Isuzu I-280, I-350 2005-06

Oil Pump

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Inspection



  1. Clean all parts of sludge, oil, and varnish by soaking in carburetor cleaner or cleaning solvent.
  2.  
  3. Inspect for foreign material and determine the source of the foreign material.
  4.  
  5. Inspect the oil pump housing and engine front cover for the following:

    Cracks or casting imperfections
     
    Scoring
     
    Damaged threads
     

  6.  
  7. Do not attempt to repair the oil pump housing. Replace the oil pump housing if damage is found.
  8.  
  9. Inspect the oil pump gears for damage.
  10.  
  11. Measure the inner oil pump gear tip clearance in several places.

    Click image to see an enlarged view

    Fig. Measuring inner oil pump gear tip clearance

  12.  
  13. Measure the outer oil pump gear tip clearance in several places.
    NOTE
    When deciding oil pump serviceability based on end clearance, consider depth of the wear pattern in the pump cover.



    Click image to see an enlarged view

    Fig. Measuring outer oil pump gear tip clearance

  14.  
  15. Measure the oil pump gear side clearance.
  16.  
  17. Inspect the pressure regulator valve for the following conditions:

    Scoring
     
    Sticking
     
    Burrs-Burrs may be removed using a fine oil stone
     

  18.  
  19. Inspect the pressure regulator valve spring for loss of tension or bending. Replace the pressure regulator spring if damaged.
  20.  
  21. Inspect the oil pump pipe pickup tube and screen assembly for the following conditions:

    Looseness-If the oil pump pickup tube is loose or bent, replace the oil pump pipe pickup tube.
     
    Broken wire mesh or screen.
     
    Inspect the O-ring seal at the base of the oil pump pickup tube for damage.

    Click image to see an enlarged view

    Fig. Inspecting oil pump pipe pickup tube and screen assembly

     

  22.  

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove or disconnect the following:

    Engine front cover
     
    Oil pump cover bolts
     
    Oil pump cover
     

  4.  
  5. Matchmark the inner and outer gears in relation to the oil pump housing.
  6.  
  7. Remove or disconnect the following:

    Inner and outer oil pump gears
     
    Oil pump pressure relief valve plug
     
    Oil pump pressure relief valve and spring

    Click image to see an enlarged view

    Fig. Exploded view of the oil pump and related components-2.8L and 3.5L engines

     

  8.  
  9. Position the Special Tool J-38185 to the clamp (3) in order to remove the radiator inlet hose (2) from the thermostat housing (4).
  10.  

To install:

  1. Install or connect the following:

    Oil pump pressure relief valve and spring
     
    Oil pump pressure relief valve plug and tighten to 124 inch lbs. (14 Nm)
     
    Oil pump outer and inner gears
     
    Oil pump cover and tighten the bolts to 89 inch lbs. (10 Nm).
     
    Engine front cover
     

  2.  
  3. Start the engine and check for leaks.
  4.  

 
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