Nissan Murano Cvt Transmission For Sale

The Nissan Murano, known for its distinctive styling and comfortable ride, has frequently featured a Continuously Variable Transmission (CVT). While traditionally known for fuel efficiency, the Murano's CVT has also garnered attention due to performance quirks and, unfortunately, reliability concerns. This article delves into the technical aspects of the Murano's CVT, exploring its operation, common issues, and considerations for those encountering a "Nissan Murano CVT transmission for sale" listing.

Understanding the CVT Principle

Unlike conventional automatic transmissions that rely on fixed gear ratios, a CVT uses a system of pulleys and a belt (or chain) to create an infinite number of gear ratios within its operating range. In the Murano's application, this translates to smoother acceleration and potentially better fuel economy, as the engine can constantly operate at its most efficient RPM for the given driving conditions.

The core components of the Murano's CVT are:

• Input Pulley (Primary Pulley): Connected to the engine, this pulley receives power and transfers it to the belt.
• Output Pulley (Secondary Pulley): Connected to the differential, this pulley receives power from the belt and transmits it to the wheels.
• Steel Belt (or Chain): A high-strength, flexible belt (often constructed of steel segments) that connects the two pulleys, transferring power between them.
• Hydraulic Control System: A complex system of valves, sensors, and a transmission control unit (TCU) that precisely regulates the pressure applied to the pulleys, controlling their effective diameter.
• Transmission Control Unit (TCU): The "brain" of the CVT, receiving data from various sensors (engine speed, throttle position, vehicle speed, etc.) and using this information to calculate the optimal pulley ratio.

The 'magic' happens through the variable diameter of the pulleys. Each pulley is made of two opposing conical faces. By moving these faces closer together or further apart, the effective diameter of the pulley changes. When the input pulley's diameter is small and the output pulley's diameter is large, the CVT is in a low gear ratio, providing high torque for acceleration. Conversely, when the input pulley's diameter is large and the output pulley's diameter is small, the CVT is in a high gear ratio, suitable for cruising and fuel efficiency.

How the Hydraulic System Works

The hydraulic system is crucial for controlling the pulley diameters. High-pressure fluid, generated by a pump, is directed to hydraulic cylinders within each pulley. By precisely controlling the fluid pressure in these cylinders, the TCU can force the pulley faces closer together or further apart, effectively changing the gear ratio. Solenoid valves, controlled by the TCU, act as precision switches, directing fluid flow to the appropriate cylinders.

Furthermore, the hydraulic system also provides lubrication and cooling to the CVT's internal components. Maintaining the correct fluid level and condition is absolutely critical for the long-term health of the transmission.

Common Issues with the Murano's CVT

Despite its theoretical advantages, the Murano's CVT has been prone to several issues, impacting its reliability and longevity. These issues often stem from the stresses placed on the belt and the sensitivity of the hydraulic control system.

• Belt Slippage: One of the most common problems is belt slippage. This occurs when the belt loses its grip on the pulley faces, resulting in a loss of power and often accompanied by a noticeable shudder or hesitation. Over time, wear and tear on the belt and pulleys can exacerbate this issue. Aggressive driving and towing can accelerate belt wear.
• TCU Malfunctions: The TCU is a complex electronic component, and failures can lead to erratic shifting, limp mode (reduced power), or complete transmission failure. Software glitches, sensor malfunctions, or internal component failures within the TCU can all contribute to these problems.
• Hydraulic System Problems: Issues with the hydraulic pump, solenoid valves, or internal leaks can disrupt the precise control of the pulley diameters. This can manifest as delayed engagement, rough shifting, or a complete loss of drive. Clogged filters due to infrequent fluid changes can lead to pump starvation and component damage.
• Fluid Degradation: CVT fluid is specifically formulated for the unique demands of this type of transmission. Using the wrong fluid or neglecting regular fluid changes can lead to premature wear and failure. Overheating the fluid can also cause it to break down, losing its lubricating and cooling properties.
• Juddering/Shuddering: This often felt during light acceleration or at low speeds, is a common complaint and can be caused by a variety of factors, including belt slippage, worn pulleys, or contaminated fluid.

The heat generated within the CVT is a major contributing factor to many of these issues. Unlike a conventional automatic, the CVT constantly adjusts its ratios, generating significant friction and heat. Adequate cooling is essential, but the Murano's CVT cooling system has sometimes been criticized for being inadequate, particularly in demanding driving conditions.

Considerations When Purchasing a Used Murano CVT

If you're considering purchasing a Nissan Murano with a CVT, particularly one with a "Nissan Murano CVT transmission for sale" advertisement, careful due diligence is essential.

• Vehicle History Report: Obtain a comprehensive vehicle history report (e.g., Carfax or AutoCheck) to check for any reported transmission issues, accidents, or maintenance records. Pay close attention to any instances of transmission repairs or replacements.
• Thorough Inspection: Have a qualified mechanic inspect the transmission. They can check the fluid level and condition, look for leaks, and assess the overall health of the transmission.
• Test Drive: Conduct a thorough test drive, paying close attention to the transmission's behavior. Look for signs of slipping, hesitation, rough shifting, or unusual noises. Try accelerating from a stop, cruising at various speeds, and engaging the transmission in different drive modes (if equipped).
• Fluid Condition: Examine the CVT fluid. It should be a light amber color and free of debris. Dark, burnt-smelling fluid is a sign of overheating and potential transmission damage.
• Previous Owner Information: If possible, speak to the previous owner to inquire about any transmission-related issues they may have experienced.
• Warranty: Check if the vehicle is still under warranty, or if an extended warranty is available that covers the CVT.
• Replacement Cost: Be aware of the potential cost of replacing or repairing the CVT. Replacement costs can be substantial, and this should be factored into your purchase decision. Consider the labor cost and parts availability.
• Software Updates: Check if any software updates have been issued for the TCU. These updates can sometimes address known issues and improve transmission performance.

It's crucial to remember that a lower price on a Murano with a "Nissan Murano CVT transmission for sale" sign may reflect underlying transmission problems. A pre-purchase inspection is a relatively small investment compared to the cost of replacing a failed CVT.

Maintenance and Prevention

Proper maintenance is paramount for extending the life of the Murano's CVT. The most critical aspect is regular fluid changes, using only the specified Nissan CVT fluid. Follow the manufacturer's recommended service intervals, or even shorten them if the vehicle is subjected to harsh driving conditions.

Other preventative measures include:

• Avoiding aggressive driving habits, such as hard acceleration and frequent towing.
• Ensuring the cooling system is functioning properly, including checking the radiator and coolant level.
• Addressing any transmission issues promptly, rather than delaying repairs.

By understanding the intricacies of the Murano's CVT and taking proactive steps to maintain its health, you can potentially mitigate the risk of premature failure and enjoy a smoother, more reliable driving experience.