Engine - Oil Leak At Oil Cooler Hose/Pipe Assembly
TECHNICALBulletin No.: 08-06-02-003B
Date: August 29, 2011
Subject: Engine Oil Leak at Engine Oil Cooler Hose/Pipe Adapter to Engine Connection (Diagnose and Repair as Outlined)
Models:
2007-2012 Chevrolet Silverado, Suburban, Tahoe
2008-2012 Chevrolet Express
2007-2012 GMC Sierra, Yukon, Yukon XL
2008-2012 GMC Savana
Equipped with 4.8L, 5.3L, 6.0L or 6.2L V8 Engine (VIN Code C, M, L, J, 4, 0, 3, 5, K, Y, 8 or 2 - RPO LY2, LH6, LY5, LMF, LMG, LC9, LFA, LY6, L76, L92 or L9H) and Engine Oil Cooling System RPO KC4
Supercede:
This bulletin is being revised to add 2012 model years. Please discard Corporate Bulletin Number 08-06-02-003A (Section 06 - Engine/Propulsion System).
Condition
Some customers may comment on an engine oil leak. Upon further investigation, the technician may find engine oil leaking from the engine oil cooler hose/pipe adapter at the point where it connects to the engine.
Cause
This condition may be caused by any of the following:
- A damaged engine oil cooler hose/pipe adapter gasket, due to a temporary steel sealing device not being removed when the engine oil cooler hose/pipe adapter was first connected to the engine.
- Previous oil leak servicing of the engine oil cooler hose/pipe adapter gasket that involved failing to remove the temporary steel sealing device.
- Casting porosity at the engine oil cooler hose/pipe adapter bolt holes of the engine.
- The engine oil cooler hose/pipe adapter bolts are not torqued to the proper specification.
Correction
1. Perform the oil leak diagnosis procedure. Refer to Oil Leak Diagnosis in SI.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
3. The temporary steel sealing device (1) is shown separately from the adapter gasket (2). The temporary steel sealing device SHOULD NOT be installed on the engine or the engine oil cooler hose/pipe adapter.
Note
Inspect closely for the temporary steel sealing device (1) being positioned tightly to the gasket (2) as shown. Only a small corner (1) of the temporary steel sealing device may be observable, depending on orientation.
Perform a visual inspection in order to verify that the oil leak is coming from the engine oil cooler hose/pipe adapter area or the gasket where it connects to the engine.
• If the leak is coming from the engine oil cooler hose/pipe adapter area, the bolts or the gasket where it connects to the engine, proceed to Step 4.
• If the leak is not coming from the engine oil cooler hose/pipe adapter area, the bolts or the gasket where it connects to the engine, refer to Oil Leak Diagnosis in SI.
4. To gain clearance, loosen or remove the engine oil cooler hose/pipe retaining bracket bolt (1).
5. Remove the engine oil cooler hose/pipe adapter bolts (2).
6. Remove and DISCARD both the temporary steel sealing device if present and the gasket.
7. Clean the mating surfaces of the engine oil cooler hose/pipe adapter and the engine.
8. Clean both bolt holes with brake cleaner and dry using regulated compressed air.
9. Clean both bolt threads and apply Pipe Sealant P/N 12346004 (Canada P/N 10953480) or equivalent (Loctite(R) 565) to the bolt threads. Verify that the sealant is applied 360 degrees around the bolt and extends from the tip of the bolt and covers at least 15 mm (0.59 in) of threads.
10. Install the engine oil cooler hose/pipe adapter with a NEW gasket.
11. Install the engine oil cooler hose/pipe adapter bolts (2) and:
Tighten
Tighten the bolts to 12 Nm (106 lb in).
12. Install the engine oil cooler hose/pipe retaining bracket bolt (1) and:
Tighten
Tighten the bolt to 25 Nm (18 lb ft).
13. Verify the correct engine oil level.
14. Verify the repair. Refer to Oil Leak Diagnosis in SI.
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer