Silverado 2008

Oil Pump

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Inspection



4.3L Engines

Specific to:

Chevrolet Silverado 1500 2008


CAUTION
Wear safety glasses in order to avoid eye damage.



Click image to see an enlarged view

Fig. Oil pump assembly-4.3L engines

  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 (1)
     
    Damaged gears (2) for the following:
     
    Chipping
     
    Galling
     
    Wear
     
    Scoring, damage or casting imperfections to the body (3)
     
    Damaged or scored gear shaft (4)
     
    Damaged or scored gear shaft (5)
     
    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
     
    If the oil pump is to be reused, install a NEW oil pump pressure relief valve spring.
     
    During oil pump installation, install a NEW oil pump driveshaft retainer.
     

  6.  

4.8L, 5.3L & 6.0L Engines

Specific to:

Chevrolet Silverado 1500 2008


CAUTION
Wear safety glasses in order to avoid eye damage.



Click image to see an enlarged view

Fig. Oil pump assembly-4.8L, 5.3L 6.0L engines


NOTE
The internal parts of the oil pump assembly are not serviced separately, excluding the spring. If the oil pump components are worn or damaged, replace the oil pump as an assembly.


NOTE
The oil pump pipe and screen are to be serviced as an assembly. Do not attempt to repair the wire mesh portion of the pump and screen assembly.

  1. Clean the parts in solvent.
  2.  
  3. Dry the parts with compressed air.

    Inspect the oil pump housing (413) and the cover (409) for cracks, excessive wear, scoring, or casting imperfections.
     
    Inspect the oil pump housing-to-engine block oil gallery surface for scratches or gouging.
     
    Inspect the oil pump housing for damaged bolt hole threads.
     
    Inspect the relief valve plug (416) and plug bore for damaged threads.
     
    Inspect the oil pump internal oil passages for restrictions.
     
    Inspect the drive gear (410) and driven gear (412) for chipping, galling or wear. Minor burrs or imperfections on the gears may be removed with a fine oil stone.
     
    Inspect the drive gear splines for excessive wear.
     
    Inspect the pressure relief valve (414) and bore for scoring or wear. The valve must move freely in the bore with no restrictions.
     
    Inspect the oil pump screen for debris or restrictions.
     
    Inspect the oil pump screen for broken or loose wire mesh.
     

  4.  

Removal & Installation



4.3L Engines

Specific to:

Chevrolet Silverado 1500 2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise and support the vehicle safely.
  6.  
  7. Remove or disconnect the following:

    Oil pan
     
    Oil pump mounting bolt
     
    Oil pump

    Click image to see an enlarged view

    Fig. Oil pump and related components-4.3L engines



    Click image to see an enlarged view

    Fig. Oil pan and related components-4.3L engines



    Click image to see an enlarged view

    Fig. Oil pump alignment-4.3L engines

     

  8.  

To install:

  1. Inspect the oil pump locator pins for damage, and replace if required.
    NOTE
    Do not reuse the oil pump driveshaft retainer. Install a new one.

  2.  
  3. Clean and inspect the oil pump.
  4.  
  5. Position the oil pump onto the locator pins.
  6.  
  7. Install the oil pump bolt and tighten the bolt to 66 ft. lbs. (90 Nm).
  8.  
  9. Install the oil pan.
  10.  

4.8L, 5.3L & 6.0L Engines

Specific to:

Chevrolet Silverado 1500 2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise and support the vehicle safely.
  6.  
  7. Remove or disconnect the following:
    NOTE
    Do not allow dirt or debris to enter the oil pump assembly, cap ends as necessary.


    NOTE
    The internal parts of the oil pump assembly are not serviced separately (excluding the spring). If the oil pump components are worn or damaged, replace the oil pump as an assembly. Do not attempt to repair the wire mesh portion of the pump and screen assembly.



    Engine front cover
     
    Oil pan
     
    Oil pump screen bolt and nuts
     
    Oil pump screen with O-ring seal.
     
    O-ring seal from the pump screen. Discard the O-ring seal.
     
    Remaining crankshaft oil deflector nuts.
     
    Crankshaft oil deflector
     
    Oil pump bolts
     



    Oil pump
     



    Click image to see an enlarged view

    Fig. Oil pump and related components-4.8L, 5.3L & 6.0L engines



    Click image to see an enlarged view

    Fig. Oil pump disassembly-4.8L, 5.3L & 6.0L engines



    Click image to see an enlarged view

    Fig. Oil pan and related components-4.8L, 5.3L & 6.0L engines



    Click image to see an enlarged view

    Fig. Oil pump screen and related components-4.8L, 5.3L & 6.0L engines



    Click image to see an enlarged view

    Fig. Front cover and related components-4.8L and 5.3L engines



    Click image to see an enlarged view

    Fig. Front cover and related components-6.0L engines

  8.  

To install:


NOTE
Inspect the oil pump and engine block oil gallery passages. These surfaces must be clear and free of debris or restrictions.

  1. Align the splined surfaces of the crankshaft sprocket and the oil pump drive gear and install the oil pump. Install the oil pump onto the crankshaft sprocket until the pump housing contacts the face of the engine block.
  2.  
  3. Install or connect the following:
    NOTE
    Lubricate a NEW oil pump screen O-ring seal with clean engine oil.


    NOTE
    Push the oil pump screen tube completely into the oil pump prior to tightening the bolt. Do not allow the bolt to pull the tube into the pump.



    Oil pump bolts. Tighten the oil pump bolts to 18 ft. lbs. (25 Nm).
     
    Crankshaft oil deflector
     



    NEW O-ring seal onto the oil pump screen
     

  4.  
  5. Align the oil pump screen mounting brackets with the correct crankshaft bearing cap studs.
  6.  
  7. Install or connect the following:

    Oil pump screen
     
    Oil pump screen bolt and the deflector nuts. Tighten the bolt to 106 inch lbs. (12 Nm) and the nuts to 18 ft. lbs. (25 Nm).
     
    Oil pan
     
    Engine front cover
     

  8.  

 
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