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5.3L, 5.7L, 6.0L, 6.2L, 7.0L - Engine Oil Leak at Rear Cover Assembly Area (Engine Block Porosity RTV Repair Procedure) (05-06-01-034L) — 2010 Hummer H3 Base, Automatic Service Manual

5.3L, 5.7L, 6.0L, 6.2L, 7.0L - Engine Oil Leak at Rear Cover Assembly Area (Engine Block Porosity RTV Repair Procedure) (05-06-01-034L)

Publication date: 2010-07-23
Reference number: 05-06-01-034L
Supersedes refnos: 05-06-01-034A, 05-06-01-034B, 05-06-01-034C, 05-06-01-034D, 05-06-01-034E, 05-06-01-034F, 05-06-01-034G, 05-06-01-034H, 05-06-01-034I, 05-06-01-034J, 05-06-01-034K

5.3L, 5.7L, 6.0L, 6.2L, 7.0L - Engine Oil Leak at Rear Cover Assembly Area (Engine Block Porosity RTV Repair Procedure)

5.3L, 5.7L, 6.0L, 6.2L, 7.0L - Engine Oil Leak at Rear Cover Assembly Area (Engine Block Porosity RTV Repair Procedure)

TECHNICAL SERVICE BULLETIN

Reference Number(s): 05-06-01-034L, Date of Issue:  July 23, 2010
Affected Model(s): 2004-2007 Buick Rainier; 2008-2009 Buick LaCrosse Super, Allure Super (Canada Only); 2005-2011 Cadillac CTS-V; 2007-2011 Cadillac Escalade, Escalade ESV, Escalade EXT; 2003-2009 Chevrolet TrailBlazer; 2003-2011 Chevrolet Corvette; 2004-2006 Chevrolet SSR; 2005-2011 Chevrolet Silverado, Silverado SS; 2006-2007 Chevrolet Monte Carlo SS; 2006-2009 Chevrolet TrailBlazer SS, Impala SS; 2007-2011 Chevrolet Avalanche, Suburban, Tahoe; 2009-2010 Chevrolet Colorado Pickup; 2010-2011Chevrolet Camaro; 2003-2009 GMC Envoy; 2003-2011 GMC Sierra; 2004-2005 GMC Envoy XUV; 2007-2011 GMC Yukon XL, Yukon Denali, Yukon XL Denali; 2009-2011 GMC Canyon; 2004-2006 Pontiac GTO; 2005-2008 Pontiac Grand Prix GXP; 2008-2009 Pontiac G8 GT; 2009 Pontiac G8 GXP; 2005-2009 Saab 9-7X 5.3i; 2008-2009 Saab 9-7X Aero; 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)
Supercedes: This bulletin is being revised to add the 2011 model year and update the Warranty Information for the Corvette. Please discard Corporate Bulletin Number 05-06-01-034K (Section 06 - Engine/Propulsion System).
Superceded Bulletin(s): 05-06-01-034K, Date of Issue:  April 8, 2010

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.

    Fig 1: Porous Block Surface
    GM2336378Courtesy of GENERAL MOTORS CORP.
    Fig 2: Sealing Surface
    GM1721811Courtesy of GENERAL MOTORS CORP.
    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.
    4. 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.

Parts Information

IMPORTANT: For Saab (U.S.) only, use P/N 88861206 - Engine Oil Dye (U.S.) or equivalent.
Parts Information

Part Number Description Qty
12574293 Gasket - Crankshaft Rear Oil Seal Housing 1
89060436 Seal, Crankshaft Rear Main 1
12378521
(in Canada, use 88901148)		 Sealant 1
88861206
(in Canada, use 88861259)		 Dye, Engine Oil 1
12633579 Housing Asm - Rear Cover 1

Warranty Information (excluding Saab U.S. Models)

For vehicles repaired under warranty, use:

Warranty Information (excluding Saab U.S. Models)

Labor Operation Description Labor Time
J7510* Oil Leak - Rear Cover Area - Porosity Repair
Colorado/Canyon 5.5 hrs
CTS-V 5.5 hrs
Corvette
- M/T
- A/T		  
8.0 hrs
6.7 hrs
SSR 5.4 hrs
TrailBlazer/Envoy/Rainier/Saab 9-7X /Saab 9-7X Aero, H3
- 2WD
- 4WD		  
5.7 hrs
6.5 hrs
GTO
- M/T
- A/T		  
4.1 hrs
4.3 hrs
G8/Camaro 4.0 hrs
Grand Prix/Impala/Monte Carlo/LaCrosse/Allure 5.7 hrs
Silverado//Sierra Models
- M/T
- A/T		  
4.5 hrs
5.5 hrs
Avalanche, Escalade, Suburban, Tahoe, Yukon Models and H2 4.5 hrs
Add With skid plate 0.2 hr
With HP2** 0.5 hr
To clean parts over 48,000 km (30,000 mi) 0.1-0.3 hr
* This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.
** HP2 Hybrid Propulsion Electric, AHS2

Warranty Information (Saab U.S. Models)

For vehicles repaired under warranty, use:

Warranty Information (Saab U.S. Models)

Labor Operation Description Failed Object Fault/Reason Code Location Code Warranty Type Repair/Action Code Labor Time
2161901 Replace part, Seal, End Plate V8 T-Truck 21619 57 0 01 01 6.5 hrs
Add
9821001		 R&R Anti-Submarine (Skid) Plate - - - - - 0.2 hr
Add To clean parts over 48,000 km (30,000 mi) - - - - - 0.1 to 0.3 hr in 99 time