Avalanche, Sierra, Silverado, C&K Series, 1999-2005

Oil Pump 3

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Removal & Installation



8.1L Engine
  1. Remove or disconnect the following:

    Oil pan
     
    Oil pump screen bolt
     
    Oil pump, retainer and driveshaft. Discard the driveshaft retainer
     
    Crankshaft oil deflector nuts
     
    Crankshaft oil deflector
     
    Oil pump bolts
     
    Oil pump
     

  2.  
  3. Clean and inspect the oil pump

    Click image to see an enlarged view

    Fig. Oil pump removal-8.1L engine

  4.  

To install:

  1. Install the crankshaft oil deflector. Tighten the nuts to 37 ft. lbs. (50 Nm).
    NOTE
    Always replace the retainer between the oil pump and the shaft, when installing the oil pump. During assembly, install a new oil pump driveshaft retainer. To ease installation, slightly heat the retainer to above room temperature.

  2.  
  3. Assemble the oil pump, driveshaft and a new retainer.
  4.  
  5. Install or connect the following:

    Oil pump, positioning it on the locating pins
     
    Oil pump bolt and tighten to 56 ft. lbs. (75 Nm)
     
    Oil pan
     

  6.  
  7. Refill the engine crankcase
  8.  
  9. Disable the ignition system; crank engine for approximately 10 seconds to aid in priming the oil pump and reducing the risk of engine damage.
    NOTE
    If the oil pump does not build up oil pressure almost immediately, remove the pan and check for a loose oil pump-to-pick-up tube attachment. If necessary dismantle the pump and pack the pump cavity with petroleum jelly. Running the engine without measurable oil pressure will cause extensive damage.

  10.  

  1. Remove or disconnect the following:

    Oil pan
     
    Oil pump screen bolt
     
    Oil pump, retainer and driveshaft. Discard the driveshaft retainer.
     
    Crankshaft oil deflector nuts
     
    Crankshaft oil deflector
     
    Oil pump bolts
     
    Oil pump
     

  2.  
  3. Clean and inspect the oil pump

    Click image to see an enlarged view

    Fig. Oil pump removal-8.1L engine

  4.  

To install:

  1. Install the crankshaft oil deflector. Tighten the nuts to 37 ft. lbs. (50 Nm).
    NOTE
    Always replace the retainer between the oil pump and the shaft, when installing the oil pump. During assembly, install a new oil pump driveshaft retainer. To ease installation, slightly heat the retainer to above room temperature.

  2.  
  3. Assemble the oil pump, driveshaft and a new retainer.
  4.  
  5. Install or connect the following:

    Oil pump, positioning it on the locating pins
     
    Oil pump bolt and tighten to 56 ft. lbs. (75 Nm)
     
    Oil pan
     

  6.  
  7. Refill the engine crankcase
  8.  
  9. Disable the ignition system; crank engine for approximately 10 seconds to aid in priming the oil pump and reducing the risk of engine damage.
    NOTE
    If the oil pump does not build up oil pressure almost immediately, remove the pan and check for a loose oil pump-to-pick-up tube attachment. If necessary dismantle the pump and pack the pump cavity with petroleum jelly. Running the engine without measurable oil pressure will cause extensive damage.

  10.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Oil pan
     
    Oil pump screen bolt
     
    Oil pump, retainer and driveshaft. Discard the driveshaft retainer
     
    Crankshaft oil deflector nuts
     
    Crankshaft oil deflector
     
    Oil pump bolts
     
    Oil pump
     

  4.  
  5. Clean and inspect the oil pump

    Click image to see an enlarged view

    Fig. Oil pump removal-8.1L engine

  6.  

To install:

  1. Install the crankshaft oil deflector. Tighten the nuts to 37 ft. lbs. (50 Nm)
    NOTE
    Always replace the retainer between the oil pump and the shaft, when installing the oil pump. During assembly, install a new oil pump driveshaft retainer. To ease installation, slightly heat the retainer to above room temperature.

  2.  
  3. Assemble the oil pump, driveshaft and a new retainer.
  4.  
  5. Install or connect the following:

    Oil pump, positioning it on the locating pins
     
    Oil pump bolt and tighten to 56 ft. lbs. (75 Nm)
     
    Oil pan
     

  6.  
  7. Refill the engine crankcase
  8.  
  9. Disable the ignition system; crank engine for approximately 10 seconds to aid in priming the oil pump and reducing the risk of engine damage.
    NOTE
    If the oil pump does not build up oil pressure almost immediately, remove the pan and check for a loose oil pump-to-pick-up tube attachment. If necessary dismantle the pump and pack the pump cavity with petroleum jelly. Running the engine without measurable oil pressure will cause extensive damage.

  10.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Oil pan
     
    Oil pump screen bolt
     
    Oil pump, retainer and driveshaft. Discard the driveshaft retainer
     
    Crankshaft oil deflector nuts
     
    Crankshaft oil deflector
     
    Oil pump bolts
     
    Oil pump
     

  4.  
  5. Clean and inspect the oil pump

    Click image to see an enlarged view

    Fig. Oil pump removal-8.1L engine

  6.  

To install:

  1. Install the crankshaft oil deflector. Tighten the nuts to 37 ft. lbs. (50 Nm)
    NOTE
    Always replace the retainer between the oil pump and the shaft, when installing the oil pump. During assembly, install a new oil pump driveshaft retainer. To ease installation, slightly heat the retainer to above room temperature.

  2.  
  3. Assemble the oil pump, driveshaft and a new retainer.
  4.  
  5. Install or connect the following:

    Oil pump, positioning it on the locating pins
     
    Oil pump bolt and tighten to 56 ft. lbs. (75 Nm)
     
    Oil pan
     

  6.  
  7. Refill the engine crankcase
  8.  
  9. Disable the ignition system; crank engine for approximately 10 seconds to aid in priming the oil pump and reducing the risk of engine damage.
    NOTE
    If the oil pump does not build up oil pressure almost immediately, remove the pan and check for a loose oil pump-to-pick-up tube attachment. If necessary dismantle the pump and pack the pump cavity with petroleum jelly. Running the engine without measurable oil pressure will cause extensive damage.

  10.  

  1. Remove or disconnect the following:

    Oil pan
     
    Oil pump screen bolt
     
    Oil pump, retainer and driveshaft. Discard the driveshaft retainer
     
    Crankshaft oil deflector nuts
     
    Crankshaft oil deflector
     
    Oil pump bolts
     
    Oil pump
     

  2.  
  3. Clean and inspect the oil pump

    Click image to see an enlarged view

    Fig. Oil pump removal-8.1L engines

  4.  

To install:

  1. Install the crankshaft oil deflector. Tighten the nuts to 37 ft. lbs. (50 Nm).
    NOTE
    Always replace the retainer between the oil pump and the shaft, when installing the oil pump. During assembly, install a new oil pump driveshaft retainer. To ease installation, slightly heat the retainer to above room temperature.

  2.  
  3. Assemble the oil pump, driveshaft and a new retainer.
  4.  
  5. Install or connect the following:

    Oil pump, positioning it on the locating pins
     
    Oil pump bolt and tighten to 56 ft. lbs. (75 Nm)
     
    Oil pan
     

  6.  
  7. Refill the engine crankcase
  8.  
  9. Disable the ignition system; crank engine for approximately 10 seconds to aid in priming the oil pump and reducing the risk of engine damage.
    NOTE
    If the oil pump does not build up oil pressure almost immediately, remove the pan and check for a loose oil pump-to-pick-up tube attachment. If necessary dismantle the pump and pack the pump cavity with petroleum jelly. Running the engine without measurable oil pressure will cause extensive damage.

  10.  

  1. Remove or disconnect the following:

    Oil pan
     
    Oil pump screen bolt
     
    Oil pump, retainer and driveshaft. Discard the driveshaft retainer
     
    Crankshaft oil deflector nuts
     
    Crankshaft oil deflector
     
    Oil pump bolts
     
    Oil pump
     

  2.  
  3. Clean and inspect the oil pump

    Click image to see an enlarged view

    Fig. Oil pump removal-8.1L engines

  4.  

To install:

  1. Install the crankshaft oil deflector. Tighten the nuts to 37 ft. lbs. (50 Nm).
    NOTE
    Always replace the retainer between the oil pump and the shaft, when installing the oil pump. During assembly, install a new oil pump driveshaft retainer. To ease installation, slightly heat the retainer to above room temperature.

  2.  
  3. Assemble the oil pump, driveshaft and a new retainer.
  4.  
  5. Install or connect the following:

    Oil pump, positioning it on the locating pins
     
    Oil pump bolt and tighten to 56 ft. lbs. (75 Nm)
     
    Oil pan
     

  6.  
  7. Refill the engine crankcase
  8.  
  9. Disable the ignition system; crank engine for approximately 10 seconds to aid in priming the oil pump and reducing the risk of engine damage.
    NOTE
    If the oil pump does not build up oil pressure almost immediately, remove the pan and check for a loose oil pump-to-pick-up tube attachment. If necessary dismantle the pump and pack the pump cavity with petroleum jelly. Running the engine without measurable oil pressure will cause extensive damage.

  10.  

 
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