Document ID: 2368129 Page 1 of 6
Document ID: 2368129 #05-06-01-034J: 5.3L, 5.7L, 6.0L, 6.2L, 7.0L - Engine Oil Leak at Rear Cover Assembly Area (Engine Block Porosity RTV Repair Procedure) - (Nov 12, 2009)
Subject: 5.3L, 5.7L, 6.0L, 6.2L, 7.0L - Engine Oil Leak at Rear Cover Assembly Area (Engine Block Porosity RTV Repair Procedure)
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 2003-2009 Chevrolet TrailBlazer 2003-2010 Chevrolet Corvette 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 2010 Chevrolet Camaro 2003-2009 GMC Envoy 2003-2010 GMC Sierra 2004-2005 GMC Envoy XUV 2007-2010 GMC Yukon XL, Yukon Denali, Yukon XL Denali 2009-2010 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)
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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.
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Important: Clean any residual oil from the block and cover before applying the sealant in the next step.
• 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. • Remove any excess RTV material, especially from inside the high pressure oil passage. Refer to #1 in the above illustration. • 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.
• 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.
Part Number Description Qty
12574293 Gasket - Crankshaft Rear Oil Seal Housing 1
89060436 Seal, Crankshaft Rear Main 1
Sealant 1 12378521
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(in Canada, use 88901148)
88861206 Dye, Engine Oil 1 (in Canada, use 88861259)
12633579 Housing Asm-Rear Cover 1
Warranty Information (excluding Saab U.S. Models)
For vehicles repaired under warranty, use:
Labor Labor Operation Description Time
Oil Leak -- Rear Cover Area -- Porosity Repair
CTS-V 5.5 hrs
Corvette
- M/T 5.9 hrs
- A/T 5.4 hrs
SSR 5.4 hrs
J7510* TrailBlazer/Envoy/Rainier/Saab 9-7X /Saab 9-7X Aero, H3 - 2WD 5.7 hrs
- 4WD 6.5 hrs
GTO
- M/T 4.1 hrs
- A/T 4.3 hrs
G8/Camaro 4.0 hrs
Grand Prix/Impala/Monte Carlo/LaCrosse/Allure 5.7 hrs
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Silverado//Sierra Models
- M/T 4.5 hrs
- A/T 5.5 hrs
Avalanche, Escalade, Suburban, Tahoe, Yukon Models and 4.5 hrs H2
With skid plate 0.2 hr
Add 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:
Labor Failed Fault/Reason Location Warranty Repair/Action Labor Operation Description Object Code Code Type Code Time
Replace part, Seal, 2161901 21619 57 0 01 01 6.5 hrs End Plate V8 T-Truck
Add R&R Anti- Submarine ------0.2 hr 9821001 (Skid) Plate
To clean 0.1 to parts over 0.3 hr Add ------48,000 km in 99 (30,000 mi) time
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GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the WE SUPPORT proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know- VOLUNTARY how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your TECHNICIAN vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. CERTIFICATION
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