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

Rear Main Seal

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Removal & Installation



Please note that the entire transmission assembly must be removed before performing this procedure. Before a new seal is installed, the Crankcase Depression Regulator (CDR) and crankcase ventilation system should be cleaned and inspected. In addition, use care removing the flywheel. Some models use a heavy, dual mass flywheel that must be handled with care.

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

    Negative battery cables
     
    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 crankshaft seal removal tool and prying the seal out
     

  4.  

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.
    NOTE
    Because of rear crankshaft wear or grooving, the new oil seal should be seated in a new location. The J 39084 installation tool will control the seal positioning. This will provide a new surface on the crankshaft for the seal to ride on.

  4.  
  5. Clean the 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 a crankshaft rear oil seal installation tool
     
    Flywheel.
     
    Transmission assembly
     
    Transfer case, if equipped
     
    Negative battery cables
     

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

Please note that the entire transmission assembly must be removed before performing this procedure. Before a new seal is installed, the Crankcase Depression Regulator (CDR) and crankcase ventilation system should be cleaned and inspected. In addition, use care removing the flywheel. Some models use a heavy, dual mass flywheel that must be handled with care.

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

    Negative battery cables
     
    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 crankshaft seal removal tool and prying the seal out
     

  4.  

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.
    NOTE
    Because of rear crankshaft wear or grooving, the new oil seal should be seated in a new location. The J 39084 installation tool will control the seal positioning. This will provide a new surface on the crankshaft for the seal to ride on.

  4.  
  5. Clean the 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 a crankshaft rear oil seal installation tool
     
    Flywheel.
     
    Transmission assembly
     
    Transfer case, if equipped
     
    Negative battery cables
     

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

4.8L, 5.3L & 6.0L Engines

NOTE
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
     
    Flywheel
     
    Crankshaft spacer
     
    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, until the tool bottoms against the block and crankshaft rear main bearing cap.
     
    Flywheel
     

  10.  
  11. Tighten the flywheel bolts in a criss-cross pattern as follows:
    1. Tighten the bolts a first pass to 15 ft. lbs. (20 Nm).
    2.  
    3. Tighten the bolts a second pass to 37 ft. lbs. (50 Nm).
    4.  
    5. Tighten the bolts a final pass to 75 ft. lbs. (100 Nm).

      Transmission assembly
       
      Transfer case, if equipped
       
      Negative battery cable
       

    6.  

  12.  
  13. Start the engine and verify no oil leaks.
  14.  

5.7L & 7.4L Engines

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

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. 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.
     

  4.  

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, 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.  

6.5L & 6.6L Engines

Please note that the entire transmission assembly must be removed before performing this procedure. Before a new seal is installed, the Crankcase Depression Regulator (CDR) and crankcase ventilation system should be cleaned and inspected. In addition, use care removing the flywheel. Some models use a heavy, dual mass flywheel that must be handled with care.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cables
     
    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 crankshaft seal removal tool and prying the seal out
     

  4.  

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.
    NOTE
    Because of rear crankshaft wear or grooving, the new oil seal should be seated in a new location. The J 39084 installation tool will control the seal positioning. This will provide a new surface on the crankshaft for the seal to ride on.

  4.  
  5. Clean the 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 a crankshaft rear oil seal installation tool
     
    Flywheel.
     
    Transmission assembly
     
    Transfer case, if equipped
     
    Negative battery cables
     

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

6.5L Engine

Please note that the entire transmission assembly must be removed before performing this procedure. Before a new seal is installed, the Crankcase Depression Regulator (CDR) and crankcase ventilation system should be cleaned and inspected. In addition, use care removing the flywheel. Some models use a heavy, dual mass flywheel that must be handled with care.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cables
     
    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 crankshaft seal removal tool and prying the seal out
     

  4.  

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.
    NOTE
    Because of rear crankshaft wear or grooving, the new oil seal should be seated in a new location. Tool J 39084 installation tool will control the seal positioning. This will provide a new surface on the crankshaft for the seal to ride on.

  4.  
  5. Clean the 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 a crankshaft rear oil seal installation tool
     
    Flywheel.
     
    Transmission assembly
     
    Transfer case, if equipped
     
    Negative battery cables
     

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

6.6L Engine

Please note that the entire transmission assembly must be removed before performing this procedure. Before a new seal is installed, the Crankcase Depression Regulator (CDR) and crankcase ventilation system should be cleaned and inspected. In addition, use care removing the flywheel. Some models use a heavy, dual mass flywheel that must be handled with care.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cables
     
    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 crankshaft seal removal tool and prying the seal out
     

  4.  

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.
    NOTE
    Because of rear crankshaft wear or grooving, the new oil seal should be seated in a new location. The J 39084 installation tool will control the seal positioning. This will provide a new surface on the crankshaft for the seal to ride on.

  4.  
  5. Clean the 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 a crankshaft rear oil seal installation tool
     
    Flywheel.
     
    Transmission assembly
     
    Transfer case, if equipped
     
    Negative battery cables
     

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

Please note that the entire transmission assembly must be removed before performing this procedure. Before a new seal is installed, the Crankcase Depression Regulator (CDR) and crankcase ventilation system should be cleaned and inspected. In addition, use care removing the flywheel. Some models use a heavy, dual mass flywheel that must be handled with care.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cables
     
    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 crankshaft seal removal tool and prying the seal out
     

  4.  

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.
    NOTE
    Because of rear crankshaft wear or grooving, the new oil seal should be seated in a new location. The J 39084 installation tool will control the seal positioning. This will provide a new surface on the crankshaft for the seal to ride on.

  4.  
  5. Clean the 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 a crankshaft rear oil seal installation tool
     
    Flywheel.
     
    Transmission assembly
     
    Transfer case, if equipped
     
    Negative battery cables
     

  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 engine

  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.  

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
     
    Flywheel
     

  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 engine

  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 the flywheel bolts and tighten as follows:
    1. Tighten the bolts a first pass to 30 ft. lbs. (40 Nm).
    2.  
    3. Tighten the bolts a second pass to 59 ft. lbs. (80 Nm).
    4.  
    5. Tighten the bolts a final pass to 75 ft. lbs. (100 Nm).
    6.  

  14.  
  15. Install or connect the following:

    Transmission assembly
     
    Transfer case, if equipped
     
    Negative battery cable
     

  16.  

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. You must drill the screws into the rear main seal using a crisscross pattern-8.1L engine

  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.  

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. You must drill the screws into the rear main seal using a crisscross pattern-8.1L engine

  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.  

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.  

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.  

Except 6.5L, 6.6L & 8.1L 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.  

Except 6.6L & 8.1L 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.  

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.  

Except 8.1L Engine

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, 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.  

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, 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.  

 
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