S10 Pickup, Sonoma 2000-2004

Oil Pump

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Overhaul



  1. Clean the oil pump components in cleaning solvent.
  2.  
  3. Dry the components with compressed air.
  4.  
  5. Inspect the oil pump for the following conditions:

    Scoring on the top of the gears
     
    Chipping, galling or wear of the gears
     
    Scoring, damage or casting imperfections to the body
     
    Damage or scoring of the gear shafts
     
    Damaged bolt hole threads
     
    Worn oil pump driveshaft bore
     
    Damaged or sticking oil pump pressure relief valve. Minor imperfections may be removed with a fine oil stone
     
    Collapsed or broken oil pump pressure relief valve spring
     

  6.  
  7. If the oil pump is to be reused, install a NEW oil pump pressure relief valve spring.
  8.  
  9. During oil pump installation, install a NEW oil pump driveshaft retainer.
  10.  

Removal & Installation



  1. Remove or disconnect the following:
    NOTE
    Be careful not to crack the retainer.



    Oil pan
     
    Oil pump and the pickup tube/shaft, if equipped
     
    Extension shaft and retainer from the pump, if necessary for the 2.2L engine
     



    Click image to see an enlarged view

    Fig. Exploded view of the oil pump mounting-2.2L engine

  2.  
  3. Inspect the pins (oil pump locator) for damage, and replace the pins if required.

    Click image to see an enlarged view

    Fig. On 4.3L engines, inspect the pins (oil pump locator) for damage, and replace the pins if required

  4.  

To install:

  1. For the 2.2L engine, if the extension shaft was removed, heat the extension shaft retainer in hot water, then install the shaft and retainer to the oil pump. Be sure the retainer does not crack during installation.
  2.  
  3. Ensure that the pump pickup tube is tight in the pump body. If the tube should come loose, oil pressure will be lost and oil starvation will occur. If the pickup tube is loose it should be replaced.
  4.  
  5. If the pump has been disassembled and is being replaced or for any reason oil has been removed, it must be primed. It can either be filled with oil before installing the cover plate and oil kept within the pump during handling or the entire pump cavity can be filled with petroleum jelly.
    WARNING
    If the pump is not primed, the engine could be damaged upon start up.


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

  6.  
  7. Install or connect the following:
    NOTE
    If the oil pump does not build up oil pressure almost immediately, remove the pan and check for a loose oil pump-to-pickup tube attachment. If necessary dismantle the pump and pack the pump cavity with petroleum jelly.



    Oil pump. Tighten oil pump/pickup tube retainer(s) to 32 ft. lbs. (44 Nm) for the 2.2L engine or to 65 ft. lbs. (90 Nm), for the 4.3L engine.
     



    Oil pan
     

  8.  
  9. Refill the crankcase.
  10.  
  11. Disable the ignition system; crank engine for approximately 10 seconds to aid in priming the oil pump and reducing the risk of engine damage.
    WARNING
    Running the engine without measurable oil pressure will cause extensive damage.

  12.  

 
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