Just like the previous years, the 2006-2007 GM 2500HD/3500HD models came equipped standard with a Vortec 6.0L gas engine and offered two optional engine choices, the 8.1L big block or the 6.6L Duramax LBZ. Water pump failure is not always due to the plastic impeller, many fail due to a bad pump seal. Even with some inherent issues, most plastic impeller water pumps can still manage to last between 150,000 to 200,000 miles. The impellers are pressed onto the pump’s steel shaft and can spin on the shaft causing overheating issues. Plastic water pump impellers were introduced on late model LLY engines and came equipped on the LBZ as well. With limited or no travel in the unison ring, it will typically lead to poor drivability and a significant decrease in power. It typically happens when corrosion and carbon accumulation cause the unison ring to seize. Similar to what many Ford 6.0L Powerstroke owners experience, the Garrett GT3788VA VVT is known for turbo vanes that can get stuck.
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The pistons typically cracked along the centerline of the wrist pin. Most failures occur in engines where larger injectors and turbo have been installed. The cast-aluminum pistons are prone to cracking, especially when the power level is increased. Whereas the rods were the weak link in the LB7 and LLY mills, things were reversed in the LBZ. The vans featured a slightly detuned version of the Duramax diesel and were only offered with a GM 4L80E/4L85E 4-speed automatic. The LBZ was the first Duramax diesel to be offered in the Chevrolet Express and GMC Savana 2500/3500 vans.
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The 2007.5 Duramax LMM was not available with a manual transmission. The ZF650 6-speed manual transmission was still available, but the diesel market started to favor automatic transmissions and 2007 was the last year a Duramax diesel engine was offered with a manual transmission. The LBZ was the first Duramax to be coupled to the 6-speed Allison 1000 automatic, which proved capable of handling more power than the five-speed version that preceded it. The combination of new mechanical components and an upgraded ECM made the 2006-2007 Duramax LBZ the most reliable, durable, and powerful Duramax up to that point. This was also the first application to use a new 32-bit E35 controller, which adjusts and compensates for the fuel flow to bolster efficiency. A larger turbocharger inlet manifold was added to help lower intake and exhaust temperatures while improving responsiveness from the Garrett GT3788VA variable-vane turbocharger (VVT). The Bosch solenoid-style fuel injectors were updated to a 7-hole nozzle that sprayed fuel directly onto the new fast-heat glow plugs when cold to provide faster start-up. The reliable Bosch CP3 injection pump was still used but maximum pressure increased from 23,000 psi to more than 26,000 psi. One of the main components to the increase in power was upgrades to the common-rail fuel system. New cast-aluminum pistons were also utilized to lower the compression ratio.
The I-beam style connecting rods featured more material in critical areas to increase their overall strength. The forged steel connecting rods with a cracked capped construction were similar to previous iterations but were reinforced to handle the increase in horsepower and torque. In addition, the engine internals were revised for additional durability. Minor changes were also made to the crankshaft, along with the use of a new reluctor wheel. Taller main bearing caps and deeper bores for the main cap bolts were also employed. Preparing for additional horsepower and torque, more webbing was now cast into the main bearing areas of the block. The cast-iron block received casting and machining changes to help strengthen the bottom of the cylinder bores. The solid foundation of a cast-iron block and aluminum heads were carried over, but they received numerous upgrades in 2006. The LBZ engine tuning resulted in a significant increase in horsepower and torque, with the power levels getting a bump to 360 hp and 650 lb-ft of torque, up from 310 hp and 605 lb-ft of torque in the LLY. The GM 6.6L Duramax engine was completely redesigned to enhance overall performance and reliability for 2006. The Duramax LBZ was introduced for the 2006 model year and eventually retired halfway through the 2007 model year but remains an extremely popular choice with diesel enthusiasts to this day. Posted on Januby Jeremy_XDP 0 History/General Info Buyers Guide, Duramax 2006-2007 GM 6.6L LBZ Duramax Buyer’s Guide
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