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: | 2004-2007 Buick Rainier |
| 2005-2007 Cadillac CTS-V |
| 2007 Cadillac Escalade, Escalade ESV, Escalade EXT |
| 2003-2007 Chevrolet Corvette, TrailBlazer |
| 2004-2006 Chevrolet SSR |
| 2005-2007 Chevrolet Silverado, Silverado SS |
| 2006-2007 Chevrolet Impala SS, Monte Carlo SS, TrailBlazer SS |
| 2007 Chevrolet Avalanche, Suburban, Tahoe |
| 2003-2007 GMC Envoy, Sierra |
| 2004-2005 GMC Envoy XUV |
| 2007 GMC Yukon XL, Yukon Denali, Yukon XL Denali |
| 2004-2006 Pontiac GTO |
| 2005-2007 Pontiac Grand Prix GXP |
| 2005-2007 Saab 9-7X |
| 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 update warranty information. Please discard Corporate Bulletin Number 05-06-01-034D (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.
- 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.
- Reinstall the engine rear cover using a new gasket and a new crankshaft rear main seal. Refer to Engine Rear Cover Replacement in SI.
Important: Clean any residual oil from the block and cover before applying the sealant in the next step.
Important: Refer to Engine Rear Cover Replacement in SI and follow the tightening specifications and sequence.
Parts Information
Important: For Saab (U.S.) only, use P/N 12345795, 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 |
12345795 (U.S.) | Dye, Engine Oil | 1 |
10953470 (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 (Canada) - 2WD - 4WD |
5.7 hrs 6.5 hrs | |
GTO - M/T - A/T |
10.2 hrs 10.5 hrs | |
Grand Prix/Impala/Monte Carlo | 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 is for bulletin use only. It 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 |
