Escalade, Suburban 1500 & 2500, Tahoe, Yukon, Yukon XL 1500 & 2500 (2006-2007), Yukon Denali and Yukon Denali XL (2005-2006)

Oil Pump

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Inspection



4.8L, 5.3L, 6.0L & 6.2L Engines

CAUTION
Wear safety glasses in order to avoid eye damage.



Click image to see an enlarged view

Fig. Exploded view of oil pump-4.8L, 5.3L, 6.0L and 6.2L 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 and the cover 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 and plug bore for damaged threads.
     
    Inspect the oil pump internal oil passages for restrictions.
     
    Inspect the drive gear and driven gear 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 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.  

8.1L Engine

CAUTION
Wear safety glasses in order to avoid eye damage.



Click image to see an enlarged view

Fig. Exploded view of oil pump-8.1L engines

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

    Scoring
     
    Chipping
     
    Galling
     
    Excessive wear
     

  6.  
  7. Inspect the oil pump housing for the following:

    Damaged bolt hole threads
     
    Worn oil pump driveshaft bore
     
    Scoring or excessive wear within the housing
     
    Worn driven gear shaft
     

  8.  
  9. Inspect for a collapsed pressure relief valve spring.
  10.  
  11. Inspect the pressure relief valve for scoring or wear. The valve should move freely within the bore of the housing.
  12.  

Removal & Installation



4.8L, 5.3L, 6.0L & 6.2L Engines


Click image to see an enlarged view

Fig. Exploded view of the oil pump mounting-4.8L, 5.3L, 6.0L and 6.2L engines



Click image to see an enlarged view

Fig. Oil pump disassembly-4.8L, 5.3L, 6.0L and 6.2L engines

  1. 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
     

  2.  

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.  

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 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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