Nissan Almera H16 is a legendary sedan, which for many years has remained one of the most popular cars on the secondary market in Russia and the CIS countries. However, its main Achilles heel is the body's tendency to corrosion, especially in areas of increased accumulation of moisture and reagents. Thresholds are one of the most vulnerable parts of the structure, since they are in direct contact with the road and are constantly exposed to salt and dirt.
If you notice that the metal under the paint has begun to bubble or through holes have appeared, repairs cannot be postponed. Ignoring the problem will lead to loss body rigidity, which will affect controllability and safety. In this article we will look in detail at how to correctly diagnose the problem, select materials and perform replacement of thresholds on your own or with the help of specialists.
Causes of corrosion and diagnosis of body condition
Corrosion on Nissan Almera N16 often begins unnoticed. The owner may only notice a small spot of rust on the paint, which grows over time. The main reason lies in the design of factory thresholds and the lack of sufficient protection in factory conditions. The inner cavity of the thresholds is often left unprotected or covered with a layer that cracks over time.
In winter, when roads are abundantly sprinkled with reagents, the situation is aggravated many times over. Aggressive chemicals penetrate through microcracks in the paintwork and begin to corrode the metal from the inside. It is important to regularly inspect the car, especially after the winter season, paying attention to hidden cavities and fastening areas.
For an accurate diagnosis, you will need a thin screwdriver or awl. Carefully pierce suspicious areas. If the tool enters the metal too easily or you feel that the metal is crumbling, it means structural integrity broken. You should not rely only on visual inspection, since the metal may look intact on the outside, but turn into dust on the inside.
- π Wash your car regularly, paying special attention to the bottom and arches.
- π‘οΈ Use anti-corrosion compounds to treat internal cavities.
- π« Do not leave your car standing for a long time in puddles with reagents.
β οΈ Attention: If you find through-through corrosion, do not try to simply weld the hole. The affected area must be completely removed, otherwise the rust will continue to spread under the new layer of metal.
Choice of materials: welding, overlays or repair inserts
There are several approaches to solving the problem of rotten thresholds. The most reliable way is complete threshold replacement using new elements. For this purpose, both original spare parts and high-quality analogues from trusted manufacturers are available on the market. However, it is worth considering that original parts can be expensive and take a long time to order.
An alternative option is repair inserts. They allow you to replace only the rotten part, preserving entire sections of the factory metal. This is a more economical option, but it requires a highly qualified welder. The third method, which is often chosen for a temporary solution or on a limited budget, is to install external door sills.
It is important to understand the difference between these methods. The covers simply cover up the rotten metal, creating the illusion of repair, but do not restore the rigidity of the body. If you're planning on selling your car soon, this could work. However, for long-term use, full replacement of sections followed by high-quality anti-corrosion treatment.
- π οΈ Welding: maximum rigidity, requires professionalism.
- π§ Inserts: saving material, complex preparation of joints.
- π Overlays: quick installation, does not restore geometry.
- Complete replacement with new ones
- Installation of repair inserts
- Installation of overlays
- I will contact the service
Preparing the car for body work
Before starting work, it is necessary to carefully prepare the workplace and the car itself. You will need a garage with good lighting, a lift or pit, and a set of metal cutting tools. Do not attempt complex welding work outdoors or on a regular garage floor as this may result in personal injury or damage to the vehicle.
The first step is to dismantle all elements that interfere with access to the threshold. This includes removing bumpers, fender liners, and removing seats and trim if welding is planned on the inside. Be sure to turn off batteryto avoid short circuits when operating power tools.
Cleaning old metal is a critical step. Using a grinder and stripping discs, remove all rust, paint and old sealant to bare metal. If you leave even a small piece of corrosion, the destruction process will begin again very quickly. Surface preparation takes up to 70% of the time of the entire work, but the durability of the repair depends on it.
βοΈ Preparation for replacing thresholds
β οΈ Attention: When working with an angle grinder and welding, use personal protective equipment: goggles, mask and gloves. Small metal shavings can cause serious eye damage.
Welding technology and installation of new elements
The process of installing new thresholds requires precision and care. First, the body geometry must be leveled using a hydraulic stand or jacks to prevent distortion during welding. Apply markings to the body to accurately determine where to cut and join new parts. Use welding inverter or semi-automatic, adjusted to the thickness of the metal.
Welding should be carried out using the spot method or short seams to avoid overheating of the metal. Overheating can cause the metal to βleadβ and the geometry of the body will be disrupted. After each welding point, allow the metal to cool slightly. It is important to ensure that the seams are sealed, otherwise moisture will again get inside the structure.
After completing the welding work, all seams must be processed. Use anti-corrosion primer and putty to level the surface. Apply materials in layers, allowing each to dry. The final stage will be painting, which should match the color of your car. To do this, it is best to contact a specialized painting workshop.
How to cook with dots?
Spot welding avoids overheating of the metal. Make seams 1-2 cm long at intervals of 3-4 cm. After one section has cooled, move on to the next so that the metal does not deform from the high temperature.
Don't forget about treating internal cavities. Even if everything looks perfect on the outside, the inside of the threshold must be covered with a high-quality composition. Use engine compartment or special syringes for applying anticorrosive agent to hard-to-reach places. This will create an additional barrier against moisture and salt.
Comparison of the cost of repair and independent work
Many owners wonder what is more profitable: contacting a specialized service or doing the repairs themselves. The cost of work at a car service center consists of the price of spare parts, the work of a welder, painter and primer. Depending on the region and the quality of spare parts, the price can vary from 15,000 to 40,000 rubles for a pair of thresholds.
Do-it-yourself repairs require purchasing tools and materials. If you already have a welding machine and the skills to use it, you can save a significant amount. However, keep in mind that incorrect repairs can cost more than subsequent repainting and correction of errors. The table below shows the approximate cost of materials and labor.
| Name | Price for spare parts (RUB) | Price for service work (RUB) | Difficulty of execution |
|---|---|---|---|
| Front threshold (set) | 3 500 - 6 000 | 3 000 - 5 000 | Average |
| Rear threshold (set) | 3 500 - 6 000 | 3 000 - 5 000 | High |
| Primer and paint | 2 000 - 4 000 | 5 000 - 8 000 | High |
| Anti-corrosion treatment | 1 000 - 2 000 | 3 000 - 5 000 | Low |
β οΈ Attention: Cheap Chinese thresholds may have inaccurate geometry, which will complicate their installation and require additional work on fitting.
If you decide to do the renovations yourself, consider the time you will spend. The process may take from 3 to 7 days depending on your experience and equipment availability. Completion deadlines The service time is usually 3-5 days, but this depends on the workload of the workshop.
Before purchasing spare parts, be sure to try them on your car. Sometimes even the same model may have differences in design depending on the year of manufacture and configuration.
Final finishing and prevention of re-corrosion
Once welding and painting are completed, it is important to pay attention to the final finishing. All joints must be carefully sanded and treated with sealant. Use quality materials that will not peel off over time. Done correctly seam processing - a guarantee that moisture will not get inside the structure.
To prevent re-corrosion, it is recommended to regularly inspect the thresholds and, if necessary, renew the protective coating. Once a year it is useful to chemically wash the underbody and sills to remove accumulated dirt and reagents. It is also worth paying attention to anti-gravel film, which can be glued to the outer part of the thresholds.
The film will protect the paint from chips and scratches, which are the main sources of corrosion. It is almost invisible visually, but significantly extends the life of the paintwork. If you notice that the film has begun to peel off or moisture has accumulated underneath it, it needs to be replaced. Timely care will allow you to forget about the problem of rust for many years.
- πΏ Wash your car regularly using specialized shampoos.
- π‘οΈ Apply protective wax compounds to the body once every six months.
- π§ Check the condition of the anticorrosive in hidden cavities once every 2 years.
Frequently asked questions about repairing Nissan Almera thresholds
Is it possible to replace the sills without removing the seats?
Theoretically possible, but highly not recommended. Without removing the seats and floor covering, you will not be able to properly process the internal cavities and check the quality of welding. In addition, sparks from welding can damage the interior.
How long does it take to completely replace thresholds?
If you have experience and equipment, the process takes from 3 to 5 days. Including preparation, welding, filling, painting and drying. The service time may be longer due to the queue for work.
Which welding machine is better to use?
For body work, a semi-automatic welding machine operating on carbon dioxide or a mixture of gases is best suited. It provides a better and neater seam than a conventional inverter.
Do I need to remove the bumpers when replacing the sills?
Yes, the bumpers must be removed to access the front and rear rocker panels. This also prevents accidental damage to the plastic when welding or cutting metal.
What to do if the thresholds are rotten to holes?
If the metal is completely destroyed, the only solution is to completely replace the sections. Repair inserts or patches are ineffective in such cases, as they will not provide the necessary rigidity and tightness.
Properly performed door sill replacement restores the vehicle's body rigidity and safety, extending its service life for many years.