Car suspension system Nissan Primera P12 known for its reliability, but over time, even the toughest components require maintenance. Rear shock absorbers are a critical element responsible for driving comfort and safety. If you notice clunking noises when driving over bumps, body roll, or uneven tire wear, it's time to consider replacement.
The procedure for replacing the rear struts on this model has its own characteristics related to the design of the rear beam and the mounting of the springs. Many car owners try to do this work themselves in order to save on service costs, but without knowing the nuances, threaded connections can be damaged or the unit can be assembled incorrectly.
In this article we will analyze in detail which parts are best to choose, how to prepare for work and what tools you will need. We will also look at common mistakes that beginners make and give clear recommendations for tightening fasteners. Properly performed replacement ensures that your Nissan Primera P12 will behave predictably on the road again.
Wear diagnostics and component selection
Before proceeding with dismantling, you must make sure that replacement is necessary. Wear of the rear shock absorbers is often accompanied by a characteristic sound, which intensifies when driving over speed bumps or asphalt joints. Visual inspection may reveal oil leaks on the housing shock absorber, which is a direct sign of failure.
When choosing new parts, it is important to understand the difference between budget analogues and original spare parts. For Nissan Primera P12 Shock absorbers from trusted brands such as KYB, Sachs or Monroe are excellent. Original racks are often marked as shock absorber struts and have specific markings corresponding to factory catalog numbers.
- 🔍 Check the condition of the anthers and bumpers - their replacement is required when installing new racks.
- 🛠️ Don't save on upper supports bearings, as they often jam on old shock absorbers.
- 📦 It is recommended to change shock absorbers in pairs to maintain suspension balance.
The quality of components directly affects the service life of the entire rear suspension. Cheap analogues may not be able to withstand the loads and start knocking after just a few thousand kilometers. Therefore, before purchasing, be sure to check the article numbers with the catalog for your specific body type.
⚠️ Attention: Installing new shock absorbers without replacing boots and bump stops will lead to their rapid destruction due to dust and dirt getting on the rod.
Necessary tools and preparatory work
To complete the job successfully, you will need a set of tools to have on hand before starting the process. The standard set includes a 14, 17, 19 and 22 mm socket, as well as a wrench to hold the shock absorber rod. Without a special wrench or a gas wrench, it will be extremely difficult to unscrew the top nut of the rod.
In addition to hand tools, be sure to prepare a jack and reliable stands. Working under a raised vehicle, relying only on a jack, is strictly prohibited for safety reasons. You will also need penetrating lubricant if the fasteners are rusty.
- 🔑 Set of ratchet wrenches and sockets (14, 17, 19, 22 mm).
- 🛠️ A key for holding the rod or a gas key (for the upper nut).
- 🧴 Penetrating lubricant (WD-40 or equivalent) and a hammer.
Before starting work, the vehicle must be placed on a flat surface. The rear of the machine must be carefully lifted and secured. Remove the rear wheels to gain free access to the suspension components. Inspect the mounting bolts and apply lubricant if necessary.
- Set of keys
- Hydraulic puller
- Pneumatic tools
- Standard home kit
Step-by-step instructions for dismantling the old rack
We begin the process by freeing access to the shock absorber mount in the wheel arch. On some trim levels Nissan Primera P12 It may be necessary to remove the plastic fender liners or bend the metal shield. This is necessary to gain full access to the top mount.
The next step is to unscrew the bottom of the shock absorber. The bolt attaching to the rear beam often sticks, so use a long wrench for leverage. If the bolt does not budge, gently tap the head with a hammer to knock off the rust, but be careful not to damage the threads.
☑️ Preparation for dismantling
After unscrewing the lower fastening, move on to the upper part. Here you need to fix the shock absorber rod so that it does not rotate together with the nut. Holding the rod with a wrench, unscrew the nut securing the upper support to the body. Be careful as the spring is under tension.
Carefully remove the shock absorber from the arch. Be careful not to damage any wiring or hoses that may run nearby. The old stand may be heavy and unstable, so use your other hand to support it when removing it.
⚠️ Caution: Do not attempt to unscrew the top nut if the shock absorber rod is not secured - this may cause damage to the threads or injury to your fingers.
Installing new shock absorbers and assembling the unit
Before installing new parts, be sure to transfer all original elements to them: bumpers, boots and upper supports, if they have not been replaced. Make sure upper support rotates freely and has no backlash. If the support is old, it is better to replace it immediately to avoid knocking in the future.
Install the new shock absorber in reverse order. First, slide the rod through the hole in the body, then tighten the top nut, but do not tighten it all the way. This will allow the rack to assume its natural position when lowering the vehicle.
- ✅ Check the alignment of the holes for the mounting bolts to the beam.
- 🔩 Use new bolts if the old ones show signs of deformation or corrosion.
- ⚙️ Observe the tightening torque of all fasteners according to the specifications.
Once the bottom bolt is inserted and tightened, lower the vehicle onto its wheels. The final tightening of all bolts must be done under load, that is, when the weight of the car presses on the suspension. This will prevent premature wear of silent blocks and rubber bushings.
Features of bolt tightening
The rear beam bolts must be tightened with full suspension load. If you tighten them by weight, the rubber bushings will be twisted, which will lead to rapid destruction and knocking.
Typical errors and technical nuances
One of the most common mistakes is not tightening the top stem nut correctly. If you overtighten it, you can damage the upper support bearing, which will lead to the wheel jamming when turning. If you don’t tighten it enough, a characteristic knock will appear when driving over uneven surfaces.
Another common problem is ignoring the condition of the springs. If the spring has cracks or severe corrosion, it must be replaced. Installing a new shock absorber on an old, weakened spring will not give the desired result and may even worsen handling.
It is also important not to confuse the left and right racks if they have different markings or rod lengths. On Nissan Primera P12 the left and right sides are often symmetrical, but it is better to double-check with the catalog to avoid errors during assembly.
⚠️ Attention: Do not use a gas wrench to hold the shock absorber rod if it is chrome plated - this may leave deep scratches through which corrosion will occur.
All rear suspension bolts should be tightened only after the vehicle has been lowered onto its wheels to prevent twisting of the rubber elements.
Cost of work and choice of service
If you decide to contact a specialized service, the cost of replacing the rear struts will depend on the region and level of the workshop. On average, the price of work for one side ranges from 1000 to 2000 rubles. This amount usually includes dismantling, installation and tightening of fasteners.
The cost of the spare parts themselves varies widely. Original shock absorbers can cost from 4,000 to 7,000 rubles apiece, while high-quality analogues are available at prices from 2,000 to 3,500 rubles. Don't forget to take into account the cost of additional elements: boots, bumpers and top support.
| Component | Original (approximate price) | Analog (approximate price) |
|---|---|---|
| Rear shock absorber | 5500 - 7500 rub. | 2200 - 3800 rub. |
| Upper support | 3500 - 4500 rub. | 1500 - 2500 rub. |
| Boot with bumper | 1800 - 2500 rub. | 800 - 1200 rub. |
| Mounting bolt | 300 - 500 rub. | 100 - 200 rub. |
When choosing a service, pay attention to the guarantee for the work performed. A good workshop will provide a guarantee for at least 3-6 months. Also find out if the job includes load tightening the bolts, as this is a critical step.
Before visiting the service center, call and check whether the necessary spare parts are in stock - this will save your time and allow you to begin repairs immediately.
Frequently Asked Questions
Is it possible to change shock absorbers one at a time?
Theoretically it is possible, but it is strongly recommended to change them in pairs. Rear suspension wear usually occurs evenly, and replacing just one strut can result in imbalance and uneven tire wear.
Do I need to do a wheel alignment after replacing the rear struts?
On Nissan Primera P12 the rear suspension has a beam, the geometry of which does not change when replacing shock absorbers. The wheel alignment of the rear wheels is not adjustable, so the procedure is not necessary if the beam elements have not been damaged.
How often should rear shock absorbers be replaced?
The average service life is 80-100 thousand kilometers. However, the actual resource depends on operating conditions, the quality of the road surface and driving style.
Is it possible to use gas shock absorbers instead of oil ones?
Yes, gas shock absorbers (gas-oil) are often a better alternative for sporty driving, providing a firmer response to bumps. For a comfortable ride, it is better to choose high-quality oil or gas-oil struts.
What to do if the nut on the rod does not unscrew?
If the nut is stuck, use a penetrating lubricant and heat it with a hair dryer or blowtorch (be careful with plastic). You can also use a special wrench for the rod and a long wrench to increase the leverage.