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    GM Century/Lumina/Grand Prix/Intrigue 1997-2000

    Rear Crankshaft Seal

    Print

    REMOVAL & INSTALLATION



    3.1L, 3.4L and 3.8L Engines

    Please note that the entire transaxle assembly must be removed to perform this procedure. Make very sure of the diagnosis before beginning work.

    1. Remove the transaxle from the vehicle. Please see .
    2.  
    3. Remove the engine flywheel using the procedures found in this section.
    4.  
    5. Remove the rear oil seal by prying out of the engine block. Use care not to nick the crankshaft when removing the seal. Pry the seal a little at a time, repeating as necessary around the crankshaft rear oil seal.
    6.  



    Click image to see an enlarged view

    Fig. Rear crankshaft seal service-3.1L, 3.4L and 3.8L engines

    To install:

    1. Clean all parts well. Coat the new seal entirely with clean engine oil.
    2.  
    3. GM recommends their seal installer J 34686 which presses the replacement seal into place. Many replacement seal kits come with a plastic driver suitable for one-time use. Use care if using substitutes. The goal is to get the seal installed squarely, bottomed in its bore, without damage. If there is any question about the condition of the seal after installation, remove and discard it and try again with another seal. Much time and effort are spend getting access to the rear crankshaft seal. Take the time to make sure it is correctly installed.
    4.  
    5. When satisfied with the seal installation, install the flywheel using the procedures found in this section.
    6.  
    7. Install the transaxle using the procedures found in .
    8.  

    3.5L Engine

    Please note that the entire transaxle assembly must be removed to perform this procedure. Make very sure of the diagnosis before beginning work.

    1. Remove the transaxle from the vehicle. Please see .
    2.  


    WARNING
    Rear crankshaft seal removal cannot be performed on an engine stand. If the engine is out of the vehicle, properly support the engine on a bench or on the floor, keeping in mind that the major components including the oil pan are made of aluminum.

    1. Remove the flywheel assembly using the procedures found in this section.
    2.  
    3. GM recommends their Special Tool J 42841 to remove the crankshaft rear oil seal. Essentially this is a metal plate with a center hole threaded for a center forcing screw. The plate has eight holes around the outside edge through which 1 inch long self-drilling sheetmetal screws are installed. When the center forcing screw is turned, the plate pulls the seal out. Use care if using substitutes.
    4.  



    Click image to see an enlarged view

    Fig. Rear crankshaft oil seal removal-3.5L (VIN H) engine



    Click image to see an enlarged view

    Fig. Rear crankshaft oil seal installation-3.5L (VIN H) engine

    To install:

    1. Clean all parts well. It is important to make sure the drain is clear before installing the new crankshaft rear oil seal. Failure to clear the drain could cause the crankshaft oil seal to leak. Probe the drain hole with wire or a long plastic tie-wrap.
    2.  
    3. Place a small amount of sealer, GM #1052942 Gasket Maker, or equivalent, at the crankcase split line across the end of the upper/lower crankcase seal.
    4.  
    5. Coat the outer diameter of the crankshaft where the seal will ride, with clean engine oil. DO NOT allow any engine oil on the area where the oil seal is to be pressed onto the rear crankshaft. The factory replacement seal has a green coating pre-applied to the inner diameter of the oil seal and must not be contaminated.
    6.  
    7. Wipe the outer diameter of the flywheel flange clean with a lint-free cloth.
    8.  
    9. DO NOT put any engine oil on the green coating pre-applied to the inner diameter of the oil seal. This coating is a sealant that must not be contaminated. Lubricate the outer rubber surface of the oil seal with clean engine oil.
    10.  
    11. GM recommends their J 42842 oil seal installer. This plate holds the seal and three bolts thread into the rear of the crankshaft and pull the seal into place. Use care if using substitutes. The goal is to get the seal installed squarely, bottomed in its bore, without damage. If there is any question about the condition of the seal after installation, remove and discard it and try again with another seal. Much time and effort are spend getting access to the rear crankshaft seal. Take the time to make sure it is correctly installed.
    12.  
    13. When satisfied with the seal installation, install the flywheel using the procedures found in this section.
    14.  
    15. Install the transaxle as outlined in .
    16.  

     
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