6.6-Liter LB7 Duramax Engine
The Duramax Engine is a General Motors diesel engine family for light to medium duty trucks. The 6.6-liter LB7 Duramax Engine is produced by DMAX, a joint venture between GM and Isuzu in Moraine, Ohio. The Duramax Engine was released in late 2001 into the Chevrolet and GMC chassis vehicles. The LB7 Duramax Engine was replacing the old 6.5-L Detroit built engine which was a big jump forward in technology. GM was the first of the manufacturers to make this jump and gave GM an added advantage in the diesel truck market. The LB7 Duramax Engine utilized the new Bosch Common Rail Fuel system. The early fuel systems included an ECM (Engine Control Module), CP3 Injection pump, FICM (Fuel Injection Control Module), and injectors. The later version fuel system did away with the FICM and utilize a CP4 injection pump. The common rail term comes from the fuel rail that is shared by all injectors.
The LB7 Duramax Engine had some issues that appeared not too long after initial release. GM extended the warranty on the injectors to 200,000 miles due to failures that were widespread. Changing the injectors on the LB7 Duramax was a little time consuming since they were located under the valve cover. Air bubbles in the fuel lines turned out to be the cause for the premature failure of the injectors. When these air bubbles were present in the fuel line they accumulated in the CP3 pump. When the injector went to fire the bubble would get between the injector plunger and the injector tip. With the bubble there the injector plunger has no fluid damping when it comes into contact with the injector tip causing a small gap to form over time. Once that gap grows large enough fuel is allowed to flow through continuously since the rail is pressurized so high. The computer system was unable to determine if this is happening so the check engine light would not notified the driver. The only way to determine if this was happening was to measure the return fuel flow rate.
Aftermarket companies like AirDog & FASS came up with the solution to the injector failures called a Fuel Air Separation System. Once one of these systems was added to the vehicles they proved to extend the life of the injectors to around 400,000 miles according to many “hot shot” drivers & fleet vehicle owners.
The 6.6L Duramax, running complete engine includes the
Oil pump & pan
Thermostat & thermostat housing
Common rail system with injectors
Injector drive module
Sensors: cam position sensor, crank position sensor, fuel temperature sensor, water temperature sensor, fuel pressure sensor, boost pressure sensor, oil level sensor, (and oil pressure sensor where applicable).
1. Injectors are upgraded to the latest style available from GM/Isuzu.
2. Installing all new head bolts on complete and running complete engines.
3. Installing NEW oil cooler on complete and running complete engines.
4. Incorporating all available GM/Isuzu factory upgrades to our remanufactured engines, including head gaskets, torque specs, etc.
Assembled in the USA.
Blocks and crankshafts are 100% magnaflux tested to avoid cracked components.
Aluminum cylinder heads are dyed to check for cracks.
Crankshaft is checked for size and micro-polished to OEM specifications. If necessary, it is re-ground re-nitrated and micro-polished to OEM specifications.
Connecting rods have new bushings installed and both large and small end are remachined to OEM specifications.
All connecting rods are de-magnetized.
All heads get new valves and are vacuum tested to ensure the quality of the valve job. All heads are pressure tested.
Core plugs are 100% stainless steel to avoid corrosion.
100% internal wear items including rings,bearings, bushings, gaskets and seals.
Engine:6.6L Duramax LB7, 90 degree V-8 dieselYears
Produced:2001 – 2004 model years
VIN Code:1 (8th digit of VIN)
Displacement:403 cubic inches, 6.6 liters
Head/Block Material:Aluminum cylinder heads, cast iron engine block
Compression Ratio:17.5 : 1
Aspiration:Turbocharged & intercooled – IHI turbocharger, air-to-air intercooler
Injection:Direct injection, Bosch 23,000 psi high pressure common rail with CP3 injection pump
Valvetrain:OHV (overhead valve), 4 valves per cylinder (32 valve)
Oil Capacity:10 quarts w/ filterEngine
Weight:Approx. 835 lbs
Max Engine Speed:3,250 rpm
Peak Horsepower:• 235 hp @ 2,700 rpm (2001 model year)• 300 hp @ 3,100 rpm (2004 model year)
Peak Torque:• 500 lb-ft @ 1,600 rpm (2001 model year)• 520 lb-ft @ 1,800 rpm (2004 model year)
The 6.6-L Duramax Complete Drop-in Engines come with a 2 Year Unlimited Mileage Parts Replacement Warranty on the engine Long block.
The remaining accessories come with a 1 Year Parts Replacement Warranty. Labor is covered at book rate times for manufacturing defects.
Shipping is handled via common freight carrier. Freight is calculated by zip code and weight of the engine round trip unless specified differently.