Category: Lmm duramax

It was very similar to the LBZbut it featured an all-new emissions device, a diesel particulate filter. While it reduced emissions output drastically, the DPF system on the LMM resulted in these trucks having terrible fuel economy.

This is mainly because of the post-injection regeneration method used. You can find everything you need to know about this truck in our LMM Duramax specifications chart below. LMM Duramax Towing specifications vary according to year, cab configuration, and more. If you have a rear wheel drive truck your tow capacity will be slightly higher. Dually models will also have much better overall towing capacity.

Maximum conventional tow capacity for the 6. When equipped with a properly equipped dually, the LMM is capable of towing 16, lbs with a fifth-wheel hitch.

lmm duramax

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LML Duramax Emissions.

lmm duramax

LML Duramax Problems.The 6. This engine was initially installed in Chevrolet and GMC trucks, and has been an option since then in pickups, vans, and medium-duty trucks. Inproduction at Moraine was reportedly limited to approximatelyengines per year. RPO LB7 engine code "1" was first introduced in and continued until early It is a valve design with high-pressure common-rail direct injection and an experimental composite design cylinder head.

The most common issue with the LB7 is injector failure, so common that a special policy bulletin was issued B. Fuel leaked and entered the crankcasecausing oil dilution. Early on, customers came forward complaining of severe overheating, and in some situations, blown head gaskets.

Initially GM denied it was a problem, but after being sued by a consumer group, GM relented and included overheating and blown head gaskets as a warranted item. It is a valve design with high-pressure common-rail direct injection and aluminum cylinder heads. To meet this goal, they turned to a newly developed Garrett turbocharger with a variable geometry vane system and installed an EGR Valve.

6.6L Duramax LMM

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, saving significant labor costs if injector replacement became necessary. The first is VIN 2 produced in late and early The second is VIN D.

This was introduced in and continued into sold only in the "classic" body style. It has an improved engine computer tune that produces increased power and torque over the LLY version of the engine. The LMM engine code "6" debuted part way through and ended production with the start of the calendar year and is mated to the 6-speed Allison transmission.

The LMM was the only Duramax offered for model years — It is 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, were also improved to enhance durability even further.

The LML engine was significantly updated for to provide improved exhaust emissions that comply with the new federal emission standards for diesel engines, provide better engine rigidity and further noise reduction. This engine has a fuel injector in the exhaust tract, to allow raw fuel injection during the particulate filter recycling routine.The release of the Beginning January 1,new emissions standards were put in place that would forever change th Search Cart 0.

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Lighting Shop Now.View Cart Checkout. The 6. GM was the first of the manufacturers to make this jump and gave GM an added advantage in the diesel truck market. The common rail term comes from the fuel rail that is shared by all injectors. GM extended the warranty on the injectors tomiles due to failures that were widespread. 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. 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. Search By Manufacture. Call for Pricing. Your Shopping Cart will be saved and you'll be given a link. You, or anyone with the link, can use it to retrieve your Cart at any time.

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Your cart email sent successfully :.It makes use of the same I-beam connecting rods and cast-aluminum pistons, features the same Our LML Duramax power recommendations come your way next. A free-flowing exhaust system is instrumental in getting the most performance possible out of your LMM.

It offers you the ability to keep tabs on virtually every parameter the ECM monitors, which includes rail pressure, boost and transmission temperature, to name a few.

The price listed here includes the optional expandable exhaust gas temperature EGT probe kit, which we highly recommended to anyone running performance-oriented tuning. Most Allison builds come with a billet front cover, triple disc torque converter, upgraded clutches, custom frictions and steels, an upgraded valvebody with fresh solenoids, a modified pump and all new bearings and seals. Like all the Duramax engines that came before it, the LMM is also void of a lift pump in stock form.

The compact, all-inclusive, bolt-on fuel supply system from AirDog pictured here flows gallons per hour at 8 to 10 psi, which easily supports rwhp and as much as rwhp.

6.6L Duramax LMM

With a built Allison in the mix, getting the most out of the stock injectors, CP3 and turbo can be achieved through custom EFI Live tuning. Because the turbo and engine will see plenty of heat in a rwhp tune, a freer flowing downpipe provides a quicker exit path for those toasty exhaust gasses. A cold air intake is a great way to pull additional oxygen into the compressor side of the turbo.

On top of that, most systems can be had with a serviceable, oiled air filter option that can be reused. Aftermarket variable geometry turbochargers offer the best of all worlds: tame street manners, great transient response at lower engine speeds and optimum flow at high rpm for making big power.

Most aftermarket VGTs are treated to either a billet or forged milled wheel FMW compressor wheel, a higher flowing turbine wheel on the exhaust side and degree thrust bearings for utmost longevity.

lmm duramax

Not only does the factory Y-bridge choke down airflow, but its two-piece design lends itself to pesky boost leaks and it can even blow apart in extreme conditions. A set of balanced injectors upgraded with nozzles that measure percent larger than stock can easily push an LMM beyond rwhp with a larger variable geometry turbo on board.

With well-crafted EFI Live tuning namely less injector duration and timingthe factory CP3 can maintain rail pressure in a performance tune and as much as rwhp can be made. Things to Keep in Mind: Beyond simple bolt-ons—and due to the common-rail injection system—chasing horsepower with these trucks can be fairly expensive. Like all Duramax-powered GMs, the Allison transmission will need to be upgraded early on in the modification process, namely if you plan to expose it to rwhp or more on a regular basis.

As such, the labor to have these parts installed has purposely been excluded. Recommended For You. Threshold for Pain: Duramax Edition.Like its competitors, a diesel particulate filter DPF system had to be adopted by the Duramax in order to meet Federal emissions regulations in the U.

LMM (2007.5-2010)

GM reports that this engine and its adopted emissions technologies were able to cut particulate emissions by up to 90 percent over previous generations. The backlash of the DPF system was a severe reduction in fuel economy resulting from periodic regeneration cycles required to clean the particulate filter and prevent clogging.

The new diesel particulate system required "active regeneration" in order to periodically clean the DPF by means of literally burning the collected material. The LMM used a less favorable late and post injection technique in order to introduce raw diesel fuel into the diesel particulate filter, which is necessary to inhibit the high temperatures necessary for regeneration to occur.

The late and post injection technique, as opposed to the "9th injector" technique, poses the threat of cylinder washing and fuel dilution as a result of raw diesel fuel passing through the cylinder on its journey to the exhaust system.

The "9th injector" system, which would be adopted by the current LML Duramax, is considered favorable and eliminated these concerns. The typical response to abnormally high fuel dilution is to make sure that maintenance is performed regularly per the owners manual. The threat has yet to surface as a serious cause for concern, at least in the short run, despite criticism.

Budget Diesel Mods: LMM Duramax

A manual transmission was never offered with the LMM, and therefore every engine on the road is backed by the Allison six speed automatic. Though manual transmissions have never been particularly popular with Duramax buyers, there are those that wish the stick shift option would not have disappeared. Ford would continue to offer a six speed manual through the model year, and Ram Trucks still offers a manual transmission - although at a serious reduction in torque output.

Detuning is common in commercial vehicles. Engine Dimensions:.Increased emission regulations began to alter the diesel landscape significantly in For GM, an updated version of the 6. Basically an LBZ saddled with an intricate exhaust after treatment system, the LMM remained architecturally similar to the Duramax mills that preceded it. Despite the added complexities of the new emissions control system, GM was still able to increase power output and remain a step ahead of Ford and Dodge.

The LMM Duramax brought hp and lb-ft of torque to the table along with its emissions equipment, including exhaust gas recirculation, a diesel oxidation catalyst and a diesel particulate filter. Its bore of 4. As is the case with most modern diesel engines, emissions-control devices account for the majority of premature failures.

Duramax LB7, LLY, LBZ, LMM, LML, L5P Explained!

The LMM is no different, with its labyrinthine-like exhaust after treatment also contributing to poor fuel economy, diluted engine oil and reduced long-term engine longevity. But outside of those shortcomings, the LMM came with several upsides. Fun fact: Every completed 6. In order to lower particulate matter emissions by 90 percent, the LMM came equipped with a diesel particulate filter DPF located down stream from the diesel oxidation catalyst DOC. To keep the DPF from becoming chock full of particulate matter, a process called regeneration takes place, which effectively incinerates most of the soot buildup within the DPF.

There are two forms of regeneration: active and passive. Passive regeneration occurs when the engine is producing sufficient heat to keep particulate matter low, such as in heavy towing or hauling situations. However, the fuel required to perform an active regeneration cycle which occurs about once every fillup or roughly every miles traveled is the primary reason why the LMM-powered trucks took a hit in fuel economy.

The color touchscreen monitor allows you to see when the truck is in regeneration mode, as well as watch the soot accumulation reading from the DPF measured in grams on the bottom right. This meant more exhaust gas recirculation EGR would be necessary on the LMM, which called for a larger EGR cooler for increased cooling capacity and operational lifespan. The first step in trouble-shooting a leaking EGR cooler is often noticing that the engine is consuming coolant.

The name of the game in meeting particulate matter emission standards is to maintain sufficient heat in the engine. This means the engine needs to be under some sort of load at all times, and the intake airflow valve i. However, at idle, in stop-and-go traffic and cruising on the highway, EGT tends to drop considerably.