Astro, Safari 1997-2005

Oil Pump

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Overhaul




CAUTION
Wear safety glasses in order to avoid eye damage.

  1. Clean the oil pump components in cleaning solvent.
  2.  
  3. Dry the components with compressed air.
  4.  
  5. Inspect the oil pump for the following conditions:
    1. Scoring on the top of gears (1)
    2.  
    3. Damaged gears (2) for chipping, galling or wear.
    4.  
    5. Scoring, damage or casting imperfections to the body (3)
    6.  
    7. Damaged or scored gear shafts (4) or (5)
    8.  
    9. Damaged bolt hole threads
    10.  
    11. Worn oil pump drive shaft bore
    12.  
    13. Damaged or sticking oil pump pressure relief valve. Minor imperfections may be removed with a fine oil stone.
    14.  
    15. Collapsed or broken oil pump pressure relief valve spring

      Click image to see an enlarged view

      Fig. Oil pump exploded view-4.3L engine

    16.  

  6.  
  7. If the oil pump is to be reused, install a NEW oil pump pressure relief valve spring.
  8.  
  9. During oil pump installation, install a NEW oil pump drive shaft retainer.
  10.  

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove oil pan.
  4.  
  5. Remove oil pump bolt, if necessary.
  6.  
  7. Remove oil pump and the pickup tube/shaft, if equipped.
    NOTE
    Be careful not to crack the retainer.



    Click image to see an enlarged view