Grand Cherokee 2006-2007

Oil Pump

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Inspection



3.7L & 4.7L Engines

WARNING
Oil pump pressure relief valve and spring should not be removed from the oil pump. If these components are disassembled and or removed from the pump the entire oil pump assembly must be replaced.

  1. Clean all parts thoroughly. Mating surface of the oil pump housing should be smooth. If the pump cover is scratched or grooved the oil pump assembly should be replaced.
  2.  
  3. Lay a straight edge across the pump cover surface. If a 0.001 in. (0.025mm) feeler gauge can be inserted between the cover and the straight edge the oil pump assembly should be replaced.
  4.  
  5. Measure the thickness of the outer rotor. If the outer rotor thickness measures at 0.472 in.(12.005mm) or less the oil pump assembly must be replaced.
  6.  
  7. Measure the diameter of the outer rotor. If the outer rotor diameter measures at 3.382 in. (85.925mm) or less the oil pump assembly must be replaced.
  8.  
  9. Measure the thickness of the inner rotor. If the inner rotor thickness measures at 0.472 in. (12.005mm) or less then the oil pump assembly must be replaced.
  10.  
  11. Slide outer rotor into the body of the oil pump. Press the outer rotor to one side of the oil pump body and measure clearance between the outer rotor and the body. If the measurement is 0.009 in. (0.235mm) or more the oil pump assembly must be replaced.
  12.  
  13. Install the inner rotor in the into the oil pump body. Measure the clearance between the inner and outer rotors. If the clearance between the rotors is 0.006 in. (0.150mm) or more the oil pump assembly must be replaced.
  14.  
  15. Place a straight edge across the body of the oil pump (between the bolt holes); if a feeler gauge of 0.0038 in. (0.095mm) or greater can be inserted between the straightedge and the rotors, the pump must be replaced.
    NOTE
    The oil pump is replaced as an assembly; there are no subassembly components. In the event the oil pump is not functioning or out of specification it must be replaced as an assembly.



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    Fig. Checking oil pump cover plate



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    Fig. Measuring outer rotor thickness



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    Fig. Measuring inner rotor thickness



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    Fig. Measuring clearance between pump housing and outer rotor



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    Fig. Measuring clearance between inner and outer rotor



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    Fig. Measuring clearance between rotors and pump body cover

  16.  

5.7L Engine
  1. Remove the pump cover.
  2.  
  3. Clean all parts thoroughly. Mating surface of the oil pump housing should be smooth. If the pump cover is scratched or grooved the oil pump assembly should be replaced.
  4.  
  5. Slide outer rotor into the body of the oil pump. Press the outer rotor to one side of the oil pump body and measure clearance between the outer rotor and the body. If the measurement is 0.009 in. (0.235mm) or more the oil pump assembly must be replaced.
  6.  
  7. Install the inner rotor in the into the oil pump body. Measure the clearance between the inner and outer rotors. If the clearance between the rotors is 0.006 in. (0.150mm) or more the oil pump assembly must be replaced.
  8.  
  9. Place a straight edge across the body of the oil pump (between the bolt holes); if a feeler gauge of 0.0038 in. (0.095mm) or greater can be inserted between the straightedge and the rotors, the pump must be replaced.
  10.  
  11. Reinstall the pump cover. Torque fasteners to 132 inch lbs. (15 Nm).
    NOTE
    The oil pump is replaced as an assembly. There are no DaimlerChrysler part numbers for sub-assembly components. In the event the oil pump is not functioning or out of specification it must be replaced as an assembly.

  12.  

Removal & Installation



3.7L Engine
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Remove or disconnect the following:

    Oil Pan
     
    Timing chain cover
     
    Timing chains and tensioners
     
    Oil pump
     

  4.  
  5. Installation is the reverse of removal. Torque the pump bolts, in sequence, to 21 ft. lbs. (28 Nm),

    Click image to see an enlarged view

    Fig. Oil pump bolt torque sequence-3.7L

  6.  

4.7L Engine
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Drain the engine oil.
  4.  
  5. Remove or disconnect the following:

    Valve covers
     
    Front cover
     
    Timing chains and sprockets
     
    Oil pan and pickup tube
     
    Oil pump and primary timing chain tensioner
     

  6.  

To install:

  1. Install or connect the following:

    Oil pump and primary timing chain tensioner. Torque the bolts in sequence to 21 ft. lbs. (28 Nm).
     
    Oil pan and pickup tube
     
    Timing chains and sprockets
     
    Front cover
     
    Valve covers
     

  2.  
  3. Fill the engine with clean oil.
  4.  
  5. Start the engine, check for leaks and repair if necessary.

    Click image to see an enlarged view

    Fig. Oil pump and chain tensioner torque sequence-4.7L engine

  6.  

5.7L Engines
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Remove the oil pan and pick-up tube.
  4.  
  5. Remove the timing chain cover.
  6.  
  7. Remove the four bolts, and the oil pump.
    WARNING
    Oil pump pressure relief valve and spring should not be removed from the oil pump. If these components are disassembled and or removed from the pump the entire oil pump assembly must be replaced.

  8.  

To install:

  1. Position the oil pump onto the crankshaft and install the 4 oil pump retaining bolts.
  2.  
  3. Tighten the oil pump retaining bolts to 250 inch lbs. (28 Nm).
  4.  
  5. Install the timing chain cover.
  6.  
  7. Install the pick-up tube and oil pan.
  8.  

 
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