The Duramax LB7, LLY, LBZ, LMM and LML remanufactured diesel engines are available at Roadmaster Engine World. This duramax 6.6l diesel engine is only $4375 exchange. Many of our customers request the ARP head studs. We can remanufactured these Duramax engines with the ARP studs for an additional $650.
Duramax 6.6l Diesel Engine
The Duramax 6.6l diesel engine is a General Motors diesel engine family for light- and medium duty trucks, designed by Isuzu. Duramax 6.6l diesel engine is produced by DMAX, a joint venture between GM and Isuzu in Moraine, Ohio. Initially this engine was installed in 2001 model year Chevy and GMC trucks. It has been an option since then in pickups, vans, and medium-duty trucks. In 2006, production at Moraine was reportedly limited to approximately 200,000 engines per year. On May 9, 2007, DMAX announced the production of the 1,000,000th Duramax 6.6l diesel engine at its Moraine facility.
LB7
RPO LB7 (engine code “1”) was first introduced in 2001 and continued until mid 2004. It is a 32-valve design with high-pressure common-rail direct injection and an experimental composite design cylinder head. Consequently the most problematic issue with the LB7 is injector failure. Fuel leaked and entered the crankcase, causing oil dilution. Furthermore, customers came forward complaining of severe overheating, and in some situations, blown head gaskets. Seems like GM denied it was a problem, but after being sued by a consumer group. Finally GM relented and included overheating and blown head gaskets as a warranted item. Also, GM issued a warranty for this after the fact for injectors, which now have 7 year/200,000 mile coverage.
LLY
The LLY (internally called the 8GF1) (engine code “2”) is a 6,599 cc turbocharged engine which debuted in mid-2004 and continued until the end of 2005. It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads. The LLY was GM’s first attempt to implement emissions requirements on their diesel trucks. So to meet this goal they turned to a newly developed Garrett turbocharger with a variable geometry vane system. Also they installed an Exhaust Gas Recirculation valve or (EGR Valve). Learning from problems with injectors in the previous LB7 GM changed the valve covers to allow access to the injectors without having to remove the valve covers. Relevantly saving significant labor costs if injector replacement became necessary.
LLY/LBZ
The 2006 LLY (engine code “2”) debuted in the beginning of 2006 and ended production with the start of the 2007 calendar year. Mechanically it is identical to the LBZ and is mated to the new 6-speed Allison transmission. However it retained the LLY designation.
Sold only in the “classic” body style the LBZ (engine code “D”) debuted in late 2006 and continued into 2007. It has a more powerful tune loaded into the computer that allows it to produce more power and torque.
Changes include:
- Cylinder block casting and machining changes strengthen the bottom of the cylinder bores to support increased power and torque
- Upgraded main bearing material increases durability
- Revised piston design helps lower compression ratio to 16.8:1 from 17.5:1
- Piston pin bore diameter increased for increased strength
- Connecting rod ” I ” section is thicker for increased strength
- Cylinder heads revised to accommodate lower compression and reduced cylinder firing pressure
- Maximum injection pressure increased from 23,000 psi (1,585.8 bar) to more than 26,000 psi (1,792.6 bar)
- Fuel delivered via higher-pressure pump, fuel rails, distribution lines and all-new, seven-hole fuel injectors
- Fuel injectors spray directly onto glow plugs, providing faster, better-quality starts and more complete cold-start combustion for reduced emissions
- Improved glow plugs heat up faster through an independent controller
- Revised variable-geometry turbocharger is aerodynamically more efficient to help deliver smooth and immediate response and lower emissions
- Air induction system re-tuned to enhance quietness
- EGR has larger cooler to bring more exhaust into the system
- First application of new, 32-bit E35 controller, which adjusts and compensates for the fuel flow to bolster efficiency and reduce emissions”
LMM
Debuted part way through 2007 the LMM (engine code “6”) and ended production with the start of the 2011 calendar year. And this LMM was mated to the 6-speed Allison transmission. The LMM was the only Duramax 6.6l diesel engine offered for model years 2008-2010.
Diesel Oxidizing Catalyst
Where the fuel is burned to elevate the temperature of the exhaust. While hot exhaust flows into the DPF and burns the trapped soot.
LML
Finally, the Duramax 6.6l diesel engine is the latest version (2011-present) of the Isuzu/GM Duramax V8 diesel engine. Actually a further advanced version of the LMM engine with the majority of the changes addressing a required drastic reduction in engine emissions. Some mechanical aspects of the engine, such as piston oil flow design for improved temperature control and oil pump design. Additionally were also improved to enhance durability even further.
Significantly updated was the LML Duramax 6.6l diesel engine for 2011. Providing improved exhaust emissions that comply with the new federal emission standards for diesel engines. Furthermore providing better engine rigidity and further noise reduction. New piezo injectors, a complete fuel system-hardening to tolerate up to 20% biodiesel mixtures. This duramax 6.6l diesel engine has a fuel injector in the exhaust tract, to allow raw fuel injection during the particulate filter recycling routine.
DURAMAX VIN CHART
| Model Year(s) | 8th Digit of VIN | Duramax Model & Notes |
| 2001 – 2004 | 1 | LB7 |
| 2 | LLY (introduced midyear 2004) | |
| 2005 | 2 | LLY (only engine offered for 2005) |
| 2006 | 2 | LLY (2006 version, different from 2005 version) |
| D | LBZ (introduced late 2006) | |
| 2007 | D | LBZ |
| 6 | LMM | |
| 2008 – 2010 | 6 | LMM (only Duramax offered during these years) |
| 2011 – 2016 | 8 | LML |
| L | LGH | |
| 2017 | Y | L5P |
Roadmaster Engine has been rebuilding diesel engines since 1953. You can trust that the Duramax 6.6l diesel engine will be the correct engine and one you can depend on.
Satisfaction and peace of mind is what you experience when buying from Roadmaster. You won’t find better customer service and the thoroughness we offer to make sure what you’re looking for is correct. We know that’s what you expect. Buy from Roadmaster and you won’t be disappointed.
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