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Old 07-29-2010, 11:56 AM   #1
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Who is suffering or suffered from Engine Rear Cover Leak

Service Bulletin: #05-06-01-034K: 5.3L, 5.7L, 6.0L, 6.2L, 7.0L-Engine Oil Leak at Rear Cover Assembly Area (Engine Block Porosity RTV Repair Procedure) - (Apr 8, 2010)

Some customers may comment on an engine oil leak.

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.

The porosity issue is in the gasket sealing surface at the top of the cover, near the high pressure oil crossover port. 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.

Last edited by ffrcobra_65; 07-29-2010 at 01:03 PM.
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