Nissan Frontier, Xterra 1998-05

Oil Pump

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Inspection



3.3L Engine
  1. Remove the oil pump from the engine.
  2.  
  3. Disassemble the oil pump.
  4.  
  5. Measure the oil pump clearance using a feeler gauge.
  6.  
  7. The oil pump housing to outer rotor radial clearance (1) should be 0.0045-0.0079 inch.
  8.  
  9. The inner rotor to outer rotor tip clearance (1) should be less than 0.0071 inch.
  10.  
  11. The oil pump housing to inner rotor axial clearance (3) should be 0.0020-0.0035 inch.
  12.  
  13. The oil pump housing to outer rotor axial clearance (4) should be 0.0020-0.0043 inch.
  14.  
  15. The inner rotor brazed portion to housing clearance (5) should be 0.0018-0.0036 inch.

    Click image to see an enlarged view

    Fig. Oil pump clearance measurement (part one)-3.3L engine



    Click image to see an enlarged view

    Fig. Oil pump clearance measurement (part two)-3.3L engine

  16.  
  17. If the tip clearance (2) exceeds the limit, replace the rotor set.
  18.  
  19. If the body to rotor clearances (1, 3, 4, 5) exceed specification, replace the oil pump assembly.
  20.  

4.0L Engine
  1. Remove the oil pump from the engine.
  2.  
  3. Remove the oil pump cover.
  4.  
  5. Remove the inner and outer rotors from the oil pump body.
  6.  
  7. Remove the regulator plug, regulator spring and regulator valve.
  8.  
  9. Measure the oil pump clearance using a feeler gauge. Body to outer rotor (position 1) should be 0.0047-0.0077 inch. Inner rotor to outer rotor (position 2) should be 0.0024-0.0063 inch.

    Click image to see an enlarged view

    Fig. Oil pump clearance measurement-4.0L engine

  10.  
  11. Measure the clearance using a feeler gauge. Side clearance between the inner rotor and the pump body (position 3) should be 0.0012-0.0028 inch. Side clearance between the outer rotor and the pump body (position 4) should be 0.0020-0.0035 inch.

    Click image to see an enlarged view

    Fig. Oil pump side clearance measurement-4.0L engine

  12.  
  13. Calculate the clearance between the inner rotor and the oil pump body as follows.
  14.  
  15. Measure the inner diameter of the oil pump body with an inside micrometer (position 5). Measure the outer diameter of the oil pump inner rotor with a micrometer (position 6).
  16.  
  17. Calculate the oil pump inner rotor to oil pump body clearance using the following formula. Clearance=Inner diameter of oil pump body-Outer diameter of inner rotor. Inner rotor to brazed portion of housing clearance specification is 0.0018-0.0036 inch. If not within specification, replace the oil pump.

    Click image to see an enlarged view

    Fig. Oil pump inner rotor and pump body clearance measurement-4.0L engine

  18.  
  19. Check the regulator valve to oil pump cover clearance using the following formula. Clearance=(valve hole diameter)- (outer diameter of valve). Regulator valve to oil pump specification should be 0.0010-0.0028 inch.
    NOTE
    Coat the valve with clean engine oil. Check that it falls smoothly into the regulator valve hole by its own weight.



    Click image to see an enlarged view

    Fig. Oil pump regulator valve clearance measurement-4.0L engine

  20.  
  21. Assemble the oil pump in the reverse order.
  22.  
  23. Install the inner and outer rotor with the punched marks on the oil pump cover side.
  24.  

Removal & Installation





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Fig. Oil pump and related components-2.5L engine

2.4L Engine


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Fig. Align the punch mark with the oil hole before oil pump installation-2.4L engine



Click image to see an enlarged view

Fig. Exploded view of oil pump assembly-2.4L engine

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Set the engine to Top Dead Center (TDC) of the compression stroke for the No. 1 cylinder.
  4.  
  5. Remove or disconnect the following:

    Distributor cap
     
    Distributor
     
    Engine under cover
     
    Stabilizer bar
     
    Oil pump and drive spindle
     

  6.  

To install:

  1. Fill the pump housing with engine oil, then align the punch mark on the spindle with the hole in the oil pump as shown.
  2.  
  3. Install or connect the following:

    Oil pump and drive spindle. Tighten the mounting bolts to 96-132 inch lbs. (11-15 Nm).
     
    Stabilizer bar
     
    Engine under cover
     
    Distributor
     
    Distributor cap
     

  4.  
  5. Start the engine and check for leaks.
  6.  
  7. Check the ignition timing and adjust, as necessary.
  8.  



Click image to see an enlarged view

Fig. Align the punch mark with the oil hole before oil pump installation-2.4L engine



Click image to see an enlarged view

Fig. Exploded view of oil pump assembly-2.4L engine

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Set the engine to Top Dead Center (TDC) of the compression stroke for the No. 1 cylinder.
  4.  
  5. Remove or disconnect the following:

    Distributor cap
     
    Distributor
     
    Engine under cover
     
    Stabilizer bar
     
    Oil pump and drive spindle
     

  6.  

To install:

  1. Fill the pump housing with engine oil, then align the punch mark on the spindle with the hole in the oil pump as shown.
  2.  
  3. Install or connect the following:

    Oil pump and drive spindle. Tighten the mounting bolts to 96-132 inch lbs. (11-15 Nm).
     
    Stabilizer bar
     
    Engine under cover
     
    Distributor
     
    Distributor cap
     

  4.  
  5. Start the engine and check for leaks.
  6.  
  7. Check the ignition timing and adjust, as necessary.
  8.  



Click image to see an enlarged view

Fig. Align the punch mark with the oil hole before oil pump installation-2.4L engine



Click image to see an enlarged view

Fig. Exploded view of oil pump assembly-2.4L engine

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Set the engine to Top Dead Center (TDC) of the compression stroke for the No. 1 cylinder.
  4.  
  5. Remove or disconnect the following:

    Distributor cap
     
    Distributor
     
    Engine under cover
     
    Stabilizer bar
     
    Oil pump and drive spindle
     

  6.  

To install:

  1. Fill the pump housing with engine oil, then align the punch mark on the spindle with the hole in the oil pump as shown.
  2.  
  3. Install or connect the following:

    Oil pump and drive spindle. Tighten the mounting bolts to 96-132 inch lbs. (11-15 Nm).
     
    Stabilizer bar
     
    Engine under cover
     
    Distributor
     
    Distributor cap
     

  4.  
  5. Start the engine and check for leaks.
  6.  
  7. Check the ignition timing and adjust, as necessary.
  8.  



Click image to see an enlarged view

Fig. Align the punch mark with the oil hole before oil pump installation-2.4L engine



Click image to see an enlarged view

Fig. Oil pump exploded view-2.4L engine

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Set the engine to Top Dead Center (TDC) of the compression stroke for the No. 1 cylinder.
  4.  
  5. Remove or disconnect the following:

    Distributor cap
     
    Distributor
     
    Engine under cover
     
    Stabilizer bar
     
    Oil pump and drive spindle
     

  6.  

To install:

  1. Fill the pump housing with engine oil, then align the punch mark on the spindle with the hole in the oil pump as shown.
  2.  
  3. Install or connect the following:

    Oil pump and drive spindle. Tighten the mounting bolts to 96-132 inch lbs. (11-15 Nm).
     
    Stabilizer bar
     
    Engine under cover
     
    Distributor
     
    Distributor cap
     

  4.  
  5. Start the engine and check for leaks.
  6.  
  7. Check the ignition timing and adjust, as necessary.
  8.  

4.0L Engine


Click image to see an enlarged view

Fig. Oil pump and related components-4.0L engine

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable. Drain the engine oil. Drain the engine coolant.
  4.  
  5. Remove the lower oil pan.
  6.  
  7. Remove the upper oil pan.
  8.  
  9. Remove the front timing chain case and timing chain (primary).
  10.  
  11. Remove the oil pump from the engine
  12.  

To install:

  1. Installation is the reverse of the removal procedure.
    NOTE
    Wait 30 minutes after installation of the oil pan to allow the sealant to cure before adding oil.

  2.  
  3. Fill the crankcase to the correct level.
  4.  
  5. Start the engine and check for leaks.
  6.  

 
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