Nissan Murano Z51 subframe silent blocks: diagnostics, selection and replacement

Crossover owners Nissan Murano second generation (Z51 body), produced from 2003 to 2008, often encounter a characteristic suspension problem that manifests itself over time. This is the appearance of dull impacts, grinding or knocking when driving over uneven surfaces, which is directly related to the wear of rubber-metal hinges.

These elements, known as silent blocks, perform the critical function of connecting the subframe to the vehicle body. They dampen road vibrations and ensure correct front suspension geometry. When the rubber hardens or breaks, Murano Z51 the ride loses its former smoothness, and the steering becomes less precise.

Ignoring this problem can lead to more serious damage: deformation of the levers, accelerated tire wear, and even wheel alignment problems that cannot be corrected if the supports are heavily worn. Timely replacement of these components will return the car to the factory characteristics of handling and comfort.

Functional purpose and design of units

Subframe on Nissan Murano Z51 is a load-bearing element on which the suspension arms, engine and gearbox are mounted. Subframe silent blocks serve as dampers, separating the rigid metal structure of the subframe and the car body. Their task is to isolate the body from vibrations and shocks transmitted through the wheels.

Structurally, these elements are a metal sleeve pressed into a rubber shell, which, in turn, is located in a metal casing. As the car moves, the rubber compresses and stretches, compensating for changes in the distance between the mounting points. However, over time, rubber loses its elastic properties.

Particular attention should be paid to the rear silent blocks of the front subframe, since they are the ones that experience maximum loads during acceleration and braking. Unlike the front ones, which mainly dampen vertical vibrations, the rear ones work on shear and torsion, which leads to their rapid failure on roads with poor surfaces.

Diagnosis of faults and characteristic symptoms

The wear of silent blocks can be determined by a number of obvious signs that cannot be ignored during operation. The very first signal is the appearance of a knock in the front of the car when driving over small bumps or speed bumps. This sound is often confused with a malfunction of the shock absorbers, but its nature is different.

The second sure sign is deterioration in controllability. If you feel that the steering wheel has become “wobbly” or the car is reluctant to turn, play in the subframe joints may be to blame. It is also possible for the steering wheel to wobble at certain speeds, which indicates a violation of the suspension geometry.

A visual inspection of the subframe under the car may confirm your concerns. Look for signs of rubber rupture, metal bushing falling out, or a strong displacement of the assembly relative to the seat. Even a slight rupture of rubber over time turns into a complete loss of damping properties.

⚠️ Attention: Do not try to ignore a knock in the front suspension, as this can lead to the subframe being torn from the body during a sharp maneuver or emergency braking, which can lead to loss of control over the car.

• A dull metallic knock when driving over potholes and bumps.
• Steering wheel wobble at speeds above 60 km/h.
• Uneven tire wear on the front wheels.
• Noise and vibration transmitted to the body during engine operation.

Sometimes the problem is disguised as a malfunction of other suspension components. It is important to carry out a comprehensive diagnosis so as not to replace the stabilizer struts or ball joints in vain if the root of the evil lies precisely in the silent blocks of the subframe.

Review of manufacturers and selection of spare parts

The spare parts market offers a wide range of options for replacement, from original parts to high-quality analogues. Original number Nissan usually indicates high reliability, but the price may be high and the delivery time may be long. Many owners choose proven analogues that are not inferior in quality, but are cheaper.

Among the market leaders are brands Cotego, Lemförder and TRW. These manufacturers use high quality rubber that is resistant to temperature changes and chemical influences. Their products often outlast original parts in terms of service life, especially in harsh climates.

Budget options from Chinese or Turkish manufacturers may be suitable for temporary use, but their service life is significantly lower. The rubber in such silent blocks often becomes dull after 20-30 thousand kilometers, which forces the owner to contact the service again. Savings here can result in double costs.

• Cotego - excellent balance of price and quality, often installed on the assembly line.
• Lemförder - a premium brand, a standard of reliability for German and Japanese cars.
• 555 — an affordable option with decent performance for city driving.

When choosing, pay attention to the packaging and labeling. A fake can be identified by the quality of the metal casting (irregularities, burrs) and the absence of protective holograms. Rubber must be elastic, without cracks or signs of aging, even on a new part.

What is the difference between polyurethane and rubber silent blocks?

Polyurethane bushings are stiffer than rubber bushings, which improves handling but transmits more vibrations to the body. Rubber provides maximum comfort, but has a shorter lifespan. For the comfort-oriented Nissan Murano Z51, it is better to choose quality rubber alternatives rather than polyurethane unless you are racing.

Preparation for replacement and necessary tools

The process of replacing subframe silent blocks requires careful preparation and the availability of specialized equipment. Self-replacement is only possible if you have a garage with a pit or a lift, as well as a set of professional tools. A regular jack and wrenches will not be enough to do the job efficiently.

You will need: a silent block puller (hydraulic or mechanical), a set of sockets and a torque wrench to tighten the bolts to the correct torque. You also cannot do without penetrating lubricant (WD-40 or an equivalent), since the subframe mounting bolts often stick to the body.

Before starting work, you must raise the car and securely fix it on stands. The engine and subframe will be under a lot of stress, so safety is priority number one. Clear the space under the car from unnecessary items to ensure easy access to components.

Separately, it is worth mentioning the need to remove or loosen some suspension components. Often, to access the rear silent blocks of the subframe, you have to remove the arms or unscrew the anti-roll bar. This adds time to the repair process, but is a must.

⚠️ Attention: Never tighten the subframe bolts until the vehicle is lowered to the ground and the wheels are loaded with the weight of the body. Otherwise, the silent blocks may warp and quickly fail.

If you are not confident in your abilities, it is better to entrust this work to professionals. Incorrect installation can lead to wheel alignment problems and accelerated tire wear, which will incur additional costs.

Step-by-step instructions for replacing components

The process begins with dismantling the wheel and subframe protective shield, if provided for by the design. Next, you need to unscrew the bolts securing the stabilizer bar and suspension arms to the subframe. This will allow the subframe to move down freely when unscrewing its fastenings to the body.

The key step is to unscrew the bolts securing the subframe to the car body. Usually there are four of them: two front and two rear. Use the head on 19 or 21 mm (depending on modification). After unscrewing, the subframe must be carefully lowered onto the stand to remove the load from the silent blocks.

Now you can move on to squeezing out the old silent blocks. Use a special puller that allows you to apply even force to the metal bushing. If a puller is not available, a hydraulic press can be used, but this requires care to avoid damaging the subframe itself.

Before installing new parts, be sure to clean the seats from rust and dirt. Apply a thin layer of lubricant to the outer surface of the new bushing to facilitate pressing. Pressing must be done strictly along the axis, without distortions, so as not to damage the rubber.

• Remove old grease and rust from the seats.
• Apply some grease to the new bushing for easy entry.
• Use a puller to press the part evenly.
• Check installation geometry before tightening bolts.

After replacing all silent blocks, the subframe is lifted into place and attached to the body. The bolts are tightened with pre-tension. The final tightening is carried out only after the car is lowered to the ground and the wheels are on the surface.

Adjusting wheel alignment angles after repair

After replacing the subframe silent blocks, the geometry of the front suspension inevitably changes. Even a microscopic displacement of the subframe by a few millimeters can lead to disruption of the camber and toe angles. Therefore, a visit to the wheel alignment stand is a mandatory stage of work.

Specialists adjust the wheel alignment angles, taking into account the new suspension operating parameters. On Nissan Murano Z51 Toe adjustment is carried out by changing the length of the steering rods, and camber is adjusted by moving the eccentric bolts in the places where the levers are attached.

Ignoring this stage will result in new tires wearing unevenly after just a few thousand kilometers. In addition, the car can pull to the side when driving in a straight line, which creates an emergency situation on the highway.

It is also worth checking the condition of other suspension elements, since wear of the subframe silent blocks is often accompanied by problems in the levers, ball joints and steering ends. Comprehensive diagnostics will help you avoid a repeat visit to the service.

Cost of work and common mistakes

The cost of replacing subframe silent blocks consists of the price of spare parts and labor. On average, a set of high-quality analogs costs from 4,000 to 8,000 rubles per pair. Work in the service can vary from 5,000 to 10,000 rubles, depending on the region and level of service.

One of the most common mistakes is trying to replace only one silent block. This cannot be done, since the load will be distributed unevenly, and the second node will quickly fail. Always change them in pairs or as a set.

Another mistake is using a hammer and pry bar to knock out old bushings. This can lead to deformation of the seat in the subframe, which will make it impossible to install new parts without expensive repairs to the subframe itself.

Also, many owners forget about the need to replace the subframe bolts. They often have stretched or damaged threads, and reusing old bolts can cause them to break off during use.

Parameter	Original (Nissan)	Analogue (Cotego/Lemförder)	Budget option
Average price (pcs)	2500-3500 rub.	1200-2000 rub.	600-900 rub.
Resource (km)	100 000+	80 000 - 120 000	30 000 - 50 000
Rubber material	Special blend	Chemical resistant rubber	Regular tires
Warranty	High	Average	Low

Remember that correct tightening of the subframe bolts after installation on the ground is a critical stage on which the service life of the new silent blocks and traffic safety depend. Saving on this procedure can lead to serious consequences.

How often should subframe silent blocks be checked?

It is recommended to carry out a visual inspection at each maintenance, as well as when the first signs of knocking appear. The average resource is 80-100 thousand kilometers, but on bad roads it can be halved.

Is it possible to drive with worn silent blocks?

You can drive, but it is dangerous. The geometry of the suspension is disrupted, the braking distance increases, and during a sharp maneuver the subframe can shift, which will lead to loss of control. It is not recommended to operate the car in this condition for more than a few days.

Do I need to do a wheel alignment after replacement?

Yes, definitely. Any interference with the subframe fastening violates the wheel alignment angles. Without the correct wheel alignment settings, the tires will wear out very quickly, and driving will become unpredictable.

What tools are needed for DIY replacement?

You will need: a lift or pit, a set of sockets (including extensions), a torque wrench, a silent block puller, penetrating lubricant and stands under the car for safety.

How long does it take to replace?

In a professional service, the work takes 2-3 hours. In a garage environment, if you have experience and tools, the process can take 4-5 hours due to the need to unscrew stuck bolts and adjust parts.