If your impeller breaks or goes bad, the coolant won’t flow through the engine. The impeller is like a little rotating fan that is responsible for actually forcing the coolant through the system. On the LBZ, and all Duramax engines for that matter, the impeller inside the water pump is made of plastic. The pump is responsible for pushing the engine coolant throughout the cooling system to prevent the engine from overheating. The water pump on any vehicle generally functions the same way. To prevent piston failure, your only option is to either not tune your LBZ or to upgrade the pistons and probably the rods to something forged. If you are looking to produce serious power, you’ll need to open your wallet. I will note that running a tune-only probably isn’t going to crack your pistons but it will obviously make it more likely to happen as any power increases will put additional stress on the engine internals. ![]() However, the pistons remained the same, produced purely from cast iron which is why they are prone to cracking at serious power levels. While the pistons have cracked before on totally stock engines, it’s highly unlikely and rare.ĭuramax strengthened the block and lower half of the LBZ to handle to stock performance increases over the previous LLY models. If you plan on keeping your engine purely stock, you can ignore this problem. The pistons on the LBZ are generally good up until around 600whp, levels beyond that are when piston failure becomes imminent. This “common problem” is really only common for folks pushing serious power. However, one common failure point on tuned LBZ’s is cracked pistons. With various upgrades, this engine is easily capable of producing over 600whp and 1,000lb-ft. The LBZ is revered for its tune-only performance capabilities. The LBZ and this engine problem guide are applicable to the following Duramax Chevy/GMC vehicles from 2006 to 2007:ĥ Most Common LBZ Duramax 6.6L Engine Problems However, the LBZ’s on the road today are getting up there in age and likely mileage as well so it’s important to consider the common LBZ engine problems prior to purchasing one. ![]() Overall, the Duramax LBZ is an awesome engine that is highly reliable and capable from a performance perspective. The engine was phased out in 2007 solely for the purpose of emissions regulations. When you couple the performance potential with the reliability, and lack of emissions regulating systems, it’s no wonder the LBZ is still the fan favorite over 13 years since its discontinuation. Because of this, the LBZ is a favorite amongst diesel enthusiasts because of its bolt-on mod performance capabilities. To support the power increase over the LLY model, the block was improved, the rods were forged, and the engine was overall built to withstand more power. Produced from 2006 to 2007, the shortest production Duramax, the LBZ produced 360hp and 650lb-ft. Instead, it developed two new small-displacement Duramax engines – the 2.8L I4 LWN (XLD28 in international markets) and the 3.0L I6 LM2.The LBZ Duramax is, still today, the favorite Duramax of diesel enthusiasts. However, after fully completing development of the engine, GM decided not to produce it due to reasons associated with the “economic climate”. After that, the automaker considered several times to put the 4.5L Duramax into production, but never did. The motor, sometimes referred to as Baby Duramax, was slated to be offered in GM’s light duty pickup trucks – the Chevrolet Silverado 1500 and GMC Sierra 1500 – for the 2010 model year. ![]() It was report to have been rated at 310 horsepower and 520 pound-feet of torque while meeting all modern emissions requirements. Not produced, originally planned for Sierra 1500įrom what we know, one Duramax engine was developed but was never put into production.ĭeveloped entirely in-house by GM and assigned RPO Code LMK, the engine displaced 4.5 liters from a V8 layout. Not produced, originally planned for Silverado 1500 ![]() GM Duramax Turbo Diesel Engines Engine RPO Codeĭirect injection, high pressure common-railĢ50 - 360 / 190 - 270 - 650 / 624 - 881 Silverado HD, ExpressĢ50 - 365 / 190 - 272 - 660 / 624 - 895 Silverado HD, ExpressĬolorado/S-10, TrailBlazer (International Markets)
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