Cobalt 2006-2008, G5 2007

Oil Pump

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Inspection



  1. Check the oil pump case for worn shaft hole, clogged oil passage, worn rotor chamber, cracks, and other faults.
  2.  
  3. Check the oil seal lips for deformation, hardening, or wear. Replace if defective.
  4.  
  5. Inspect for foreign material and determine the source of the foreign material.
  6.  
  7. Clean all of the parts in cleaning solvent. Remove varnish, sludge, and dirt.
  8.  
  9. Inspect the oil pump for wear and scoring.
  10.  
  11. Inspect the oil pump housing and engine front cover for scoring, damaged threads, cracks, or casting imperfections.
    NOTE
    Do not attempt to repair the oil pump housing. Replace the oil pump housing if damage is found.

  12.  
  13. Inspect the oil pump gears for damage.
  14.  
  15. Inspect the pressure regulator valve for scoring, sticking, or burrs.
  16.  
  17. Check the valve for fitting condition and damage, and the relief valve spring for damage and deterioration. Replace the parts if defective.
  18.  
  19. Inspect the oil pump pickup tube and screen assembly for looseness, broken screen, or O-ring damage.
  20.  
  21. Replace as necessary.
  22.  

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the timing chain front cover. Refer to Timing Chain Cover and Seal removal and installation.
  4.  
  5. Disassemble the pressure relief valve.
  6.  
  7. Remove the oil pump gerotor cover and bolts.

    Click image to see an enlarged view

    Fig. Exploded view of the disassembled oil pump-2.0L, 2.2L, & 2.4L engines

  8.  

To assemble:

  1. Lubricate all oil pump parts with engine oil.
  2.  
  3. Install the inner gear into the outer gear.
    WARNING
    If gears are improperly installed in the front cover, the gerotor cover will not bolt on.

  4.  
  5. Install the gears together into the front cover with the hub of the center gear facing the front cover.
  6.  
  7. Install the oil pump gerotor cover and bolts. Tighten the oil pump gerotor bolts to 53 inch lbs. (6 Nm).
  8.  
  9. Install the pressure relief valve piston.
  10.  
  11. Install the pressure relief valve spring. Tighten the pressure relief valve plug to 30 ft. lbs. (40 Nm).
  12.  
  13. Install the timing chain front cover. Refer to Timing Chain Cover and Seal removal and installation.
  14.  

 
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