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Thread: 05-06-01-034J:Engine Oil Leak at Rear Cover Assembly Area

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    Beyond Help WickedMom's Avatar
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    Default 05-06-01-034J:Engine Oil Leak at Rear Cover Assembly Area

    (Engine Block Porosity RTV Repair Procedure) - (Nov 12, 2009)

    Models: 2004-2007 Buick Rainier
    2008-2009 Buick LaCrosse Super, Allure Super (Canada Only)
    2005-2010 Cadillac CTS-V
    2007-2010 Cadillac Escalade, Escalade ESV, Escalade EXT
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    2004-2006 Chevrolet SSR
    2005-2010 Chevrolet Silverado, Silverado SS
    2006-2007 Chevrolet Monte Carlo SS
    2006-2009 Chevrolet TrailBlazer SS, Impala SS
    2007-2010 Chevrolet Avalanche, Suburban, Tahoe
    2009-2010 Chevrolet Colorado Pickup
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    2003-2009 GMC Envoy
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    2009-2010 GMC Canyon
    2004-2006 Pontiac GTO
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    2005-2009 Saab 9-7X 5.3i
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    2003-2010 HUMMER H2
    2006-2010 HUMMER H3
    with 5.3L, 5.7L, 6.0L, 6.2L, 7.0L VORTEC™ GEN III or GEN IV V8 Engine (All Aluminum Block) (RPOs L33, LC9, LH6, LH8, LH9, LM4, LS4, LS1, LS6, L76, L77, LFA, LZ1, LS2, L92, L94, L99, L9H, LS3, LS9, LSA, LS7)

    This bulletin is being revised to add RPOs and model years. Please discard Corporate Bulletin Number 05-06-01-034I (Section 06 -- Engine/Propulsion System).
    Condition

    Some customers may comment on an engine oil leak.
    Cause

    Upon initial diagnosis, it may be determined that the leak is coming from the rear cover gasket. This condition may be caused by engine block porosity on the sealing surface. This issue pertains to aluminum block applications only.
    Correction

    Follow the steps for Oil Leak Diagnosis in SI to determine the source of the leak. If the leak has been diagnosed as coming from the engine rear cover assembly, refer to Engine Rear Cover Replacement in SI and remove the engine rear cover assembly. Inspect the engine block and engine rear cover for porosity on the mating surfaces.
    • If porosity is found on the engine rear cover (see illustration below), replace the engine rear cover assembly, GM P/N 12633579.
    • If porosity is found on the engine block, use the following procedure to apply RTV to repair the engine block porosity.

    The porosity issue is in the gasket sealing surface at the top of the cover, near the high pressure oil crossover port. Refer to the picture below. The oil leaks by the gasket and runs down the side of the cover, and may appear to be a leak at the t-joint area of the cover. The fix is to replace the cover with GM P/N 12633579. Also, if porosity is found anywhere on the sealing surface of the engine block, use the following procedure to apply RTV to repair the engine block porosity. Refer to the illustration below.





    Important: Clean any residual oil from the block and cover before applying the sealant in the next step.
    1. Wipe a small amount of RTV, P/N 12378521 (in Canada, use P/N 88901148), onto the surface using a plastic scraper to fill the porosity.
    2. Remove any excess RTV material, especially from inside the high pressure oil passage. Refer to #1 in the above illustration.
    3. The joint may be closed immediately after applying the RTV. Total joint time after the RTV has been applied must be under 20 minutes.

    Important: Refer to Engine Rear Cover Replacement in SI and follow the tightening specifications and sequence.
    4. Reinstall the engine rear cover using a new gasket and a new crankshaft rear main seal. Refer to Engine Rear Cover Replacement in SI.
    **RIP Shaun Finley**
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    Default

    Hey, just saw this post. Can you repost it with the photos? They aren't showing up.
    Thanks!

  3. #3
    Moderator, Retired -Ray-'s Avatar
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    They aren't showing up because there weren't any posted.
    Rest in Peace Charlie!

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    There were. I guess you're not seeing it either.

  5. #5
    Moderator travis gore's Avatar
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    I do not see photos either. there appears to be 2 photos not showing.
    Holy Cow a 6 year old thread
    2009 Karma Metallic G8 GT The best gift you can give to someone is your time,because you're giving them something that you can never get back

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