Nissan Murano Z51 steering rack: how to recognize a fault and restore controllability

Steering rack Nissan Murano Z51 (2007–2014) - a unit on which the control accuracy and safety of the crossover directly depend. Despite the reputation of a reliable component, over time even the original slats begin to “knock”, play or leak. Owners often ignore the first symptoms, attributing them to “suspension features,” but such a delay is fraught with expensive repairs or an accident.

In this article we will analyze Murano Z51 steering rack design, typical malfunctions (from wear of oil seals to destruction of a gear pair), and we will also give step-by-step instructions for diagnosis and repair. We will pay special attention unique problem of the Z51 rack - premature wear of the worm shaft bushing due to a design defect, which manifests itself even with careful use. The material is based on the experience of service technicians and reports from owners with mileage of over 100 thousand km.

Murano Z51 steering rack design: weak points and features

Steering rack Murano Z51 belongs to the type rack and pinion with hydraulic booster (power steering) and has the catalog number of the original 48500-JM00A (for models with engines VQ35DE And VQ25DE). Unlike later versions (eg Z52), an aluminum body with reinforced fastenings to the subframe is used here, but this does not save from characteristic problems:

• 🔧 Worm shaft bushing — wears out by 120–150 thousand km due to insufficient lubrication and ingress of abrasive particles. Leads to play and knocking when turning.
• 💧 Oil seals and cuffs — leak due to aging rubber (especially when using non-original power steering fluid). Critical for a rack with a mileage of 180+ thousand km.
• ⚙️ Gear pair - rare, but teeth chipping occurs under extreme loads (for example, after hitting a wheel).
• 🔄 Power steering pump — indirectly affects the service life of the rack: when the pump wears out, metal shavings appear in the system, accelerating the wear of the bushing.

Interesting fact: in the rack Murano Z51 used reinforced steering column shaft (compared to X-Trail T31), but this does not compensate for the weakness of the bushing. The manufacturer recommends replacing it every 100 thousand km, but in practice the interval is reduced to 80 thousand km when driving on bad roads.

Signs of malfunction: when the rack needs to be checked urgently

The first symptoms of a problem with the steering rack Murano Z51 often disguised as wear on the suspension or ball joints. However there is unique “bells”, which directly point to the rail:

⚠️ Attention: If when you turn the steering wheel in place you hear crunch (not a knock!), this is a sign of destruction of the gear pair. Operating the car in this condition is dangerous - the rack may jam!

• 🔊 Knock when driving over bumps - most often associated with play in the worm shaft bushing. This can be checked by rocking the steering wheel left and right with the engine off.
• 💦 Power steering fluid leaks on the rack boots or under the car (color - red or brown). Leakage from seals accelerates wear on internal parts.
• 🌀 Increased steering play (more than 10° when checked at a service station). Norm for Murano Z51 - up to 5°.
• 🔄 "Heavy" steering wheel in one of the extreme positions (for example, when parking). Indicates that the shaft is scuffed or the seals are worn.

For an accurate diagnosis, use the test:

1. Turn off the engine and shake the steering wheel left and right with an amplitude of 5–10 cm. Play or knocking is a sign of a problem.
2. Start the car and repeat the action. If the knocking noise disappears, but wedging appears, the power steering pump or clogged filter is to blame.
3. Check the power steering fluid level in the reservoir (should be between MIN And MAX). Dark color or metal particles are a signal to replace the rack.

What happens if you ignore the knocking of the rack?

Prolonged play of the worm shaft bushing leads to breaking the seat in the rack body. In this case, repairs with replacement of the bushing become impossible - a complete replacement of the unit will be required (cost from 40 thousand rubles for the original). In addition, a worn rack may spontaneously change the angle of rotation of the wheels at speed, which is fraught with skidding.

Steering rack diagnostics: tools and algorithm

To check the rack Murano Z51 You don’t have to go to a service station—you can do some of the work yourself. You will need:

• 🔧 A set of sockets and keys (especially 10 mm, 12 mm, 14 mm).
• 🔦 Flashlight or carrying lamp for inspection from below.
• 📏 Feeler gauge for measuring play (or ruler).
• 🧴 Power steering fluid for topping up (original - Nissan PSF or equivalent Mobil ATF 320).

Diagnostic algorithm:

Visual inspection of anthers for cracks and smudges|

Checking the steering play with the engine off (normal: no more than 1–2 cm)|

Measuring the level and condition of power steering fluid |

Listening to knocking noises when rocking the steering wheel with force |

Inspection of the fastenings of the rack to the subframe (the bolts should not be loose)

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Pay special attention anthers slats — their damage leads to dirt and rapid wear. If the boot has cracks, it must be replaced immediately (catalog number: 48532-JM00A for the left side, 48531-JM00A - for the right one).

Symptom	Probable Cause	Remedy
Knocking sound when turning the steering wheel	Worm shaft bushing wear	Replacing a bushing or rack assembly
Power steering fluid leaks	Worn seals or crack in the housing	Repair with replacement of seals or replacement of rack
Stiff steering wheel rotation in one direction	Seizure on the shaft or clogged power steering filter	System flushing, fluid replacement, rack repair
Vibration in the steering wheel when driving	Wheel imbalance or play in the rack	Diagnostics of suspension and rack

Repair vs replacement: which is more profitable for Murano Z51

The cost of a new original rail for Murano Z51 amounts to 35–50 thousand rubles., while repairs cost 8–15 thousand rubles. (depending on the degree of wear). However, repairs are not always advisable. Let's look at the pros and cons of each option:

• ✅ Rail repair:
• 💰 Save up to 70% compared to replacement.
• 🔧 Possibility of replacing only worn parts (for example, bushings or oil seals).
• ⏱️ Faster - takes 2-3 hours (versus 4-5 hours for replacement).
• ❌ Disadvantages of repair:
• ⚠️ Risk of repeated wear if the cause is not eliminated (for example, a faulty power steering pump).
• 🛠️ Requires a qualified craftsman - if assembled incorrectly, the rack may jam.

Replacing the rack is justified in the following cases:

• 🔨 Severe wear of the housing or gear pair (repair is impossible).
• 💧 Multiple power steering fluid leaks due to cracks in the housing.
• 🚗 Mileage more than 200 thousand km - the resource of the slats is coming to an end.

⚠️ Attention: When replacing the rack, be sure to update the power steering fluid and flush the system! Old fluid with metal shavings will reduce the service life of the new rack by 30–40%.

Step-by-step instructions for replacing the steering rack

Replacing the rack with Murano Z51 requires removal of the subframe, so you can’t do without a pit or a lift. If you have little experience, it is better to entrust the work to a service. For self-repair, follow the algorithm:

1. Preparation:
   • Remove the negative terminal from the battery.
   • Set the wheels to the straight position.
   • Drain the power steering fluid from the reservoir and pipes (use a container with a volume of at least 1 liter).
2. Removing the old rail:
   • Disconnect the steering rods from the rack (after marking their position with a marker!).
   • Unscrew the fastenings of the rack to the subframe (4 bolts 14 mm).
   • Disconnect the power steering pipes (be prepared for fluid leaks!).
   • Carefully remove the rail from the bottom (you will need a helper to support it).
3. Installing a new rack:
   • Transfer the mounting bracket from the old rail to the new one (if it is not included in the kit).
   • Install the rack in the reverse order, observing the tightening torques:
     • Bolts for fastening to the subframe - 80–100 Nm.
     • Steering rod nuts - 50–60 Nm.
   • Connect the power steering pipes and fill in new fluid (system volume - ~1 l).
4. Bleeding the power steering system:
   • Start the engine and turn the steering wheel from lock to lock several times.
   • Add fluid to the level MAX and repeat the procedure 2-3 times.
   • Check that there is no air in the system (there should be no “dips” when turning the steering wheel).

Selection of spare parts: original vs analogues

When purchasing a steering rack or components for Murano Z51 owners are faced with a dilemma: overpay for the original or risk analogues. Let's look at the nuances:

Part type	Original (Nissan)	High-quality analogues	Budget analogues
Steering rack assembly	48500-JM00A (45–50 thousand rubles)	Maval (30–35 thousand rubles), TRW (38–42 thousand rubles)	Febi (22–25 thousand rubles) - risk of early wear
Worm shaft bushing	48525-JM00A (1.2–1.5 thousand rubles)	Corteco (800–1000 rub.)	Sasic (400–600 rub.) - short resource
Rack oil seal	48528-JM00A (set 2–3 thousand rubles)	Elring (1.5–2 thousand rubles)	Victor Reinz (RUB 800–1,200) - possible leaks
Rail boot	48532-JM00A (left, 1.5 thousand rubles)	SKF (1–1.2 thousand rubles)	Asam (500–700 rub.) - thin material

When choosing analogues, pay attention to:

• 📦 Complete set — the box must contain all seals, bushings and boots.
• 🔍 Country of manufacture - slats made in Japan or Korea are preferred (for example, Maval produced in South Korea).
• 📝 Guarantee — reliable suppliers provide a guarantee of at least 1 year.

How to distinguish an original rail from a fake?

Original rack Nissan has:

1. Logo Nissan and catalog number stamped on the body (not a sticker!).

2. Clear markings Made in Japan (for Z51 the racks are made at the factory JATCO).

3. The package includes instructions in Japanese/English and branded packaging with a hologram.

Counterfeits often come in white boxes with no markings or with misspelled part numbers.

Prevention: how to extend the life of the steering rack

Steering rack resource Murano Z51 directly depends on driving style and care. By following simple rules, you can delay repairs by 50–80 thousand km:

• 🔄 Change power steering fluid every 60 thousand km or once every 2 years. Use only Nissan PSF or Mobil ATF 320 — other liquids corrode the seals.
• 🚧 Avoid driving through deep potholes at speed - shock loads destroy the rack bushing.
• 🔧 Check the anthers slats at every maintenance. Cracks or breaks are a reason for urgent replacement.
• ❄️ Do not hold the steering wheel in extreme position more than 5 seconds - this creates excess pressure in the power steering system.
• 🛠️ Monitor the condition of the power steering pump - If a hum or vibration appears, check it and replace the fluid.

Pay special attention winter operation. At temperatures below –20°C, power steering fluid thickens, which increases the load on the rack. Before starting the engine in cold weather, it is recommended:

1. Turn the steering wheel several times with the engine off (to “disperse” the fluid).
2. For the first 1–2 km, drive without sharp turns, allowing the system to warm up.

Frequently asked questions about the Murano Z51 steering rack

Is it possible to drive with a knocking rack?

Short-term (up to 1-2 weeks) - yes, but only if the knocking is not accompanied by play or leaks. Driving for a long time with a faulty rack leads to:

• Accelerated wear of steering rods and ball joints.
• Risk of rack jamming at speed.
• Uneven tire wear.

At the first sign of knocking, make an appointment for diagnostics!

How much does it cost to repair a rack at a service center?

The cost depends on the amount of work:

• Bushing replacement — 3–5 thousand rubles. (excluding spare parts).
• Replacing oil seals — 5–7 thousand rubles.
• Overhaul with replacement of gear pair — 12–15 thousand rubles.

In Moscow and the regions, prices may differ by 20–30%. We recommend choosing services that specialize in Nissan.

What kind of power steering fluid to fill in Murano Z51?

Manufacturer recommends Nissan PSF (catalog number KE902-99932). Acceptable analogues:

• Mobil ATF 320 — complete analogue according to the specification.
• Toyota ATF WS - compatible, but requires more frequent replacement.
• Liqui Moly ATF 1100 - Suitable for cold climates.

❌ Prohibited use Dexron II/III — it destroys the rack seals!

How often should the steering rack be checked?

Minimum intervals:

• Visual inspection of anthers - every 10 thousand km.
• Checking play and knocking - every 20 thousand km.
• Replace power steering fluid - every 60 thousand km.

When driving off-road or in very dusty conditions, reduce intervals by 30%.

Is it possible to repair the rack yourself?

Theoretically yes, but:

• Required special puller for disassembling the rack (cost ~3 thousand rubles).
• Needed original spare parts (bushings, oil seals) - analogues may not fit in size.
• High risk incorrect assembly, which will lead to jamming.

If you have no experience, it is better to contact the service. You can only replace the anthers or rods yourself.