DeVille, Eldorado, Seville 1999-2005

Oil Pump

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Overhaul




CAUTION
Wear safety glasses in order to avoid eye damage.

  1. Clean the oil pump components with non-corrosive solvent.
  2.  
  3. Dry the oil pump components with compressed air.

    Click image to see an enlarged view

    Fig. Oil pump components. Pump must be replaced if any of these items are damaged.

  4.  
  5. Inspect the housing and the cover for cracks, scoring, casting imperfections and damaged threads.
  6.  
  7. Inspect the gerotor gears for chipping, galling or wear.
  8.  
  9. Inspect the pressure relief valve for embedded particles and/or damage.
    NOTE
    The internal parts of the oil pump are not serviced separately. If wear or damage is noted, replace the entire pump assembly.

  10.  

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Drive belt tensioner
     
    Drive belt idler pulley
     
    Crankshaft balancer
     
    Right engine mount bracket
     
    Engine front cover and gasket. The gasket is reusable. Do not discard unless it is damaged.
     
    3 oil pump assembly retaining bolts identified the bolts by the larger head size
     
    Oil pump assembly off the nose of the crankshaft with the drive collar in place
     

  4.  
  5. Clean and inspect the oil pump.
  6.  

To install:

  1. Install or connect the following:

    Oil pump drive spacer into the oil pump so that the drive flat engages the pump rotor
     
    Oil pump on the crankshaft
     
    Pump retaining bolts and tighten to 89 inch lbs. (10 Nm) plus an additional 35 degrees
     

  2.  
  3. Place a small amount of sealant at the split line of the upper and lower crankcases.
  4.  
  5. Install or connect the following:

    Engine front cover gasket over the crankcase dowel pins
     
    Engine front cover in position on the crankcase
     
    Engine front cover retaining bolts in the sequence illustrated to 89 inch lbs. (10 Nm)
     
    Crankshaft balancer
     
    Engine mount bracket
     
    Drive belt idler pulley and tighten the bolt to 37 ft. lbs. (50 Nm)
     
    Drive belt tensioner
     
    Negative battery cable

    Click image to see an enlarged view

    Fig. Front cover torque sequence

     

  6.  

 
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