Steering rack on a crossover Nissan Murano the second generation (Z51 body) is a critical component ensuring safe driving. Over time, especially when used on Russian roads, characteristic symptoms of wear appear: knocking in the area of the steering wheel, play, fluid leakage, or increased effort when turning the steering wheel. Ignoring these signs can lead to a complete failure of the control system while driving, which can lead to serious accidents.
The process of replacing this unit requires not only special tools, but also a deep understanding of the design of the power steering mechanism. Many owners try to eliminate the knocking noise with an adjusting bolt, but if the wear of the gear pair or oil seals is critical, this is only a temporary measure. A complete replacement of the unit is the most reliable solution that allows you to return the car to factory control sharpness and silence in the cabin.
Symptoms of malfunction and diagnosis of the steering mechanism
The first signal of problems is often a metallic knock, which is heard when driving over bumps or when turning corners. This sound can come from both the rack itself and the steering rods, so it is important to conduct a thorough diagnosis. On Nissan Murano Z51 The problem of leaking gear shaft seals is also common, which leads to a drop in the fluid level in the power steering reservoir.
If you feel a “wobbly” steering wheel or the need to constantly adjust it on a straight road, this indicates the presence of play in the engagement. In some cases, the steering wheel may jam in extreme positions. It is important to distinguish rack problems from a malfunction of the power steering pump or the steering shaft itself with cardan shafts, since the symptoms may be similar.
- 🔊 Strong knocking sound in the area of the steering column when passing speed bumps
- 🛢️ Drop in the level of working fluid in the power steering reservoir without visible external leaks
- 🔄 Increased steering effort, especially when parking at low speeds
- ⚙️ The appearance of a hum or vibration through the steering wheel when the engine is running
⚠️ Attention: If the knocking sound is accompanied by a crunching sound, the teeth of the rack or shaft itself may be damaged. In this case, operating the vehicle is strictly prohibited until repairs are made.
For an accurate diagnosis, you need to put the car on a lift and rock the front wheels. If the play is felt directly on the rack body, and not at the ends of the rods, the problem is inside the mechanism. Also check the condition of the anthers: if there is oil inside them, then the seals have failed.
Choosing a spare part: original or analogue?
When choosing a new steering rack, owners Nissan Murano are faced with a dilemma: buy an original unit or consider a high-quality analogue. Original from Nissan guarantees perfect compliance with all parameters and durability, but its cost is often overpriced. In addition, there are many fakes on the market that pass off as original.
Analogs from trusted brands such as ZF or TRW, can be a great alternative. These manufacturers are often suppliers to the assembly line, so their products are of high build quality. However, it is important to ensure compatibility by VIN code, since on different trim levels Murano Z51 racks with different transmission ratio characteristics can be installed.
There is also the option of purchasing a remanufactured (remanufactured) rack. This is a unit that has been disassembled, all worn oil seals and bushings have been replaced, and the shaft has been polished. This is a compromise option that is cheaper than a new one, but requires checking the quality of restoration from the seller.
- 🔧 Original Nissan: maximum reliability, high price, risk of counterfeiting
- 🏭 Analogs ZF / TRW: excellent quality, often cheaper than the original, easy to find
- 🔩 Restored rack: saving money, but depends on the honesty of the master
- Original new rack
- High-quality analogue
- Refurbished rack
- Repairing an old rail
Old rod joints are already worn out, and installing a new rack on worn rods will negate the effect of replacement.
Preparing tools and work area
Replacing the steering rack with Nissan Murano Z51 - a labor-intensive operation that requires access to the bottom of the car and the engine compartment. You will definitely need a car lift or reliable stands (goats), since working under the car with a jack will be extremely inconvenient and dangerous. The set of tools should include standard sockets, wrenches, as well as specific pullers for tie rod ends.
Don't forget to prepare a container to drain the fluid from the power steering system. You will also need a syringe or bulb to pump out remaining oil from the tank. To unscrew the rack mounting bolts, which often stick, penetrating lubricant and a powerful wrench with an extension are useful. In some cases, a gas wrench may be required to turn the steering shaft.
☑️ Preparing to replace the steering rack
Pay special attention to safety. Before starting work, be sure to remove the terminal from the battery to prevent a short circuit when disconnecting the steering angle sensors. If your model has a Steering Angle Sensor (SAS), removing it requires special care to avoid throwing off the calibration.
- 🔑 Set of sockets and keys (including Torx and hexagons)
- 🛢️ Container for waste liquid and rags
- 🛠️ Steering wheel end remover and circlip remover
- 💧 Penetrating lubricant (such as WD-40 or equivalent) for rusty bolts
Step-by-step instructions for dismantling and installation
The process begins with removing the front wheels and engine crankcase protection. Unscrew the nuts securing the steering ends to the steering knuckles, using a puller to avoid damaging the threads. After this, disconnect the rods from the rack itself. If the rack is attached through the intermediate shaft, it must also be dismantled, having previously noted the position of the flanges to maintain alignment.
Next, you need to unscrew the bolts securing the rack itself to the subframe. There are usually four of them, and they can be very lengthy. After loosening the fasteners, carefully disconnect the power steering pipes, immediately plugging them to avoid dirt getting into the system. The rack is quite heavy, so it is better to work with two people or use a stand.
Installing a new rail is done in the reverse order. It is important not to overtighten the mounting bolts, as this can deform the housing and cause knocking. The power steering pipes must be connected tightly, without distortions. After installation, fill in new fluid to the maximum and carry out the procedure for bleeding the system, rocking the steering wheel from end to end with the engine running.
How to properly bleed the power steering system?
After replacing the rack, you need to start the engine and turn the steering wheel from lock to lock several times. Monitor the fluid level and add if necessary. If a hum is heard, repeat the procedure. Do not hold the steering wheel in the extreme position for more than 5 seconds to avoid overheating the pump.
Pay attention to the tightening of the bolts. Use a torque wrench to maintain the manufacturer's recommended tightening torques. For rack-to-subframe bolts, this is usually about 100-120 Nm, and for tips - 40-50 Nm. The exact values can be found in the service documentation for your specific model year.
⚠️ Attention: When unscrewing the bolts securing the rack to the subframe on Murano Z51 It is often necessary to remove the entire subframe or lower it to gain access to the rear of the mount. This makes the job much more difficult.
Before starting work, take photographs of the location of all tubes and connectors so that during assembly you do not get confused in their connections.
Wheel alignment and sensor calibration
After replacing the steering rack, a procedure for adjusting the wheel alignment angles (wheel alignment) is required. Any intervention in the steering linkage changes the suspension geometry, and without adjustment, the car will pull to the side, and the tires will begin to wear unevenly. On Nissan Murano the procedure requires a specialized stand and a qualified technician.
If your vehicle is equipped with Vehicle Stability Control (VDC) and a Steering Angle Sensor (SAS), computer calibration of the sensor may be required after replacing the unit. Without this procedure, the system may display an error on the dashboard and disable electronic assistants. The procedure is performed through a diagnostic scanner.
| Parameter | Meaning | Note |
|---|---|---|
| Front wheel alignment | 0° ± 10' | Critical for sustainability |
| Front wheel camber | -1° 30' ± 30' | Depends on load |
| Caster | 3° 30' ± 30' | Usually not regulated |
| SAS Calibration | Required | Via diagnostic scanner |
Do not try to set the angles yourself using the marks on the rods. Even a minimal error in millimeters can lead to rapid tire wear and poor handling. Entrust this work to professionals at a specialized service.
Wheel alignment and sensor calibration after replacing the rack is not an option, but a mandatory requirement for tire safety and durability.
Common replacement mistakes and how to avoid them
One of the most common mistakes is trying to save on power steering fluid. Use only the fluid recommended by the manufacturer, usually this Nissan PSF or a specific type of ATF. Mixing different types of liquids can lead to destruction of rubber seals and repeated failure of the system.
Another mistake is ignoring the condition of the intermediate shaft. If there is play in the universal joint, a new knock will appear very quickly, even with a new rack. Also, do not skimp on new fastening bolts: many of them are disposable and have a tensile yield strength.
- 🚫 Using the wrong power steering fluid
- 🚫 Ignoring play in the intermediate shaft
- 🚫 Reusing old mounting bolts
- 🚫 Neglecting the sensor calibration procedure
What to do if the rack knocks after replacement?
Check the tightness of the bolts securing the rack to the subframe. Make sure that all rubber pads under the rail are not deformed. Check that the tie rods are not twisted during assembly. If the knocking noise remains, there may be a defect in the new part.
If after replacement you feel vibration in the steering wheel, check the wheel balancing. Sometimes, when dismantling the rack, the geometry of the suspension is disrupted, which affects the operation of the wheels. Also check that the boots are installed correctly: if they are twisted, they will create resistance and will quickly tear.
FAQ: Answers to frequently asked questions from owners
How long does it take to replace the steering rack on a Murano Z51?
On average, the process takes from 4 to 6 hours if you have experience and a lift. If subframe removal or complex calibration is required, the time may increase.
Is it possible to do without removing the subframe?
In some cases, if you have long extensions and special tools, you can unscrew the rear rack bolts without completely removing the subframe, but this requires considerable effort and risks stripping the threads.
Do I need to change the power steering pump when replacing the rack?
No, if the pump works properly and does not make noise. However, if dirt or metal shavings got into the old rail, it is better to flush or replace the pump so that the particles do not damage the new part.
Which fluid is best for the power steering system?
It is best to use the original liquid Nissan Power Steering Fluid or specifications specified in the service book (often this is Dexron III or specific fluids for electric power steering).
How do you know if the steering rack in your Murano Z51 needs replacing?
The key symptom is a knocking noise that intensifies when turning the steering wheel in place or at low speeds, as well as obvious play that cannot be eliminated by adjustment.