G6 2005-2007

Oil Pump

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Inspection



2.4L Engine
  1. Disassemble the pressure relief valve.
  2.  
  3. Remove the oil pump gerotor cover and bolts.
  4.  
  5. Clean all of the parts in cleaning solvent. Remove varnish, sludge and dirt.
  6.  
  7. Inspect the oil pump for wear and scoring.
  8.  
  9. Replace the front cover and oil pump assembly if it is out of specification or damaged.
  10.  

3.5L & 3.9L Engines
  1. Clean all parts of sludge, oil, and varnish by soaking in cleaning solvent.
  2.  
  3. Inspect for foreign material and determine the source of the foreign material.
  4.  
  5. Inspect the pump housing and cover for cracks, scoring or damaged threads.
  6.  
  7. Do not attempt to repair the pump housing. Replace the pump housing.
  8.  
  9. Inspect the oil pump gears for scoring or excessive wear.
  10.  
  11. Inspect the idler shaft for looseness or scoring. If loose or damaged, replace the oil pump.
  12.  
  13. Inspect the drive gear shaft for looseness or scoring.
  14.  
  15. Inspect the pressure regulator valve for scoring or sticking burrs.
  16.  
  17. Inspect the pressure regulator valve spring for loss of tension or bending.
  18.  
  19. Inspect the suction pipe and screen assembly for looseness, broken wire mesh or screen.
  20.  
  21. Measure the oil pump gear lash. Install the gears, and measure in several places. If lash is more than 0.0037-0.0077 in. (0.094-0.195mm), replace the pump.
  22.  
  23. Measure the oil pump housing gear pocket. If depth is more than 1.202-1.204 in (30.53-30.59mm), or diameter is more than 1.503-1.505 in. (38.176-38.226mm), replace the pump.
  24.  
  25. Measure the oil pump gear diameter. If diameter is more than 1.498-1.500 in (38.05-38.10mm), replace the pump.
  26.  

3.6L Engine
  1. Clean the oil pump components with non-corrosive solvent.
  2.  
  3. Dry the oil pump components with compressed air.
  4.  
  5. Inspect the oil pump housing for the following:

    Damage, scoring, or debris on the housing surface for the driven gear (1)
     
    Damage to the oil pump mounting bosses (2)
     
    Damage, scoring, or debris on the housing surface for the drive gear (3)
     
    Damage, scoring, or debris in the oil pump relief valve port (4)
     
    Damage, scoring, or debris in the oil pump intake port (5)
     
    Damage, scoring, or debris in the oil pump relief valve bore (6)
     
    Damage, scoring, or debris in the oil pump output port (7)
     
    Damage to the threads in the oil pump housing for the oil pump cover bolts (8)

    Click image to see an enlarged view

    Fig. Oil pump housing-3.6L engine

     

  6.  
  7. Inspect the oil pump cover for the following conditions:

    Damage to the oil pump cover mounting bosses
     
    Damage, scoring, or debris in the oil pump cover oil passages
     
    Damage to the sealing surface between the oil pump cover and the oil pump housing
     

  8.  
  9. Inspect the inner drive gear for damage. If inner diameter damage is found, ensure the crankshaft is also inspected.
  10.  
  11. Inspect the outer driven gear for damage.
  12.  
  13. Inspect the oil pump relief valve components for debris or damage.
  14.  
  15. Inspect the primary camshaft drive chain lower guide for damage 
  16.  
  17. If debris or damage is present within the oil pump, further inspection of all of the engine components is necessary.
  18.  

Removal & Installation



2.4L Engine

NOTE
The oil pump is mounted into the engine front cover.

  1. Relieve the fuel system pressure.
  2.  
  3. Drain the engine oil.
  4.  
  5. Remove the engine front cover.
  6.  
  7. Remove the oil pump cover.
  8.  
  9. Remove the oil pump from the inside of the front cover.
  10.  

To install:

  1. Coat the oil pump gears with oil and fit the pump to the cover.
  2.  
  3. Install the oil pump cover.
  4.  
  5. Install the engine front cover.
  6.  
  7. Fill the engine with clean oil.
  8.  
  9. Start the vehicle, check for leaks and repair if necessary.
  10.  

3.5L & 3.9L Engines
  1. Remove the oil pan.
  2.  
  3. Remove the oil pump bolt.
  4.  
  5. Remove the oil pump and the oil pump drive shaft.
  6.  

To install:

  1. Install the oil pump drive shaft and the oil pump.
  2.  
  3. Install the oil pump bolt and tighten to 30 ft. lbs. (40 Nm).
  4.  
  5. Install the oil pan.
  6.  
  7. Fill the engine with clean oil.
  8.  
  9. Start the vehicle, check for leaks and repair if necessary.
  10.  

3.6L Engine
  1. Remove the primary timing chain.
  2.  
  3. Remove the oil pump bolts and the oil pump.
  4.  

To install:

Click image to see an enlarged view

Fig. Oil pump mounting view-3.6L engine

  1. Align the oil pump generator with the crankshaft flats and install the oil pump to the engine block.
  2.  
  3. Align the pump body with the mounting holes in the cylinder block.
  4.  
  5. Install the oil pump bolts and tighten to 17 ft. lbs. (23 Nm).
  6.  
  7. Install the primary timing chain.
  8.  

 
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