Car Nissan Murano second generation, known in the body Z51, gained popularity thanks to its comfortable suspension and powerful V6 engine. However, crossover owners often face questions regarding the all-wheel drive system, namely the transfer case. This unit is the heart of the transmission, distributing torque between the axles, and its performance is critical for dynamics and safety.
Many drivers mistakenly believe that all-wheel drive is Nissan Murano works like on SUVs with a frame structure. In fact, in the back Z51 a complex electronically controlled system is used, where the transfer case constantly monitors wheel slippage. Understanding how this system works helps you avoid costly repairs and extend the life of your vehicle.
Design and principle of operation of the transfer case
The design of the transfer gear is based on a planetary gear set, which allows you to change the torque ratio between the front and rear axles. The main feature of the system is the absence of a rigid locking of the center differential in the usual sense. Instead, a multi-plate clutch is used, controlled by an electronic control unit (ECU).
Electronics constantly analyzes data from wheel speed sensors. If the rear wheels begin to slip, the system instantly redistributes torque to the front axle. This happens in a split second, allowing the car Nissan Murano Z51 maintains stability on slippery roads without driver intervention.
The assembly design includes an input shaft connected to the transmission, and two output shafts leading to the front and rear differentials. Lubrication is provided by a separate oil pump, which creates pressure in the clutch hydraulic system. Clutch pressure directly affects the rigidity of the lock and the ability to transmit force.
⚠️ Attention: Operating a vehicle with a faulty speed sensor may result in the transfer case not being able to operate on time, which can result in a complete loss of traction on one of the axles in a critical situation.
- Planetary gearbox provides a smooth change in gear ratio.
- Multi-plate clutch is responsible for connecting the front axle.
- Hydraulic pump creates the necessary pressure to compress the discs.
Typical faults and their causes
The most common transfer case problem on Nissan Murano Z51 is a failure of the hydraulic pump. Over time, the pump gears wear out, which leads to a drop in pressure in the system. Without pressure, the multi-plate clutch cannot close, and the car loses all-wheel drive, turning into front-wheel drive.
Another vulnerable point is the wheel speed sensors and the transfer case ECU itself. Oxidation of contacts or failure of one of the sensors causes the system to mistakenly assume that the wheels are slipping. This can lead to constant engagement of the clutch, overheating and jamming of the mechanism.
Owners often encounter the problem of “jerking” when driving. This phenomenon, known as "judder", occurs due to uneven compression of the clutch discs or wear of the planetary gear. If you feel vibration or jolting during acceleration, it is necessary to immediately carry out diagnostics, as ignoring the symptom will lead to destruction of the bearings.
⚠️ Attention: Replacing only the pump without flushing the hydraulic system from metal shavings often leads to repeated failure of the new unit within several thousand kilometers.
The critical factor is the quality of the oil used. Many drivers save on technical fluids by filling in analogues that do not meet the specifications Nissan Matic S. Incorrect viscosity disrupts the operation of hydraulics and leads to rapid wear of the friction discs.
- Pump wear - the most common cause of loss of all-wheel drive.
- Clogged filter restricts oil flow and causes overheating.
- Faulty sensors provoke false alarms of the system.
- Clutch overheating Occurs during prolonged towing or driving in mud.
- Every 30,000 km
- Every 60,000 km
- Only in case of breakdown
- I don't know what it is
Diagnostics of transfer gear condition
The first step in diagnosis is a computer scan. Using a specialized scanner, you need to check for errors in the transmission control unit. Errors starting with code P, often indicate problems with pressure in the hydraulic system or faulty sensors.
Visual inspection also plays an important role. It is necessary to check the oil level in the transfer case and its condition. If the oil has a dark color, a burning smell, or metal particles are visible in it, this is a sure sign of serious damage to the internal components. Metal shavings in the pan - an alarm signal that requires complete disassembly of the unit.
A test drive with connected diagnostic equipment allows you to track the behavior of the coupling in real time. The specialist can see how the clutch pressure and response time changes when simulating slippage. This helps determine exactly where the problem lies: mechanical or electronic.
- Computer diagnostics reveals hidden errors and operating parameters.
- Oil analysis shows the degree of wear of internal components.
- Pressure check confirms the functionality of the hydraulic pump.
Unit repair and restoration options
Transfer case repairs can range from a simple pump replacement to a major overhaul with planetary gear replacement. If the problem is limited to hydraulic pump wear and oil contamination, it is enough to replace the pump, flush the system and install a new filter. This is the most cost-effective restoration option.
In cases where friction discs are destroyed or gears are worn, complete disassembly of the unit is required. The technician needs to replace all worn parts with original or high-quality analogues. It's important to note that high-quality assembly requires precise adherence to bolt tightening torques and correct installation of seals.
There is also the option of replacing the transfer case with a rebuilt (reconstructed) one. This approach can be beneficial if the cost of spare parts and major repairs exceeds the price of the rebuilt unit. However, when choosing a remanufactured transfer case, it is important to verify the warranty on the work and the parts used.
☑️ Action plan when a malfunction is detected
You should not try to repair the transfer case yourself without special equipment. Incorrect assembly may result in the mechanism jamming during movement, which can be life-threatening. Professional repairs in a specialized service guarantee the reliability and durability of the restored unit.
- Pump replacement — quick and cheap repairs in the absence of deep damage.
- Major renovation includes replacement of all worn parts and bearings.
- Refurbished unit - an alternative for high wear of internal components.
Operating rules and oil selection
For correct operation of the transfer case on Nissan Murano Z51 You must use only fluids recommended by the manufacturer. The standard requirement is oil Nissan Matic S or its full analogue with appropriate tolerances. The use of transmission oils for manual transmissions or other types of automatic transmissions is unacceptable.
Regular oil changes are key to long service life. Despite the fact that the manufacturer may indicate the oil “for a lifetime”, real practice shows that it needs to be changed every 60,000 km. More frequent replacement is recommended when used in severe conditions: off-road, towing trailers or frequent trips in the snow.
It is important to avoid prolonged slipping. All-wheel drive system Nissan Murano designed for short-term connection of the front axle, and not for permanent operation in “dirt” mode. Prolonged slipping leads to overheating of the coupling and failure of the hydraulics. If the car is stuck, it is better to use a shovel or tow than to accelerate.
⚠️ Attention: Using low viscosity or counterfeit oil may result in the clutch not being able to create the necessary pressure, and you will be left without all-wheel drive at the most inopportune moment.
You should also monitor the condition of the driveshaft and front/rear differential. Distortions or play in these units create additional load on the transfer case, accelerating its wear. Regular inspection of your suspension and transmission will help identify problems early.
Timely replacement of high-quality oil and avoidance of prolonged slippage is the key to long service life of the Nissan Murano Z51 transfer case without expensive repairs.
Comparison of original spare parts and analogues
When choosing spare parts for transfer case repair, owners are often faced with a choice: original parts Nissan or high-quality analogues. Original pumps and friction discs provide maximum reliability and meet all factory tolerances, but their cost is significantly higher.
Analogues from well-known brands such as Exedy or Aisin, often offer reasonable value for money. However, when purchasing analogues, you must be extremely careful, since there are many fakes on the market that can fail within a short time. Always check the packaging and quality certificates.
| Part type | Original (Nissan) | Analogue (Exedy/Aisin) | Recommendation |
|---|---|---|---|
| Hydraulic pump | High price, ideal geometry | Average price, good quality | Better original for critical nodes |
| Friction discs | Durability, stability | Affordable price, variability | High-quality analogues are acceptable |
| O-rings | Perfect tightness | Often require replacement with the original | Strictly original |
| Filter | High throughput | Different quality | Original is preferable |
Saving on seals and filters is a false economy. These small parts play a huge role in maintaining oil pressure and cleanliness. Replacing them with low-quality analogues can lead to leaks and rapid contamination of the system, nullifying all repairs.
What to do if the original spare part is not available?
If the original pump is not available, you can consider using a high-quality analogue, but with mandatory flushing of the entire hydraulic system. A temporary solution is to install a refurbished original unit if its warranty is higher than that of a new analogue.
FAQ: Frequently asked questions
What is the real service life of the transfer case on the Nissan Murano Z51?
With timely oil changes and proper operation, the service life of the transfer case can reach 200,000 km or more. However, if you ignore maintenance or frequently travel off-road, the resource can be reduced to 100,000 km.
Is it possible to drive a Nissan Murano Z51 with a faulty transfer case?
Technically, the car will remain on the road, but will lose all-wheel drive and become front-wheel drive. However, driving with a malfunction can lead to destruction of other transmission components due to distortions and vibrations, so continued operation is not recommended.
How often do you need to change the oil in the transfer case?
It is recommended to change the oil every 60,000 km. If the car is operated in difficult conditions (mud, snow, towing), the interval should be reduced to 40,000 km.
What symptoms indicate a faulty transfer pump?
The main symptoms are the “4WD” light on the dashboard, lack of traction on the front wheels, as well as extraneous noise and vibration when driving. Computer diagnostics will show an error in pressure in the hydraulic system.
Is it possible to replace the transfer case yourself?
Replacing the transfer case requires special equipment for removing and installing the unit, as well as fine tuning. This is a complex procedure that is best left to professionals in a specialized service to avoid damage to other components.