and front cover for cracks, scoring, porous or damaged casting, damaged threads, or excessive wear. Inspect the pressure regulator for scoring, sticking in bore or burrs.
  10.  
  11. Check the oil pump gears for:
    1. Inner gear tip clearance - 0.006 inch (0.152mm)

      Click image to see an enlarged view

      Fig. Use feeler gauges to measure the gear tip clearance

    2.  
    3. Outer gear diameter clearance - 0.008-0.015 inch (0.203-0.381mm)

      Click image to see an enlarged view

      Fig. Measure the outer gear diameter clearance and compare with specifications

    4.  
    5. Gear end clearance (gear drop in housing) - 0.001-0.0035 inch (0.025-0.089mm)

      Click image to see an enlarged view

      Fig. Measure the gear end clearance (gear drop-in housing)

    6.  
    7. Pressure regulator valve-to-bore clearance - 0.0015-0.003 inch (0.0015-0.003mm)
    8.  

  12.  

Precautions



Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999


CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

Removal



Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the front cover from the engine.
  4.  
  5. Remove the oil filter adapter, pressure regulator valve and spring.
  6.  
  7. Remove the oil pump cover-to-front cover screws and the cover. Remove the inner and outer pump gears.
  8.  



Click image to see an enlarged view

Fig. The oil pump assembly is located at the front of the crankshaft

Removal & Installation



Specific to:

Buick Park Avenue 1998-1999

Oldsmobile Regency 1998

  1. Before servicing the vehicle, refer to the precautions in the beginning of this 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 22 ft. lbs. (30 Nm) on 1998-99 models and 11 ft. lbs. (15 Nm) on 2000-02 models.
     
    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.  

 
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