Subject: | Oil Leak at Oil Cooler to Engine Block Mating Surface (Replace O-rings, Apply Sealant) |
Models: | 2001-2005 Chevrolet Silverado 2500/3500 Series Pickup Models |
| 2003-2005 Chevrolet Kodiak C4500/5500 Series Models |
| 2001-2005 GMC Sierra 2500/3500 Series Pickup Models |
| 2003-2005 GMC TopKick C4500/5500 Series Models |
| with 6.6L Duramax™ Diesel Engine (VINs 1, 2 -- RPOs LB7, LLY) |
This bulletin is being revised to change the part number and update the Warranty information. Please discard Corporate Bulletin Number 02-06-01-023E (Section 06 -- Engine/Propulsion System).
Condition
Some customers may comment on oil leaks at the engine oil cooler.
Cause
Minor imperfections in the engine block machined surfaces at the oil cooler interface may allow oil seepage past the oil cooler O-rings.
Correction
- Inspect for other oil leaks that may be perceived as an oil cooler leak. An oil leak from one of the main bearing cap side bolts may appear to be coming from the oil cooler.
- If the oil cooler is leaking oil, remove the oil cooler from the engine. Use care to remove only the five bolts that hold the oil cooler to the engine block. Refer to the Engine Mechanical sub-section in the appropriate Service Manual.
Parts Information
Part Number
| Description
| Qty
|
88861417 (US)
88861418 (Canada)
| Sealant
| 1
|
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
| Description
| Labor Time
|
J7526*
| Cooler, Engine Oil (Auxiliary) - Replace
| 1.5 hrs
|
* This Labor Operation Number is for Bulletin use only. This number will not be published in the Labor Time Guide.
|