Alternator belt Nissan Sunny - a small but critical detail on which the operation of the entire electrical system of the car depends. When it wears out or breaks, the battery stops charging, and the engine can stall at the most inopportune moment. However, many owners Sunny (especially models N16 And N17) encounter problems: either the belt whistles during a cold start, or slips at high speeds, or even cracks after 30-40 thousand km.
In this article we will look at how determine alternator belt wear based on indirect evidence, which original and similar parts are suitable for different generations Sunny, and also give step-by-step replacement instructions with photos and videos. We will pay special attention to typical mistakes that beginners make - for example, incorrect tension or ignoring the rollers. If you plan to change the belt yourself, here you will find everything to do it without consequences for the generator and air conditioner (if it is included).
Signs of alternator belt wear: when is it time to change
Alternator belt on Nissan Sunny does not have strict replacement regulations - it all depends on the operating conditions. However there is 5 Key Symptoms, which indicate the need for inspection or replacement:
- 🔊 Whistle when starting engine - especially in damp weather or when the air conditioner is turned on. The sound may disappear after warming up, but this is already an alarming sign.
- ⚡ Battery light flashing on the dashboard. If it lights up at idle, this indicates belt slippage.
- 🔧 Cracks or delaminations on the surface of the belt. It is enough to visually inspect it with the engine off.
- 📉 Voltage drop in the on-board network (below 13.5 V when the engine is running). Check with a multimeter at the battery terminals.
- 🚗 Vibrations or jerking during engine operation, associated with unstable operation of the generator.
On Nissan Sunny N16 (2000–2006) the belt often fails after 40–50 thousand km, especially if the car is operated in an urban cycle with frequent traffic jams. Models N17 (2006–2012) the resource can be longer - up to 60–70 thousand km, but only if it is a high-quality analogue and has the correct tension.
⚠️ Attention: If the belt breaks on the way, do not try to get to the service station on one battery - the generator does not work, and the battery will be discharged in 10–15 km. It is better to call a tow truck or replace the belt on site (if you have a spare one).
- Every 10 thousand km
- Only when the whistle appears
- When changing the oil
- Never checked
Original articles and analogues: what to choose for Nissan Sunny
For Nissan Sunny Several types of alternator belts are suitable depending on the year of manufacture and configuration. Below is a table with original articles and proven analogues:
| Model and year | Original article | Length (mm) | Recommended analogues |
|---|---|---|---|
| Sunny N16 (2000–2006, 1.5/1.6/1.8) | 11720-4M000 |
915 | Gates 5PK915, Contitech 5PK915, Dayco 5PK915 |
| Sunny N17 (2006–2012, 1.5/1.6) | 11720-4M010 |
935 | Gates 5PK935, Bosch 1 987 949 673, Mitsuboshi 5PK935 |
| Sunny with air conditioning (all generations) | 11720-4M025 |
1085 | Contitech 6PK1085, Dayco 6PK1085, Optibelt 6PK1085 |
When choosing an analogue, pay attention to number of streams (5PK or 6PK) and exact length. For example, a belt 5PK915 suitable for Sunny N16 no air conditioning and 6PK1085 - for versions with climate system. Also check the markings on the old belt - they should match the new part.
Among the brands, the best reviews are from Gates And Contitech - They are durable and have minimal stretching. Budget options (for example, Dayco or Bosch) may last less, but are suitable for temporary replacement.
If you are buying a belt for Sunny with air conditioning, take a kit with a tension roller (article no. 11920-4M000). Its resource often coincides with the life of the belt, and replacing the roller separately will be more difficult.
Step-by-step instructions for replacing the alternator belt
Replacing the alternator belt with Nissan Sunny does not require special tools, but will require care. The work will take about 1–1.5 hours. Here's what you'll need:
- 🔧 Set of open-end wrenches (10, 12, 14 mm).
- 🔨 A 14 mm socket wrench or socket for the generator bolt.
- 📏 Ruler or torque wrench (to check tension).
- 🔦 Flashlight (to illuminate the bottom of the engine).
If you have a model with air conditioning, additionally prepare a wrench for the tension roller (usually 14 or 17 mm).
Remove the negative terminal from the battery|Loosen the generator mounting bolt (lower)|Loosen the tension bolt of the generator|Remove the old belt, remembering the installation diagram-->
Step 1: Free access to the belt. Open the hood, remove the negative terminal from the battery. If the air filter is in the way, remove its housing (unscrew 2-3 10 mm bolts).
Step 2: Release the belt tension. On models without air conditioning, the tension is adjusted with a bolt on the generator:
- Loosen the upper generator mounting bolt (12 mm wrench).
- Loosen the bottom bolt (14mm wrench).
- Slide the alternator towards the cylinder block to allow the belt to slack.
On versions with air conditioning, the tension is adjusted with a roller - turn it counterclockwise (use a 14 mm wrench).
Step 3: Remove the old belt. Carefully slide it off the alternator, crankshaft and pump pulleys. If the belt is stuck, do not pull by force - check to see if it is caught on the protection or wires.
Step 4: Install the new belt. Start with the crankshaft pulley, then slide it onto the alternator and pump pulley. For models with air conditioning, first install the belt on the compressor pulley, then on the others.
Step 5: Tension the belt. For Sunny N16/N17 without air conditioning:
- Move the generator away from the cylinder block (use a pry bar or crowbar).
- Tighten the lower bolt of the generator (torque 40–50 Nm).
- Check the tension: the belt should bend by 5–7 mm when you press your finger between the generator and crankshaft pulleys.
For versions with air conditioning, the tension is adjusted with a roller - tighten it so that the belt does not sag, but is not overtightened.
⚠️ Attention: A belt that is too tight will accelerate the wear of the generator and pump bearings, while a loose belt will slip and whistle. After replacement, start the engine and check the operation of the generator (the battery voltage should be 13.8–14.4 V).
On models Sunny N17 with air conditioning, the belt is longer and has 6 grooves (6PK). Do not confuse it with the 5-way option for versions without climate control!
Typical mistakes when replacing an alternator belt
Even experienced car owners sometimes make mistakes that lead to rapid belt wear or alternator failure. Here are the most common:
- 🔧 Incorrect tension - too weak or strong. The first leads to slipping and whistling, the second leads to destruction of the bearings.
- 🔄 Twisting the belt during installation. The belt should lie flat on the pulleys, without kinks.
- 🛠️ Ignoring cutscenes. The tension and idler rollers (if any) also wear out. It is recommended to change them together with the belt.
- 🔋 Forget to check the generator after replacement. If the belt is new, but the battery does not charge, the problem may be in the brushes or diode bridge.
Another common mistake is using a belt of the wrong length. For example, if you put 5PK915 instead of 5PK935, it will be too tight, which will lead to premature wear. Always check the article numbers in the table above!
On Sunny N16 with engine QG16DE (1.6 l) sometimes a problem occurs: the belt rubs against the engine protection. In this case, you need to either bend the protection or replace it with an analogue with a different fastening.
What to do if the belt whistles after replacement?
If the new belt whistles, the reasons may be as follows:
1. Weak tension - tighten the belt.
2. If oil or coolant gets on the pulleys, clean them with alcohol.
3. Wear of pulleys (especially the generator) - check them for runout.
4. Poor quality of the belt - replace it with an original or a proven analogue (Gates/Contitech).
How to extend the life of the alternator belt
Alternator belt on Nissan Sunny It will last longer if you follow a few simple rules:
- 🔧 Check tension regularly - every 10 thousand km. Even a high-quality belt stretches over time.
- 🚿 Avoid contact with liquids on the belt and pulleys. Oil, antifreeze or even water will shorten its life.
- 📅 Change the belt completely - along with the rollers (if any) and checking the generator bearings.
- 🌡️ Monitor the engine temperature. Overheating accelerates the destruction of belt rubber.
If you often drive off-road or in high humidity conditions, you should check the belt more often - every 5 thousand km. Also pay attention to condition of pulleys: If they are scored or worn out, the new belt will wear out quickly.
On Sunny N17 with air conditioning it is especially important to monitor pulley alignment. If the air conditioning compressor or generator is installed skewed, the belt will wear unevenly and may break after 10–15 thousand km.
After replacing the alternator belt, avoid high loads on the engine for the first 100 km (for example, towing or sudden acceleration). This will help the belt “grind” to the pulleys.
Replacement cost: do it yourself or go to a service station?
Alternator belt replacement cost Nissan Sunny depends on several factors:
| Service/Part | Cost (RUB) | Notes |
|---|---|---|
| Alternator belt (original) | 1 200–1 800 | Price per 11720-4M000 or 11720-4M010 |
| Alternator belt (analog) | 600–1 200 | Gates/Contitech for versions without air conditioning |
| Set (belt + roller) | 1 800–2 500 | For models with air conditioning |
| Replacement at service station | 800–1 500 | Excluding cost of parts |
If you decide to change the belt yourself, your costs will be limited to purchasing parts. At the service station you will also have to pay for the work, but you will receive a guarantee (usually 1-3 months). The choice depends on your experience: if you have never dealt with tension rollers, it is better to trust the professionals.
Please note: some service stations may offer a “universal” belt instead of the original one. Refuse - such belts rarely last more than 20 thousand km and often whistle.
FAQ: Frequently asked questions about the alternator belt Nissan Sunny
Is it possible to drive if the alternator belt is broken?
No, it's dangerous. Without a belt, the alternator will not work and the battery will quickly drain. In addition, on many Sunny the belt also drives the pump - engine overheating is inevitable. The maximum that can be done is to drive 2-3 km by tow truck or tow truck.
Which alternator belt is suitable for Sunny N16 with air conditioning?
Versions with air conditioning require a belt 6PK1085 (original 11720-4M025). Analogues: Contitech 6PK1085 or Gates 6PK1085. Pay attention to the number of streams - there should be 6, not 5!
The alternator belt whistles when cold - what to do?
The reasons may be different:
- Weak tension - tighten the belt.
- If moisture gets in, dry the belt and pulleys (you can blow them with air).
- Worn belt or pulleys - replacement required.
- Poor quality belt - replace it with an original or a proven analogue.
If the whistle does not go away after warming up, the problem is more serious - the generator bearing may be worn out.
Do I need to change the rollers when replacing the belt?
Yes, especially if the car's mileage is more than 80–100 thousand km. The tension and idler rollers wear out along with the belt, and their jamming can lead to breakage of the new belt. The cost of the roller is about 500–800 rubles, which is not commensurate with the risk of repeated replacement.
What voltage should be on the battery after replacing the belt?
With the engine running (speed 1,500–2,000 rpm), the voltage at the battery terminals should be 13.8–14.4 V. If it is below 13.5 V, the generator is not charging the battery - check the belt tension or the condition of the generator brushes.