Removal generator by car Nissan Almera N16 - This is a classic procedure that owners face when brushes, diode bridge or bearings fail. Often the problem manifests itself in the form of an extinguished battery charge light or a characteristic whistle from the engine compartment. Ignoring signs of malfunction can lead to a complete discharge of the battery and stopping the engine at the most inopportune moment.
The dismantling process does not require highly complex equipment, but requires free space and basic skills in working with keys. On models with 1.5 and 1.8 liter petrol engines, access to the unit has its own characteristics that affect the time required to complete the work.
Preparing the workplace and necessary tools
Before you begin disassembly, you need to make sure that the car is standing on a level surface with the handbrake on. Be sure to install stops under the rear wheels to eliminate the risk of the machine rolling away while working in the engine compartment or under the bottom.
You will need a standard set of wrenches, including 10, 12, 14 and 17 millimeter sockets. Pay special attention to the extensions and universal joint, as the mounting bolts are often located in hard-to-reach places. To unscrew the tension roller, you will need a ratchet wrench or a special wrench, if the design allows it.
- 🔧 Socket set and ratchet with extension
- 🔧 Phillips and flat blade screwdrivers
- 🔧 Jack and safety stand (for access from below)
- 🔧 Copper grease or WD-40 for treating acidified bolts
Disabling the electrical system and removing the belt
The first critical step is to disconnect the battery. Remove the negative terminal to prevent a short circuit if the wires are accidentally touched with a tool. This action will protect the electronic control unit and the generator itself from power surges.
After de-energizing, it is necessary to loosen the auxiliary drive belt. On Nissan Almera N16 the tension is adjusted by moving the generator itself or using a tension roller, depending on the engine modification. By loosening the fastening nut, you can remove the belt by hand.
⚠️ Warning: Do not attempt to dismantle the alternator without removing the belt. The belt tension is so high that attempting to remove the unit without first loosening it will result in deformation of the housing or breakage of the bracket.
If the belt appears worn, cracked, or has traces of oil, it is highly recommended to replace it with a new one when installing the generator. An old belt can slip even on new equipment, causing overheating and lack of charging.
☑️ Preparing to remove the generator
Disconnecting electrical connectors and power wires
Now that the belt has been removed, you can proceed to disconnecting the electrical part. At the back of the generator there is a massive power bolt, which is connected to a thick wire from the battery. It needs to be unscrewed with a head of 12 or 13 millimeters and carefully moved to the side.
Next to the power bolt there is a plastic connector with a protective cap. Remove the cap, press the latch and pull out the chip. Be careful not to break the plastic latches, which become brittle over time due to temperature changes.
- 💡 Unscrew the power terminal nut (usually 12)
- 💡 Remove the protective cap from the connector
- 💡 Disconnect the “chip” connector from the generator housing
If your vehicle has air conditioning, be aware of any additional wires or tubes that may prevent the unit from being removed freely. In some cases, partial dismantling of the air conditioner pipes is required, but more often it is enough to simply move them to the side without disturbing the tightness of the circuit.
⚠️ Attention: Before unscrewing the power bolt, make sure that the battery terminal is actually removed. Even with the ignition off, there is a constant voltage of 12 volts on this wire.
What to do if the wire is stuck to the terminal?
If the nut does not come off, use a penetrating lubricant and give it time to work. Do not use excessive force to avoid stripping the threads on the generator housing. You can carefully heat the nut with a soldering iron, but without fanaticism, so as not to melt the plastic insulation of the wire.
The process of dismantling the generator mounts
The generator is attached to the engine and bracket with two main bolts. One bolt passes through the bracket from below, the second is attached from above through an eye. Bottom mounts often require the vehicle to be jacked up or placed on a pit for easy access.
The upper mounting bolt may be hidden behind other elements of the engine compartment, for example, behind the air filter housing or pipes. In such cases, it will be necessary to temporarily dismantle the interfering parts to gain access to the bolt head.
- 1.5 l (QG15DE)
- 1.8 l (QG18DE)
- Diesel (YG20DE)
- I don't know
Once the bolts are unscrewed, the generator is free. Remove it carefully, holding it with your hand so that it does not fall and damage surrounding parts. On Nissan Almera N16 The weight of the unit is about 5-6 kg, so it is heavy enough to accidentally drop it on a radiator or plastic bumper.
Features of working with tension rollers and brackets
When removing a generator, it is often necessary to check the condition of the tension roller. If the belt was too loose or, conversely, too tight, this could cause rapid wear of the generator bearings. Inspect the roller for play and extraneous noise when rotating.
Mounting brackets on older vehicles may show signs of corrosion or deformation. Before installing a new or remanufactured generator, check the seats on the cylinder block. If the threads are stripped, a repair insert or bracket replacement will be required.
- 🔍 Check the play in the tension roller
- 🔍 Clean the seats from dirt and rust
- 🔍 Inspect the bolts for damage to the threads
Before installing the new generator, apply a little graphite grease to the threads of the mounting bolts. This will ensure easy unscrewing in the future and prevent sticking.
Checking the removed unit and diagnosing faults
The removed generator should not be immediately thrown away, since often the problem lies in small things that can be fixed yourself. First check the brushes and slip rings. Worn brushes are the most common cause of lack of charge, and replacing them costs pennies.
Check the diode bridge for breakdowns. To do this, use a multimeter in diode test mode. If one of the diodes is broken, the generator will produce a pulsating voltage or not charge the battery at all. Also pay attention to the rotor bearings - they should rotate smoothly, without jamming or humming.
⚠️ Attention: Do not check the serviceability of the generator by “bridging” the plus and minus. This will instantly damage the diode bridge and may damage the vehicle's wiring.
If no visual defects are detected, but the generator does not work, the problem may be a broken stator winding. In this case, rewinding or complete replacement of the unit will be required. For accurate diagnosis, it is better to use a stand in a specialized service center.
Often the cause of the malfunction is not the generator itself, but worn brushes or an oxidized connector, which can be easily replaced without purchasing a new unit.
Important nuances during reassembly
The generator is installed in the reverse order of removal. It is important to observe the tightening torque of the mounting bolts. Too little tightening will lead to vibrations and rapid wear of the bearings, and excessive tightening can strip the threads in the aluminum engine block.
The belt must be tensioned with the correct tension. On Nissan Almera N16 The optimal tension is checked by deflecting the belt when pressing with your finger in the middle of the longest branch. If the belt is too weak, it will slip and whistle; if it is too tight, it will accelerate bearing wear.
| Parameter | Meaning | Note |
|---|---|---|
| Belt diameter | 13 mm | Standard size for most models |
| Power bolt tightening torque | 40-50 Nm | Use a torque wrench |
| Tightening torque for mounting bolts | 25-30 Nm | Depends on the specific bolt |
| Belt deflection | 10-12 mm | When pressed with a force of 10 kg |
Pay special attention to the connector connection. Make sure it clicks into place. After assembly, connect the battery and start the engine. The charge light on the instrument panel should go out immediately after starting.
Be sure to check the voltage at the battery terminals with the engine running: it should be in the range of 13.8–14.5 Volts. If the voltage is below or above this range, the voltage regulator is not working properly.Common mistakes when replacing a generator
One common mistake is to ignore the condition of the pulley. If the pulley shows signs of wear or does not rotate freely (in the case of an overrunning clutch), the new alternator can quickly fail. Always check the pulley before installation.
Also, many people forget to check the condition of the wires going to the generator. Oxidized or frayed wires create high resistance, which is why charging does not reach the battery, even if the generator is working. Test the circuit with a multimeter before final assembly.
- ❌ Do not tighten bolts by eye; use a torque wrench
- ❌ Do not leave dirt in the place where the generator is installed
- ❌ Do not ignore checking the condition of the belt and rollers
Correctly carried out replacement guarantees reliable operation of the vehicle's electrical system for many years. If you doubt your abilities or do not have the necessary tools, it is better to entrust the work to professionals.
How long does it take to remove a generator on a Nissan Almera N16?
For an experienced technician, removing and installing the generator takes from 45 minutes to 1.5 hours. It may take 2-3 hours for a beginner, especially if the bolts are stuck or access is difficult due to other parts.
Do I need to completely remove the battery?
It is not necessary to dismantle the battery case; simply disconnect the terminals. However, if the battery takes up a lot of space and interferes with access to the generator mounting bolts, it is better to remove it entirely.
Is it possible to replace just the brushes without removing the generator?
On the Nissan Almera N16, replacing brushes without removing the generator is impossible or extremely difficult due to the design features. Complete disassembly of the unit is required to access the back cover.
What to do if the belt keeps falling off?
If the belt falls off, check the alignment of the alternator pulleys, crankshaft and tension pulley. Also make sure that the belt is not overstretched and that the tensioner is working correctly.