Savana 4500 V8-6.6L DSL Turbo (2009)
Diesel Emissions Fluid (DEF) System: Technical Service Bulletins
Emissions - EGR Cooler Pressure Tester Adapter
INFORMATION
Bulletin No.: 08-06-04-003B
Date: April 18, 2011
Subject: New Tool Availability - EN-48974 - EGR Cooler Pressure Tester Adapter Set to Diagnose Duramax(TM) Diesel Engine EGR Cooler Engine
Coolant Leaks into Combustion Chamber
Models:
2002-2012 Chevrolet Silverado
2004-2009 Chevrolet Kodiak C4500-C5500 Series
2006-2012 Chevrolet Express Vans
2002-2012 GMC Sierra
2004-2009 GMC TopKick C4500-C5500 Series
2006-2012 GMC Savana Vans
Equipped with 6.6L Duramax(TM) Diesel Engine (VINs 1, 2, D, 6, L, 8 - RPOs LB7 (CA Emissions), LLY, LBZ, LMM, LML, LGH)
Please Refer to GWM/IVH
Attention:
The graphics contained in this bulletin for clarity show the EGR cooler connections to J-46091 and EN-48974 on a workbench. The connections are the
same with on-vehicle service.
Supercede:
This bulletin is being revised to add supplemental kit EN-48974-20, 2011-2012 model year vehicles, add graphics and update the EGR cooler testing
information. Please discard Corporate Bulletin Number 08-06-04-003A (Section 06 - Engine/Propulsion System).
An EGR Cooler Pressure Tester Adapter Set, EN-48974, was shipped essential to dealers in December 2007 to diagnose EGR cooler engine coolant
leaks on all Duramax(TM) engines equipped with an EGR system. This adapter set is designed to be used with J-46091-1 - Charge Air Cooler Tester
Regulator to pressurize the EGR cooler with shop air and monitor it for leakage.
Important
Leaks from the EGR cooler may allow coolant to pass through the exhaust system and enter the combustion chambers on the right bank
cylinders. Failure to inspect the EGR cooler for leaks may lead to a misdiagnosis for coolant in the combustion chamber.
EN-48974 - EGR Cooler Pressure Tester Adapter Set
544259 (Qty 2) 19 mm (3/4 Inch) Hose Clamps
EN-48974-3 (Qty 1) 19 mm (3/4 Inch) EGR Cooler Hose Adapter
EN-48974-4 (Qty 1) 19 mm (3/4 Inch) Cap Plug
EN-48974-1 (Qty 1) 15.9 mm (5/8 Inch) EGR Cooler Hose Adapter
EN-48974-2 (Qty 1) 15.9 mm (5/8 Inch) Cap Plug
544258 (Qty 2) 15.9 mm (5/8 Inch) Hose Clamps
In December 2010 another supplement to the EGR Cooler Pressure Tester Adapter Set, EN-48974-20, was shipped essential to dealers to diagnose EGR
cooler engine coolant leaks on all 2010-2011 Duramax(TM) 6.6L engines equipped with multiple cooler EGR system. This supplement gives the test
adapter set a larger variety of sizes to accommodate the newer style coolers that have multiple ports.
