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For 1990-2009 cars only

5.3L LC9, LS4, L33, LH6, LM4, 5.7L LS1, LS6, 6.0L LS2, L76 6.2L L92, 7.0L LS7 - Engine Oil Leak at Rear Cover Assembly Area (Engine Block Porosity RTV Repair Procedure)

Subject: 5.3L LC9, LS4, L33, LH6, LM4, 5.7L LS1, LS6, 6.0L LS2, L76, 6.2L L92, 7.0L LS7-- Engine Oil Leak at Rear Cover Assembly Area (Engine Block Porosity RTV Repair Procedure)

Models:2008-2009 Buick LaCrosse Super, Allure Super (Canada Only)
2004-2007 Buick Rainier
2005-2007 Cadillac CTS-V
2007-2009 Cadillac Escalade, Escalade ESV, Escalade EXT
2003-2009 Chevrolet Corvette, TrailBlazer
2004-2006 Chevrolet SSR
2005-2009 Chevrolet Silverado, Silverado SS
2006-2007 Chevrolet Monte Carlo SS
2006-2009 Chevrolet Impala SS, TrailBlazer SS
2007-2009 Chevrolet Avalanche, Suburban, Tahoe
2003-2009 GMC Envoy, Sierra
2004-2005 GMC Envoy XUV
2007-2009 GMC Yukon XL, Yukon Denali, Yukon XL Denali
2004-2006 Pontiac GTO
2005-2008 Pontiac Grand Prix GXP
2008-2009 Pontiac G8 GT
2005-2009 Saab 9-7X 5.3i
2008-2009 Saab 9-7X Aero
with 5.3L, 5.7L, 6.0L, 6.2L, 7.0L VORTEC™ GEN III or GEN IV V8 Engine (RPOs LC9, LS4, L33, LH6, LM4, LS1, LS6, LS2, L76, L92, LS7)



This bulletin is being revised to add model years and models. Please discard Corporate Bulletin Number 05-06-01-034E (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 for engine block porosity where the engine rear cover mates to the engine block. If porosity is found anywhere on the sealing surface, use the following procedure to apply RTV to repair the engine block porosity. Refer to the illustration below.


    Object Number: 1721811  Size: SH

    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.

  5. 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

12378521 (U.S.)

88901148 (Canada)

Sealant

1

88861206 (U.S.)

Dye, Engine Oil

1

88861259 (Canada)

Dye, Engine Oil

1

Warranty Information

Excluding Saab U.S. Models

For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

J7510*

Oil Leak -- Rear Cover Area -- Porosity Repair

CTS-V

5.5 hrs

Corvette

- M/T

- A/T

 

5.9 hrs

5.4 hrs

SSR

5.4 hrs

TrailBlazer/Envoy/Rainier/Saab 9-7X /Saab 9-7X Aero

- 2WD

- 4WD

 

5.7 hrs

6.5 hrs

GTO/G8

- M/T

- A/T

 

10.2 hrs

10.5 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

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 labor operation number is for bulletin use only. This number will not be published in the Labor Time Guide.

** HP2 Hybrid Propulsion Electric, AHS2

Saab U.S. Models

For vehicles repaired under warranty, use:

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