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

Rear Main Seal

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Removal & Installation



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

Please note that the entire transmission assembly and flywheel/flexplate must be removed to perform this procedure.

  1. Remove or disconnect the following:

    Negative battery cable
     
    Transfer case, if equipped
     
    Transmission assembly
     
    Clutch assembly and flywheel, if equipped with manual transmission
     
    Flexplate, if equipped with automatic transmission
     
    Crankshaft rear main oil seal by inserting a suitable prying tool and prying the seal out. Take care not to damage the crankshaft sealing surface.
     

  2.  

To install:

  1. Clean the oil seal bore in the block thoroughly before installation of the new seal.
  2.  
  3. Inspect the crankshaft for grit, rust or burrs and correct as necessary. Also inspect the portion of the crankshaft where the oil seal makes contact, for wear due to the rubbing action of the oil seal.
  4.  
  5. Clean the seal running surface of the crankshaft with a non-abrasive cleaner.
  6.  
  7. Lubricate the inner diameter of the new seal and the outer diameter of the crankshaft with engine oil.
  8.  
  9. Install or connect the following:

    Rear main oil seal, using installation tool J 38841, J-35621-B or J-41479, until the tool bottoms against the block and crankshaft rear main bearing cap.
     
    Flywheel and clutch
     
    Flexplate, as required
     
    Transmission assembly
     
    Transfer case, if equipped
     
    Negative battery cable
     

  10.  
  11. Start the engine and verify no oil leaks.
  12.  

8.1L Engine

Please note that the entire transmission assembly and flywheel/flexplate must be removed to perform this procedure. This procedure requires the use of the following tools: Crankshaft Rear Seal Puller tool No. J 43320 and Crankshaft Rear Seal Installer tool No. J 42849.

  1. Remove or disconnect the following:

    Negative battery cable
     
    Transfer case, if equipped
     
    Transmission assembly
     
    Clutch assembly and flywheel, if equipped with manual transmission
     
    Flexplate, if equipped with automatic transmission
     

  2.  
  3. Install the guide pins from the Crankshaft Rear Sear Puller into the crankshaft.
  4.  
  5. Install the Rear Seal Puller over the guide pins.
  6.  
  7. Using a drill, insert 8 of the self-drilling sheet metal screws into the rear crankshaft seal, using a crisscross pattern as shown. The self tapping screws are included with the Crankshaft Rear Seal Puller.

    Click image to see an enlarged view

    Fig. Drill the screws into the rear main seal using a crisscross pattern-8.1L engines

  8.  
  9. Thread the center bolt of the Crankshaft Rear Seal Puller into the crankshaft to remove the seal.
  10.  
  11. Remove the guide pins from the crankshaft.
  12.  

To install:

  1. Make sure there is no dirt, rust or loose burrs on the crankshaft.
  2.  
  3. Apply a light coating of engine oil to the crankshaft sealing surface. Do NOT get oil on the sealing surface of the engine block.
  4.  
  5. Install the new rear main seal onto the Crankshaft Rear Seal Installation Tool.
  6.  
  7. Position the Rear Seal Installation Tool against the crankshaft. Thread the attaching screws into the tapped holes in the crankshaft.
  8.  
  9. Use a screwdriver to tighten the screws securely to make sure the seal is squarely installed against the crankshaft.
  10.  
  11. Rotate the center nut until the installation tool bottoms, then remove the seal installation tool.
  12.  
  13. Install or connect the following:

    Flexplate, if equipped with automatic transmission
     
    Clutch assembly and flywheel, if equipped with manual transmission
     
    Transmission assembly
     
    Transfer case, if equipped
     
    Negative battery cable
     

  14.  

 
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