lovemyls4

Anyone have any issues with the rear main seal? its def leaking . . . not bad enough to drip on the ground yet. Also power steering fluid coming from the rack. Anyone else?

2007 impala SS

27K Thank god for warranties

Nacho SS

iTrader: (4)

Haven't heard of any RMS problems but you could check if there's any TSBs out for w-bodies and rear main seal problems.

MonteSS8707

iTrader: (4)

No rear main seal issue here, but my damn oil pan gasket is leaking, and this is after the dealershit tried to use rtv to put a bandaid on a bullet wound. Different dealershit next time. Would do it myself...but why? Warranty...sounds like a job for somebody else.

StealthV8

iTrader: (1)

I believe my rear main seal is leaking, doesn't do it all the time only when revving the engine. Just noticed it as the car has been parkd and is only started once or twice a week.. Anyways here is the TSB about it
Engine - Oil Leak From Rear Cover Assembly Area

Bulletin No.: 05-06-01-034E

Date: February 12, 2007

TECHNICAL
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(TM) GEN III or GEN IV V8 Engine (RPOs LC9, LS4, L33, LH6, LM4, LS1, LS6, LS2, L76, L92, LS7)

Supercede:

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.

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.

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.

bigboy3l

I have had Rear main seal changed once, oil pan gasket replaced once and it was still some oil drippage not much but noticable. never had to add oil. Turned out to be the valve cover on the firewall side needed to be retightened.

Mels SS

iTrader: (1)

Good info!!

lovemyls4

just an update . . . they couldnt see where the oil leak was coming from so they put a dye in the oil, have to bring it back in a few days. They are replacing the whole steering rack for the PS fluid leak . . .

oldfart1941

have a oil leak where bellhousing meets block, run a dye in engine only and show its engine oil,pulled tranny (5spd) and bellhousing,clutch was dry,so was flywheel but considerable amount of oil in bottom of bellhousing,rear seal and cover plate seems to be okay?? this is a 05 ls2 in a 67 camaro,tremec 5spd and kiesler hydraulic clutch which runs dot4 blake fluid . the front of the 5spd shows traces of fluid and tranny was low on fluid yet the dye test shows engine oil as the culprit,any suggestions???

Panther427

My PS lines are leaking

72gp

2005 gxp just replaced rack...they tried putting an ac rack in and it failed right away. They put a gm rack in an it now steers better that it ever has. It was leaking into the boot. i brought it in for ISS and they found the rack leaking. I had extended warranty.

50,000 miles