Exhaust system for Nissan Murano the second generation (Z51 body) is a complex engineering unit, where the exhaust pipe plays the role of a connecting link between the engine and the rest of the muffler. This part is subjected to enormous thermal and vibration loads, which inevitably leads to its degradation over time. For crossover owners, understanding the operating principles of this system is critically important, since malfunctions here directly affect the environmental friendliness, noise and power of the car.
Many car owners are faced with the problem of rust or destruction of welds in the collector area. Ignoring symptoms, such as extraneous noise under the hood or the appearance of an exhaust smell in the cabin, can lead to serious damage to the oxygen sensors and catalyst. The correct approach to repair requires not only replacing the part, but also understanding the design features of the specific year of manufacture of your Nissan.
Design features of the Murano Z51 exhaust system
Exhaust system Nissan Murano Z51 designed taking into account the specifics of the V6 VQ series engines. The downpipe, or “pants,” in this model is often made of high-strength steel, but even it is not immune to corrosion due to the aggressive environment and temperature changes. The main design feature is the presence of an integrated catalytic converter in some trim levels or its close location to the manifold, which requires special care when dismantling.
It is important to note that exhaust configurations may vary from market to market. For example, European versions are often equipped with a more complex cleaning system, including particulate filters, while American models may have a simplified design. The receiving pipe is connected to the manifold flange through a gasket, which becomes brittle over time and loses its sealing properties. This is where sealing problems most often arise.
The vibration load from the V6 engine is transferred directly to the pipe, which can lead to metal fatigue. If you notice that you hear a characteristic knock or whistle when starting the engine, this is the first signal that the connection has become depressurized. Condition of supports The muffler also plays a role in maintaining the integrity of the pipe, since excess play accelerates the destruction of welds.
- 🛠️ Material of manufacture: high-alloy steel with heat-resistant coating.
- 🔧 Connection unit: flange mount with gasket made of composite materials.
- ⚙️ Integration: the presence of lambda probes before and after the catalyst near the pipe.
⚠️ Attention! On models with VQ35DE and VQ35HR engines, the exhaust gas temperature in the downpipe area may exceed
800°C, which requires the use of special heat-resistant gaskets during repairs.
Main symptoms of malfunction and diagnostic methods
A problem with the exhaust pipe can be identified by a number of characteristic symptoms that become noticeable already in the early stages of wear. The most obvious sign is a change in the sound of the engine. If, instead of the usual dull hum, you hear a sharp metallic knock when cold or a whistle at high speeds, it means that the seal is broken. This sound often occurs due to air leaks at the junction of the collector and pipe.
The second important indicator is the appearance of the smell of exhaust gases in the car's interior, especially when driving in a traffic jam or idling. This is not only uncomfortable, but also dangerous to health, as carbon monoxide can enter the ventilation system. In addition, modern engine management systems Nissan instantly react to changes in pressure in the outlet and can light up the indicator Check Engine with error codes for lambda probes.
A visual inspection can also help identify problems. Inspect the pipe for signs of soot at the joints, rust or cracks. If you see black spots around the flange, this is a sure sign that the gasket has burned out or the flange has become warped. Corrosion can start from the outside, but most often the destruction occurs from the inside due to condensation and acids formed during fuel combustion.
- 🔊 Abnormal noise: whistling, clicking or knocking when starting and running the engine.
- 👃 Smell: the feeling of exhaust gases in the cabin or near the hood.
- 📉 Errors: code P0420 (low catalyst efficiency) or P0130-P0167 (problems with sensors).
- Every maintenance
- Only when there is noise
- Never checked
- Once every 2-3 years
⚠️ Attention! Do not try to plug a leaky pipe with sealant or fiberglass tape - this is a temporary solution that can lead to overheating of adjacent elements of the engine compartment and even a fire.
Comparison of repair options: welding or complete replacement
When a malfunction is detected, the owner Nissan Murano Z51 A choice arises: restore the old part or install a new one. Welding the intake pipe is a more budget-friendly option, which is suitable in cases where the metal has not yet been completely destroyed, but only the seam is damaged or there is a small crack. However, the quality of welding directly depends on the qualifications of the craftsman and the equipment used. Conventional electric welding will not work here; you need argon or a semi-automatic welding machine in a shielding gas environment.
A complete replacement with a new original part or a high-quality analogue is a more reliable solution. New pipes are manufactured to all factory tolerances and are properly coated to protect against corrosion. This is especially true for those who plan to use the car for several more years. The cost of the original spare part is much higher, but you get a guarantee against leaks and compliance with environmental standards.
There are also options for installing universal pipes that are customized to fit your location. This is a compromise option that allows you to save money, but requires high precision during installation. An incorrectly installed universal pipe can create unnecessary vibrations or distortions, which will lead to rapid failure of adjacent elements of the exhaust system. Geometry the exhaust system must be perfect.
| Parameter | Welding an old pipe | Installation of a new original | Universal pipe |
|---|---|---|---|
| Cost of work | Low | High | Average |
| Service life | 6-12 months | 3-5 years or more | 1-2 years |
| Risk of errors | High (depending on the welder) | Minimum | Medium (fit) |
| Ecology | Not guaranteed | Full compliance | Depends on quality |
☑️ Diagnostics before choosing a method
⚠️ Attention! When choosing welding, be sure to check whether the master uses argon welding. Conventional electrode welding on a thin-walled pipe will burn through the metal and will not provide the required strength at high temperatures.
The process of removing and installing the exhaust pipe
Dismantling and installation of the intake pipe on Nissan Murano Z51 - This is a labor-intensive procedure that requires a lift or overpass. Work begins with disconnecting the battery to avoid short circuits if the terminals are accidentally touched with tools. Then you need to loosen the clamps and fastening bolts, which often stick due to corrosion. It is recommended to pre-treat all threaded connections with a penetrating lubricant such as WD-40 or an analogue and give them time to settle.
It is critically important to carefully disconnect the connectors of the lambda probes located on the exhaust pipe. Sensors are often located in hard-to-reach places and can be damaged if handled roughly. Before removing the pipe, you need to remember or photograph the location of all fasteners and gaskets. Sometimes you have to remove the heat shield to gain access to the manifold mounting bolts, which adds time to the job.
Installing a new pipe requires careful preparation. New bolts and gaskets must be installed, as old ones are often deformed and do not provide a tight seal. When tightening the flange connection bolts, the tightening torque must be observed so as not to strip the threads or deform the flange. The tightening sequence usually goes from the center to the edges to ensure even pressure on the gasket.
- 🔑 Tools: socket set, torque wrench, penetrating lubricant.
- 🛡️ Protection: heat-resistant gasket and new fasteners.
- 📏 Control: checking the gaps between the pipe and the body/suspension.
What to do if the bolts are stuck?
If the bolts do not come off, do not use excessive force to avoid stripping the threads on the manifold. Use a gas torch to locally heat the bolt, alternating between heating and attempting to remove it. In extreme cases, the bolt may need to be drilled out, which will make repairs much more difficult.
Before installing a new gasket, clean the flange surfaces with a wire brush and degrease them to ensure maximum sealing of the joint.
Selection of spare parts: original or analogues
The auto parts market offers many options for replacing the exhaust pipe with Nissan Murano Z51. An original part from the manufacturer guarantees a perfect fit in size and materials, but its price often scares off owners. The original part number usually begins with the prefix 14000, and you need to look for it by the car’s VIN code, since the configuration may vary depending on the year of manufacture and the sales market.
Analogues from well-known brands such as Walker, Ferrari or Exhaust, can offer excellent value for money. These manufacturers often use the same technologies and materials as the factory, but sell the products at a lower price. However, when choosing an analogue, you need to carefully check the thickness of the metal and the quality of the coating. Cheap Chinese copies are often made of thin steel, which rusts after just six months of use.
In some cases, owners prefer to use pipes from other models or universal solutions adapted to Nissan. This requires the participation of an experienced exhaust system technician who can properly fit the parts.
Original spare parts ensure durability and no leakage problems, but high-quality analogues from trusted brands can be an excellent alternative on a limited budget.
Nuances of operation and prevention
After installing a new or repaired downpipe, it is important to follow the operating instructions to extend the life of the part. Avoid sudden changes in temperature, such as washing the engine with cold water immediately after a long drive. Thermal shock can cause metal to crack or welds to fail. Also, try not to warm up the engine for too long at idle unless necessary.
Regular exhaust system inspection should be part of your maintenance schedule. Pay attention to the condition of the muffler supports, as their wear leads to distortion of the entire system and accelerated destruction of the exhaust pipe. If you often drive off-road or on poorly paved roads, check the integrity of the pipe after each such trip for dents or scratches.
Use high-quality fuel that does not contain aggressive additives that can accelerate corrosion from inside the pipe. Low-quality fuel can lead to the formation of soot, which disrupts heat transfer and overheats the catalyst. Monitor the readings of the oxygen sensors, as their incorrect operation may indicate problems in the exhaust system even before visible signs of failure appear.
- 🚗 Driving: avoid sharp impacts on curbs to avoid bending the pipe.
- 💧 Washing: do not pour cold water on the hot exhaust after a trip.
- ⛽ Fuel: Use gasoline of at least the recommended octane rating.
⚠️ Attention! Ignoring problems with the exhaust pipe can lead to failure of the expensive catalyst and oxygen sensors, the repair of which will cost several times more than replacing the pipe itself.
FAQ: Frequently asked questions
What is the average cost of replacing a downpipe on a Nissan Murano Z51?
The cost of work on average ranges from 3,000 to 6,000 rubles, depending on the region and complexity of access. The price of the spare part itself varies from 10,000 rubles for an analogue to 40,000 rubles and more for an original.
Is it possible to drive with a leaky exhaust pipe before repair?
It's possible for a short time, but it's dangerous. Carbon monoxide may enter the cabin, and oxygen sensors may produce incorrect data, leading to excessive fuel consumption and loss of power. In addition, the noise from the exhaust will be very loud.
Is it necessary to do a wheel alignment after replacing the exhaust pipe?
No, replacing exhaust system components does not affect wheel alignment, so a wheel alignment procedure is not required if the suspension components were not affected.
Why did a knock appear after replacing the pipe?
The knocking noise may occur due to improper installation of the gasket, lack of lubrication on the bolts, misalignment of the pipe, or poor tightening. It is also possible that the muffler mounts are worn and require replacement.
How often do you need to change the exhaust pipe gasket?
It is recommended to change the gasket every time the pipe is replaced or when dismantled to access other components. It is a consumable item and cannot be reused.