Replacing rear shock absorbers Nissan Primera P12

The Nissan Primera P12 is a car that has earned a reputation as a reliable and comfortable sedan or station wagon, but over time the suspension begins to require attention. The rear multi-link suspension of this model has a complex design, which makes the procedure for replacing shock absorbers more labor-intensive compared to simple beams.

If you hear characteristic knocking noises when driving over bumps or notice a deterioration in the stability of the car at high speed, most likely the problem lies in wear rear shock absorbers. Ignoring this problem can lead to rapid wear of other suspension components and even affect driving safety.

In this article we will look in detail at how to do it yourself replacing rear shock absorbers on Nissan Primera P12, what tools will be needed and what to pay special attention to when choosing spare parts.

Signs of wear and diagnostics of the rear suspension

You can determine the need to replace shock absorbers not only by knocking noises, but also by indirect signs of the car’s behavior on the road. Nissan Primera with a mileage of more than 100 thousand kilometers, it often begins to “float” when changing lanes, and when braking sharply, the front part nods strongly.

A visual inspection also provides a lot of information. If you see oil stains on the shock absorber body, this is a sure sign that O-rings lost seal. A dry shock absorber may look good from the outside, but inside its rod may already have play.

Also pay attention to the condition of the springs. Often together with shock absorber The springs are also changed, since over time they “get tired” and sag, changing the vehicle’s ground clearance. If the spring has cracks or severe corrosion, its replacement is required to maintain the suspension geometry.

Pay special attention to the condition of the silent blocks of the levers. The P12 rear suspension uses a complex multi-link design, and wear on the rubber-to-metal joints often masquerades as a problem with the shock absorber.

Selecting suitable spare parts: Original or analogue?

Spare parts market for Nissan Primera P12 offers a huge selection of options, from cheap low-quality products to premium solutions. It is important to understand that the rear suspension of this model is very sensitive to stiffness and stroke.

Original parts Nissan (parts code often starts with 54000) provide the best balance between comfort and controllability, but their cost can be significantly higher than their analogues. Many owners choose high-quality analogues from brands such as Kayaba (Kayaba Ultra SR or Excel-G), Sachs or Monroe.

When choosing analogues, avoid the cheapest offers from unknown manufacturers. Cheap shock absorber may fail after 10-15 thousand kilometers, and its operation will be accompanied by extraneous noise that will not disappear even after replacement.

If you often drive on bad roads, it makes sense to consider reinforced versions of shock absorbers. They are a little stiffer, but last much longer and better absorb large impacts from potholes and speed bumps.

Necessary tools and preparatory work

Before starting work, make sure you have all the necessary tools. For Nissan Primera P12 You will need a standard set of wrenches, but there are also specific points. You will definitely need 12, 14, 17 and 19 mm wrenches, as well as a 24 mm socket to unscrew the stem nut.

Since access to the upper attachment point is often difficult, an extension for the wrench is highly desirable. Also prepare a penetrating lubricant (WD-40 or equivalent), as suspension nuts often stick to the threads due to dirt and moisture.

To lift your vehicle safely, use a reliable hydraulic jack and body stands. Do not rely solely on the jack, as unscrewing the bolts may cause the suspension to shift, causing the vehicle to fall.

In addition to tools, prepare a new set of shock absorbers, new springs (if necessary) and, preferably, new bolts for securing the arms, since the old ones may not be unscrewed or may have damaged threads.

Step-by-step instructions for replacing a shock absorber

The replacement process begins with safely raising the vehicle. Raise the rear of the machine and place it on secure stands. Remove the wheel to access the suspension components. Now you need to remove the lower shock absorber mounting nut, which is located at the bottom, closer to the brake disc.

Use a 19mm socket to remove the bottom nut. If the nut does not budge, generously coat the joint with penetrating lubricant and let it sit for 10-15 minutes. After this, carefully knock out the bolt with a hammer or drift to free the bottom of the shock absorber.

Next we move to the top part. The top nuts are located under the trunk trim. Remove the decorative trims and rubber plugs to gain access to the mounting bolts. Here you will need a 12 mm wrench for the nut and a hexagon or 6 mm wrench to keep the rod from turning.

After unscrewing the top nuts, carefully remove the shock absorber from the body. Be careful not to damage the wiring or plastic parts of the trunk trim. Old shock absorber may be heavy and uncomfortable, so proceed smoothly.

Before installing a new shock absorber, compare it with the old one. Make sure the rod length and mounting points match. Insert the new element into the seat, pre-compressing it if required by the design. Secure the top, but do not tighten the nuts all the way.

Lower the vehicle until the wheels touch the ground, but do not remove the stands completely. This is necessary for the suspension to take its working position. Only after this can the lower and upper bolts be finally tightened to the required torque.

What to do if the stem nut does not unscrew?

If the rod rotates with the nut, use a special tool to fix the rod or insert a hex into the groove at the end of the rod. As a last resort, you can carefully clamp the rod in a vice through soft spacers, but this is risky for a new shock absorber.

⚠️ Caution: Never attempt to remove the rod nut while the shock absorber is compressed or under load. This could cause the rod to suddenly spring back and cause serious injury to your hands or eyes.

Typical mistakes and installation nuances

One of the most common mistakes is incorrect installation of the top stop. In design Nissan Primera P12 A rubber-metal silent block and an upper support are used. If you forget to install the rubber gasket or washer, the shock absorber will become noisy and will quickly fail.

It is also important not to overtighten the lower mounting bolt. Excessive force can deform the bracket on the lever, which will lead to wheel alignment problems. Use a torque wrench to check the tightening torque.

Another mistake is ignoring the condition of the springs. If you change shock absorbers after a mileage of over 150,000 km, the springs may have already lost their elastic properties. Installing new shock absorbers on sagging springs will not give the expected comfort effect.

Don't forget to check the condition of the boot and bump stop. On Nissan These items often come with the shock absorber, but if you are using old ones, make sure they are not torn. A damaged boot will lead to rapid wear of the rod.

Checking the work and final recommendations

After installing all shock absorbers, perform a visual inspection. Make sure there are no oil leaks on the new parts and that all bolts are securely tightened. Spin the wheels to check if the suspension components are touching the brake discs or body.

Take it for a test drive. Pay attention to how the car behaves on uneven surfaces. There should be no knocking sounds, and the body should dampen vibrations quickly and without unnecessary swaying. If you feel vibration in your steering wheel, you may need a wheel alignment.

For Nissan Primera P12 It is typical that after replacing shock absorbers, the camber angle of the rear wheels may change. Although this suspension is not normally adjustable, replacing worn arms or silent blocks may require adjustments to the parameters.

Check the condition of the suspension regularly. Once every 20,000 km, inspect the shock absorbers for leaks and integrity of the rubber elements. This will help avoid costly repairs in the future.

⚠️ Attention: If after replacing the shock absorbers you continue to hear knocking noises, check the condition of the rear suspension arms and their silent blocks. Often the cause of noise lies precisely in them, and not in the shock absorbers.

Frequently asked questions (FAQ)

Do shock absorbers need to be replaced in pairs?

Yes, it is highly recommended to replace shock absorbers in pairs (both rear or all four). This will ensure the same behavior of the suspension on both sides, which is critical for vehicle stability and safety during emergency braking or maneuvering.

Is it possible to drive without rear shock absorbers?

Driving without shock absorbers is technically possible, but extremely dangerous. The car will sway strongly, the braking distance will increase, and the wheel may lose contact with the road on uneven surfaces. In addition, this will lead to rapid destruction of other suspension elements.

What is the service life of the rear shock absorbers on a P12?

The average service life is from 60,000 to 100,000 km, depending on the quality of the roads and driving style. However, a visual inspection is recommended every 20,000 km, since on bad roads they may fail earlier.

Is a wheel alignment necessary after replacing shock absorbers?

When replacing only shock absorbers, wheel alignment is usually not required, since they do not directly affect wheel alignment. However, if control arms or bushings were affected during disassembly, or if you notice uneven tire wear, checking the suspension geometry is mandatory.

What tools are needed to replace the top mounts?

For top mounts you will need a 12mm wrench for the nut and usually a 6mm hex or a special wrench to keep the stem from turning. You will also need an extension to reach the bolts through the trunk trim.