C 3500 Truck 2WD V8-6.6L DSL Turbo VIN 1 (2002)
Oil Cooler: All Technical Service Bulletins
Engine - Oil Leaks From The Oil Cooler
TECHNICAL
Bulletin No.: 02-06-01-023F
Date: March 31, 2008
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(R) Diesel Engine (VINs 1, 2 - RPOs LB7, LLY)
Supercede:
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 0-rings.
Correction
1.
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.
2.
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.
