Shaft - a part of machines and mechanisms designed to transmit torque along its longitudinal axis. The most common are shafts assembled with impellers, pulleys, sprockets, etc. installed on them.
Like any other mechanical part, the shaft may be incorrectly installed in bearing supports, have inhomogeneities in the density of the material, violations in the geometry of manufacture and insufficiently accurate fit of parts rotating with it, etc. As a result of the above reasons, unbalanced masses appear in the rotating shaft, causing low-frequency vibrations of the shaft. These vibrations can be so significant that they can lead to shaft bending and complete destruction of bearing assemblies and other machine parts. That is why it is so important to balance the influence of unbalanced masses by performing a shaft balancing procedure.
Earlier, we have already considered the types of rotor unbalance and the corresponding types of balancing - static and dynamic. It was noted that the accuracy of dynamic balancing is an order of magnitude higher than the accuracy of static balancing, and that for rotors whose diameter is much larger than the length (pulleys, impellers, sprockets), only static balancing can be limited.
With regard to the case of shaft assemblies (for example, a shaft with an impeller), in most cases it is possible to restrict oneself to a static balancing of the impeller and dynamic balancing shaft assembly on the machine and / or in their own supports. In fact, a perfectly balanced shaft assembly is a shaft with separately balanced parts, then balanced as an assembly on the machine, and finally balanced in its own supports.
According to the statistics of the BALTECH company, a recognized expert in the field of balancing, proper balancing of the shafts of rotating machines increases the service life of impellers and impellers by 23%-100%, and also increases their useful power by 10%-25%.
Balancing shafts in their own bearings must be entrusted to specialists technical service"BALTECH", armed with the most modern balancing tools - mobile kits "PROTON-Balance-II" and BALTECH VP-3470 and the program of multi-plane balancing BALTECH-Balance.
The main production direction of the BALTECH company is the production of modern pre-resonance machines for horizontal, vertical and automatic type for rotors of various configurations, weights and dimensions. Let us consider in more detail the possibilities of balancing machines "BALTECH" on the example of a vertical balancing machine series BALTECH VBM-7200.
Balancing machines of the BALTECH VBM-7200 series are designed for one-plane or two-plane balancing of shafts and parts (impellers, pulleys, disks, etc.) without shaft journals. In relation to our case of shaft balancing, cutting tools and cartridges are also balanced on these machines.
The shaft balancing procedure takes only a few minutes and includes:
- Input of geometrical parameters of the balanced shaft;
- Starting the balance shaft into rotation and taking automatically calculated data on the size and installation angle of the corrective mass.
- Installation / removal of the corrective mass.
We note in particular that high speed and measurement accuracy is achieved through the use of the BALTECH-Balance program, the standard functionality of which allows multi-plane (up to 4 planes) and multi-point (up to 16 points) balancing with vibration amplitude and phase measuring instruments of any manufacturer.
To get deep theoretical knowledge and professionally master the skills of working with balancing machines and devices "BALTECH", we recommend that you sign up for the next Course TOR-102 "Dynamic balancing" in training center company BALTECH.
Balancing cardan shaft can be carried out both with your own hands and at the service station. In the first case, this requires the use special tools and materials - weights and collars. However, it is better to entrust the balancing to the service station workers, since manually it is impossible to accurately calculate the weight of the balancer and its installation location. There are several “folk” balancing methods, which we will discuss later.
Signs and causes of imbalance
The main sign of the occurrence of an imbalance in the cardan shaft of a car is appearance of vibration the entire body of the machine. At the same time, it increases as the speed of movement increases, and, depending on the degree of imbalance, it can manifest itself both already at a speed of 60-70 km / h, and more than 100 kilometers per hour. This is a consequence of the fact that when the shaft rotates, its center of gravity shifts, and the resulting centrifugal force as if "throws" the car on the road. Additional sign in addition to vibration is the appearance characteristic hum emanating from under the bottom of the car.
Unbalance is very harmful to the transmission and chassis of the car. Therefore, when its slightest signs appear, it is necessary to balance the “cardan” on the machine.
Neglect of breakdown can lead to such consequences.
There are several reasons for this breakdown. Among them:
- normal wear and tear parts for long-term operation;
- mechanical deformations caused by impacts or excessive loads;
- manufacturing defects;
- large gaps between separate elements shaft (in case it is not solid).
The vibration felt in the cabin may not come from the driveshaft, but from unbalanced wheels.
Regardless of the cause, when the symptoms described above appear, it is necessary to check for imbalance. Repair work can also be done in your own garage.
How to balance the gimbal at home
Let's describe the process of balancing the cardan shaft with our own hands using the well-known "grandfather" method. It is not difficult, but it can take quite a while to complete. a lot of time. You will definitely need viewing hole, on which you must first drive the car. You will also need some weights. different masses used in wheel balancing. Alternatively, instead of weights, you can use electrodes cut into pieces from welding.
Primitive weight for balancing the cardan at home
The algorithm of work will be as follows:
- The length of the cardan shaft is conditionally divided into 4 equal parts in the transverse plane (there may be more parts, it all depends on the amplitude of the vibrations and the desire of the car owner to spend a lot of time and effort on this).
- To the surface of the first part of the cardan shaft securely, but with the possibility of further dismantling, attach the aforementioned weight. To do this, you can use a metal clamp, plastic tie, tape or other similar device. Instead of a weight, you can use electrodes, which can be placed under the clamp several pieces at once. As the mass decreases, their number is reduced (or vice versa, with an increase, they are added).
- Next is testing. To do this, go by car to flat road and analyze whether the vibration has decreased.
- If nothing has changed, you need to return to the garage and re-weigh the load to the next segment of the cardan shaft. Then repeat testing.
Mounting the weight on the cardan
Items 2, 3 and 4 from the above list must be followed until you find on cardan shaft the area where the weight reduces vibration. Further, similarly empirically, it is necessary to determine the mass of the weight. Ideally, with the right choice vibration should be gone. at all.
The final balancing of the “cardan” with your own hands consists in rigidly fixing the selected weight. For this, it is desirable to use electric welding. If you don’t have it, then in extreme cases you can use a popular tool called “cold welding”, or tighten it well with a metal clamp (for example, plumbing).
Balancing the cardan shaft at home
There is another, albeit less effective method diagnostics. In accordance with it, it is necessary dismantle the propeller shaft from the car. After that, you need to find or pick up a flat surface (preferably perfectly horizontal). Two steel corners or channels are placed on it (their size is unimportant) at a distance slightly less than the length of the cardan shaft.
After that, the "cardan" itself is laid on them. If it is bent or deformed, then its center of gravity is shifted. Accordingly, in this case, it will scroll and become in such a way that its heavier part will be at the bottom. This will be a clear indication to the car owner in which plane it is necessary to look for imbalance. Further actions similar to the previous method. That is, weights are attached to the cardan shaft and the places of their attachment and mass are calculated empirically. Naturally, the weights are attached on the opposite side from the one where the center of gravity of the shaft is shifted.
Another effective method is to use a frequency analyzer. It can be made by hand. However, a program is needed that imitates an electronic oscilloscope on a PC, showing the level of the frequency of oscillations that occur during the rotation of the gimbal. You can say it from the Internet in the public domain.
So, to measure sound vibrations, you need a sensitive microphone in mechanical protection(foam rubber). If it is not there, then you can make a device from a speaker of medium diameter and a metal rod that will transmit sound vibrations (waves) to it. To do this, a nut is welded into the center of the speaker, into which a metal rod is inserted. A wire with a plug is soldered to the speaker outputs, which is connected to the microphone input in the PC.
- The drive axle of the car is hung out, allowing the wheels to rotate freely.
- The driver of the car "accelerates" it to the speed at which vibration usually occurs (usually 60 ... 80 km / h, and gives a signal to the person who takes the measurements.
- If you are using a sensitive microphone, then bring it close enough to the place of marking. If you have a speaker with a metal probe, then you must first fix it to a place as close as possible to the applied marks. The result is fixed.
- Conditional four marks are applied to the cardan shaft around the circumference, every 90 degrees, and numbered.
- A test weight (weighing 10 ... 30 grams) is attached to one of the marks using a tape or clamp. Also can be used directly bolted connection clamp like a weight.
- Next, measurements are taken with a weight at each of the four places in sequence with numbering. That is, four measurements with the movement of cargo. The results of the oscillation amplitude are recorded on paper or computer.
Location of imbalance
The result of the experiments will be the numerical values of the voltage on the oscilloscope, which differ from each other in magnitude. Next, you need to build a scheme on a conditional scale that would correspond to numerical values. A circle is drawn with four directions corresponding to the location of the load. From the center along these axes, segments are plotted on a conditional scale according to the data obtained. Then you should graphically divide segments 1-3 and 2-4 in half by segments perpendicular to them. A ray is drawn from the middle of the circle through the intersection point of the last segments to the intersection with the circle. This will be the unbalance location point that needs to be compensated (see figure).
The desired point for the location of the compensation weight will be at the diametrically opposite end. As for the mass of the weight, it is calculated by the formula:
- unbalance mass - the desired value of the mass of the established imbalance;
- vibration level without test weight - voltage value according to the oscilloscope, measured before installing the test weight on the gimbal;
- the average value of the vibration level - the arithmetic average between four voltage measurements on the oscilloscope when installing a test load at four indicated points on the gimbal;
- the value of the mass of the test load - the value of the mass of the established experimental load, in grams;
- 1.1 - correction factor.
Usually, the mass of the established imbalance is 10 ... 30 grams. If for some reason you did not manage to accurately calculate the imbalance mass, you can set it experimentally. The main thing is to know the installation location, and adjust the mass value during the ride.
However, as practice shows, independent balancing of the cardan shaft by the method described above only partially eliminates the problem. The car can still be driven for a long time without significant vibrations. But it will not be possible to completely get rid of it. Therefore, other parts of the transmission and chassis will work with it. And this negatively affects their performance and resource. Therefore, even after self-balancing, you need to contact the service station with this problem.
Technological repair method
Cardan Balancing Machine
But if for such a case you don’t feel sorry for 5 thousand rubles, this is exactly the price of balancing the shaft in the workshop, then we recommend going to the specialists. Performing diagnostics in repair shops involves the use of a special stand for dynamic balancing. To do this, the cardan shaft is dismantled from the machine and installed on it. The device includes several sensors and so-called control surfaces. If the shaft is unbalanced, then during rotation it will touch the mentioned elements with its surface. This is how the geometry and its curvature are analyzed. All information is displayed on the monitor.
Performance repair work can be done in various ways:
- Installation of balancer plates directly on the surface of the cardan shaft. At the same time, their mass and installation location are accurately calculated computer program. And they are fastened with the help of factory welding.
- Balancing the cardan shaft on a lathe. This method is used in case significant damage element geometry. Indeed, in this case, it is often necessary to remove a certain layer of metal, which inevitably leads to a decrease in the strength of the shaft and an increase in the load on it in normal operation modes.
Similar balancing machine cardan shafts it will not work with your own hands, because it is very complicated. However, without its use, high-quality and reliable balancing cannot be performed.
Results
It is quite possible to balance the cardan yourself at home. However, it must be understood that it is impossible to choose the ideal mass of the counterweight and the place of its installation on your own. That's why self repair possible only in the case of minor vibrations or as a temporary method of getting rid of them. Ideally, you need to go to a service station, where they will balance the cardan on a special machine.
For an ideally balanced motor, the axis of inertia of the rotor must coincide with the axis of rotation. But quite often during the operation of the unit there is an imbalance, there are extraneous noise and increased vibration. These signs indicate the need for a balancing procedure for the electric motor.
The motor rotor is a complex structure consisting of several elements. Each of them is endowed with its density, probable microdefects and various deviations. All this can cause an imbalance, the value of which can reach critical indicators. Then the balancing of the electric motor becomes the only condition for extending the life of the unit.
The motor rotor or armature can be balanced in two ways:
in dynamic mode
in static mode.
The inertial forces arising during the rotation of the rotor and the inertial moments of forces caused by the unbalance depend on the angular velocity. Based on this, for electric motors with quiet running, balancing is used in a static mode, and high-speed units are balanced in a dynamic mode.
Static balancing has several disadvantages, including: the duration of the procedure, a large number of measurements and calculations. But the main disadvantage of balancing the electric motor in static mode is the insufficiently accurate reduction of the unbalance index.
But professionals know how to perform balancing with maximum accuracy, therefore, if the need arises for such a procedure, it is recommended to contact experienced specialists in their field.
Our company carries out high-quality balancing of any types of electric motors. We provide services for reasonable prices and in the shortest possible time. Call our phone number listed on the site, we will be happy to help you!
Our capabilities
Dynamic balancing of vertical and horizontal rotors and shafts
Balancing in own supports at the Customer's enterprise
Balancing on machines
Diagnosing the causes preventing balancing
Identification of the causes of equipment failure
Result of equipment balancing
Reduction of vibration and increased loads
Longer service life of bearings, couplings and seals
Probability reduction emergency exit equipment out of order
Reducing electricity consumption
After balancing, all results are drawn up in the form of a balancing protocol, reflecting the name of the equipment, accuracy class, geometric parameters, tolerance field, as well as the initial and final level of unbalance.
Balancing steps
Initial vibration measurement
Installing a test weight with a known mass
Re-measurement of vibration
Calculation of the corrective weight and the angle to the installation Installation of the weight on the rotor (or metal removal)
New vibration measurement before the result is achieved
Our Balancing Videos:
During operation electric motors, rotating parts, in particular the shaft, can receive various defects and damage. This may be a defect in the shaft neck or its curvature, the shaft may “sag” if the rotor plates are overtightened and some other damage.
After carrying out any repairs on electrical machines, in without fail shafts are balanced. This procedure can be carried out in static or dynamic mode. For low-speed machines, static balancing is usually performed, and on units with high rate stroke - dynamic balancing.
For balancing, special machines are used in which the motor shaft is placed. The work is quite time-consuming and responsible, so it is unlikely that it will be possible to perform it independently. It is better to entrust this task to professionals who have sufficient experience and skill in carrying out the procedure.
For static balancing, a special machine with prisms mounted on a support structure is used. The shaft is laid on the working surfaces of the prisms, then the location of the load is determined at one end of the part for balancing. This eliminates static imbalance. After that, the shaft is balanced according to the established rules.
During dynamic balancing, balancing weights are installed on two ends of the shaft. High-speed shafts have their own runout at each end, which is caused by imbalance. Next, the master performs balancing to the maximum decrease in the imbalance.
Our company performs services for balancing the shafts of electric motors of any type. We do quality work, quickly and inexpensively! Call our specialists if you need to perform balancing, they will be happy to answer all your questions!
Motor ventilation balancing
Dynamic balancing of the motor ventilation system is one of the many operations performed to further uninterrupted operation rotating mechanism. Such balancing is carried out either on special balancing machines or on the engine's own mounts.
Why is ventilation balancing done?
All rotating mechanisms, as well as their elements separately, are subject to balancing. In case of poor-quality balancing, the engine may begin to vibrate, make noise, lose power, increase electricity or fuel consumption. This leads to failure of individual parts of the electric motor or its entirety.
When an asymmetry occurs in a rotating system (shift of the axis of rotation) or, in other words, an imbalance, troubles immediately arise due to an increase in vibration. The higher the rotation speed, the more pronounced the manifestations of imbalance become.
The service - "balancing the ventilation system", is provided by our company! In our state only highly qualified specialists are able to perform this task quickly and efficiently.
If you want to pay as little as possible for the repair of electric motors, then you must follow the operating rules for these devices:
* Balance motor ventilation must be done in a timely manner;
* Constantly monitor the health of the equipment;
* The electric motor must be operated with parameters corresponding to the technical passport of the unit;
* Increased vibration phenomena lead to additional loads on the entire engine or its individual parts.
If you need balancing of the ventilation system of the electric motor, then dial the phone number listed on our website. We will fulfill this work qualitatively and on time, and the engine after balancing the ventilation will work properly for many years!
Balancing of rotating parts
Our organization is engaged in dynamic balancing of ventilation systems, motor anchors, pulleys, shafts, impellers and other rotating parts both on their supports and on balancing machines.
What is balancing for?
Balancing is a native word for both a car and any other equipment with rotating parts. All rotating parts are subjected to this operation. Flywheel, crankshaft, clutch, cardan shafts, wheels, pulleys, fans, etc. Do not list everything. And it’s worth cheating here, as the imbalance will immediately declare itself with soul-exhausting shaking, vibrations, noises, rapid wear bearings, power loss, increased power consumption or fuel consumption, etc.. Which leads to premature wear and breakage of other parts, and in some cases, of the entire equipment.
An imbalance occurs if the rotating system is even slightly asymmetric. It is worth slightly shifting the axis of rotation from the center of the part or making this part even a fraction of a millimeter non-circular (or simply non-uniform in density) - an imbalance with its companions shaking, vibrations and wear is right there. It manifests itself, however, with an increase in the rotation speed. For example: at a speed of 100 km / h and an imbalance of 15-20 g on a 14-inch wheel, the load on the disk will be similar to hitting it with a three-kilogram hammer with a frequency of 800 times per minute.
And so the conclusion!
1. If you want to pay less and less often for repairs, follow the rules of operation industrial equipment. Get your balance right.
2. The equipment must be in good working order, and the parameters of its operation must comply technical data sheets. Rotating machine components (shafts, pulleys, fans, etc.) must be balanced as in the form individual parts, as well as in the collection.
3. Vibration of parts causes additional loads on the part itself and on the parts associated with it.
GOST 12.2.003-91 SSBT. Production equipment. General requirements security
1.1. Production equipment should ensure the safety of workers during installation (dismantling), commissioning and operation, both in the case of autonomous use and as part of technological complexes, subject to the requirements (conditions, rules) provided for by the operational documentation.
Note. Operation includes general case intended use, Maintenance and repair, transportation and storage.
2.1.2. The design of production equipment must exclude, in all intended modes of operation, loads on parts and assembly units that can cause damage that poses a danger to workers.
2.1.11. The design of production equipment powered by electrical energy must include devices (means) to ensure electrical safety.
2.1.13. Production equipment that is a source of noise, ultrasound and vibration must be designed so that noise, ultrasound and vibration in stipulated conditions and operating modes did not exceed the permissible levels established by the standards.
Unfortunately, balancing issues crankshaft(flywheel, clutch basket, damper) are practically not disclosed in the available literature, and if anything can be found, then these are GOSTs and scientific literature. However, understanding and understanding what is written there requires some preparation and the presence of the balancing machine itself. This, of course, discourages auto mechanics from all desire to deal with these issues from the point of view of ICE repair. In this short article, we will try to cover the issues of balancing from the position of an auto mechanic, without going into complex mathematical calculations and focusing more on practical experience.
So the most frequently asked question arising during engine repair: is it necessary to carry out balancing after grinding the crankshaft?
To do this, we will show all the stages of balancing the crankshaft, which are performed in our company when repairing the crankshaft. As an example, take the crankshaft of the MV 603.973 engine. This is an inline 6 cylinder diesel engine. The permissible unbalance of the manufacturer for this shaft is 100 gmm. Is it a lot or a little? What happens if the imbalance is less or more than this figure? We will not consider these issues in this article, but will describe them later. But we can say with confidence that the manufacturer does not take these figures from the ceiling, but spends enough experiments to find a compromise between valid value imbalance for normal operation engine and production cost to ensure this tolerance. Just for comparison, the manufacturer's allowable unbalance on the crankshaft ZMZ engine 406 360 hmm. To make it easier to imagine and understand these numbers, let's recall a simple formula from a physics course. For rotational motion, the inertia force is:
m– unbalanced mass, kg;
r is the radius of its rotation, m;
w – angular velocity rotation, rad/s;
n– rotation frequency, rpm.
So, we substitute the numbers into the formula and take the speed from 1000 to 10,000 rpm, we get the following:
F1000 \u003d 0.1x 0.001x (3.14x1000 / 30) 2 \u003d 1.1 N
F2000 \u003d 0.1x 0.001x (3.14x2000 / 30) 2 \u003d 4.4 N
F3000 \u003d 0.1x 0.001x (3.14x3000 / 30) 2 \u003d 9.9 N
F4000 \u003d 0.1x 0.001x (3.14x4000 / 30) 2 \u003d 17.55 N
F5000 \u003d 0.1x 0.001x (3.14x5000 / 30) 2 \u003d 27.4 N
F6000 \u003d 0.1x 0.001x (3.14x6000 / 30) 2 \u003d 39.5 N
F7000 \u003d 0.1x 0.001x (3.14x7000 / 30) 2 \u003d 53.8 N
F8000 \u003d 0.1x 0.001x (3.14x8000 / 30) 2 \u003d 70.2 N
F9000 \u003d 0.1x 0.001x (3.14x9000 / 30) 2 \u003d 88.9 N
F10000 \u003d 0.1x 0.001x (3.14x10000 / 30) 2 \u003d 109.7 N
Of course, everyone understands that this motor will never reach a speed of 10,000 rpm, but this simple calculation is made in order to “feel” the numbers and understand how important balancing is when increasing the speed. What preliminary conclusions can be drawn? Firstly, you "felt" what an imbalance of 100 gmm is, and, secondly, you were convinced that this is really a tight enough tolerance for this engine, and there is no need to tighten this tolerance.
Now let's do away with the numbers and finally get back to this shaft. This shaft was pre-polished and then came to us for balancing. And here are the results we got when measuring the imbalance.
What do these numbers mean? In this figure, we see that the imbalance on the left plane is 378 gmm, and the imbalance on the right plane is 301 gmm. That is, it can be conditionally assumed that the total imbalance on the shaft is 679 gmm, which is almost 7 times higher than the tolerance laid down by the manufacturer.
Here is a photo of this shaft on the machine:
Now, of course, you will begin to blame the "crooked" grinder or a bad machine for everything. But let's go back to simple calculations and try to understand why this happens. For ease of calculation, we will take the weight of the shaft as 20 kg (this weight is very close to the truth for a 6-cylinder crankshaft). The shaft has a residual imbalance of 0 hmm (which is a complete utopia).
And so now the grinder has polished this shaft to the repair size. But when installing the shaft, he shifted the axis of rotation from the axis of inertia by only 0.01 mm (to make it easier to understand - the grinder did not match the old and new axis of rotation by only 0.01 mm), and we immediately got an imbalance of 200 gmm. And if you consider that the factory shaft always has an imbalance, then the picture will be even worse. Therefore, the numbers that we received are not out of the ordinary, but are the norm after grinding the shaft.
And if we consider that the manufacturer does not always maintain its own tolerances, then the accusations against the grinder or the machine simply disappear. Just do not now stand above the grinder and demand that he expose the shaft with micron accuracy, anyway it will not bring the desired result. The only correct way out of this situation is the mandatory balancing of the crankshaft after grinding it. Traditionally, balancing the crankshaft is performed by drilling a counterweight (sometimes it is true that you have to make the counterweights heavier, but this is a rather rare case).
Residual imbalance on the left plane is 7 gmm and 4 gmm on the right plane. That is, the total imbalance on the shaft is 11 hmm. Such accuracy was made specifically to show the capabilities of this machine and, as you understand now, there is no need to fulfill such requirements when balancing after grinding the shaft. The manufacturer's requirements are sufficient. So, we have finished with the shaft, and, naturally, the question arises whether it is necessary to balance the front damper (pulley), flywheel, clutch basket. Let us turn again to the repair literature. What does the same ZMZ recommend, for example, for the allowable imbalance of these parts? On the front pulley with a damper 100 gmm, on the flywheel 150 gmm, on the clutch basket 100 gmm. But there is a very important note.
All these parts are balanced separately from the shaft (that is, on mandrels), and the crankshaft assembly is not balanced in series at modern engine-building plants. That is, you understand that when installing the above parts on the crankshaft, the residual imbalance will naturally change, since the coincidence of the axes of rotation is almost impossible. Below are photos of balancing these parts.
Again, as practice has shown, these parts make a significant contribution to the imbalance of the crankshaft, and, as our experience has shown, the imbalance of each of these parts significantly exceeds the tolerances for residual imbalance. So, the figure 150-300 gmm is the "norm" for the front pulley (damper), for the flywheel 200-500 gmm, and 200-700 gmm for the clutch basket. And this applies not only to Russian car industry. As our experience has shown, approximately the same figures are obtained from the foreign auto industry.
And there is definitely another very important point: after balancing the parts individually, it is necessary to balance the assembly, but it should be done at the last stage. Pre-balancing individually is also mandatory. This is necessary so that in case the flywheel or clutch fails, you do not have to remove the knee for re-balancing.
So, here is what we finally get when balancing the assembly.
The final unbalance of the crankshaft assembly is 37 gmm.
It should be noted that the weight of the shaft assembly was about 43 kg.
But, after balancing the crankshaft assembly, do not forget about the weight distribution of pistons and connecting rods. Moreover, the weight distribution of the connecting rods must be done not just by weight, but by the center of mass, since the difference in the weight of these parts also contributes to the imbalance of the engine and is strictly regulated by the manufacturer.
And here's what I would like to note in conclusion: many auto mechanics, after reading this article, will say that this is all nonsense. That they have assembled dozens of motors, and that all of them work fine without balancing, and they will be right - they really work. But let's remember how many motors have been seen that worked .... with broken guides, with worn camshaft cams, with milled cylinder head plane above the norm by 2-3 times, with worn cylinders of 0.3 mm, with incorrectly installed pistons - this list can be continued indefinitely.
Everyone probably has a couple of their own examples when the engine worked contrary to all laws. Why honing cylinders, because before they only sharpened and everything worked? or: Why use hon-bruski when you can apply a grid with ordinary sandpaper? Why "catch" these hundreds, because it already works? So why, following one manufacturer's requirements, neglect others? Just don’t think that by balancing the crankshaft assembly and weighing the pistons and connecting rods, you will get a “miracle” that your regular engine from VAZ will become, according to its characteristics, like the engine from a Formula 1 car. This will not happen to you the same . After all, balancing is one of the bricks, which, together with the fulfillment of other repair requirements, gives you confidence that the engine you have repaired will work out at least the resource of a new engine. And the more motorists follow the requirements of automakers when repairing an engine, the fewer motorists will be who believe that the engine after overhaul more than 50-70 thousand km does not work.
