Liberty, Wrangler, 1997-2005

Oil Pump

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Removal & Installation



2.4L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative cable from battery.
  4.  
  5. Remove the timing belt.
  6.  
  7. Remove the timing belt rear cover.
  8.  
  9. Remove the oil pan.
  10.  
  11. Remove the crankshaft sprocket using Special Tools 6793 and C-4685-C2, or equivalent.
  12.  
  13. Remove the crankshaft key.
  14.  
  15. Remove the oil pick-up tube.
  16.  
  17. Remove the oil pump and front crankshaft seal.

    Click image to see an enlarged view

    Fig. Crankshaft sprocket removal-2.4L engines



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    Fig. Oil pump-2.4L engines



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    Fig. Oil pump parts-2.4L engines



    Click image to see an enlarged view

    Fig. Checking the oil pump body for flatness-2.4L engines

  18.  

To install:

Click image to see an enlarged view

Fig. Oil pump sealing-2.4L engines

  1. Make sure all surfaces are clean and free of oil and dirt.
  2.  
  3. Apply Mopar® Gasket Maker, or equivalent, to the oil pump as shown. Install the O-ring into the oil pump body discharge passage.
  4.  
  5. Prime the oil pump with engine oil before installation.
  6.  
  7. Align the oil pump rotor flats with the flats on the crankshaft. Install the oil pump to the block.
    NOTE
    To align, the front crankshaft seal MUST be out of the pump, or damage may result.

  8.  
  9. Install a new front crankshaft seal.
  10.  
  11. Install the crankshaft key.
    NOTE
    The crankshaft sprocket is set to a predetermined depth from the factory for correct timing belt tracking. If removed, use of Special Tool 6792, or equivalent, is required to set the sprocket to original installation depth. An incorrectly installed sprocket will result in timing belt and engine damage.

  12.  
  13. Install the crankshaft sprocket using Special Tool 6792.
  14.  
  15. Install the oil pump pick-up tube.
  16.  
  17. Install the oil pan.
  18.  
  19. Install the timing belt rear cover.
  20.  
  21. Install the timing belt.
  22.  

2.5L And 4.0L Engines

WARNING
Before servicing the vehicle, refer to the Precautions section.


NOTE
A gear-type oil pump is mounted at the underside of the cylinder block opposite the No.4 main bearing. The pump incorporates a nonadjustable pressure relief valve to limit maximum pressure to 75 psi (517 kPa) In the relief position, the valve permits oil to bypass through a passage in the pump body to the inlet side of the pump. Oil pump removal or replacement will not affect the distributor timing because the distributor drive gear remains in mesh with the camshaft gear.

  1. Drain the engine oil.
  2.  
  3. Remove or disconnect the following:
    NOTE
    If the oil pump is not to be serviced, do not disturb the position of the oil inlet tube and strainer assembly in the pump body. If the tube is moved within the pump body, a replacement tube and strainer assembly must be installed to assure an airtight seal.



    Negative battery cable
     
    Oil pan
     
    Oil pump and pickup tube
     

  4.  

To install:

Click image to see an enlarged view

Fig. Exploded view of the oil pump assembly-2.5L and 4.0L engine

  1. Install or connect the following:

    Oil pump. Torque the mounting bolts to 17 ft. lbs. (23 Nm).
     
    Oil pan
     
    Negative battery cable
     

  2.  
  3. Fill the engine with the proper type and quantity of oil.
  4.  
  5. Start the engine, check for leaks and repair if necessary.
  6.  

2.8L Diesel Engine


Click image to see an enlarged view

Fig. The oil pump location for the 2.8L Diesel engine

  1. Disconnect negative battery cable.
  2.  
  3. Remove cooling fan and fan drive viscous clutch assembly.
  4.  
  5. Remove accessory drive belt.
  6.  
  7. Remove cooling fan support.
  8.  
  9. Remove vibration damper.
  10.  
  11. Remove the power steering pump pulley.
  12.  
  13. Remove timing belt outer cover.
    NOTE
    The crankshaft must be rotated to 90 degrees ATDC and special tool VM.1089 installed.

  14.  
  15. Remove timing belt.
  16.  
  17. Remove timing belt inner cover.
  18.  
  19. Remove front engine cover.
  20.  
  21. Remove crankshaft sprocket.
  22.  
  23. Remove oil pump retaining bolts and remove pump from engine block.
  24.  

To install:

  1. Lubricate oil pump rotor with engine oil.
  2.  
  3. Install oil pump in bore in engine block.
  4.  
  5. Install oil pump retaining bolts. Torque bolts to 96 inch lbs. (10.8 Nm.).
  6.  
  7. Install crankshaft sprocket. Torque bolts to inch lbs. (10.8 Nm.).
  8.  
  9. Install front engine cover and seal.
  10.  
  11. Install timing belt inner cover.
  12.  
  13. Install the lower timing belt gear and hand tighten fastener.
  14.  
  15. Connect special tool #6958 to the lower timing gear using the vibration damper bolts and tighten the timing gear fastener to 203 ft. lbs. (275 Nm).
  16.  
  17. Remove special tool #6958.
  18.  
  19. Install timing belt.
  20.  
  21. Install timing belt outer cover.
  22.  
  23. Install vibration damper.
  24.  
  25. Install power steering pump pulley.
  26.  
  27. Install cooling fan support.
  28.  
  29. Install accessory drive belt.
  30.  
  31. Install cooling fan and fan drive viscous clutch assembly.
  32.  
  33. Remove the crankshaft and camshaft alignment pins.
  34.  
  35. Connect negative battery cable.
  36.  

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 engine

  6.  

 
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