The VAZ 2107 generator brushes, like any car parts, very often fail. Quite often the reason for this is: wear or freezing.
Those who are familiar with the principle of operation of a generator know that an excitation voltage is supplied to the armature through the brushes, which not only starts the electric machine (generator) into operation, but also regulates its output power.
The regulation itself occurs due to a special device, a relay-regulator, which can be implemented directly on the brush holder or installed separately (on earlier models).
The device of the VAZ 2107 generator
As a rule, such a malfunction manifests itself gradually, initially accompanied by short interruptions in the operation of the generator, gradually leading to its complete failure, but other options are also possible, for example, a sudden failure.
How to determine whether the VAZ 2107 generator brushes are faulty
Often, when carrying out a preventive inspection of a car, attention is not paid to various details. Alternator brushes are one of these little things; if they wear out, the generator will stop charging the battery. Experts recommend inspecting the brush assembly once every 45-55 thousand kilometers. Diagnostics of the brushes can be carried out without removing the generator, and in some cases it may even be possible to replace them without removing the main unit.
The main signs of malfunction of the VAZ 2107 generator brushes include the following:
- The car's electrical appliances suddenly turn off (even while driving);
- Headlights, dimensions and even interior lighting dim and flicker;
- A sharp decrease in the voltage of the vehicle's on-board network;
- A sharp discharge of the battery, which will be very difficult to recharge in the future.
Each of these points may indicate wear on the generator brushes, which are located inside this unit. Many people wonder how to check brushes.
What are brushes and what are they for?
It usually happens that when driving speed increases, the intensity of the low or high beam headlights, as well as the dashboard illumination, suddenly decreases, the radio and cigarette lighter do not work. Inexperienced drivers begin to look for the cause either in the electrical wiring, fuses, or associate this behavior of the devices with a short to ground. You can spend a whole day troubleshooting, but what a surprise it will be when it turns out that the whole thing is just two small black pieces of metal in the form of bricks with wires, which are called generator brushes.
Generator brushes
It is known from a school physics course that any generator basically has a stator (fixed part) and a rotor (moving part), each with its own windings, usually made of copper wire. Due to the force of the magnets, the rotor rotates, electricity to which is supplied through the armature and touching metal parts called brushes. Since the friction force on the ground acts on all objects, as a result of the constant rotation of the rotor, the parts we are considering are gradually erased, even though the material from which the brushes are made is quite strong.
How to check (ring) the brushes of a VAZ 2107 generator - step-by-step instructions
In order to check (ring) the brushes of the VAZ 2107 generator with your own hands, you need to get a multimeter and follow the following procedure:
- We connect the generator brush to the multimeter in the same way as shown in the figure.
- We start ringing the left generator brush first
- Now let's check the right brush
Where are the brushes of the VAZ 2107 generator
The generator brushes on the VAZ 2107 car are located in the rear half of the device (generator) and are held in place by one bolt.
The brush assembly itself is located next to the slip rings and is connected to the voltage regulator. The brushes are held in place by springs next to the rings. Knowing the circuit diagram of the generator, it is not difficult to find the brushes. To replace, you will need a standard set of tools:
- Several wrenches;
- A pair of screwdrivers;
- New brushes;
- Liquid WD-40 (in order not to strip the threads of the bolts).
Generator brushes.
How to determine that the generator brushes need to be replaced?
Generator brushes are a part that is found in almost every generator.
The more modern the car, especially a foreign car, the more electrical consumers it has, which in one way or another make life easier for the car owner. Accordingly, an increasingly important role among automobile units is played by the autogenerator, which supplies electricity to all consumers in the car.
What are generator brushes used for?
Using the generator brushes, the voltage from the regulator relay is supplied to the excitation winding - the rotor. The rotor has commutator rings attached to it - the rotor commutator to which the brushes fit tightly. To transfer current from the voltage relay to the rotor winding, the brushes must be in a certain position and pressed against the commutator rings with a certain force. To do this, they are installed in the seats of the brush holder and are pressed by a spring on the reverse side.
The material from which the brushes of foreign manufacturers' generators are made - a mixture of copper and graphite - differs from domestic ones in better wear resistance and conductivity. For this reason, it is not recommended to install this element on foreign cars from domestic cars.
How do you know when you need to replace your generator brushes?
- Car mileage, 150-200 thousand km. is the period when the part is worn out.
- The battery charging indicator light comes on and goes off again. This may continue for several days until the icon lights up completely.
- Loss of power or voltage drop due to a loose fit of a worn part.
- Voltage surges in the vehicle's on-board network may indicate a faulty part.
- If a lot of motor oil or other technical fluid gets on the generator, then the part is subject to increased wear.
How to check whether replacing the generator brushes is really necessary?
To determine the causes of the malfunction, it is necessary to disassemble the generator and inspect the generator brushes - they must be long enough and in contact with the slip rings.
If the remaining length of at least one element is less than 3 mm, replacement is necessary in any case. Also, the generator brushes must be well movable in their seats, have approximately equal residual length, must not be dirty, and the springs must press with the same force.
How to replace brushes on a generator? Procedure.
On many modern autogenerators, the brushes are integral with the voltage regulator relay, for example, this is true for Valeo, Bosch, Mitsubishi, Magneti Marelli; for Denso, the relay regulator is made separately from the brush assembly.
To replace the generator brushes , if they are built into the regulator relay, the tools you will need are a 40-100 W soldering iron, solder, flux, a 1.5-3 mm drill, a drill or screwdriver, as well as a tool for removing the regulator.
- Remove the protective cover
- Remove the voltage regulator relay (or brush assembly)
- From the side where the brush harness is attached, we drill out the contact so that the remaining parts come out. We try not to damage the spring, which is located inside the brush assembly.
- We take new brushes and check whether they move freely in their seats
- We insert the spring and insert the harness into the hole so that the required working length remains.
- We solder the contact point and cut off the remaining strands.
- We assemble everything in reverse order.
On some relay regulators it is possible to replace the generator brushes , but on some it is not possible to replace the part; you can replace the relay regulator assembly.
For example, on Bosch generators since about 2000, the relay regulator comes complete with brushes; replacement is not possible.
How to remove alternator brushes on a VAZ 2107 - step-by-step instructions
You can remove the generator brushes on a VAZ 2107 car as follows:
- The first thing you need to do is disconnect the negative terminal of the battery.
- Then we pull out the brush holder output connector.
- The brush holder is located on the end surface
(the opposite side from the pulley on which the generator belt fits) on the right side. It consists of two parallel metal pins and plastic holders. - Next, you need to find the screw securing the brush assembly and unscrew it. The assembly should now easily detach from the main part.
We check the protrusion of the brushes and their uniform wear. The working surface (length) of the brushes must be at least 12 mm; if less, then the VAZ 2107 generator brushes must be replaced. In addition, you should check the ease of movement of the metal structures in the holder; they should not rub or jam. If free movement does not occur, then it is recommended to also blow the generator rotor with compressed air.
Diagnostics of a removed generator
To check the generator removed from the VAZ 21, you should use a multimeter in ohmmeter mode. The probes are pressed against terminal 30 and the body of the unit. If there are contaminants and strong oxides on the case, they should be removed first, as they can affect the readings of the device.
You need to measure the resistance of each generator unit in turn. Parts that do not have the required resistance have become unusable. Most of them can be replaced at home using a minimal set of tools. To replace, you need to buy the same parts as those originally installed in the generator.
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Questions from readers related to replacing the brushes of the VAZ 2107 generator
And now I would like to answer the most common questions that readers send me related to replacing the VAZ 2107 generator brushes.
How much do brushes cost for a VAZ 2107 generator?
Alternator brushes for the VAZ 2107 are not expensive; in specialized Lada spare parts stores they can be purchased for only 50 rubles.
What brushes to buy for the VAZ 2107 injector generator
It is noteworthy, but motorists who are far from the design of the vehicle are sure that the brushes that are installed on generators of models from the same manufacturer correspond to each other, so it does not matter which models they are intended for. And this is absolutely correct, especially for the VAZ-2107, 2110, 2114 models. Therefore, do not worry if you managed to find brushes that are not for your model - they will definitely fit. Moreover, generator brushes for VAZ cars can be easily installed on BMW or Audi cars - they are a perfect fit. Therefore, if you need to purchase brushes for your VAZ, don’t worry, finding and replacing them will be very easy.
Replacing brushes on VAZ-2107, 2110, 2114 - is there a difference?
Brushes are the part that most often requires replacement, and therefore all car manufacturers design generators in such a way that no difficulties arise in such a process. If you purchased the car not so long ago, there will be no problems with replacing brushes. Their abrasion is a long process, depending on the intensity and service life of the machine. When purchasing a vehicle with a fairly high mileage, it is better not to wait for these parts to become unusable, but to replace them immediately. Fortunately, brushes are not in short supply, and their price is quite reasonable.
Replacing old parts
Drivers, who rarely go into the details of the structure of their cars, think that in the case of cars from the same plant there is no difference in the process of replacing brushes on generators, for example, in the popular models VAZ-2107, 2110, 2114. This is a correct guess, moreover, such an operation is the same on almost all brands of cars with an internal combustion engine. There’s even a little secret: alternator brushes from VAZ are perfect for BMW and Audi units of some modifications! The processing, however, is somewhat rougher than that of the Germans, but they work! And this is the main point.
