Montana, Silhouette, Venture 2000-2005

Oil Pump

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Inspection



  1. Clean all parts of sludge, oil, and varnish by soaking in cleaning solvent.
  2.  
  3. Inspect for foreign material and determine the source of the foreign material.
  4.  
  5. Inspect the pump housing and cover for cracks, scoring or damaged threads.
  6.  
  7. Do not attempt to repair the pump housing. Replace the pump housing.
  8.  
  9. Inspect the oil pump gears for scoring or excessive wear.
  10.  
  11. Inspect the idler shaft for looseness or scoring. If loose or damaged, replace the oil pump.
  12.  
  13. Inspect the drive gear shaft for looseness or scoring.
  14.  
  15. Inspect the pressure regulator valve for scoring or sticking burrs.
  16.  
  17. Inspect the pressure regulator valve spring for loss of tension or bending.
  18.  
  19. Inspect the suction pipe and screen assembly for looseness, broken wire mesh or screen.
  20.  
  21. Measure the oil pump gear lash. Install the gears, and measure in several places. If lash is more than 0.0037-0.0077 in. (0.094-0.195mm), replace the pump.
  22.  
  23. Measure the oil pump housing gear pocket. If depth is more than 1.202-1.204 in (30.53-30.59mm), or diameter is more than 1.503-1.505 in. (38.176-38.226mm), replace the pump.
  24.  
  25. Measure the oil pump gear diameter. If diameter is more than 1.498-1.500 in (38.05-38.10mm), replace the pump.
  26.  

Overhaul



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

    Cracks or casting imperfections
     
    Scoring
     
    Damaged threads
     

  6.  
  7. Do not attempt to repair the pump housing. Replace the pump housing.
  8.  
  9. Inspect the oil pump gears for the following conditions:

    Scoring
     
    Excessive wear
     

  10.  
  11. Inspect the idler shaft for looseness or scoring. If loose or damaged, replace the oil pump.
  12.  
  13. Inspect the drive gear shaft for looseness or scoring.
  14.  
  15. Inspect the pressure regulator valve for the following conditions:

    Scoring
     
    Sticking Burrs may be removed using a fine oil stone
     

  16.  
  17. Inspect the pressure regulator valve spring for the following conditions:

    Loss of tension
     
    Bending
     

  18.  
  19. Inspect the suction pipe and screen assembly for the following conditions:

    Looseness If the suction pipe is loose, bent or has been removed, replace the pump body cover and suction pipe.
     
    Broken wire mesh or screen
     

  20.  
  21. Measure the oil pump gear lash. Install the gears, and measure in several places.
  22.  
  23. Measure the oil pump housing gear pocket.
  24.  
  25. Measure the oil pump gears .
    NOTE
    When deciding pump serviceability based on end clearance, consider depth of the wear pattern in the pump cover.

  26.  
  27. Measure the oil pump gear side clearance.
  28.  

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Drain the engine oil
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Oil pan
     
    Bolt attaching the oil pump to the rear crankshaft bearing cap
     
    Oil pump and driveshaft
     

  6.  

To install:



Oil pump and driveshaft
 
Oil pump to the rear crankshaft bearing cap. Torque the bolt to 30 ft. lbs. (41 Nm).
 
Oil pan
 
Negative battery cable
 

  1. Fill the engine with oil.
  2.  
  3. Start the vehicle and inspect for leaks, repair if necessary.

    Click image to see an enlarged view

    Fig. Exploded view of the oil pump mounting

  4.  

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Drain the engine oil.
  4.  
  5. Remove the oil pan and gasket. For additional information, refer to the following section, -Oil Pan, Removal & Installation.-

    Click image to see an enlarged view

    Fig. Showing oil pump mounting location

  6.  
  7. Remove the oil pump bolt.
  8.  
  9. Remove the oil pump and oil pump drive shaft.
  10.  

To install:


CAUTION
Do not reuse the oil pump driveshaft retainer. During assembly, install a NEW oil pump driveshaft retainer.

  1. Install the oil pump.
  2.  
  3. Position the oil pump onto the pins.
  4.  
  5. Install the oil pump bolt attaching the oil pump to the rear crankshaft bearing cap. Tighten the oil pump bolt to 30 ft. lbs. (41 Nm).
  6.  
  7. Install the oil pan gasket and oil pan.
  8.  
  9. Refill the engine with oil to the correct level.
  10.  
  11. Start the engine and check for leaks.
  12.  

 
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