Hello, dear motorists! A modern person, for whom a car has become a reliable and indispensable assistant, should have at least a general understanding of its structure. At a minimum, you need to know the symptoms of major malfunctions and it is imperative to master the skills of eliminating the simplest malfunctions.
Although the concentration of service centers and private workshops is constantly increasing, it may happen that the nearest one will be too far away and you will have to rely only on your own strength.
If one of your fellow motorists asks what the generator belt tensioner pulley is for and why it is so important to monitor its condition, then this person really does not understand what they are talking about.
The heart of a car is its engine. If anyone thinks that the engine in a car only serves to enable it to drive, then they are very mistaken. The functions of the motor are much wider.
The first thing we see when we lift the hood is the many different devices with which the engine is “hung” on all sides. It is interesting and necessary to know why all this is installed in the engine compartment.
Alternator belt roller - spool, which is very expensive
Alternator belt tensioner
In addition to the fact that the internal combustion engine is the source of the force transmitted to the wheels, it ensures the functioning of numerous machine devices and its own systems.
At the front of the engine, the crankshaft necessarily has a one-, two-, or three-row pulley, which is connected via a soft belt drive to equipment such as:
- generator;
- cooling system pump;
- gas distribution mechanism;
- air conditioner;
- power steering.
Each of these devices performs its own function, but most of them, like the motor, cannot do without a generator.
Stable operation of the generator as a source of energy is possible only if the belt tension is sufficient. Most foreign and domestic cars, especially new models, have a special device - a generator belt roller, which regulates the degree of tension of the belt drive.
There are several modifications of such devices. One of the simplest is a roller whose center is shifted. When the eccentric rotates, the belt is tensioned and secured using a bolt.
Another option is to install the roller on a movable bracket and tension it with a bolt. Regardless of how the generator belt tensioner roller performs its task, it is necessary to monitor its condition and carry out repairs at the slightest suspicion of a malfunction.
Replacing the tension roller of the alternator belt is a matter of five minutes
The generator belt tension roller has a very simple structure, and its most important part is the bearing. At every opportunity when a belt is loosened or replaced, the condition of the bearing should be diagnosed.
When rotated by hand, a serviceable roller spins quietly, without snagging, jerking or play. If the roller life is exhausted, it should be replaced. This is not difficult to do in a garage with a minimal set of tools.
To replace the tension roller, you must perform the following steps:
- immobilize the crankshaft using a pry bar or other tool by inserting it into the teeth of the clutch disc crown;
- loosen the bolt securing the roller or tensioner bracket, relieving tension from the belt;
- Unscrew the axial bolt completely and remove the roller;
- install a new roller and adjust the belt tension.
Replacing the generator belt tension roller should always end with checking its functionality and re-inspecting it. Please refer to your vehicle's owner's manual for detailed instructions on how to check that the alternator belt tension is correct.
It is important to remember that excessive tension leads to rapid wear of the roller bearing and, accordingly, to the need to replace it.
A modern motorist, for whom the garage is a “second home,” should know at least the most general concepts and ideas about what the structure of a vehicle is. At a minimum, this is necessary in order to identify all the symptoms of malfunctions that may arise at any moment, as a result of which they will need to be eliminated, which will also require certain knowledge and skills.
- 1. The generator belt roller is a spool, which is very expensive.
- 2. Replacing the tension roller of the generator belt is a matter of five minutes.
All this is due to the fact that even with a huge number of different workshops and service centers, in the middle of the road, when a breakdown occurs, the motorist will not find a single assistant, as a result of which he can only expect help from himself. If someone you know asks a car enthusiast why a generator belt tensioner pulley is needed, why even monitor the condition of this device, and claims that no one needs it, then he will be deeply mistaken and will be wrong. It's no secret that the main element of a vehicle is the engine. The functionality of this device is very diverse, so without its normalized state, the operation of the vehicle cannot be successful.
Thus, even the most minimal malfunction of an element that is “insignificant,” as the motorist thinks, can contribute to the breakdown of the entire system. If during periods of direct movement certain irritating factors arise, which take the form of whistling, tapping, creaking, or metallic ringing, then you must immediately turn your attention to the cause of this kind of breakdown. Otherwise, you can forget about your own comfortable movement, and you can also get a lot of material worries about restoring certain parts of the system.
We recommend: Gear oil - what is it?
The alternator belt is not unique, as it can also malfunction. Sometimes, when the belt whistles, a motorist resorts to replacing the generator, thinking that this will all end there. And how big a surprise the car enthusiast will be after this, noticing that nothing has changed. If all the rules for replacing a new belt and a new bearing are followed, the repair may not always be successful. This is because the belt tensioner may be damaged. This is precisely the detail that is of last interest to specialists from automotive services, since they believe that it is eternal. However, this device may also malfunction.
For normal and stable operation of the belt drive, the belt itself must be in ideal condition.
Its edges should not be stretched or peeling. In addition, a belt that has transverse or longitudinal breaks should not be allowed to be used. At the break of the belt itself there should be no cracks or any crumbled areas.
One of the most important factors that directly influence the quality of the generator is the degree of belt tension. So, everything will depend on the model of the internal combustion engine and the type of belt. To adjust this parameter in the automotive environment, there are certain devices through which the required tension can be achieved. Such a device could be a bracket, through which the generator itself will be pulled away from the engine in order to tension the belt. In addition, for normal operation of the electrical energy supply system, such systems must have a generator. The rotor of the generator device must be in continuous rotation, which can be ensured by means of a belt connection to the crankshaft of the car.
There are many reasons why the alternator belt squeaks and rubs. Thus, the belt itself could have become worn out, as a result of which its tension is no longer possible. In addition, the belt itself, even when initially installed by manufacturers, was invented from low-quality material. You should not think that normal work can be carried out even if the belt or pulley itself is exposed to various types of technical fluid, coolant, or antifreeze.
The generator belt roller is a spool, which is very expensive.
In addition to the fact that the internal combustion engine is the source of the force transmitted to the wheels, this device ensures the functioning of many different vehicle devices and its own subsystems.
The crankshaft is located at the front of the engine and necessarily has a single-row, double-row or three-row pulley. This device is connected directly to the generator, cooling system pump, power steering, gas distribution mechanism, through a soft belt drive.
All these devices perform their assigned functions, although most of them, like the engine itself, cannot but have a generator in their “helper arsenal”. Stable operation of this device as a source of energy can only be possible under one condition, which is sufficient belt tension. Most vehicles, both domestic and foreign, especially new models, have a special special-purpose device - an alternator belt roller. This part is capable of adjusting the degree of tension of the belt drive.
In the modern world, there are several modifications of this device. So, the roller may have an offset center, or the roller will be installed using an ordinary bolt directly on the movable bracket. You should always monitor the condition of this part, since it is because of it that you can get many problems in the future.
Replacing the tension roller of the generator belt is a matter of five minutes.
The design of the generator belt tension roller is quite simple. The main part of this device is the bearing. When a belt is replaced or loosened, diagnostics must be carried out at every opportunity to determine the general condition of the bearing. If rotation by hand is indicated by a quiet torque of the roller, then it is in good condition. If the life of the roller has already been exhausted, then you need to make a simple replacement, which can be done in your own garage.
In order to replace the tension roller device, you need to go a short way: immobilize the crankshaft using a pry bar or other similar tool, inserting it directly into the clutch disc teeth; you need to loosen the bolt by which the roller is attached to the tensioner bracket, apply stress relief to the belt; the axial bolt must be completely removed and the roller removed.
That's it, after all that has been done, you just need to install a new roller, also adjusting the degree of belt tension. Replacing a tension roller should always end with diagnostics and testing the functionality of the device.
Subscribe to our feeds on social networks such as Facebook, Vkontakte, Instagram, Pinterest, Yandex Zen, Twitter and Telegram: all the most interesting automotive events collected in one place.
Why is there a belt tensioner pulley in a car?
What is this and what is the video for?
Despite the fact that in any city the number of specialized service centers is constantly growing, such a breakdown can occur at the most inopportune time and place. Therefore, it is very important to know how to carry out such a procedure on your own.
The first thing we see when opening the hood of a Renault Logan is the engine. But those who think that it is needed only to keep the car moving are deeply mistaken. In fact, the motor is designed to perform a number of very important functions. In addition to the fact that the internal combustion engine (internal combustion engine) is a direct source of energy transmitted to the wheels, it also ensures the functioning of a number of systems, such as air conditioning, power steering and, of course, a generator.
All of the above devices are designed to perform their function, but most of them, including the engine, cannot do without the energy generated by the generator.
The generator charges the battery; if the tensioner pulley is faulty, the generator will not provide the required charge and you will stall.
Clear and stable operation of the generator is possible only when the tension of the belt drive is sufficient to supply energy to all consumers. Therefore, almost most cars, regardless of production, have a corresponding alternator belt pulley.
Diagnostics of the drive belt tensioner
The drive belt tensioner must be checked for serviceability when at least one of the above symptoms appears. Other structural elements also need diagnostics. Diagnostics is performed in several stages:
- It is necessary to visually familiarize yourself with the belt and the equipment driven by it. To do this, start the power plant and check whether there are vibrations of the belt, pulley or roller.
- Check the tension of the alternator belt. To do this, stop the engine. Next, on the largest span between the pulleys, take the belt and try to turn it clockwise. If you can turn it 90 degrees, then its tension is fine. Otherwise, the rotation angle will be smaller or larger, and then adjustment will be required.
- The next step is to remove the belt and check its condition. It is also necessary to check the pulleys and rollers for play. Removing the belt is quite simple. To do this, you must loosen the tension pulley nut. After this, it must be removed from the pulleys. Before doing this, remember the position of the belt between the pulleys, because you will then have to put it back on. It is recommended to take a photo of the position with a mobile phone camera. After removal, check that there are no cracks or peeling on the belt. Belt wear should be even. If any of these defects are detected, feel free to change the belt. Note wear on one side. When such wear occurs, the roller mounting stud or bracket becomes bent, causing misalignment. If this misalignment is not corrected, the belt will not last long.
- The play on the pulleys is checked. Rotate the roller and make sure that there are no jams or jams. If they are present, there will be severe wear of the bearing, and the generator belt tension roller will need to be replaced. Also carefully inspect the working surface of the plastic pad: there should be no grooves on it. If the surface is uneven, the drive belt tension roller must be replaced.
- If after replacing the belt the hum and squeaking does not disappear, then the problem must be looked for in other elements. The drive of these elements occurs due to belt tension.
This is interesting: How to change the CV joint boot on a Daewoo Nexia car
Tensioner device
The tensioner design includes the following elements:
- belt;
- video clip;
- bracket;
- connecting bolts and nuts.
The roller is a bearing with a seating sleeve inside and a plastic coating on the outside. The belt moves along the roller. The roller is mounted on a bracket, which, in turn, is attached to the car engine using bolts and nuts.
We recommend: Robot gearbox: what is it
There are two modifications of the tensioner:
- Eccentric. Includes bearing, plastic cover and bushing. The bushing has a through hole that is offset from the center. This hole is used to secure the roller to the car engine. To obtain the required belt tension, the eccentric is rotated and then the result is secured with a bolt.
- Bracket. In this modification, the roller is fixedly mounted on a bracket. The structure is attached to the power plant using bolts. To adjust the belt tension, the bracket is moved relative to the engine. This modification is more complicated than the eccentric one, but this does not make it any less reliable.
Some car factories install rollers with a spring bracket in their cars. In this design, the spring independently regulates the belt tension, that is, the unit is self-regulating.
Whatever device the belt tensioner has, the list of its main elements remains unchanged.
ATTENTION: The weak point of any tensioner is the bearing, which is constantly under load and wears out quickly. It is recommended to change this element every time the belt is replaced.
Design principles
Operation of the generator and the units dependent on it: battery, electronic devices is possible only if the belt tension is normal. Each manufacturer tries to improve the components and design of the models they produce, but the principle of operation and their possible configuration are always the same. The standard components of this unit consist of the following parts:
- a bracket attached to the engine block with several bolts;
- tension roller with internal bearing;
- roller fixing bolt.
There are a couple of simple modifications to this device:
- a tension roller with an offset center, by rotating the eccentric, we achieve the required tension, which is secured with a bolt;
- the roller is mounted on a movable bracket; in this version, the belt is tensioned using a corresponding bolt.
In any of these versions, the main element on which the main load is directed is the roller bearing.
Why do you need a generator and how to check the tension of the generator belt
Checking the tension of the generator belt
On some small commercial vehicles (Fiat Doblo), the drive belt is tensioned by deflecting the alternator housing.
The generator is the source of electrical energy in the car. When the engine starts, the generator rotor rotates at a certain angular speed, which is communicated to it through the drive belt. A magnetic field is created in the stator windings, which leads to the generation of electric current. But the current has a variable value, and to power all devices on the on-board electrical network, the current must be constant. In such cases, a diode bridge is installed on the generator, which rectifies the current. On some small commercial vehicles (Fiat Doblo), the drive belt is tensioned by deflecting the alternator housing, i.e. The engine design does not provide for the installation of a tension roller. However, the most common is to tension the drive belt with a special roller, and there can be several of them: tension and bypass. Some rollers are self-tensioning, i.e. It is enough to install them on the engines and remove the bracket that secures the roller body and the roller itself, and it will create the necessary pressure on the belt. In other cases, when tensioning the roller, it is necessary to align the marks to tighten the belt. The tension of the generator belt is checked during maintenance. For diagnostics, a special device is used that will show in kgF (kilogram force) the pressure that must be applied to deflect the belt. But the easiest way is to use two 10 - 20 centimeter rulers: you need to place one ruler horizontally on the belt, and move the second in a vertical plane. The normal tension of the generator belt will be no more than 1.4 - 1.6 mm.
DIY Replacement Guide
Tips from experts on replacing the generator belt roller on a Lada Granta with your own hands
How to replace the generator belt tensioner roller at home? First of all, it is necessary to dismantle the strap itself, after removing which you need to check the condition of the bearing element. In normal condition, the bearing should have no play when you turn it by hand. In addition, the rotation of the device itself should be free, without any extraneous sounds (the author of the video is Roman Romanov).
It would not be superfluous to carry out a visual diagnosis of the part’s bracket and assess whether the fastening screw is worn out. As the vehicle is used, the brackets may bend, causing the belt tensioner to become dislodged and require repair. If the bracket is bent, this will cause the load on the strap to be uneven, and one side will stretch more than the other. Ultimately, the strap will simply wear out quickly, it will begin to make uncharacteristic noise, whistle, it may slip, and in some cases even fly off.
As for bracket bending, this problem is mainly relevant for older vehicles, but sometimes it also appears in relatively new cars. If we are talking about a car that has been in use for a long time, then the problem is wear and tear, and if the bracket is bent on a new car, most likely it is a factory defect. If you notice malfunctions in the operation of the bearing device or other system components, it is advisable to replace them.
So, replacing the tension roller is done as follows:
- First you need to fix the crankshaft so that it does not move. To do this, you need to install a thick screwdriver or crowbar of the appropriate diameter between the teeth of the clutch pulley crown.
- After this, you need to loosen the screw that secures the roller or bracket itself, in this case it all depends on the specific engine. Having done this, the tension of the strap should loosen.
- The next step is to unscrew the screw that secures the roller itself.
- Before changing the element and tightening the alternator belt, check the condition of the bracket. If it is in a sad state, then it is better to change it.
Sorry, there are no surveys available at this time.
Depending on the design features and materials of manufacture, timing belt tensioners have different service lives and require repairs at different mileage. The least durable models are characterized by classic mechanical models (slider and eccentric), which are manually adjusted and wear out quickly.
At the same time, auto experts advise replacing the rollers along with installing a new belt or after each technical inspection. Therefore, timing rollers are sold together with a set of other components of this system.
Automated devices are less subject to wear and tear and can be operated until the engine is overhauled. They are replaced only if they fail. To change the mechanism, you need to familiarize yourself with the technical characteristics of the vehicle and select the model that is installed at the factory. To do this, you need to look at the markings and make sure that they correspond to the factory ones. Otherwise, the normal functioning of the gas distribution mechanism and power unit may be at risk.
Installation of a new part is carried out both with the belt drive removed and with the belt drive installed (if the engine configuration allows it). Automatic releases only need to be assembled and installed, while mechanized ones need to be adjusted using special devices, such as a key for rotating the eccentric roller and a dynamometer, which allows you to set the optimal tension. Actions are carried out in compliance with the manufacturer's instructions and recommendations.
If you select, install and adjust the tensioning mechanism correctly, it will perform its tasks without deviation, maintaining the functionality of the engine in any conditions.
Video about installing the timing tension pulley:
Generator drive device
The main condition for the correct functioning of the generator is the correct transmission of rotation from the power plant. To generate the required amount of electricity, the element must rotate at high speed.
The alternator drive belt must be tensioned for proper transmission. If the belt sag, it will begin to slip on the pulleys. If the belt is overtightened, there is a risk of premature wear of the bearings, working surfaces of the pulley and belt.
To avoid these troubles, belt tension adjustment was included in the design.
In modern cars the number of attachments is large. This equipment is also driven by the crankshaft pulley, including the power steering pump and air conditioning compressor.
The drive of these two units and the generator is carried out using a single belt. Because of this, it is impossible to adjust the tension of the drive element using a generator. Such cars have a complex belt position configuration. Belt-driven equipment is located at different levels.
How to change the alternator belt tensioner pulley? To do this, you need to understand its structure. The generator belt tensioner roller is a bearing with a plastic lining on its outer race. The pad has a working surface along which the belt moves. There is a landing sleeve inside the roller. There are two types of rollers:
- Eccentric . The design of this video is quite simple. It contains only a bearing, a plastic lining and a bushing. A through hole passes through the bushing, offset away from the center of the roller. The roller is put on a pin through the hole, which is installed on the engine. To tighten, the roller must be rotated relative to the bolt.
- Roller with bracket . In this design, the roller is fixedly mounted on a bracket. The structure is attached to the power plant using bolts. Moving the bracket relative to the engine adjusts the tension. Manufacturers sometimes use rollers with a spring bracket. The spring allows you to independently adjust the tension.
The bearing is the main weak point of the roller. This part is forced to constantly experience loads. Wear of a part sometimes even ends in its complete breakdown.
It is recommended to change the bearing every time the belt is replaced.
Tension effect
The bracket is responsible for fixing the unit. It sits firmly on the power unit block and is secured with several bolts. The belt rotates through a tension roller equipped with an internal bearing. The roller itself is also securely secured from turning with a locking bolt.
Tensioner kit
It is noteworthy that there are several options for modifying the device:
- for a better tension effect, the roller is adjusted by rotating the eccentric (after the required tension is achieved, the roller is fixed with a bolt);
- the roller itself is fixed on a movable type bracket (to tighten the belt, you can use the bracket bolt).
In general, tension adjustment is a priori provided structurally. Interestingly, on older car models, belt tension was adjusted using the generator itself.
In older cars, the generator was mounted in two places. One of the attachment points was an adjustment point. The generator could be pulled away from the internal combustion engine by loosening or removing one mounting nut. In this way, the required tension was ensured, and at the end the nut was tightened.
Nowadays, many additional elements have appeared that are driven by the crank shaft pulley. Simultaneously with the generator belt, the pump pump, air conditioning compressor, etc. receive rotation from the crankshaft. And due to the fact that there is only one belt, it is no longer possible to adjust the drive element with the generator itself.
In addition, the belt sits not on two pulleys, as before, but on four. And the equipment that the belt drives is located at different levels in relation to each other.
Belt
Only a solid belt can function normally. If the edges are stretched or the material delaminates, then such a belt is considered unusable.
Generator belt
In addition, the product should not have longitudinal or transverse tears. There are no cracks or other signs of wear on the belt break.
How many cases have there been when a master, having discovered weak tension and problematic operation of the generator, adjusted the unit, changed parts, but everything was useless?
The specialist’s mistake was that he did not focus on the condition of the belt. The latter was worn out to the extreme, which a priori excluded the possibility of adjusting the tension
Most belts that become unusable over a short period of use are initially made from low-grade material
Therefore, when choosing a product, you should pay attention to this, try to buy original belts that are made with high quality
The reason for rapid belt wear is also the contact of oil or any other technical liquid with the material.
Video clip
This is one of the components of the assembly that is worth its weight in gold. It is the roller that bears the entire load; it is the roller that is responsible for the normal operation of the drive belt. It is clearly noted that it is akin to a spool - small, but bold.
The generator belt tensioner roller is that seemingly insignificant element that was mentioned at the beginning of the article. What some may think is a secondary component of the automotive system, in fact, performs primary functions. The failure of a roller is a fracture of the entire system, you can be one hundred percent sure of this.
Very often, when the belt whistles, the owner decides to replace the generator itself or the belt, and in some cases, renew the bearing. But imagine his surprise when, after all these manipulations, nothing really changes. In fact, the reason lies in the tensioner and its pulley.
Off-center roller
The roller is the last detail that attracts attention. Many people, even service workers (mostly newbies), mistakenly believe that the tensioner pulley is an eternal thing.
In reality, this is not the case.
Once you study its operating principle, everything becomes clear. The roller ensures smooth operation of the unit and allows tensioning to be carried out.
Today there are several modifications of the video. As a rule, rollers with an offset center are considered the most effective. Tensioners have a simpler design, fixed with an ordinary bolt directly to a movable bracket.
No matter what model the video is, it needs an eye and an eye. It is recommended to monitor the condition of the part periodically, to insure against more complex and costly problems.
Alternator belt roller for Renault Logan
The tensioner roller is indicated by a line in the figure.
- On Renault Logan cars, the tension roller of the alternator belt is installed on cars that are equipped with power steering and air conditioning, or one power steering.
- On models that do not have such options, the alternator belt is tensioned using a bolt on a special strip.
Let's consider the options for replacing the roller separately in each case.
Replacing the tension roller of the alternator of a Renault Logan I generation car, equipped with power steering and air conditioning
The roller is marked with the number 2
The tension roller is shown in the diagram as number 2 .
This is what the old video looks like
- To replace it, you need to remove the right wheel and the protective shield of the engine compartment.
- Next, using a key set to “13,” we turn the roller mounting bolt clockwise (bypassing the force of the tension spring), at the same time, using a metal rod with a diameter of 5–6 mm, we fix the roller bracket by inserting it into a special hole. This way you can loosen the drive belt itself for further removal of the roller.
- In order to unscrew the roller from the engine housing, it is necessary to unscrew the two bolts securing the housing of this tension device, which is assembled with the roller itself.
The process of filming the video in the photo
Installation should be done in the same way in the reverse order, and special attention should be paid to the high-quality fixation of the bracket itself.
We recommend: Features of adjusting and setting the ignition of the VAZ-2106
Replacing the tension roller of the alternator of a Renault Logan I generation car, equipped with power steering and without air conditioning
The tensioner pulley is numbered 2 in the diagram.
In order to remove or adjust the generator belt through the adjusting roller ( number 2 ), it is necessary to loosen the bolts securing the roller 4 and rotate the adjustment bolt 3 clockwise. If the roller itself needs to be replaced, then dismantling is carried out by removing the bolts securing the roller from the engine housing.
Filmed video
After completing all operations, the assembly of the structure occurs in the reverse order.
After replacing such “consumables”, you need to start the engine and make sure there is no extraneous noise at idle or whistling from under the alternator belt. If nothing of the kind is installed, then the replacement of the tension roller can be considered complete.
When carrying out repair work related to belts, pay attention to the condition of the timing belt, replace it if necessary (read more about replacing the timing belt on a Renault Logan).
How to change timing belt rollers with your own hands?
To correctly replace belt tensioners in the timing system, the car owner needs to strictly follow the step-by-step instructions, and also take into account the recommendations of consumables manufacturers.
Step-by-step instructions for replacing timing rollers:
- First you need to turn off the car engine.
- Then open the hood, and then remove the protective cover for the timing system. Here it is worth considering the following: in some cars the location of technical components is quite cramped, so the motorist will have to dismantle them. Such systems include: radiator cooling system;
- air conditioner refrigerant reservoir, etc.
After the work has been completed, the car owner needs to start the engine and make sure it is working properly. If no malfunctions are observed during engine operation, all work has been completed correctly.
In the end, I would like to note: carrying out all technical work independently not only saves money, but also gives the motorist the necessary experience in carrying out repair work. Acquiring this type of skill will allow the motorist not to worry about the need for urgent repairs on long trips.
Troubleshooting
The following signs indicate a malfunction or wear of the alternator belt tensioner:
- the headlights shine dimly;
- The indicator lights on the dashboard do not seem as bright as usual;
- interior heating works intermittently;
- the car siren has become duller and lower;
- the operating intervals of windshield wipers and turn signals have increased;
- There are no battery charging indicators;
- The alternator belt tensioner assembly makes a whistling sound, hum or squeak;
- When the engine is turned on, the roller or belt vibrates.
If at least one of the above symptoms is present, we diagnose the condition of the alternator belt tensioner. We perform all operations in a certain sequence.
Step 1. Open the hood of the car and conduct a visual inspection of the unit. If cracks, traces of rust, or misalignment of the tensioner block or tensioner arm are detected, we replace, adjust, or adjust the worn parts.
Step 2. Start the engine and observe the operation of the unit. We pay attention to vibration, noise (creaking, crackling, whistling), resistance during rotation, beating of the lever during operation and other deviations from the norm. If extraneous sounds are heard from the unit, we try to understand which part is causing them.
Step 3. Check the serviceability of the video. To do this, remember the position of the generator belt and remove it from the unit, having first loosened the adjusting nut. Next, we proceed to inspect the video. Its surface should be smooth, without deep nicks and other damage that contribute to belt wear. We rotate the roller and make sure that the rotation is free and that the roller does not jam. If the roller is in order, we install it in its original place.
Step 4. Check the integrity of the belt. There should be no peeling or cracks on its surface, in the presence of which the belt must be replaced. We pay special attention to the uniform wear of the belt. If there is wear on one side, inspect the bracket or stud for attaching the roller. These parts may be bent or askew. If the misalignment is not corrected, the new belt will not last long.
Step 5. Check the belt tension. To do this, with the car engine stopped, we grab the belt and try to turn it 90 degrees clockwise. If the belt rotation angle deviates from 90 degrees, it needs to be adjusted.
ATTENTION! Experts recommend checking the tension of the generator drive belt at least once a week, and constantly having a new belt in your emergency supply.
Node diagnostics
The driver should know that there are direct and indirect signs indicating a malfunction:
- there is no indication of battery charging on the instrument panel;
- when the engine is on, you can hear the generator belt tensioner roller whistling, which can be felt even without opening the hood;
- a characteristic sound is also a metallic hum from a worn bearing;
- there is noticeable vibration of the tension roller or working belt, characterized by wear of the bushing, which must be done immediately;
- the deflection measured on the belt significantly exceeds the permissible 1.5 cm;
- the presence of free play on the roller or tension pulley is a sign of bearing wear;
- Some of the sides of the belt are noticeably worn out or stretched, which indicates misalignment or deflection in the bracket design.
Malfunctions of the electrical equipment of the car
The main reason for the decrease in generator performance is the weakening of the belt tension. But before you approve anything, it is necessary to diagnose the electrical equipment of the car. Signs and causes of malfunctions of on-board network devices:
The main reason for the decrease in generator performance is the weakening of the belt tension.
- headlights flicker when the engine is running;
- The alternator belt whistles when starting on a cold engine;
- when using electrical appliances, fuel consumption increases significantly;
- extraneous noise in the drive belt area;
- The generator belt tensioner roller whistles;
- The battery is often ;
- mechanical damage to the belt and roller.
The worst thing that can happen to the belt is a break, and the roller can jam. In these cases, the generator will not work, and its functions will be taken over by the battery. But the battery will not last long because it has limited capacity. The main purpose of the battery is to supply the starter with starting current for reliable starting of the engine. The generator, among other things, performs the function of recharging the battery.
Purpose and functions
The purpose of the generator belt tension roller is to ensure the uninterrupted functioning of this unit. The latter, in turn, allows you to provide power to all electrical equipment of the machine. The tension of the generator belt plays an important role in the operation of the unit, since if it is insufficient or excessive, this will lead to incorrect operation of the latter. To ensure optimal tension, modern cars use an alternator belt tensioner.
This element usually has a simple design and is fixed to the engine block thanks to a special bracket.
The design of this device includes:
- generator belt tensioner roller together with a bearing device;
- screw securing the belt tension roller.
New roller for generator unit
If we talk directly about mounting the bracket, this component is usually installed on the motor using several screws. Depending on the machine, fastening can be done using studs secured with nuts. In fact, it is the tension roller of the generator that performs the function of adjusting the degree of tension.
Depending on the engine, the alternator belt tensioner pulley may have differences in its design. For example, one of the simplest options is a roller in which the center is offset - such devices are usually fixed with a screw. According to this scheme, the strap is tightened while the eccentric rotates.
An equally common option is a device located on the movable bracket described above - in this case, the tension is also carried out with a bolt. In both options, the working condition of the element in any case needs to be monitored; if you notice that the part is worn out, then it needs to be changed as quickly as possible. Otherwise, you may encounter the problem of wear and complete failure of the part, which will lead to the impossibility of normal functioning of the generator unit.
It will be useful: Which charger for a car battery to choose
Signs of a faulty alternator belt tension roller
First, make sure that the alternator belt tensioner pulley needs to be replaced. Signs of its malfunction are listed below:
- the generator does not fully charge the on-board network or it does not receive electricity at all;
- from the side where the belt is located, a sound similar to squeaking is heard;
- a hum is heard;
- the roller or belt vibrates a lot when the power plant is running;
- there is play in the video;
- The belt is worn on one side.
This is interesting: Causes of persistent chemical deposits in passenger car engines
Some of these symptoms may indicate a problem with the components that drive the roller. A hum and squeaking noise may indicate wear on the bearings of the power steering pump, air conditioner or compressor. The malfunction may lie in the generator itself.
Visual inspection of faults
Before changing the generator belt tensioner roller, it is necessary to identify the reason or several reasons why the malfunction occurred. To achieve this, the following activities are carried out:
- the operating conditions of the entire chain involved in the operation of the generator are assessed;
- the root cause of node failure is determined;
- the current wear of structural elements is monitored;
- a visual inspection of belt marks on the tension and guide rollers is carried out, the presence of which indicates that the wear of the bearing is to blame for the displacement;
- Check for unacceptable contamination of surfaces and, if necessary, carry out mandatory cleaning.
In some cases, replacing either the roller or the belt does not give the desired result. The reason may be that antifreeze or oil gets on the belt.
Do-it-yourself replacement of the Hyundai Solaris alternator belt tensioner roller
In Hyundai Solaris, the tension roller can be called a sore spot. Often they even replace it during the warranty period. If your warranty has expired or you are not serviced by an authorized dealer, you can replace the roller yourself. Typically, the tensioner is replaced simultaneously with the replacement of the accessory belt.
To replace the tensioner you need:
- Remove the mudguard of the engine compartment on the right.
- Using a screwdriver, press the tensioner to loosen the belt tension.
- Remove the alternator belt.
- Unscrew the tensioner mounting bolt.
- Pull out the pain and remove the tensioner assembly.
- Install a new tensioner, belt and assemble the parts in reverse order.
Usually there are no difficulties when replacing the tensioner. When installing, make sure that the mark on it fits into the special opening on the cylinder head. If you doubt your own abilities, it is better to consult a specialist.
After installation, check that the belt runs smoothly and without any extraneous sounds. If installed correctly, the Solaris generator belt tensioner roller will last until the next belt replacement.
Replacing the roller yourself
In contrast to a V-belt timing drive, replacing a car's alternator belt roller is much simpler. Therefore, if you follow the recommendations below, the car owner will be able to perform the operations on his own, after first making sure that the cause of the malfunction really lies in the wear of this consumable.
Diagnostics
Malfunctions of the tensioner installed on the generator belt drive are diagnosed in 90% of cases by a characteristic sound resembling a whistle. However, the tension may weaken, not only from the wear-out of the roller, but also for other reasons:
- misalignment - in the absence of alignment of the shafts and pulleys of the belt drive, accordingly, the sound arises due to poor contact of the belt in the cross section, one edge wears out intensively, the other remains intact
- ingress of lubricant - in the absence of tightness, oil can get onto the belt, sharply reducing friction, leading to slipping and destruction of the rubber, it is recommended to remove the consumable part, wipe it or replace it entirely, eliminating the cause of the oil leak
- hard belt - usually whistles when starting, then heats up, the sound disappears, this is caused by an increase in loads on the pulleys
- bearing wear - the whistle is slightly different in tone, the cause is the wear of the race, the bearing is removed for replacement
- belt sagging - no need to change anything, tensioner needs to be adjusted
- lack of battery recharging - determined by the instruments on the panel
In other cases, the whistling can be eliminated by removing the roller and replacing it with a new consumable. The shine on the working surface of the belt indicates its frequent slipping, the cord peels off from the oil, but cracks on it under normal belt tension are much more difficult to notice.
Dismantling
Before changing the alternator belt tensioner roller, it is necessary to loosen the V-belt drive:
- the tension roller adjusting bolt is loosened until the belt can be removed
- together with it, 2–3 nuts of the tension bar are loosened (usually 10 and 13)
Attention: Depending on the layout of components/assemblies under the hood of a particular car model/brand, in order to provide access to the tensioner and roller, accordingly, some components and parts will have to be dismantled.
For example, on a ZAZ SENS you need to remove the belt that drives the air conditioning compressor shaft. You won’t have to remove anything for Chevy/Niva and Lada Granta.
Installing a new roller
When changing a worn-out generator belt tension roller on your own, you need to take into account the following nuances:
- power is taken from the output shaft of the internal combustion engine to several auxiliary devices of the machine
- on most cars, the V-belt drive is common to all specified consumers
- therefore, the tension force, the maximum permissible belt deflection and the location for measuring this deflection are not the same for machines from different manufacturers and even modifications in their range
It will be useful: What is the tank volume of the Kia Rio
Therefore, you should first study the user manual, clarifying these three parameters.
Install the roller in the reverse order of the above instructions:
- the bearing is put on the seat
- the roller is fixed with a bolt
- the rod adjusts the maximum deflection at a certain compression force of the belt in a specific location of the V-belt drive
For example, in a Chevy/Niva, the deflection is measured between the generator and pump pulleys; its value must be adjusted to 12 mm with a force of 10 kg. For ZAZ SENS this value is reduced to 8 mm with a force of 7.8 kg. To measure you should use the following diagram:
- the metal ruler is positioned in the desired area
- a steelyard hook clings to its upper edge
- The steelyard is used to adjust the force specified in the instructions for the car.
- The ruler scale allows you to measure vertical movement relative to any part under the hood of the car
Instead of a ruler, you can use, for example, a wooden bead with a tape measure attached to it.
Thus, following the recommendations given, you can diagnose and replace the roller with the bearing of the generator belt tension system yourself. The deflection parameters and the force of pressure on the belt during adjustment should be taken from the operating instructions for the specific car.
