6.6-Liter LMM Duramax Engine
The Duramax Engine is a General Motors diesel engine family for light to medium duty trucks. The 6.6-liter LMM 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 LMM 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 LMM 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 LMM 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 early 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.
Cylinder Heads & Valetrain
Assembled in the USA.
All the internal wearable parts such as bearings, gaskets, pistons are replaced with New.
Cylinder Blocks and Cylinder Heads are magna-flux tested to avoid micro fractures.
Cylinders are bored back to Original Equipment Specs, or sleeved.
100% Standard sized crankshafts are used in these engines, no reground and re nitrated.
Cylinder heads get new valves and are vacuum tested to ensure the quality of the valve job. All heads are then pressure tested.
Connecting rods have new bushings installed and both large and small end are re machined to OEM specifications and gram weight.
New high pressure GM oil pumps are used for durability
Core plugs are 100% stainless steel to avoid corrosion.
100% internal wear components including rings, bearings, bushings, gaskets and seals.
Engine: 6.6L Duramax LMM, 90 degree V8 diesel
Years Produced: 2007.5 – 2010
VIN Code: 6 (8th digit of VIN)
Displacement: 403 cubic inches, 6.6 liters
Head/Block Material: Aluminum cylinder heads, cast iron engine block
Compression Ratio: 16.8 : 1
Firing Order: 1-2-7-8-4-5-6-3
Bore: 4.06 inches
Stroke: 3.90 inches
Aspiration: Turbocharged & intercooled – Garrett variable vane turbocharger (VVT), air-to-air intercooler
Injection: 26,000 psi Bosch high pressure common rail with CP3 injection pump
Valvetrain: OHV (overhead valve), 4 valves per cylinder
Oil Capacity: 10 quarts with filter
Engine Weight: Approximately 835 lbs
Max Engine Speed: 3,450 rpm
Emissions Equipment: • Diesel Particulate filter (DPF); minimizes particulate emissions • Exhaust gas recirculation (EGR); reduces NOx emissions • Diesel oxidation catalyst (DOC); converts carbon monoxide into CO2 & water
Peak Horsepower: 365 hp @ 3,100 rpm
Peak Torque: 660 lb-ft @ 1,800 rpm
The 6.6-L Duramax Bare Long Block Engines come with a 18 Month Unlimited Mileage 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.