The exhaust system is one of the key components that ensure comfortable and environmentally friendly operation of the vehicle. Nissan Murano second generation (Z51 body). Over time, under the influence of vibrations, temperature changes and corrosion, the thin-walled elements of the exhaust system begin to collapse. The most vulnerable point in the design of the muffler of this model is the corrugation, which acts as a damper that dampens mechanical vibrations.
The appearance of extraneous noise, a characteristic “tractor” sound or smoke under the hood often indicates a rupture of the corrugation. Ignoring this problem can lead to catalytic converter failure, increased exhaust toxicity, and even fire if hot gases contact suspension or body parts. Timely diagnosis and replacing corrugations allow you to restore normal operation of the exhaust system without the need to replace the entire muffler assembly.
Why does the corrugation fail on a Nissan Murano Z51?
The main function of the corrugation is to compensate for engine and transmission vibrations. On Nissan Murano Z51 The V6 engine runs quite smoothly, but during sudden starts, braking and driving over bumps, there is a significant load on the exhaust system. Corrugated metal, consisting of many intertwined wires, loses elasticity and gets tired over time.
Factors that accelerate wear include:
- ❄️ Operation in aggressive winter environments using reagents that corrode metal.
- 🔥 Overheating of the exhaust system during long traffic jams or aggressive driving.
- 🌊 Water entering a hot muffler when crossing deep puddles, causing thermal shock.
- ⚙️ Natural metal fatigue that occurs after a run of more than 100,000 km.
Owners often notice a problem when a strong exhaust smell appears in the cabin or a loud whistle is heard. At this moment, the corrugation may already be completely torn, and the gases escape for other purposes, but under the bottom of the car. It is important to understand that repair by applying patches is ineffective here, since the material quickly burns out.
Choice of spare parts: original or analogue
If replacement is necessary, owners Nissan Murano Often faced with a dilemma: buy an original part from the manufacturer or choose a high-quality analogue. Original corrugation (OEM) has ideal geometry and durability, but its cost can be quite high and delivery times can be long.
Analogs from trusted brands such as Walker, Firestone or specialist exhaust system manufacturers, often offer excellent value for money. The main thing when choosing is to pay attention to the wall thickness and weaving material. Cheap Chinese fakes may not withstand even a month of use.
- 🛡️ The original part ensures maximum tightness and resource, but is expensive.
- 🏷️ High-quality analogues (Walker, Bosal) last a long time and cost 2-3 times cheaper than the original.
- 🔧 Universal corrugations require precise fitting and welding, which increases labor costs.
If you are planning to install a universal corrugation, make sure that it is designed for the diameter of your pipe. For Nissan Murano Z51 the standard diameter is often 50-55 mm, but before purchasing you need to measure the pipe with a caliper. An error in diameter will lead to gas leaks and rapid loss of tightness.
Preparation for replacement and necessary tools
The process of replacing corrugations with Nissan Murano does not require dismantling the entire muffler if you have access to the repair site. However, working under a vehicle always involves risks, so careful preparation is the key to success. You will need a pit or lift, as well as reliable supports for belaying.
Be sure to prepare the following tools:
- 🔧 Welding machine (acetylene or inverter) for high-quality connection.
- 🔨 Hammer, chisel and penetrating lubricant for unscrewing stuck bolts.
- 📏 Tape measure, caliper and marker for marking the cut.
- 🧤 Protective gloves and glasses for safety when welding and working with metal.
Be sure to purchase a special muffler lubricant or graphite lubricant to treat the joints before assembly. This will prevent the bolts from sticking in the future. If you plan to do the job yourself, make sure you have access to professional welding equipment, as a regular spot weld may not withstand vibrations.
⚠️ Attention: Never carry out welding work on a hot engine or exhaust system. Allow the vehicle to cool completely to avoid burns and fuel vapor ignition.
- Complete Welding Set
- There is only a grinder and a hammer
- I'll give it to the service
- No tools
Step-by-step instructions for replacing the corrugation
The replacement process itself begins with lifting the car and thoroughly inspecting the damage site. If the corrugation is completely torn, it must be cut out with a grinder, leaving small indentations from the catalyst and the exhaust pipe so as not to damage these expensive elements.
Next comes surface preparation. The cut areas must be cleaned to a metallic shine, removing rust and carbon deposits. This is critical to the quality of the weld. Install the new bellows and make sure there is no tension or slack in the neutral position.
☑️ Preparation for welding
Welding should be done in several passes, avoiding overheating of the metal. The seam should be continuous and uniform. After the seam has cooled, be sure to treat it with an anti-corrosion compound specifically designed for exhaust systems. This will extend the life of the repair in winter road conditions.
If you do not have welding skills, it is better to entrust this operation to professionals. An incorrectly installed corrugation may begin to “growl” at certain speeds or quickly burn out. The service will also check the integrity of all other elements of the system.
What to do if you don’t have a welding machine?
You can use special repair clamps with silicone inserts, but this is a temporary solution. For long-lasting repairs, argon or arc welding is required.
⚠️ Attention: When welding corrugation, make sure that current does not pass through the oxygen sensors (lambda probe), as this can damage them. Disconnect sensors before starting work.
Common mistakes when repairing the exhaust system
Many car owners and even some craftsmen make typical mistakes that lead to repeated failure of the corrugation in the shortest possible time. One of the most common problems is incorrect selection of the length of a new part. If the corrugation is installed in tension, it will quickly tear due to constant mechanical loads.
Another mistake is using the wrong material for welding. Ordinary steel burns quickly at high temperatures, so it is necessary to use heat-resistant electrodes or argon welding. Also, the condition of the muffler suspension cannot be ignored.
- 🚫 Installation of corrugation without taking into account temperature expansion.
- 🚫 Ignoring the wear of rubber muffler hangers.
- 🚫 Lack of anti-corrosion treatment of seams after repair.
- 🚫 An attempt to save on materials by using cheap clamps.
It is also important to check the condition of the catalyst. If the corrugation has been torn for a long time, it is possible that metal particles or debris have gotten inside, which can clog the catalyst honeycomb. In this case, replacing only the corrugation will not solve the problem with loss of engine power.
Before starting welding, remove the battery terminal to avoid accidental shorting and damage to the vehicle electronics.
Comparison table of repair methods
For clarity, let’s compare the main methods for eliminating corrugation failure on Nissan Murano Z51. This will help you choose the most suitable option depending on your budget and quality requirements.
| Repair method | Cost | Resource | Complexity |
|---|---|---|---|
| Replacement with original corrugation | High | 100+ thousand km | Average |
| Installation of high-quality analog corrugation | Average | 50-80 thousand km | Average |
| Temporary repair with clamps | Low | 1-3 months | Low |
| Installation of universal corrugation | Average | 30-50 thousand km | High |
As can be seen from the table, the most reliable option is replacement with a high-quality part. Saving on temporary solutions often leads to more serious damage. Installation of a universal corrugation requires a highly qualified welder and precise adjustment, otherwise the service life will be minimal.
High-quality welding and correct selection of corrugation length are more important than the cost of the part itself. A bad seam will destroy even the most expensive element.
Symptoms and diagnosis of problems
Early diagnosis allows you to avoid expensive catalyst repairs. The first sign is a change in the exhaust sound. If you hear a metallic ringing or whistling sound, especially at idle, this is a sure sign of a corrugation rupture.
The second symptom is the smell of exhaust gases in the cabin or near the car when parked. This is a health hazard and may indicate a leak before the catalytic converter. Also pay attention to smoke under the car as the engine warms up.
For accurate diagnosis, you can use a soap solution applied to the joints while the engine is running. The appearance of bubbles will indicate the location of the leak. If visual inspection is inconclusive, technicians use endoscopic equipment to inspect the inside of the system.
⚠️ Attention: If you smell gas in the cabin, stop immediately and turn off the engine. Leaking exhaust gases can lead to carbon monoxide poisoning.
FAQ: Frequently asked questions
How difficult is it to replace the corrugation yourself?
Self-replacement is possible if you have a pit, a welding machine and skills in working with metal. The main difficulty is access to the welding site and the need for high-quality welding of the seam on both sides.
How much does it cost to replace a corrugation service?
The cost of work varies from 2000 to 5000 rubles depending on the region and complexity of access. This price usually does not include the cost of the spare part itself and welding materials.
Is it possible to drive with a torn corrugation?
Short term - yes, but it's not safe. Leakage of gases can lead to poisoning, and contact with suspension elements can lead to a fire. In addition, the engine may become unstable due to changes in system pressure.
How long will the repair last?
With professional welding and the use of high-quality corrugation, repairs can last from 3 to 5 years. Temporary solutions on clamps last for several months.
Do I need to change the muffler hangers?
It is recommended to check the condition of the rubber hangers. If they are stretched or torn, their replacement is mandatory, as this will remove excess load from the new corrugation and extend its service life.