Thresholds Nissan Almera (especially for models G15 And N16) is one of the most vulnerable parts of the body. Corrosion, mechanical damage from curbs or gravel, as well as factory flaws in anti-corrosion treatment lead to the fact that after 3-5 years of operation the metal begins to rust from the inside. In this article, we will look at how to diagnose the problem, what repair methods exist (from local welding to complete replacement), and also how much it will cost in 2026.

It is important to understand: ignoring rust on thresholds is fraught with more than just aesthetic problems. Rotten metal reduces the rigidity of the body, which affects safety in an accident. Besides, on the Almera N16, the thresholds often rot along with the side members - their repair will cost 2-3 times more than timely treatment at an early stage. We have collected proven recovery methods that are suitable for both garage repairs and service calls.

Reasons for the destruction of thresholds on Nissan Almera: why even new cars rot

The main cause of threshold corrosion is poor quality galvanization and weak factory anti-corrosion treatment. On Almera G15 (2012–2018) and N16 (2000–2006), the manufacturer skimped on protecting the lower part of the body, which leads to moisture accumulation inside the cavities. Even small chips of paint from road gravel become pockets of rust.

Other common reasons:

  • 🚗 Mechanical damage: hitting curbs, parking “blind” in winter, when thresholds rub against snow accumulations.
  • 🌧️ Aggressive reagents: salt and chemicals on the roads in winter corrode paintwork and metal 3-4 times faster.
  • 🔧 Improper repair: after an accident, sills are often cooked “in a hurry” without completely cleaning the rust, which accelerates corrosion.
  • 🔥 Temperature changes: Condensation inside the threshold freezes in winter, expands and destroys the metal from the inside.

On Almera Classic (N16) The problem is aggravated by the fact that the drainage holes in the thresholds are often clogged with dirt. Water accumulates inside, and after 2-3 years the metal will rust through. You can check this by tapping the threshold with a wooden stick: a dull sound indicates internal corrosion.

📊 How often do you treat thresholds with anticorrosive?
  • Once a year
  • Every 2–3 years
  • Just before winter
  • Never

Diagnostics of the condition of thresholds: when welding is needed, and when putty is enough

Before starting repairs, you need to assess the extent of the damage. Let's divide the problems into 3 categories:

Damage level Signs Recommended Repairs Cost (RUB)
Light (surface rust) Small saffron marks, paint chips, no through holes Cleaning, priming, painting 1 500–3 000
Medium (local corrosion) Rust has eaten through the metal by 1–2 mm, there are small holes Rust cutting, patching, welding 5 000–12 000
Severe (through corrosion) Holes from 5 cm in size, the threshold “breathes” when pressed Threshold replacement (partial or complete) 15 000–30 000
Critical (rotting with spar) Rust has spread to the amplifiers, side members, and interior floor Major repairs with interior disassembly 30 000–70 000+

For an accurate diagnosis you will need:

  • 🔦 Flashlight and mirror - to inspect the inside of the threshold through the technological holes.
  • 🔨 Screwdriver or awl - pierce suspicious places: if the tool fails, the metal has rotted.
  • 📏 Ruler - measure the depth of the rust (if it is more than 1 mm, putty will not help).
⚠️ Attention: On Almera G15 Often not only the external thresholds rust, but also internal amplifiers (they are not visible from the outside!). If you hear a crunch when you press the threshold, this is a sign of destruction of the amplifier. In this case, a complete replacement of the element will be required.

Self-repair of thresholds: step-by-step instructions with photos

If the damage is light or moderate, you can do the repair yourself. Let's look at the process using an example Nissan Almera G15 with local rust on the threshold.

1. Preparation and cleaning

First you need to remove the paintwork and rust:

  • 🧽 Clean the threshold from dirt using automatic washing chemicals (for example, Karcher).
  • 🖌️Apply rust converter (For example, Tsinkar) for 20–30 minutes, then rinse.
  • 🔧 Clean the metal to a shine with a grinder with a petal wheel or a drill with a brush attachment.

2. Cutting out rust and welding patches

If rust has eaten through the metal:

  1. Cut out the rusted area with a grinder, retreating 1-2 cm from the edge of the corrosion.
  2. From sheet metal 0.8–1 mm thick, cut a patch to the shape of the cutout.
  3. Weld the patch semi-automatic (0.8 mm wire, CO₂ gas). Clean and treat seams zinc spray.

Make sure the battery is disconnected (to avoid short circuit)

Protect glass and plastic from sparks (cover with asbestos cloth)

Check the tightness of gas hoses

Have a fire extinguisher ready (just in case) -->

3. Putty and painting

After welding:

  • 🎨 Apply 2-3 layers epoxy putty (For example, Novol), drying each layer.
  • 🖌️ Sand the surface with sandpaper P120 → P240 → P400.
  • 🔴 Cover with primer (better acidic for better adhesion), then paint in body color.

To protect against future corrosion, treat the inside of the threshold anticorrosive ML (For example, Dinitrol ML) through technological holes. On Almera N16 These holes are located under plastic plugs - they need to be removed with a screwdriver.

💡

Before painting, warm up the threshold with a hair dryer - this will remove moisture from the metal and improve paint adhesion.

Replacing a threshold on a Nissan Almera: when welding is indispensable

If the threshold has rotted by more than 30% or the rust has spread to the spar, a complete replacement is required. On Almera G15 And N16 The process is similar, but there are nuances:

Sequence of work:

  1. Remove the door (unscrew the hinges and disconnect the wiring).
  2. Cut out the old threshold with a grinder, retreating 5–7 cm from the welding points to the body.
  3. Fit a new threshold (original or analogue from Febi, Mapco) in place, secure with clamps.
  4. Weld by spot welding or semi-automatic, then clean the seams.
  5. Treat with anticorrosive and paint.

Cost of the new threshold:

  • 🔧 Original (Nissan) - 8,000–12,000 rubles. (left/right).
  • 🔧 Analogue (Febi, Mapco) — 3,500–6,000 rub.
  • 🔧 Used from disassembly - 1,500–4,000 rubles. (risk of hidden corrosion!).
⚠️ Attention: On Almera N16 when replacing a threshold, you often have to cut a part salon floor, as rust spreads to the amplifiers. If you ignore this, the new threshold will quickly rot again.
How to check the quality of welding after replacing the threshold?

After painting, tap the threshold with a wooden hammer - a dull sound indicates poor welding or rust residues inside. Also inspect the seams from the inside: they should be solid, without cracks or lack of penetration. If welding is performed in spots, the distance between them should not exceed 3–4 cm.

Anti-corrosion treatment of thresholds: how to protect metal for a long time

Even after repair, thresholds must be protected from moisture. Effective methods:

1. Treatment of internal cavities

  • 🛢️ ML-anticorrosive (For example, Dinitrol ML, Tectyl ML) - applied through drainage holes with a pressure gun. They create an elastic film that does not crack during vibration.
  • 🧴 Paraffin compounds (For example, Noxudol 700) - cheaper, but less durable (lasts for 1–2 years).

2. Protection from outside

  • 🖌️ Liquid locker (For example, Body 930) - applied with a brush to the lower part of the threshold. Protects against chips and chemicals.
  • 🛡️ Anti-gravel film - glued to the most vulnerable areas (for example, 3M Scotchgard).

3. Additional measures

  • 🔧 Clean regularly drainage holes in rapids (once every six months).
  • 🚿 After washing, blow the thresholds with compressed air to remove moisture.
  • 🌡️ In winter, avoid parking on wet snow - when it melts, it penetrates the cracks and accelerates corrosion.
💡

Anti-corrosion treatment of thresholds on Nissan Almera must be repeated every 2-3 years, even if everything looks normal on the outside. Internal corrosion can develop unnoticed!

The cost of repairing thresholds in services: comparison of prices in Russia

Prices for repairing thresholds depend on the region, the degree of damage and the type of service (official dealer, private workshop, garage). Average prices in 2026:

Type of work Cost (RUB) Lead time
Local rust removal + painting 3 000–6 000 1 day
Welding patches (1–2 pcs.) 8 000–15 000 2–3 days
Replacing the threshold (one, without spar) 15 000–25 000 3–5 days
Major repairs (threshold + spar) 30 000–60 000+ 5–10 days
Anti-corrosion treatment (ML + external protection) 4 000–10 000 1 day

Tips for choosing a service:

  • 🔍 Look for workshops with guarantee for welding work (minimum 1 year).
  • 📸 Ask for a photo before and after repairs - this will help assess the quality.
  • 💰 Compare prices: if the cost of replacing a threshold is below 10,000 rubles, most likely they use used spare parts or save on anticorrosion.

At official dealerships Nissan repairs will cost 30–50% more, but they provide a guarantee and use original spare parts. For example, replacing the threshold with Almera G15 at the dealership it will cost 25,000–40,000 rubles. (with work and painting).

Common mistakes when repairing thresholds and how to avoid them

Many car owners are faced with the fact that after repairs, rust returns within a year. Main reasons:

1. Incomplete removal of rust

  • ❌ Error: Only the top layer was cleaned, leaving corrosion inside the metal.
  • ✅ Solution: Use sandblaster or acid etching to completely remove rust.

2. Saving on anticorrosion

  • ❌ Error: They treated only the outside, ignoring the internal cavities.
  • ✅ Solution: Shed the threshold ML-anticorrosive through all technological openings.

3. Incorrect welding

  • ❌ Error: We used electrodes instead of a semi-automatic machine - the seams turned out to be porous.
  • ✅ Solution: Cook semi-automatic in CO₂ environment with wire 0.8 mm.

4. Painting without primer

  • ❌ Error: Apply paint directly to metal or putty.
  • ✅ Solution: Use acid soil for better adhesion.
⚠️ Attention: On Nissan Almera N16 often forgotten to process places where the threshold is attached to the spar. If there is any rust left there, it will quickly spread to the new metal. Before installing the threshold, these areas must be cleaned and coated. zinc spray.

FAQ: Answers to frequently asked questions about repairing Nissan Almera thresholds

Is it possible to drive if the threshold is rusted through?

Technically possible, but unsafe. A rotten threshold reduces the rigidity of the body, which can lead to deformation of the interior in an accident. In addition, rust will quickly spread to the side members and floor, which will significantly increase the cost of repairs. If the hole is small (up to 5 cm), temporarily seal it anti-corrosion tape (For example, 3M Scotch Weld) and contact service as soon as possible.

How long does the threshold last after repair?

The period depends on the quality of work and care:

  • After local repairs (patches + painting) - 2–4 years.
  • After complete replacement with anticorrosive - 5–7 years or more.
  • If you do not treat the thresholds with anticorrosive, the rust will return in 1–2 years.

On Almera G15 with factory galvanization the repair lasts longer than with N16, where the metal is thinner and less protected.

Is it possible to restore the threshold without welding?

Yes, but only if there is corrosion superficial (no through holes). Methods:

  • 🔧 Fiberglass putty (For example, Novol Fiber) - for holes up to 2 cm.
  • 🧲 Epoxy resin with reinforcing mesh - to strengthen thin metal.
  • 🖌️ Liquid rubber (For example, Plasti Dip) - temporary protection against chipping.

However, such methods not durable - after 1-2 years, rust will appear again. For reliable repairs, welding is required.

Which anticorrosive agent is best for Almera thresholds?

Recommended compositions:

  • 🛡️ For internal cavities: Dinitrol ML, Tectyl ML 415 (contain wax and corrosion inhibitors).
  • 🎨 For external processing: Body 930 (liquid locker), Noxudol 700 (paraffin).
  • 🔧 For welds: Zinc spray (For example, Zinc Rich Primer).

On Almera N16 better use ML anticorrosives with high fluidity, since the cavities of the thresholds are narrow and complex in shape.

Where to buy thresholds for Nissan Almera inexpensively?

Purchase options:

  • 🔧 Official dealers — original spare parts, but expensive (RUB 8,000–12,000).
  • 🔧 Online stores (For example, Exist.ru, Autodoc) - analogues from Febi, Mapco (RUB 3,500–6,000).
  • 🔧 Showdown - used thresholds from 1,500 rubles, but there is a high risk of hidden corrosion.
  • 🔧 Avito/Yula — you can find new non-original thresholds from 2,500 rubles.

When buying a used threshold, be sure to check it from the inside — rust is often hidden under a layer of putty.