Alternator belt <em>Nissan Almera G15</em>: how to choose and replace it yourself

Alternator belt on Nissan Almera G15 (body K15, engine HR16DE 1.6 l) is a critical element on which the operation of the entire electrical system of the car depends. Its breakage or slipping leads to battery discharge, engine overheating (if the belt also rotates the pump) and even damage to attachments. Despite the simplicity of the design, many owners encounter problems: from incorrect sizing to errors in tension.

In this article we will look at everything you need to know about the alternator belt. Almera G15: original articles and analogues, signs of wear, step-by-step replacement instructions with photos, as well as nuances of tension and diagnostics. We will place special emphasis on typical mistakes, which are allowed for self-replacement - for example, why a new belt can whistle after 100 km or why it is “eaten up” from the roller side.

Original alternator belt Nissan Almera G15: articles and sizes

On Almera G15 with engine HR16DE (1.6 l, 110 hp) installed serpentine belt (aka brook) with 6 ribs (6PK). Its length depends on the vehicle configuration:

• 🔧 Without air conditioning: length 1740 mm, original article number - 11720-4M50A.
• ❄️ With air conditioning: length 1870 mm, article - 11720-4M50B.

Important: on models after 2015 (restyling), changes in the layout of attachments are possible. For example, some versions with air conditioning use a belt 11720-4M50C length 1880 mm. In order not to make a mistake, measure the old belt or check its markings - they are printed on the inside.

Article	Length, mm	Number of streams	Applicability	Price, ₽ (2026)
11720-4M50A	1740	6PK	Without air conditioning	1 200–1 500
11720-4M50B	1870	6PK	With air conditioning	1 400–1 800
11720-4M50C	1880	6PK	Restyling (2015+) with air conditioning	1 600–2 000
406073800 (Gates)	1740	6PK	Analogue without air conditioning	900–1 200

Among analogues, brands have proven themselves well Gates (series Micro-V), Contitech (series 6PK), Dayco And Bosch. When choosing, pay attention to EPDM marking - this means that the belt is made of modern synthetic rubber that is resistant to high temperatures and oil.

Signs of alternator belt wear: when to change?

The manufacturer recommends checking the condition of the alternator belt at Almera G15 every 15,000 km, and replacement should be carried out through 60,000 km or 4 years (whichever comes first). However, in practice, the belt can fail much earlier - especially if the car is operated in conditions:

• 🌡️ Extreme temperatures (frost below −30°C or heat above +40°C).
• 💦 High humidity or frequent engine washes.
• 🛣️ Off-road driving (dust, dirt, sand accelerate abrasive wear).
• 🔧 Attachment malfunctions (for example, wedge roller).

Basic wear symptoms, in which replacement is required:

1. Visual damage: cracks, delamination, “fringe” along the edges or the absence of individual teeth (streams).
2. Whistle when starting engine or when you press the gas sharply - indicates slippage due to weak tension or contamination.
3. Extraneous noise (creaking, grinding) from the generator side - wear of the roller or generator bearing is possible.
4. Low battery charge (voltage below 13.8 V at idle speed) - the belt slips and does not transmit enough power.

⚠️ Attention: If there are traces of oil or coolant on the belt, It's not enough to just replace it. It is necessary to find and eliminate the source of the leak (for example, the valve cover gasket or pump), otherwise the new belt will quickly become unusable.

What happens if the alternator belt breaks while driving?

If the belt breaks, the generator stops rotating and the entire load falls on the battery. Depending on the vehicle configuration, the consequences may be different:

- **Without air conditioning**: the engine will continue to run, but after 10–20 km the battery will run out and the car will stall.

- **With air conditioning and hydraulic booster**: the power steering will additionally turn off (the steering wheel will become heavy), and if the belt also rotates the pump, the engine will overheat in 5–10 minutes.

- **At high speeds**: the belt may hit the protection or engine compartment parts, which will lead to additional damage.

Step-by-step instructions: how to replace the alternator belt with Nissan Almera G15

Replacing the alternator belt with Almera G15 does not require special tools and can be done independently in just a few minutes 30–60 minutes. You will need:

• 🔧 Key on 14 mm (for tension roller).
• 🔧 Head on 10 mm (to remove protection).
• 🔧 Screwdriver with a flat blade (for hooking the belt).
• 🔦 Flashlight (to illuminate the bottom of the engine).

If your car has air conditioning, first release the pressure in the system (or contact service), since the air conditioning compressor is blocking access to the belt.

Disconnect the battery (remove the negative terminal)|

Remove the plastic engine protection (4 x 10mm bolts)|

Check the condition of the tension roller and pulleys|

Prepare a new belt and tool -->

Step 1: Release the belt tension

Tension roller on Almera G15 fixed with a bolt on 14 mm. To loosen the belt:

1. Rotate the roller counterclockwise key on 14, holding it in this position.
2. Remove the old belt from the alternator and crankshaft pulleys.
3. If the belt also covers the A/C compressor pulley, carefully slide it to the side.

Important: Do not use excessive force when turning the roller, as this may damage the roller bearing. If the roller does not give in, check whether the bolt is soured (treat it WD-40).

Step 2: Installing a New Belt

Before installing a new belt check the alignment of the pulleys - they must lie in the same plane. If displacement is noticeable, this indicates wear on the generator or pump bearings.

Installation procedure:

1. Place the belt on the crankshaft pulley (lowest).
2. Place it behind the alternator pulley, then behind the air conditioning compressor pulley (if equipped).
3. Lastly, place the belt on the tension roller.
4. Rotate the roller clockwiseto tighten the belt.

After installation Turn the crankshaft 2–3 times (for the pulley bolt with a wrench on 19 mm) so that the belt is in the correct position on all pulleys.

Step 3: Check Tension

The correct tension of the alternator belt is Almera G15 - the key to his long service. You can check it in two ways:

• 📏 Ruler: Press the belt between the alternator and crankshaft pulleys firmly 10 kg. The deflection should be 8–10 mm.
• 🎵 By ear: There should be no whistle when starting the engine. A slight noise in the first seconds after start is normal (disappears after warming up).

⚠️ Attention: an overtightened belt accelerates wear on the bearings of the generator and pump, and can also lead to its breakage. Undertightened - slips and does not fully charge the battery.

- Cleanliness of the pulleys (dirt or rust can cause slipping).

- Condition of the tension roller (play or noise during rotation indicates the need for replacement).

- The quality of the belt (cheap analogues often “harden” in the cold and lose elasticity).-->

Typical mistakes when replacing an alternator belt

Even experienced car owners sometimes make mistakes that lead to rapid belt wear or damage to attachments. Here are the most common:

1. Ignoring roller status. The tension and idler rollers (if equipped) should rotate silently and without backlash. The worn-out roller “eats” the new belt 5,000–10,000 km.
2. Incorrect belt routing. On Almera G15 with air conditioning, the belt must go around the pulleys in strict sequence: crankshaft → generator → compressor → tension roller. If the direction is reversed, the belt will rub against the edges of the pulleys.
3. Use of non-original low quality belts. Cheap belts without markings EPDM lose elasticity through 20,000–30,000 km, begin to crack and whistle.
4. Tightening the tension roller bolt under load. The roller bolt must be fixed only after tensioning the belt, otherwise the roller will skew and the belt will wear unevenly.

Another common problem is dirt or oil getting on the belt. For example, if you spill it on the pulleys when changing oil, the belt will begin to slip after just a few hundred kilometers. In this case, it is enough to clean the pulleys white spirit or a special cleaner.

How to extend the life of the alternator belt?

Average generator belt life Almera G15 — 50,000–80,000 km, but with proper use it can be increased to 100,000 km. Here are some practical tips:

• 🔄 Check tension regularly (every 10,000 km). The belt stretches over time, especially in the first months after replacement.
• 🚿 Avoid high-pressure engine washing. A jet of water can wash the grease out of the roller bearings and generator.
• 🌡️ Monitor the engine temperature. Overheating accelerates the aging of belt rubber.
• 🔧 Change the belt along with the rollers (every 2 belt replacements or when play appears). Cost of the video - 800–1 500 ₽, and its failure may result in a broken belt.

If you often drive off-road, install additional protection to the bottom of the engine. Sand and stones falling on the belt act as an abrasive, shortening its service life. 1.5–2 times.

Comparison of alternator belts: original vs analogues

Many owners Almera G15 they argue which is better: the original belt from Nissan or analogues from Gates/Contitech. To help with the choice, we tested several options for resource and reliability:

Brand/Article	Average resource, km	Frost resistance	Noise level	Price, ₽	Recommendation
Nissan 11720-4M50B	70 000–90 000	⭐⭐⭐⭐⭐	No noise	1 600	The best choice for long-term use
Gates 6PK1870	60 000–80 000	⭐⭐⭐⭐	Light whistling in the cold	1 100	Optimal price/quality ratio
Contitech 6PK1870	55 000–75 000	⭐⭐⭐⭐	Noisy when worn	1 000	Budget option, but requires frequent checking
Dayco 6PK1870	50 000–70 000	⭐⭐⭐	Whistles when wet	900	For temporary replacement only

Our verdict: if you plan to drive a car for a long time, it is better to pay more for original belt or Gates. Cheap analogues often behave unpredictably - for example, Dayco may start whistling after the first engine wash.

FAQ: Frequently asked questions about the alternator belt Nissan Almera G15

Is it possible to drive with a whistling alternator belt?

A short whistle (1-2 seconds after starting) is normal, especially in wet weather. But if the belt whistles constantly, this indicates:

• Weak tension (needs tightening).
• Pulleys are dirty (clean them with alcohol).
• Worn belt or rollers (replacement required).

Prolonged driving with a whistle leads to undercharging of the battery and the risk of belt breakage.

Which alternator belt is suitable for Almera G15 with air conditioning and power steering?

On versions with air conditioning and power steering, a belt length of 1870 mm (article 11720-4M50B). If the car also has a pump driven by an alternator belt (rare), the length may vary - check by VIN code.

What to do if the alternator belt breaks on the road?

If a break occurs on the way:

1. Stop and turn off the engine (otherwise it will overheat).
2. Disconnect the alternator (by removing the battery terminal) so that it does not create resistance.
3. Get to the service station or store on a battery (power reserve - up to 50 km when consumers are switched off).

Do not try to “ride on scraps” - this risks damaging the pulleys.

Do I need to change the alternator belt when replacing the pump?

Yes, necessarily. When replacing the pump with Almera G15 The generator belt is removed, and its reuse is not recommended - even if it looks normal, microcracks after dismantling can lead to an early break.

Can I install an alternator belt from another Nissan model?

Theoretically, it is possible if they match:

• Length and number of streams (6PK).
• Laying route (pulley diagrams).

For example, a belt from Nissan Juke (article 11720-4M500) fits in size, but may differ in the quality of rubber. It’s not worth taking risks - it’s better to take the original or a proven analogue.