Should I take my Duramax head gasket failure to a shop?
Improving performance comes at the price of higher EGTs and drive pressures. These can result in premature head gasket failure, so be very careful when adding any aftermarket upgrades. If you experience head gasket failure on your LLY Duramax, it’s probably best to take your truck to a shop. Unfortunately, it’s going to be an expensive ticket.
What are the restrictions on a Duramax Turbo?
The main restriction is the turbo air inlet manifold. The LLY Duramax turbo air inlet manifold, sometimes called the turbo mouthpiece, forces the turbocharger to work harder than it needs to. It does this by essentially choking the turbo because of its small, restrictive design, forcing it to work harder to produce the same amount of boost.
What happens to a Duramax spring when it gets too weak?
After repeated use, the spring becomes weaker and weaker, until it gets to a point where it can no longer sustain even stock pressures. This part wears even faster on modified trucks or even just LLY Duramax trucks with a tuner.
What are some of the most common problems with the Duramax?
9 Common 6.6L LB7 Duramax Problems. 1 1. LB7 Duramax Injectors. The most notorious LB7 Duramax problem is their original injectors. Even GM acknowledged their problems when they corrected ... 2 2. Lack Of A Fuel Lift Pump. 3 3. Fuel Filter Housing O-Ring Leaks. 4 4. Water Pump Failures. 5 5. Overheating. More items
What year Duramax should I stay away from?
Quick Answer: Avoid Duramax Year Models 2001-2010 The Duramax has a long history. We recommend avoiding any GM vehicle equipped with the 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, and 2010 Duramax engines. In short, the newer model years show improved performance.
Is the 2006 Duramax a good engine?
Overall, the Duramax is an extremely reliable engine and is highly capable. Tuned and upgraded LBZ's will be less reliable without upgraded pistons and rings, but very rarely do either of these cause issues on stuck LBZ's. The LBZ's are widely regarded as the best and most reliable Duramax made.
What year Duramax has injector problems?
What year Duramax has injector problems? The LB7 Duramax built from 2001 – 2004.5 is known for injector failure. The good news is the replacement injectors you purchase from us incorporate several updates to help prevent repeat failures.
What are common Duramax problems?
Water Pump Problems Are Common These impellers are extremely weak and prone to failure. Water pumps on Duramax engines are also prone to leaking. These leaks can result in engine overheating issues. Water pump leaks also affect system pressure, which can result in coolant supply inadequacies.
Why are LBZ so sought after?
Despite the LBZ's short lifespan, it remains one of the most popular Duramax engines due to its power, dependability, and lack of strict emissions technology.
How long will a 2006 Duramax last?
Overall, a properly cared for Duramax engine should last over 300,000 miles. However, consumers report having Duramax's lasting in the 500,000-mile range!
How much does it cost to put new injectors in a Duramax?
The total cost for Duramax injector replacement is $2,000 and $6,000. The labor costs associated with this job can range from $800-$1,500. Related repairs could be needed if you have driven for a long time with dirty fuel injectors.
What are the signs of injector failure?
An abrupt loss of engine power is a somewhat obvious sign of a fuel injector failure. If the fuel injector is clogged, the fuel supply will be irregular too. When the fuel level fluctuates drastically, the high and low rpm's will cause the engine to move in surges rather than slow and gradual movements.
How long do injectors last on 6.6 Duramax?
For most buyers the first set of injectors will likely have already been taken care of since the failure usually occurs between 100,000 and 150,000 miles.
What is high mileage for a Duramax?
As for what's considered high mileage for specific diesel engines? According to Prosource Diesel, anything over 350,000-miles is considered high mileage for a used diesel pickup with a Cummins or Duramax engine under its hood. Anything over 350,000-miles is also regarded as high mileage for a Powerstroke diesel engine.
What is the most reliable Duramax engine?
LLY/LBZ from 2006 to 2007 is considered one of the most reliable and rugged engines from the pre-emission's era. They are widely sought out for because of this and can be a great buy if you are looking for a Duramax engine of this time.
How many miles will a Duramax diesel engine last?
A poorly-maintained engine can quickly fall into disrepair before it even reaches the 100,000-mile mark while a well-maintained Duramax pickup truck should last 400,000 or even 500,000 miles.
Can a magnesium pump leak?
Being that the pump housing is aluminum and is a harder material then the magnesium rear housing, it can wear a hole in the rear housing and cause a very small leak. This leak is high enough in the case that it typically will not leak when vehicle is not moving and therefor not leaving any drops on the ground.
Does it matter if you are in a 4x4?
It doesn't matter if you are in 4x4 or not the pump rub wear still occurs if the 4x4 is engaged or not. The Merchant fix is the best one out there.
What is the best post emission Duramax engine?
Just like the LBZ was the best pre-emissions 6.6 Duramax engine, the L5P is the best post-emissions Duramax. All the problems associated with emissions system and injection pump have been taken care of, and for 2017 GM switched suppliers of the injection pump from Bosch to Denso. Mechanically, the L5P Duramax is stout and very few major problems have been reported. One common problem is with the MAP sensor however, as it tends to clog with soot and throw a check engine light, but a simple MAP sensor spacer and a can of electrical cleaner can get you back on the road worry free and prevent the soot from building up again.
When was the Duramax V8 introduced?
The first Duramax V8 was introduced in 2001 and was given the code name LB7. The introduction of common rail injection powered by the Bosch CP3 injection pump made the LB7 Duramax stand apart from other diesels of the day with excellent power and efficiency. As the first batch of trucks started reaching the 100,000 mile mark, it became apparent there were some issues with the new engine, and one of the first symptoms exhibited would be a rough idle from the LB7, excessive smoke from the exhaust, long cranking times, and even fuel diluting the oil in the crank case.
What transmission is the LBZ Duramax?
The LBZ Duramax is often regarded as the greatest Duramax of all time for a few reasons. It was the first to come bolted to the six-speed Allison transmission which provides a lower cruising RPM and greater fuel efficiency when compared to the five-speed on the LB7 and LLY.
How many holes does a LBZ injector have?
The LBZ injector nozzle has seven holes for fuel to spray out of, but the LMM has six which means there are two opposed streams of fuel directly above the wrist pin area of the piston, which causes hot spots directly on top of the weakest area which can lead to cracking.
Where is the CP3 pump?
The CP3 injection pump sits in the valley of the engine between the cylinder heads and is driven by the camshaft gear, and it has two main jobs: get fuel from the tank up to the engine, and pressurize the fuel to 26,000psi and ultimately inject it into the engine.
What happens when a turbocharger is working hard?
When the engine is working hard, the turbocharger is drawing in a ton of air, and the restrictive stock turbo inlet tube can effectively choke the VGT turbocharger causing the compressor outlet temperature to skyrocket, heating up the intercooler, and ultimately raising the temperature of combustion and the coolant temp.
Can a map sensor clog?
One common problem is with the MAP sensor however, as it tends to clog with soot and throw a check engine light, but a simple MAP sensor spacer and a can of electrical cleaner can get you back on the road worry free and prevent the soot from building up again.
What are the issues with Duramax injectors?
The ball seat inside the injector can also become faulty over time. The ball seat can deteriorate over time, resulting in an incomplete seal, and ultimately, injector leaking. Both of these issues result in fuel leaking from the injector which can then enter the crankcase. This can lead to more serious problems, as diesel fuel doesn’t offer the same lubrication properties as oil. You’ll also experience loss of power, excessive smoke, rough idling, and engine misfiring.
How many miles does a LB7 Duramax head gasket fail?
Despite this, head gasket failure usually doesn’t occur until over 100,000 miles, so it’s not nearly as common as it is in 6.0L Powerstroke engines. LB7 Duramax head gasket problems can occur for a couple of reasons.
What studs should I use for LB7 head gasket?
The ARP Head Stud Kit 230-4201 should be used when doing an LB7 Duramax head gasket job. These studs offer the best clamping force and drastically better performance than comparable studs from other manufacturers.
What fuel injection system does a Duramax 6.6L use?
The 6.6L LB7 Duramax uses a high pressure common rail fuel system with direct injection. A major part of this fuel injection system is the CP3 fuel injection pump. While the CP3 has proven itself as reliable, it’s not only responsible for pressurizing the fuel before it’s sent to the injectors, but also for drawing fuel from the tank.
Why does my LB7 overheat?
Overheating issues typically occur because of a faulty water pump, or a damaged fan clutch. When the fan clutch is damaged, it prevents it from operating and giving the LB7 Duramax engine the additional cooling it needs. Overheating can also be attributed to a dirty or clogged radiator.
What transmission is used in a GM Duramax?
The Allison Transmission is well-known by diesel enthusiasts for being one of the most reliable transmissions ever. There is a reason GM has stuck with this transmission and continues to use them, even in today’s L5P Duramax. The original Allison wasn’t nearly as stout or beefy as more recent ones. In fact, when you tune your LB7 Duramax or add other performance modifications, the Allison 1000 transmission can enter limp mode. This occurs so often that we included it in our list of the most common LB7 Duramax problems.
Why does my Duramax crankshaft snap?
High horsepower Duramax trucks of all generations are susceptible to snapping a crankshaft. Excessively high RPMs and poor tuning have attributed to some crankshaft failures. Some people also blame the firing order for putting additional stress on the crankshaft. Breaks typically occur near the number one and two rod journals.