Vehicle operation Nissan Sunny in harsh climates inevitably leads to the appearance of corrosion lesions on the lower parts of the body. Particularly vulnerable places are the thresholds, which take the brunt of the impact from reagents, moisture and mechanical damage when parking. Ignoring even small spots of rust on doorsteps Nissan Sunny can lead to decreased body rigidity and serious safety problems in the event of an accident.
Many owners are faced with the need not just to strip the metal, but to completely replace the element or install protective linings. In this article we will analyze in detail the design features Nissan Sunny different generations, we will consider geometry restoration technologies and offer proven methods of combating corrosion. You will learn how to choose the right components and avoid common installation mistakes.
Design features and types of thresholds on Nissan Sunny
Thresholds on Nissan Sunny They perform not only a decorative function, but are also an integral part of the supporting system of the body. They provide the necessary torsional rigidity and protect the doors from sagging. Depending on the year of manufacture of the model, the design may differ: in early versions these were often removable pads, and in more modern ones they were welded elements integrated into the load-bearing frame.
When inspecting a car, it is important to distinguish between external linings and internal strength elements. The outer part is often made of thinner metal or plastic and is susceptible to paint chipping, while the internal power threshold is in an area of stagnant moisture and dirt. Replacing Nissan Sunny thresholds requires a precise understanding of this structure, since simply screwing a cover onto rotten metal is pointless.
There are several main types of damage characteristic of Nissan Sunny:
- 🔧 Complete end-to-end rotting at the bottom of the threshold, where salt and water accumulate.
- 🔧 Peeling of paint and formation of bubbles under the overlays due to the lack of anticorrosive.
- 🔧 Mechanical deformations after unsuccessful parking or driving along curbs.
Understanding the type of damage determines the repair strategy. If we are talking about surface defects, cleaning and processing will be enough. In case of deep corrosion, it will be necessary to cut out the damaged area and weld in new metal.
Symptoms of corrosion and diagnosis of body condition
Regular inspection Nissan Sunny allows you to identify problems at an early stage. Often, owners notice corrosion too late, when the metal has already begun to crumble. The first warning sign is the appearance of rust at the junction of the threshold and the door, as well as swelling of the paint at the bottom of the sides. If you see these signs, you need to take action immediately.
For deep diagnostics, use a magnet and a thin screwdriver. Run a magnet along everything door sill Nissan Sunny: if it sticks evenly everywhere, the metal is intact, but if there are areas where the magnet falls off or holds weakly, a layer of rust or putty has formed there. Carefully probe the metal with a screwdriver in suspicious places - healthy metal is hard, but rotten metal is dented.
Pay special attention to the drainage holes at the bottom of the thresholds. They often become clogged with dirt and leaves, creating the perfect environment for rotting from the inside. If the water does not leave, it stagnates and corrodes the metal from the inside, which is not visible from the outside. Check their passage before starting any repair work.
⚠️ Caution: Do not attempt to paint over rust. Nissan Sunny without preliminary mechanical cleaning. This will only delay the destruction process, but will not stop it, since corrosion will continue to develop under the paint layer.
If you find that the metal has become soft and friable, you need to carry out restoration of thresholds Nissan Sunny with replacement of fragments. Temporary measures in the form of mastic or spray may hide the defect, but will not save the body from destruction in the future. Timely diagnostics will save you significant money on full repairs.
Choice of materials: factory thresholds or trims?
When the time comes for repairs, the owner Nissan Sunny is faced with a choice: restore original elements, weld in new metal thresholds or install plastic trims. Each option has its pros and cons. Factory sills provide maximum rigidity, but they are difficult to find in good condition, as they are often sold already damaged.
Metal overlays are a compromise solution. They are welded over the old threshold and protect it from new damage. However, this requires high-quality surface preparation and professional welding. If done incorrectly, moisture will get between the trim and the body, which will accelerate rot. Installation of thresholds Nissan Sunny made of metal requires body repair skills.
Plastic linings (thresholds-steps) are popular due to their ease of installation and the absence of the need for welding. They perfectly protect against scratches and dirt, but do not restore the rigidity of the body. For Nissan Sunny this can be an excellent option if the power element inside is still intact, and the outer part has simply become unusable.
- 🛠️ Metal thresholds: durability, restoration of rigidity, complex installation.
- 🛠️ Plastic linings: easy to install, protect from dirt, do not affect rigidity.
- 🛠️ Combined solutions: metal welding followed by installation of a plastic element.
When choosing a material, be guided by the condition of your car. If you plan to use Nissan Sunny for a long time and in difficult conditions, it is better to invest in high-quality metal repairs. For temporary use or if the car is old, plastic pieces may be a decent option.
⚠️ Attention: When choosing metal pads, make sure that they have an anti-corrosion coating. Cheap, thin metal products can rust faster than your old body.
- Cooking new metal
- Installation of plastic covers
- Complete replacement for the original
- Replacement with reinforced ones from another car
Instructions for replacing and repairing thresholds
The process of replacing thresholds with Nissan Sunny - This is a labor-intensive task that requires adherence to technology. Start by removing all of the interior panels to gain access to the inside of the sill. This is necessary for high-quality cleaning and assessment of the extent of damage. Don't skimp on time at this stage, as hidden areas often rot more than outer areas.
If you decide to weld new elements, use spot welding or argon welding to minimize metal distortion. It is important to maintain the geometry of the body, so before welding, secure the sills to the body with clamps. Repair of thresholds Nissan Sunny must be carried out with millimeter precision so that the doors close without gaps.
After welding, be sure to treat all seams with an anti-corrosion compound. Use a rust converter primer before applying paint. The internal cavity of the threshold also needs to be treated, for which use special nozzles for spraying mastic. This will create a protective barrier that prevents moisture from entering.
Here are the main stages of work that need to be completed:
- 🔧 Dismantling the interior and removing old threshold elements.
- 🔧 Cleaning the metal to a shine and degreasing the surface.
- 🔧 Rust converter treatment and priming.
- 🔧 Installation and fixation of new thresholds.
☑️ Preparation for replacing thresholds
If you do not have experience in welding, entrust this work to professionals. Welding errors can lead to disruption of body geometry, which will affect handling and safety. Nissan Sunny. A quality repair is an investment in the longevity of your vehicle.
⚠️ Attention: Do not use an oxygen-acetylene torch to cut thresholds if you can use an angle grinder. High temperatures can damage the structure of the metal and reduce its strength.
What to do if the threshold is rotting from the inside, but everything looks fine on the outside?
If the outside of the threshold is intact, but when you tap you hear a dull sound or the metal is dented, then the corrosion is coming from the inside. In this case, it is necessary to drill holes in the lower part of the threshold, blow it with compressed air, treat the inside with liquid anticorrosive (for example, tar or mastic through a spray gun) and weld the holes. Ignoring this stage will lead to the fact that after a year or two the outer part will also begin to fall off.
Anti-corrosion protection and prevention
After installing new thresholds or repairing old ones, it is necessary to pay attention to their protection. Anti-corrosion treatment for Nissan Sunny - This is a guarantee that the repair will last for many years. Use special mastics that have good adhesion and elasticity so that the coating does not crack during vibration.
It is recommended to treat the internal cavities of the thresholds with liquid materials that can penetrate into the most inaccessible places. There are special guns and extensions for this. Apply the mixture liberally, but make sure it does not drip onto the floor of the cabin. The outer part can be covered with a layer of mastic or special pads can be used for additional protection against gravel.
Wash your car regularly, especially in winter, paying attention to the underbody and sills. Remove salt and reagents, as they are the main enemies of metal. If you notice chipped paint on a threshold, immediately treat it with primer and paint to prevent moisture from entering.
Basic rules of prevention:
- 🛡️ Washing the bottom and thresholds at least once a month during the winter period.
- 🛡️ Timely repair of chips and scratches on the body.
- 🛡️ Checking drainage holes and cleaning them.
- 🛡️ Periodic inspection of the anticorrosive condition.
Before applying mastic, be sure to warm the car surface to a temperature of +15..+20°C. Cold metal does not absorb protective compounds well, and the coating may peel off after a short time.
Comparative characteristics of materials for thresholds
For clarity, let’s compare the main materials used in the repair and protection of thresholds Nissan Sunny. The choice of material depends on your goals: restoring factory specifications or installing additional protection.
| Material | Service life | Difficulty of installation | Effect on stiffness |
|---|---|---|---|
| Galvanized steel | 10+ years | High (welding) | Full recovery |
| Black steel (primed) | 5-7 years | High (welding) | Full recovery |
| Plastic (polypropylene) | 5-8 years | Low (screws) | No |
| Aluminum | 8-12 years | Medium (riveting/welding) | Partial |
Galvanized steel is the preferred replacement material as it offers the greatest resistance to corrosion. However, it is more difficult to find on sale and more difficult to cook. Black steel requires careful anti-corrosion treatment, but is more affordable. Plastic and aluminum are good as protective elements, but do not replace the power frame.
Remember that high-quality repair of Nissan Sunny thresholds is impossible without completely stripping the metal to a clean layer. No modern compounds can stop corrosion if old rotten metal remains underneath. This is a critical condition for the success of the entire work.
Common mistakes when repairing thresholds
Often owners Nissan Sunny make mistakes that ruin all repair efforts. One of the most common is saving on anti-corrosion materials. Cheap mastic can peel off after just a season, exposing the metal. Always use proven brands and quality ingredients.
Another mistake is improper welding. Heating the metal too much can cause it to burn out or become deformed. Loose seams become bridges for moisture, which restarts the corrosion process. If you are not confident in your skills, it is better to turn to specialists.
They also often forget about treating the internal cavity of the threshold. External repairs without internal protection are useless, since moisture will accumulate inside and rot the metal from the inside. Always ensure that the inside of the threshold is also protected.
Avoid using low quality joint sealants. Over time, they dry out and crack, allowing moisture to pass through. Use special automotive sealants that are resistant to temperature changes and ultraviolet radiation. The right approach to repairs guarantees a long service life for your car.
Proper anti-corrosion treatment of the internal cavity of the threshold is more important than beautiful external painting, since it is from the inside that hidden corrosion begins.
Questions and answers (FAQ)
In this section we have collected answers to the most popular questions that owners have. Nissan Sunny when repairing thresholds.
Is it possible to cook thresholds on Nissan Sunny without removing the interior?
No, this is highly not recommended. Removing the interior is necessary for access to the inside of the threshold, high-quality cleaning and anti-corrosive treatment. Without this, the repair will be of poor quality and short-lived.
Which anticorrosive agent is best to use for thresholds?
For the internal cavity, liquid mastics based on bitumen or rubber, which are applied through a sprayer, are best suited. For the external part, you can use thick mastics or special anti-gravel coatings.
How long does it take to replace thresholds?
If you have the equipment and experience, replacing thresholds takes from 1 to 3 days. It depends on the extent of the damage and the need to repair the floor or other body parts.
Is it necessary to do a wheel alignment after replacing the thresholds?
If, when replacing the thresholds, the geometry of the body was not disturbed and the suspension elements were not affected, then a wheel alignment is not necessary. However, checking the wheel alignment does not hurt.
Is it possible to install thresholds from another Nissan model on Sunny?
In some cases, it is possible to install thresholds from models of the same platform (for example, Almera or Tiida), but will require some modification and adjustment. It is better to use original parts or specialized repair pads.