Car rear suspension Nissan Primera P12 has earned a reputation as one of the most reliable and comfortable in its class, but even it requires attention as the mileage accumulates. The service life of factory shock absorbers on this model rarely exceeds 100–120 thousand kilometers, after which characteristic knocking noises begin, deterioration in handling and the car pulls to the side when braking. Timely replacement of rear struts allows you to avoid destruction of other suspension components and maintain the level of comfort declared by the manufacturer.
Many owners Nissan Primera P12 are faced with the problem of incorrect selection of spare parts, since the design of the rear beam has its own characteristics. Unlike the front struts, a design with separate shock absorbers and springs is used here, which simplifies the replacement process, but requires care when working with the mounting bolts. Ignoring signs of wear can result in the rear axle losing traction during emergency braking, creating an emergency situation.
Diagnosis of wear and symptoms of malfunction
You can determine the need to replace rear shock absorbers not only by mileage, but also by a number of visual and behavioral signs. The very first symptom is often a knocking sound when driving over bumps, which sounds like a dull metallic blow. If you notice that the car begins to lean heavily when cornering or becomes "floaty" at high speeds, this is a sure sign that shock absorber strut lost its working properties.
A visual inspection may reveal oil smudges on the shock absorber body, which indicates a violation of the seal seals. It is also worth paying attention to the condition of the rubber bumpers and anthers - their destruction often accelerates the wear of the rod itself. Don't forget about uneven tire wear: if the rubber wears out in spots or waves, this directly indicates that the wheel does not adhere well to the road due to a faulty suspension.
- 🔍 Conduct a swing test: press on the corner of the body and release - if the wheel swings more than twice, the strut is dead.
- 🛠 Inspect the upper support of the rack: play in the body cup is often accompanied by a characteristic click when passing speed bumps.
- ⚙️ Check the condition of the silent blocks of the beam: they often fail before the shock absorbers, but they change along with them.
⚠️ Attention: If you notice oil leakage even in small quantities, do not delay repairs. Oil leaks due to wear of the oil seal, and as soon as its level drops critically, the shock absorber will stop working instantly, which can lead to a breakdown of the suspension.
Selection of spare parts: original or analogues
There is a huge selection of options on the auto parts market for Nissan Primera P12, which puts the owner before a difficult choice between an expensive original and budget analogues. Original brand stands Nissan (or their supplier Kayaba) provide the perfect balance of comfort and handling, but their price often deters drivers. Alternatives include quality brands such as Sachs, Bilstein or KYB (Excel-G series), which offer decent quality at a more affordable price.
When choosing, you should take into account the operating conditions of your car. If you drive mainly on smooth city roads, you can choose softer shock absorbers for maximum comfort. However, for rough roads and frequent trips outside the city, it is better to opt for reinforced models with stiffer damping.
| Manufacturer | Series/Model | Approximate price | Characteristics |
|---|---|---|---|
| Nissan (Original) | 48510-AL40A | High | Perfect balance, long service life |
| Kayaba | Excel-G (Gas-oil) | Average | Good comfort, soft operation |
| Sachs | Super Touring | Medium/High | Stiffer than original, excellent stability |
| Monroe | OESpectrum | Average | An affordable option for a relaxed ride |
| Asso | Standard | Low | Budget solution, average resource |
- Original (Nissan)
- Kayaba (Japan)
- Sachs (Germany)
- Budget analogues
Tools and preparation for work
Before starting work, it is necessary to prepare the workplace and the necessary tools, since the mounting bolts on Nissan Primera P12 may be stuck and require significant effort to unscrew. You will need a standard set of wrenches, including 12, 14, 17 and 19 mm sockets, as well as a heavy-duty ratchet with an extension. Pay special attention to the spring remover if you plan to change not only the shock absorber, but also the upper support, although in most cases you can do without disassembling the spring.
For safe operation, the vehicle must be securely secured. Use a jack, but be sure to place secure supports or stands under the body. Working under a machine supported solely by a hydraulic jack is strictly prohibited. Also be sure to remove the battery if access to the top of the strut mount is difficult and requires removal of the battery or air intake.
☑️ Preparation for replacement
- 🔧 Keys: set of socket heads (12, 14, 17, 19 mm) and wrenches.
- 🛢 Spray lubricant: penetrating lubricant such as WD-40 or equivalent for treating threaded connections.
- 🔨 Hammer and pry bar: for knocking out stuck fingers and moving levers.
⚠️ Attention: Before unscrewing the shock absorber mounting bolts, be sure to lock the lever. If you simply unscrew the bolt without locking it, the spring will suddenly release, which could result in injury or body damage.
What to do if the bolts do not come off?
If the bolts are stuck, do not try to remove them with maximum force right away. It is best to warm up the joint with a hair dryer or blowtorch, then pour plenty of penetrating lubricant and wait 15-20 minutes. Sometimes a sharp blow with a hammer on the head of the bolt helps. As a last resort, you will have to use a grinder to cut the bolt, but this is risky for the threads in the lever.
Step-by-step replacement instructions
The replacement process begins by lifting the rear of the car and removing the wheel. After this, you need to unscrew the nut of the upper shock absorber mounting. On Nissan Primera P12 This bolt is often hidden under a plastic trim or in a trunk well, so removal of the trim may be necessary. Hold the rod with a 6 or 7 mm wrench to prevent it from turning, and unscrew the nut with a 12 mm socket.
Next we move on to the bottom of the mount. Remove the two bolts connecting the shock absorber to the beam. This often uses a bolt with a nut that can rotate inside the lever, so it is better to use two wrenches or a special tool to hold the bolt. After unscrewing the bolts, carefully remove the old shock absorber, overcoming the resistance of the spring.
Installing the new part is done in the reverse order. It is important not to tighten the bolts immediately after lowering the car, since the rubber of the silent blocks may be twisted. First tighten the fasteners while the vehicle is on its wheels, or use the "pre-tightening" method and then check the torque.
Момент затяжки болтов крепления амортизатора к балке: 100-120 Нм
Момент затяжки гайки штока амортизатора: 40-50 Нм
Proper tightening of the suspension bolts should be done after installing the wheel and lowering the vehicle to the ground, so as not to twist the rubber suspension elements under load.
Frequent errors and operating nuances
One of the most common mistakes is replacing shock absorbers on only one side. Even if the second strut seems to be in good working order, its service life is already running out, and an imbalance in the suspension will lead to unstable behavior of the car. Always replace shock absorbers in pairs on the same axle. Also, many owners forget about replacing the upper support bearings, which when worn out begin to make noise and knock, simulating a malfunction of the shock absorber itself.
Another mistake is using too stiff sports racks on a standard beam without modification. This can lead to knocking noises on small irregularities and accelerated destruction of the body due to the transmission of vibrations. For everyday use Nissan Primera P12 Medium-hard gas-oil shock absorbers are best suited to maintain comfort and provide decent handling.
- 🚫 Do not use springs from other models, even if they fit in size - this will disrupt the suspension geometry.
- ✅ Be sure to replace the anthers and bump stops along with the struts, as their resource often coincides with the shock absorber resource.
- 🔄 After replacement, be sure to check the wheel alignment, although this is not always critical on a beam rear suspension.
⚠️ Attention: Never use pneumatic nuts to tighten suspension bolts! Due to the high speed and inertia of the tool, you can easily strip the threads or overtighten the bolt until the metal is distorted, causing it to break while running.
Additional advice and service
After installing new struts, it is recommended to carefully monitor the operation of the suspension. Drive on different types of surfaces and listen to extraneous sounds. If the knocking noise remains, check the quality of tightening of the bolts and the condition of the silent blocks of the beam. Sometimes the problem is not in the shock absorbers, but in the broken rubber-metal hinges of the rear beam, which require replacement.
Regular suspension maintenance includes periodically checking the condition of the boots and lubrication of threaded connections. This will extend the life of new parts and make repairs more affordable in the future. Do not ignore recommendations for replacing consumables, as saving on little things can result in costly repairs of the entire rear axle.
If you are not confident in your abilities or do not have the necessary equipment, entrust the replacement of racks to professionals. High-quality installation is not only comfort, but also your safety on the road. Remember that the suspension Nissan Primera P12 is very sensitive to build quality, and even a small mistake can lead to serious consequences.
Frequently asked questions (FAQ)
How long does it take to replace rear struts on a Nissan Primera P12?
If you have experience and the right tools, replacing two rear struts takes 1 to 2 hours. If the bolts are stuck or the trunk trim needs to be removed, the time may increase to 3 hours.
Is it possible to change shock absorbers one at a time?
Technically possible, but highly not recommended. Shock absorbers wear evenly, and replacing only one strut will lead to suspension imbalance, poor handling and accelerated wear of the new part.
Do I need to do a wheel alignment after replacing the rear struts?
The rear beam on the Nissan Primera P12 does not have camber and toe adjustments. Therefore, after replacing the shock absorbers, it is not necessary to perform a wheel alignment if the silent blocks of the beams or levers were not affected.
What tools are needed to replace the top support?
No special equipment is required to replace the top mount without removing the spring. 12 mm and 6-7 mm keys are sufficient. If you are replacing the entire assembly, the process is simplified, but you will need access to the top of the rack from the trunk.