CTS 2006-2007, CTS-V 2005-2007, DTS 2006-2007

Rear Main Seal

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Removal & Installation



2.8L & 3.6L Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Flywheel
     
    Oil pan
     
    Rear oil seal housing bolts
     

  4.  
  5. Using the pry point located at the edge of the crankshaft rear main seal housing, shear the RTV sealant.
  6.  
  7. Remove the rear main oil seal.

    Click image to see an enlarged view

    Fig. Exploded view of the rear oil seal-2.8L and 3.6L

  8.  

To install:

  1. Install guide pins into the two crankshaft rear oil seal housing corner bolt hoses of the engine block.
  2.  
  3. Install the crankshaft rear seal installation tool onto the rear of the crankshaft flange.

    Click image to see an enlarged view

    Fig. Using the Crankshaft Rear Seal Installation Tool-2.8L and 3.6L

  4.  
  5. Apply a 0.2 inch (3mm) bead of silicone sealant to the rear oil seal housing.
  6.  
  7. Install the rear seal housing to the engine block.
  8.  
  9. Remove the guide pins and install the housing bolts. Tighten the bolts to 89 inch lbs. (10 Nm).
  10.  
  11. Remove the rear seal installation tool from the crankshaft flange.
  12.  
  13. Install or connect the following:

    Oil pan
     
    Flywheel
     
    Negative battery cable
     

  14.  
  15. Start the engine and check for leaks.
  16.  

4.6L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the transaxle.
  4.  
  5. Remove the flywheel.
  6.  
  7. Place the J 42841-A crankshaft rear oil seal remover on to the crankshaft.
  8.  
  9. Install the J 42841-A retaining bolts.

    Click image to see an enlarged view

    Fig. Installation of J 42841-A crankshaft rear oil seal remover

  10.  
  11. Using a drill motor, variable speed preferred, with a socket adapter, install eight one-inch self-drilling screws into the seal using the guide holes in the removal tool. When drilling, make sure you reduce the drill speed when the screw begins threading into the seal.
  12.  
  13. With all eight removal screws installed, remove the J 42841-A retaining bolts.
  14.  
  15. Install the center screw to the J 42841-A.

    Click image to see an enlarged view

    Fig. Center screw installation shown

  16.  
  17. Tighten the center screw on the J 42841-A to pull the seal assembly off the end of the crankshaft.
  18.  

To install:


WARNING
The EN-48072 must be used to ensure even application of the sealant in the bore and to prevent blockage of the drain back hole.

  1. Inspect the engine block bore and the crankshaft flange for the damage. Repair or replace any damaged components.
  2.  
  3. Ensure the oil drain-back hole is clear of debris using a wire or an unbound plastic tie wrap.
    NOTE
    In order to ensure proper bonding of the sealant the bore must be clean and dry.

  4.  
  5. Clean the bore in the block with cleaner solvent GM P/N 12378392 or 12346139 (Canadian P/N 88901247).

    Click image to see an enlarged view

    Fig. Crankshaft rear oil seal installer

  6.  
  7. Remove the proper sized bolts from the J 45930-A. Use the bolts (8 mm) or the bolts (11 mm).
  8.  
  9. Install the EN-48072 pilot base onto the crankshaft. The hub on the crankshaft will fit into the recess on the inboard side of the EN-48072 pilot base.
  10.  
  11. Use the proper bolts from the J 45930-A to retain the EN-48072 pilot base in place.

    Click image to see an enlarged view

    Fig. Crankshaft rear oil seal installer

  12.  
  13. Install the EN-48072 applicator housing over the EN-48072 pilot base. Ensure the EN-48072 applicator housing bottoms in the bore of the block.
    NOTE
    The sealant must not block the drain back hole. Blockage of the drain back hole can lead to oil leakage.

  14.  
  15. Apply the sealant GM P/N 12378521 (Canadian P/N 88901148) to the bore outer diameter in the block. Ensure the sealant does not block the drain hole.

    Click image to see an enlarged view

    Fig. Sealant application shown

  16.  
  17. Using a suitable tool spread the sealant within the bore to ensure an even coating across the bore.
  18.  
  19. Using both hands, slowly and evenly, pull the EN-48072 applicator housing out of the bore and remove it from the EN-48072 pilot base.
  20.  
  21. Remove the J 45930-A bolts from the EN-48072 pilot base.
  22.  
  23. Remove the EN-48072 pilot base.
  24.  
  25. Ensure that the sealant is evenly spread across the bore of the block.
  26.  
  27. Ensure the drain back hole is clear of the sealant.
  28.  
  29. Ensure the proper size of bolt (8 mm) or (11 mm) is being installed in the J 45930-A.
  30.  
  31. Turn the center nut of the J 45930-A until the center hub protrudes approximately 0.591 inch (15 mm) beyond the outer plate.
    NOTE
    Do not lubricate any part of the new cassette style crankshaft rear oil seal.



    Click image to see an enlarged view

    Fig. J 45930-A installation tool

  32.  
  33. Install the new cassette style crankshaft rear oil seal onto the center hub of the J 45930-A.
  34.  
  35. Thread the two J 45930-A mounting bolts into the crankshaft flywheel bolt holes.
  36.  
  37. Tighten the two mounting bolts until the J 45930-A is firmly mounted on the crankshaft.
  38.  
  39. Install the new cassette style crankshaft rear oil seal by turning the nut of the J 45930-A until the drive portion of the J 45930-A bottoms against the crankcase.

    Click image to see an enlarged view

    Fig. Rear main seal installation using J 45930-A

  40.  
  41. Loosen the center nut to release pressure on the crankcase.
  42.  
  43. Loosen the two mounting bolts.
  44.  
  45. Remove the J 45930-A from the crankshaft.
  46.  
  47. Wipe off any excessive sealant from the block.
  48.  
  49. Ensure the new cassette style crankshaft rear oil seal is installed properly as follows:

    The outer surface of the seal (3) should be (0.500-0.800 mm) 0.0197-0.0315 inch (1) below the surface of the engine block (2).
     
    The inner surface of the sleeve (6) should be 0.0158-0.0354 inch (0.400-0.900 mm) (4) below the surface of the outer surface of the seal (5).
     
    The installed seal and sleeve need to be parallel to the block by 0.000-0.0197 inch (0.000-0.500 mm).

    Click image to see an enlarged view

    Fig. View of properly installed rear main oil seal

     

  50.  
  51. Clean all tools to remove any residual sealant.
  52.  
  53. Install the flywheel.
  54.  
  55. Install the transaxle.
  56.  

5.7L & 6.0L Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the flywheel.
  4.  
  5. Gently pry the rear oil seal from the rear cover.
  6.  

To install:

Click image to see an enlarged view

Fig. View of the rear oil seal-5.7L & 6.0L engines

  1. Lubricate the outside diameter of the new rear oil seal and rear cover oil seal bore with clean engine oil.
    WARNING
    Do not allow oil or other lubricants to contact the crankshaft surface or surface or the seal.

  2.  
  3. Install the Rear Oil Seal Installer cone onto the rear of the crankshaft.
  4.  
  5. Install the rear oil seal onto the tapered cone of the installer tool and push the seal to the rear cover bore.
  6.  
  7. Install the threaded rod Installation Tool into the tapered cone until the tool contacts the seal.
  8.  
  9. Rotate the handle of the tool clockwise until the seal enters the rear cover and bottoms into the cover bore.

    Click image to see an enlarged view

    Fig. Install the oil seal installer cone (2) onto the crankshaft. Install the threaded rod of the Oil Seal Installer (1) into the cone.

  10.  
  11. Remove the rear oil seal installer tool.
  12.  
  13. Install the flywheel.
  14.  
  15. Start the engine and check for leaks.
  16.  

 
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