Owners of the legendary sedan Nissan Primera P11 Often faced with the problem of sagging or breaking the back door. This body element, popularly called the trunk lid, not only performs an aesthetic function, but also ensures the tightness of the interior, protecting it from precipitation and dust. Considering the age of cars of this model, many parts are already worn out, which requires either expensive restoration or replacement with an analogue.
Often, owners ignore minor faults, such as weak lifting or creaking hinges, bringing the situation to a critical point. As a result, the cover may fall completely onto your hands or, worse, damage the rear bumper when opening. Understanding the design and knowing weak points Nissan Primera P11 allows you to prevent such incidents and save significant money on body repairs.
Repairing or replacing this unit is a doable task even in a garage, if you have the necessary tools and knowledge about the specifics of fastening at hand. In this article we will analyze in detail all aspects of rear door maintenance, from gas lift diagnostics to painting a new element.
Design features and typical problems of P11
trunk lid Nissan Primera P11 has a design typical for sedans of the late 90s. It is mounted on two massive hinges, which are connected to the body through special brackets. Inside the metal shell is the trim, locking mechanisms and brake light wiring. The main problem that car owners face is metal corrosion in the hinge area and deformation of plastic fasteners.
Over time, the metal of the hinges gets tired and the lid begins to sag. This causes the lock to no longer align with the mate on the bumper. As a result, the door either does not close completely or closes with enormous force. In addition, the rubber seal often breaks, which causes water to enter the cabin and subsequent corrosion of the trunk bottom.
Another weak point is the locking mechanism. The plastic gears inside the lock wear out over time, and the cable stops transmitting force from the cylinder or electric drive. If you notice that the handle opens, but the lid does not budge, most likely the problem is in this unit, and not in the gas lifts themselves.
Diagnostics of gas lifts and replacement of stops
The most common reason for complaints about a “heavy” or “falling” lid is exhausted gas lifts. IN Nissan Primera P11 they are under high pressure, and over time the gas gradually leaves them. Checking their condition is very simple: open the trunk and release the lid. It should stop smoothly, without jerking, in the upper position.
If the cover falls on its own or cannot support the weight, it will need to be replaced. Old stops often have signs of corrosion on the rods and oil leaks, which are signs of their final failure. When purchasing new parts, be sure to pay attention to the length and compression force, since not all universal gas lifts are suitable for this particular model.
The replacement process does not require sophisticated equipment, but it does require caution. The gas rod is under tension, and if dismantled incorrectly, it can fly out with great force. Use special fasteners or reliable tools to remove circlips to avoid personal injury and damage to body paint.
⚠️ Attention: Never try to disassemble the gas lift yourself or drill into it! This may cause the cylinder to explode due to high internal pressure and cause serious injury.
Before purchasing new stops, measure the distance between the centers of the fasteners in the open and closed state. This is critically important, since a deviation of even 5-10 millimeters can make the normal functioning of the mechanism impossible. Some owners install reinforced stops to compensate for the weight of additional sheathing or sound insulation.
- Factory original
- Reinforced analogues
- Universal with adjustment
- Spring (old method)
Repair and adjustment of trunk hinges
If replacing the gas lifts did not help, and the lid still sags, the problem lies in the hinges. The metal from which they are made loses its rigidity over time, especially in places where it is welded to the body. Correcting the situation often requires not a complete replacement of the hinges, but their correct adjustment or straightening.
The adjustment process begins with loosening the bolts securing the hinges to the cover and to the body. You will need to slightly raise or lower the lid to ensure that the gaps line up perfectly around the perimeter. This requires patience and a helper as the cover is heavy and can move abruptly when the bolts are loosened.
In some cases, replacing the mounting bolts with longer ones or using metal spacers to compensate for play helps. If the metal of the hinge is critically deformed, it will have to be straightened using a hydraulic jack or sledgehammer, which requires pinpoint precision so as not to completely break the part.
☑️ Preparing to adjust the hinges
Choice: original cover, used or analogue
When repairs become impractical due to severe corrosion or deformation of the metal, the only option is to replace the entire cover. In the spare parts market for Nissan Primera P11 There are three main options: an original part from disassembly, a new analogue from a third-party manufacturer, or a refurbished cover.
An original disassembled part is the best choice in terms of price/quality ratio, but it is difficult to find it in good condition. Most used covers have dents, scratches or signs of repainting. Be sure to inspect the inside of the lid for rust, which is often hidden under a layer of sealant.
New analogs are often cheaper than the original, but their metal quality may be lower. Thin metal bends more easily, and the paint on such parts often peels off after a couple of years of use. Remanufactured caps can be a great solution if they have been professionally primed and painted to match the body color.
| Cover type | Average cost | Pros | Cons |
|---|---|---|---|
| Used Original | 5,000 - 15,000 rub. | Ideal geometry, native metal | Difficult to find ideally, paintwork defects are possible |
| New Analogue | 10,000 - 20,000 rub. | New condition, warranty | Thin metal, holes do not always match |
| Restored | 15,000 - 25,000 rub. | Color restored, corrosion eliminated | High price, quality depends on the artist |
| Weldment | 20,000+ rub. | Can be made to order | Long wait, risk of geometry errors |
When purchasing a used cover, always check the condition of the inner arch for hidden corrosion, as this is the most vulnerable spot of the P11 body.
Installation and painting of a new element
After you have purchased a new or refurbished cover, the installation phase begins. Before starting work, it is necessary to transfer all elements of equipment to the new part: lock, cylinder, cables, glass, wiper and wiring. This is a labor-intensive process that requires care, especially when working with fragile plastic clips.
If you chose an unfinished part, you will need to paint it. First you need to clean the surface down to the metal, apply an anti-corrosion primer, and then a layer of enamel. It is important to use paint that matches the color code of your car, as even small variations will be visible in the sun. Proper surface preparation is the key to ensuring that the new cover will not rust after six months of use.
The cover is installed on the body using hinges and bolts. Use a torque wrench to avoid stripping the threads and to tighten the fasteners to the correct torque. After installation, be sure to check the operation of the lock, the tightness of the seal and the operation of the windshield wiper.
Checklist for transferring equipment
Remove the license plate|Remove the wiper and glass|Remove the lock and cylinder|Reconnect the brake light wiring
Caring for the mechanism and extending its service life
To avoid frequent repairs, it is necessary to regularly maintain the trunk lid mechanism. Once every six months, clean the hinges and lock from dirt and old grease. Use special cleaners for this, and then apply new grease that is resistant to low temperatures.
Pay special attention to rubber seals. Over time, they harden and crack, losing their sealing properties. Lubricate them with silicone grease or a special rubber spray to ensure they remain flexible and fit tightly to the body.
Check the condition of the drains in the hinge area. If they are clogged with dirt or leaves, water will accumulate and enter the body, causing corrosion. Cleaning these channels only takes a couple of minutes, but can save you thousands on auto body repairs in the future.
Use silicone grease on the seals not only for protection, but also to prevent them from freezing to the body in winter, which often leads to the rubber breaking when opening.
Frequently asked questions and answers (FAQ)
Why doesn't the trunk lid close all the way?
Most often this is a problem with the lock or the displacement of the mate on the bumper. Try loosening the bolts securing the mating part and moving it up or down a little until it closes easily. Also check if the lock cylinder is worn out.
Is it possible to install an electric drive on the P11 cover?
Yes, it's possible. There are ready-made kits for installing an electric trunk drive on Nissan Primera sedans. However, it will be necessary to modify the wiring and install additional mechanisms, since the standard cover does not provide such equipment.
How to remove the trunk lid completely?
To remove it, you need to open the trunk, unscrew the bolts securing the hinges to the body and to the lid itself. It is best to do this with two people to carefully hold the heavy part and not scratch the bumper. Remember to disconnect the wiring before complete dismantling.
What to do if the plastic lining inside is cracked?
The plastic casing can be glued with a special glue for plastic or a soldering iron from the back. If the crack is large, it is better to replace the entire casing, as the repair may look unsightly. Used versions in good condition are often found.