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Makes 🢒 Chevrolet 🢒 2008 🢒 Chevy Suburban - 4WD 🢒 Bulletins 🢒 Engine Oil Leak at Engine Oil Cooler Hose/Pipe Assembly to Oil Pan Connection (Perform Outlined Repair)

Engine Oil Leak at Engine Oil Cooler Hose/Pipe Assembly to Oil Pan Connection (Perform Outlined Repair)

Subject:Engine Oil Leak at Engine Oil Cooler Hose/Pipe Assembly to Oil Pan Connection (Perform Outlined Repair)

Models:2007-2009 Chevrolet Silverado, Suburban, Tahoe
2008-2009 Chevrolet Express
2007-2009 GMC Sierra, Yukon, Yukon XL
2008-2009 GMC Savana
with 4.8L, 5.3L, 6.0L or 6.2L V8 Engine (VINs C, M, L, J, 4, 0, 3, 5, K, Y, 8 or 2 -- RPOs LY2, LH6, LY5, LMF, LMG, LC9, LFA, LY6, L76, L92 or L9H) and Engine Oil Cooler System (RPO KC4)


Condition

Some customers may comment on an engine oil leak. Upon further investigation, the technician may find fluid leaking from the engine oil cooler pipe to oil pan connection.

Cause

The leak may be caused by oil pan casting porosity at the engine oil cooler bolt cavity.

Correction

Verify that the leak is coming from the engine oil cooler pipe to oil pan connection by use of oil dye in the engine. Refer to Oil Leak Diagnosis in SI. Clean the suspected area of all residual oil and drive the vehicle to see if the dye begins to appear. If the leak is coming from the engine oil cooler pipe to oil pan connection, perform the procedure outlined below.

  1. Raise and support the vehicle.
  2. Remove one engine oil cooler hose/pipe assembly to oil pan bolt.
  3. Clean the bolt hole with brake cleaner and dry using compressed air.
  4. Clean the bolt threads and apply Pipe Sealant, P/N 12346004 (in Canada, 10953480) or equivalent (Loctite 565) to the bolt threads. Make sure that the sealant is applied 360° around the bolt and extends from the tip of the bolt and covers at least 15 mm (0.59 in) of threads.
  5. Reinstall the bolt.

    6. Tighten
    Tighten the bolt to 12 N·m (106 lb in).

  6. Repeat the above process for the second bolt.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

J7612*

Engine Oil Leak - Inspect/Repair Engine Oil Cooler to Oil Pan Connection

0.7 hr**

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 This number will not be published in the Labor Time Guide.

** This time includes leak diagnosis.