LML Duramax Engine Complete Long Block

Remanufactured 6.6-Liter LML Duramax Engine – Complete Long Block – Built to Factory New Specifications with Updates – Diesel Experts

SKU: LML Complete Long Block Categories: ,

Product Description

6.6-Liter LML Duramax Engine

The Duramax Engine is a General Motors diesel engine family for light to medium duty trucks. The 6.6-liter LML 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 LML 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 LML 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 LML 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.

Additional Information

Weight 835 lbs
Dimensions 48 x 48 x 40 in

2010, 2011, 2012, 2013, 2014, 2015


Chevrolet, Duramax, GMC


Kodiak C4500, Kodiak C5500, LB7, LBZ, LLY, LML, LMM, Sierra 2500HD, Sierra 3500HD, Silverado 2500HD, Silverado 3500HD, Topkick C4500, Topkick C5500

Engine Size


Whats Included

The 6.6L Duramax Complete Long Block includes:

Cylinder block

Cylinder heads

Front cover

Water pump

Oil pan

Oil cooler assembly

Oil filter assembly

Flywheel housing

Oil level sensor

Vibration damper

Misc. gaskets


1. Installing all new head bolts on complete and running complete engines.

2. Installing NEW oil cooler on complete and running complete engines.

3. 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.

Technical Specs

Engine: 6.6L Duramax LML, 90 degree V8 diesel

Assembly Location: DMAX assembly plant in Moraine, Ohio

Years Produced: 2011 – current

VIN Code: 8 (8th digit of VIN)

Displacement: 403 cubic inches, 6.6 liters

Head/Block Material: Aluminum cylinder heads, cast iron engine block

Compression Ratio: 16.0 : 1

Firing Order: 1-2-7-8-4-5-6-3

Bore: 4.06″ (103 mm)

Stroke: 3.90″ (99 mm)

Aspiration: Turbocharged & intercooled – Garrett variable vane (VVT), variable geometry turbocharger (VGT) with air-to-air intercooler

Injection: Direct injection, 2000 bar (~30,000 psi) Bosch high pressure common rail w/ CP4 injection pump and piezo injectors

Valvetrain: OHV (overhead valve), 4 valves per cylinder, mechanical roller lifters

Oil Capacity: 10 quarts w/ filter (9.5 liters)

Fuel Compatibility: Ultra low sulfur diesel (ULSD) or max B20 biodiesel blend

Max Shift RPM: 3,000 rpm

Peak Horsepower: 397 hp @ 3,000 rpm

Peak Torque: 765 lb-ft @ 1,600 rpm


The 6.6-L Duramax Complete Long Block Engines come with a 1 Year 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.