Silverado 2008

Rear Main Seal

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Removal & Installation



4.3L, 4.8L, 5.3L, 6.0L Engines

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

  1. Remove or disconnect the following:

    Negative battery cable
     
    Transfer case, if equipped
     
    Transmission assembly
     
    Flexplate
     
    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.

    Click image to see an enlarged view

    Fig. Rear main seal-4.3L engines



    Click image to see an enlarged view

    Fig. Rear main seal-4.8L, 5.3L & 6.0L engines

     

  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.

    Click image to see an enlarged view

    Fig. Rear main seal installation-4.3L engines



    Click image to see an enlarged view

    Fig. Rear main seal installation-4.8L, 5.3L & 6.0L engines

     
    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.  

 
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