Pacifica 2006-2008

Oil Pump

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Inspection



3.5L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the oil pump.
  6.  
  7. Disassemble the oil pump. Clean all parts. Replace the pump if the cover is scratched or grooved. The mating surface of the pump housing should be smooth.
  8.  
  9. Lay a straightedge across the pump cover surface. If a 0.001 inch feeler gauge can be inserted between the cover and the straightedge, the cover should be replaced.
  10.  
  11. Measure the thickness and diameter of the outer rotor. If the outer rotor thickness is 0.563 inch or less or if the diameter is 3.141 inch or less, replace the outer rotor.
  12.  
  13. If the inner rotor measures 0.563 inch or less, replace the inner rotor.
  14.  
  15. Slide the outer rotor into the body. Press one side with your fingers and measure the clearance between the rotor and the body. If the measurement is 0.015 inch or more, replace the body.
  16.  
  17. Install the inner rotor into the body. If the clearance between the inner and outer rotors is 0.008 inch or more, replace both rotors.
  18.  
  19. Place a straightedge across the face of the body, between the bolt holes. If a feeler gauge of 0.003 inch or more can be inserted between the rotors and the straightedge, replace the pump assembly ONLY if the rotors are within spec.
  20.  
  21. Inspect the oil pressure relief valve plunger for scoring and free operation in its bore.
    NOTE
    Small marks may be removed with 400 grit wet/dry sandpaper.

  22.  
  23. The spring has a free length of 1.95 inch. It should test between 23-25 lbs when compressed to 1 11/32 inch. Replace the spring, as required.
  24.  
  25. Assemble the pump.
  26.  

3.8L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the oil pump.
  6.  
  7. Disassemble the oil pump. Clean all parts. Replace the pump if the cover is scratched or grooved. The mating surface of the pump housing should be smooth.
  8.  
  9. Lay a straightedge across the pump cover surface. If a 0.001 inch feeler gauge can be inserted between the cover and the straightedge, the cover should be replaced.
  10.  
  11. Measure the thickness and diameter of the outer rotor. If the outer rotor thickness is 0.301 inch or less or if the diameter is 3.148 inch or less, replace the outer rotor.
  12.  
  13. If the inner rotor measures 0.301 inch or less, replace the inner rotor.
  14.  
  15. Install the outer rotor into the chain case cover. Press one side with your fingers and measure the clearance between the rotor and the body. If the measurement is 0.015 inch or more, replace the chain case cover, only if the rotor is out of specification.
  16.  
  17. Install the inner rotor into the chain case cover. If the clearance between the inner and outer rotors is 0.008 inch or more, replace both rotors.
  18.  
  19. Place a straightedge across the face of the chain case cover, between the bolt holes. If a feeler gauge of 0.004 inch or more can be inserted between the rotors and the straightedge, replace the pump assembly ONLY if the rotors are within spec.
  20.  
  21. Inspect the oil pressure relief valve plunger for scoring and free operation in its bore.
    NOTE
    Small marks may be removed with 400 grit wet/dry sandpaper.

  22.  
  23. The spring has a free length of 1.95 inch. It should test between 19.5-20.5 lbs when compressed to 1 11/32 inch. Replace the spring, as required.
  24.  
  25. Assemble the pump.
  26.  

4.0L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the oil pump.
  6.  
  7. Disassemble the oil pump. Clean all parts. Replace the pump if the cover is scratched or grooved. The mating surface of the pump housing should be smooth.
  8.  
  9. Lay a straightedge across the pump cover surface. If a 0.001 inch feeler gauge can be inserted between the cover and the straightedge, the cover should be replaced.
  10.  
  11. Measure the thickness and diameter of the outer rotor. If the outer rotor thickness is 0.563 inch or less or if the diameter is 3.141 inch or less, replace the outer rotor.
  12.  
  13. If the inner rotor measures 0.563 inch or less, replace the inner rotor.
  14.  
  15. Slide the outer rotor into the body. Press one side with your fingers and measure the clearance between the rotor and the body. If the measurement is 0.015 inch or more, replace the body.
  16.  
  17. Install the inner rotor into the body. If the clearance between the inner and outer rotors is 0.008 inch or more, replace both rotors.
  18.  
  19. Place a straightedge across the face of the body, between the bolt holes. If a feeler gauge of 0.003 inch or more can be inserted between the rotors and the straightedge, replace the pump assembly ONLY if the rotors are within spec.
  20.  
  21. Inspect the oil pressure relief valve plunger for scoring and free operation in its bore.
    NOTE
    Small marks may be removed with 400 grit wet/dry sandpaper.

  22.  
  23. The spring has a free length of 1.95 inch. It should test between 23-25 lbs when compressed to 1 11/32 inch. Replace the spring, as required.
  24.  
  25. Assemble the pump.
  26.  

Removal & Installation



3.5L Engine

The timing belt must be removed to access the oil pump located behind the crankshaft drive sprocket. It is good practice to turn the crankshaft to Top Dead Center (TDC) No. 1 cylinder compression stroke (firing position) before starting disassembly. This should align all timing marks and be a good point of reference for all work to follow.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Drain the engine oil.
  4.  
  5. Drain the cooling system.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Timing belt
     
    Crankshaft sprocket using tool L-4407-A
     
    Oil pan
     
    Oil pump pickup tube
     
    Oil pump-to-engine screws and pump
     
    Oil pump rotors
     

  8.  
  9. Wash all parts in solvent and inspect carefully for damage or wear.
  10.  

To install:

Click image to see an enlarged view

Fig. Exploded view of the oil pump assembly-3.5L engine



Click image to see an enlarged view

Fig. Prime the oil pump before installation, because a dry pump will wear prematurely and cause low oil pressure-3.5L engine

  1. Clean all parts well. There should be no traces of old gasket/sealer on any components.
  2.  
  3. Assemble the oil pump with new parts as required.
  4.  
  5. Install the oil pump cover. Torque the fasteners to 108 inch lbs. (12 Nm).
  6.  
  7. Prime the oil pump prior to installation by filling the rotor cavity with clean engine oil.
  8.  
  9. Install the oil pump and tighten the oil pump-to-engine screws to 250 inch lbs. 28 Nm)
  10.  
  11. Install or connect the following:

    Oil pump pickup tube using a new O-ring
     
    Oil pan
     
    Crankshaft sprocket using tool C-4685C1, thrust bearing, washer and 12mm bolt to draw the sprocket onto the crankshaft
     
    Timing belt
     
    Negative battery cable
     

  12.  
  13. Fill and bleed the cooling system.
  14.  
  15. Fill the engine with the correct amount of clean SAE 5W-30 or SAE 10W-30 engine oil only. Do not mix the two grades of oil.
  16.  
  17. Start the engine, check for leaks and proper oil pressure.
  18.  

3.8L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Drain the engine oil.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Oil pan
     
    Timing chain cover
     
    Oil pump from the case cover

    Click image to see an enlarged view

    Fig. Exploded view of the oil pump assembly-3.8L engine

     

  8.  

To install:

  1. Install or connect the following:

    Oil pump to the front cover. Torque the cover screws to 105 inch lbs. (12 Nm).
     
    Front cover. Torque the bolts to 20 ft. lbs. 927 Nm).
     
    Oil pan
     
    Negative battery cable
     

  2.  
  3. Fill the engine with clean oil.
  4.  
  5. Fill the cooling system.
  6.  
  7. Start the engine, check for leaks and repair if necessary.
  8.  

4.0L Engines

The timing belt must be removed to access the oil pump located behind the crankshaft drive sprocket. It is good practice to turn the crankshaft to Top Dead Center (TDC) No. 1 cylinder compression stroke (firing position) before starting disassembly. This should align all timing marks and be a good point of reference for all work to follow.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative battery cable. Drain the engine oil.
  4.  
  5. Drain the cooling system.
  6.  
  7. Raise and support the vehicle safely.
  8.  
  9. Drain the engine oil.
  10.  
  11. Remove or disconnect the following:

    Timing belt
     
    Crankshaft sprocket
     
    Oil pan
     
    Oil pump pickup tube
     
    Oil pump-to-engine screws and pump
     

  12.  

To install:


NOTE
Thoroughly clean all bolt threads and threaded area in the engine, removing all oil residue, before assembly.

  1. Prime the oil pump prior to installation.
  2.  
  3. Install the oil pump and gasket carefully over the crankshaft and position the pump onto the engine block.
    NOTE
    Do not apply the thread sealant to the underside of the bolt head.



    Click image to see an enlarged view

    Fig. Oil pump bolt locations-4.0L engine

  4.  
  5. Apply thread sealant to the oil pump cover bolts. The sealant must be applied from the tip to about 10mm of the thread length.
  6.  
  7. Tighten the pump cover bolts to 105 inch lbs.
  8.  
  9. Tighten the pump to block bolts to 250 inch lbs.
  10.  
  11. Install a new O-ring on the oil pickup tube. Install the pickup tube.
  12.  
  13. Continue the installation in the reverse order of the removal procedure.
  14.  
  15. Fill the cooling system with the proper grade and type coolant.
  16.  
  17. Fill the engine with the proper grade and type engine oil.
  18.  
  19. Start the engine and check for leaks, correct as required.
  20.  

 
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