How to change the alternator belt on a Nissan Almera G15 with air conditioning yourself: a complete guide

Why does the alternator belt on the Almera G15 require special attention?

Owners Nissan Almera G15 2013-2018 model years with air conditioning face a unique problem: the standard alternator belt here is integrated into the air conditioning compressor drive system. This means that replacing it requires not only basic skills, but also consideration additional pulley and correct tension. Errors here can result not only in belt whistling, but also in engine overheating or climate system failure.

Official regulations Nissan requires checking the condition of the belt every 30,000 km, and replacement - through 60,000 km or when cracks or delaminations appear. However, in Russian conditions (temperature changes, dust, reagents), the belt life is often reduced to 40–50 thousand km. The main difficulty is access to the tension roller, which is on Almera G15 hidden behind the generator and air conditioning compressor.

This article will help you avoid common mistakes:

• 🔧 Wrong choice of belt (length 6PK1720 for models with air conditioning!)
• 🔧 Over-tightening or under-tightening leading to bearing wear
• 🔧 Damage to the air conditioning compressor pulley during dismantling

What tools and spare parts will be needed?

To replace the alternator belt with Nissan Almera G15 with air conditioning you will need a specialized set of tools. Without it, access to the tension roller will be extremely difficult. Here's the full list:

• 🔨 Socket wrench on 14 mm (for generator bolt)
• 🔨 Head on 10 mm with extension (for compressor bracket)
• 🔨 A special key for the tension roller (or a homemade analogue of two M8 bolts)
• 🔨 Screwdriver with a flat blade (for fixing the roller)
• 🔨 Torque wrench (optional, for precise tightening)

When it comes to spare parts, it is critical to select the correct length of belt. Original article from Nissan — 11920-4M50A (length 1720 mm, 6 streams). Alternative analogues:

Brand	Article	Length	Note
Gates	6PK1720	1720 mm	Best price/quality ratio
Contitech	6PK1720	1720 mm	Softer than original, less noise
Dayco	6PK1715	1715 mm	Suitable for models without air conditioning!

Attention! Belts length 1715 mm (For example, Dayco 6PK1715) are intended for Almera G15 without air conditioning and will not fit your car. Installing them will lead to insufficient tension and slippage.

Preparatory stage: draining freon and removing protection

The main feature of replacing the belt with Almera G15 with air conditioning — the need for partial dismantling of the climate control system. Without this, access to the tension roller is impossible. There are two options:

1. Contact service for draining freon (cost ~1500–2000 ₽). This is the safest method, since independent draining without equipment is prohibited by environmental standards.
2. Do without draining, if the compressor does not require repair. To do this, you need to carefully move it to the side without disconnecting the lines.

We will consider the second option as it saves time and money. Algorithm of actions:

Remove the negative terminal of the battery|Unscrew the engine protection (4 bolts by 10 mm)|Release the mounting of the air conditioning compressor (2 bolts by 12 mm)|Secure the compressor with wire away from the belt-->

⚠️ Attention: If you decide to remove the compressor without draining freon, do not bend the highways and do not pull on the hoses - this may lead to depressurization of the system. Maximum compressor displacement - 5–7 cm.

After removing the engine protection and removing the compressor, access to tension roller (located to the right of the generator) and crankshaft pulley. Clean these elements from dirt with a rag - getting sand or oil on a new belt will shorten its life by 2-3 times.

Step-by-step instructions for replacing the alternator belt

Now let's move on to the main process. Follow the instructions strictly step by step to avoid mistakes:

1. Loosen the tension on the old belt. To do this, insert the key into 14 mm into the tension roller bolt and turn it counterclockwise. The roller is equipped with a spring mechanism, so keep it in a relaxed position.

2. Remove the old belt. Carefully pull it off the pulleys in the following sequence: generator → air conditioning compressor → crankshaft. If the belt is stuck, use a screwdriver as leverage, but do not use excessive force - the plastic pulleys are Almera G15 fragile.

3. Check the condition of the rollers. Turn the tension and idler rollers by hand: they should rotate silently and without backlash. At the slightest hum or jamming, replace them (items: tension - 11920-4M50B, bypass - 11920-4M50C).

4. Install a new belt. Start with the crankshaft pulley, then slide it onto the alternator and compressor pulley. Make sure the belt is in place strictly in the center each pulley - displacement will lead to accelerated wear.

5. Pull the belt. Turn the tension roller clockwise until the marks on it align (the two marks should match). If there are no marks, the tension is considered normal if, when pressed with a finger in the middle, the belt bends by 8–10 mm.

A critical nuance: on an Almera G15 with air conditioning, the belt must be tighter than on models without climate control. Insufficient tension will lead to slipping when the air conditioning is turned on and whistling at high speeds.

What to do if the belt does not tension?

If the tension roller does not lock in the desired position, check the spring inside it - it may have burst. The cause may also be wear on the teeth on the roller (replace it). As a last resort, use a spudger for manual tensioning, but this is a temporary solution.

Checking and adjusting after replacement

Successfully replacing the belt is only half the battle. Now you need to make sure that the system is working correctly. Start the engine and perform the following checks:

• 🔍 Visual inspection: The belt should not “walk” along the pulleys or slide to the side.
• 🔍 Sound test: There should be no whistle or squeak when you press the gas sharply.
• 🔍 Load test: turn the air conditioning on maximum - if the belt slips, additional tension is required.
• 🔍 Charging check: The voltage on the battery when the engine is running should be 13.8–14.5 V.

⚠️ Attention: If after replacing the belt there is constant hum on the generator or compressor side, turn off the engine immediately! This is a sign of belt overtightening, which leads to destruction of the bearings. Loosen the tension 1–2 mm and repeat the test.

For an accurate diagnosis, use bench test:

1. Raise the front right wheel (alternator side).
2. Engage 4th gear and spin the wheel to 3000 rpm (according to the tachometer).
3. Listen to the operation of the belt: extraneous sounds will indicate a malfunction of the rollers or incorrect installation.

Common mistakes and how to avoid them

Even experienced craftsmen make mistakes when replacing the alternator belt with Almera G15. Here are the most common of them and ways to prevent them:

Error	Consequences	How to avoid
Using the belt 1715 mm instead of 1720 mm	Slipping, whistling, insufficient battery charging	Check the article number by VIN or measure the old belt
Belt retightening	Wear of generator and compressor bearings (repair cost ~15,000 ₽)	Control tension by marks or deflection (8–10 mm)
Failure to remove battery terminal	Short circuit when working with a generator	Always turn off the minus before starting work
Ignoring roller status	Accelerated belt wear (lifetime is reduced by 2–3 times)	Rotate the rollers by hand before installing a new belt

Another common problem is air conditioning compressor pulley damage during dismantling. To avoid this, never use metal tools to remove the belt from the pulley. It is better to use a plastic mounting spatula or a wooden stick.

If, after replacement, the belt continues to whistle when the air conditioner is turned on, the reasons may be as follows:

• 🔧 Weak tension — tighten the belt another 1–2 mm.
• 🔧 Oil ingress on the belt - clean the pulleys with alcohol.
• 🔧 Generator pulley wear — check it for runout.

When to contact the service?

Despite its apparent simplicity, some situations require professional intervention. Contact a car service if:

• 🚨 The belt broke in less than 20,000 km after replacement - this indicates a problem with the pulleys or rollers.
• 🚨 You can hear it when the engine is running. metallic clang on the generator side - bearing wear is possible.
• 🚨 After replacing the belt air conditioner doesn't work — damage to the lines or a freon leak could occur.
• 🚨 Marks are visible on the belt or pulleys oil or coolant — diagnostics for system tightness is required.

Average cost of replacing an alternator belt Nissan Almera G15 in the service - 2500–4000 ₽ (excluding spare parts). If rollers or bearings need to be replaced, the price will increase to 6000–8000 ₽. However, replacing it yourself will only cost the cost of the belt (800–1500 ₽) and save time.

⚠️ Attention: If you have never worked with air conditioning systems, do not risk draining freon yourself! Incorrect filling may result in water hammer in the compressor (repairs will cost 20 000–30 000 ₽).

FAQ: Frequently asked questions about replacing the alternator belt

Is it possible to drive with a whistling alternator belt?

Short-term driving is possible, but a whistle indicates belt slippage, which leads to:

• Battery undercharging (risk of being left without starting the engine).
• Overheating of the generator (the diode bridge may fail).
• Accelerated wear of the belt (it may break on the way).

Maximum mileage with whistle - 200–300 km, but it’s better to fix the problem right away.

Which alternator belt is best to choose for Almera G15?

Recommended options in terms of price/quality ratio:

1. Gates 6PK1720 - the optimal choice for most owners.
2. Contitech 6PK1720 - softer and quieter, but 20–30% more expensive.
3. Original Nissan 11920-4M50A - if you want 100% compatibility.

Avoid cheap analogues (for example, Fenox or Finwhale) - they often stretch after 10,000 km.

Do I need to change the rollers when replacing the belt?

It is not necessary to replace the rollers, but check their condition:

• 🔹 Backlash when swaying - replace.
• 🔹 Noise or jamming during rotation - replace.
• 🔹 Cracks on the body - replace.

Cost of new rollers: tension - 1200–1800 ₽, bypass - 800–1200 ₽. Replacing them will extend the life of the belt by 30–50%.

What happens if the alternator belt breaks while on the road?

The consequences depend on driving conditions:

• 🚗 Traffic during the day: you can drive to the service center on the battery (power reserve ~30–50 km with consumers turned off).
• 🚗 Traffic at night: There is a risk of being left without electricity and charging - it is better to call a tow truck.
• 🚗 Air conditioner on: the compressor will be blocked, which may lead to a break in the timing belt (on Almera G15 with engine HR16DE this is not critical, but requires verification).

In any case, stop immediately if you hear a popping noise from under the hood or the battery light comes on!

How often should the alternator belt be checked?

Recommended schedule for Nissan Almera G15:

• 📅 Every 15,000 km: visual inspection for cracks and delaminations.
• 📅 Every 30,000 km: checking the tension and condition of the rollers.
• 📅 Every 60,000 km: scheduled belt replacement (or earlier if defects are detected).

Belt wear is accelerated by: off-road driving, frequent operation of the air conditioner at maximum, contact with oil or antifreeze.