Rear cover and crank seal questions
02-02-2012, 08:15 AM
#1
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Rear cover and crank seal questions I thought about hijacking a thread but thought better of it.....
This is LS related, but is actually on my 2000 5.3 Silverado. Should be the same on an LS1. I'm getting ready to do the rear crank seal and have a few questions after researching. I can get the rear crank seal, updated p/n 89060436 with the white plastic install tool built in for about $15, I can get the rear cover seal gasket for about $15, or I can get the updated rear cover assembly, p/n 12633579, with the gasket, seal, and bolts for $40. The rear cover assembly is the updated version for a tsb, I'm thinking 03-06 aluminum blocks or something. I'd have to look back at the tsb for exact info. Will this cover work with my 5.3? I know the alignment tool isn't needed anymore for the crank seal, is a tool needed for the cover? I'm almost sure the rear cover isn't leaking and I'm not sure even if it's prone to leaking, but if it isn't leaking I'd rather just replace the crank seal and be done. Thanks!
This is LS related, but is actually on my 2000 5.3 Silverado. Should be the same on an LS1. I'm getting ready to do the rear crank seal and have a few questions after researching. I can get the rear crank seal, updated p/n 89060436 with the white plastic install tool built in for about $15, I can get the rear cover seal gasket for about $15, or I can get the updated rear cover assembly, p/n 12633579, with the gasket, seal, and bolts for $40. The rear cover assembly is the updated version for a tsb, I'm thinking 03-06 aluminum blocks or something. I'd have to look back at the tsb for exact info. Will this cover work with my 5.3? I know the alignment tool isn't needed anymore for the crank seal, is a tool needed for the cover? I'm almost sure the rear cover isn't leaking and I'm not sure even if it's prone to leaking, but if it isn't leaking I'd rather just replace the crank seal and be done. Thanks!
02-02-2012, 10:04 AM
#2
Im not aware of any tsb im not aware of any tsb regarding the rear seal. I am aware that pulling the trans to replace it is a major pain in the *** and doing it twice because you didn't think you needed to change the rear main seal housing gasket will make you say lots of colorful words that your parents or children probably wont appreciate. With this much labor involved and as cheap as the parts are its just smart to do it once and do it right
02-02-2012, 12:22 PM
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Here's TSB 05-06-01-034J. Mine's not in the TSB due to it being a 2000, but I was curious if this cover would fit. I'm guessing it will, I don't think there's any difference in the back of the LS motors. For $40 I'll go ahead and buy the updated one and be done with it. Just curious, any time I see this part number it comes up with this TSB.
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
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)
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.
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
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)
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.
