Why do special technological holes make in pulleys? In the auto repair shop for fixing the shaft there is a special device, which should be tied to the pulley with bolts and stall shaft.

If there are no special devices for fixing the shaft that is screwed to the pulley, then you need to put good anti-digit devices for the wheels of the car and put 4 transmission to the checkpoint.

Or, the third option - to get a moth in the teeth of the flywheel and fix the crankshaft from turning while unscrewing the pulley nut.

Another option, insert the pin in the pulley hole, and install the mount on the pin and the second stop, as in this picture.

How to unscrew the crankshaft pulley

Depending on the design of the crankshaft, the pulley is attached to it or a nut, or a bolt. On vehicles with rear-wheel drive, mostly pulley attached nut.
The engines of some rear-wheel drive cars can be started with a special handle for which special protrusions are made to engage the handle. This handle is also called the "curve key", and the engagement for this key is called ratchet.

The pulley fastening nut is installed in size than 36 or 38 mm turnkey. Use the end key. The key is enhanced by welding the long handle or put on the handset to increase the "shoulder".

How to unscrew the pulley nut:

1. Put cars on a pit or aleak.
2. Raise manual parking brake.
3. Include 4 speed on the checkpoint, put the stops under the wheels.
4. Do not stick to the edges of the nut.
5. Throw the end key, lengthen its pipe and disrupt the baked nut.

If the pulley nut is unscrewed:

1. Transfer the handle of the box on the neutral.
2. Throw off the candle wires with the candle so that the motor does not start.
3. Put the end key on the nut and lengthen its pipe. Throw the key in such a way that the pipe rested into the ground or the spar of the machine on the right side to exclude the rotation of the pulley clockwise.
4. We make a couple of short sharp turns of the ignition lock key to turn on the starter. Starter will start rotating the flywheel, the handwheel crankshaft, and the pulley is fixed with the key. In this case, usually an accurate nut quickly "leaves."

The crankshaft pulley with front-wheel drive is mainly fastened by a bolt. To remove the pulley of the crankshaft of the front-wheel drive car, you need to act in this order:

1. Domkrat raise the front right side of the car. Laying the goselves, pecks or a pair of wheels with disks.
2. Remove the wheel.
3. Dismantle and remove the air filter with the case.
4. Remove the protective casing.
5. Loosen the belt tensioner and remove the generator belt.
6. To fix the crankshaft, it is necessary to remove the cap in the clutch crankcase, after which insert the mount into the hole and overtake it between the flywheel's teeth.
7. Now you have to put the end key, lengthen it with a pipe and try to try sharply counterclockwise. The main rip off the accurate pulley bolt.

If it does not work out from the place of the bolt, we use the revealing method by the starter. This method is above.

Useful advice from the locks who have been presented to a lot: to use a solvent or VD-40, or a similar means from the formation of Rust. After sprinkled on the thread (if the pulley is attached to the nut), it is necessary to wait minutes 15 minutes, then try to turn off. If the bolt, then on the threads to apply this tool is not easy, although around the bolt sprinkle, it is possible through microscopes a liquid will pass and the connection will take off.

Removing pulley

Unscrew the bolt or fastening nut - it is only a floor of the case. Next must be pulled out the pulley from the tree. So simply with the hands of the pulley, if not its landing socket does not break up. In addition, the pulley is tightly placed on the shaft, it is still fixed from the sponge sponge.

There are special pullers to remove pulleys from the shaft. There are mechanical and hydraulic pullers.

The design of the mechanical puller is simple. Usually, there are three legs that need to hook the pulley itself, and the central rod rest in the shaft. After that, you need to rotate the rod, the paws will straighten and pull the pulley. There are pullers even easier, which can be made with their own hands.
If there is no removable pulley device, you can use mounts. If one person takes off, then in turn, on each side, moving on a little bit, so that there is no skew. If two, then at the same time with different sides, the pulley from the crankshaft is pressed by a sharp movement.

It also happens that when using the puller, the walls of the pulley groove are not maintained and numbered. Therefore, when using mounts, it should be engaged as close as possible to the shaft.

Installing pulley on crankshaft

In order to quickly install the pulley on the crankshaft, you need to check the seats. If there are burrs, jackets, remove their sandpaper. If the old pulley is easily sisted on the shaft, then such a pulley is not suitable. He must sit tightly, sit down with a certain effort. Before installing the pulley, to reduce friction, it is necessary to lubricate with oil or lithol.

Video

In this video, useful tips, how to unscrew the pulley mounting nut to the crankshaft of the automotive motor.

An option to unscrew the crankshaft pulley bolt with a polyclinite belt.

How to remove the crankshaft pulley on the VAZ (2108, 2109, 21099, 2110, 2111, 2112, 2113, 2114, 2115).

How to Remove The Crankshaft Pulley Bolt. Bolted connection.

How to tighten the crankshaft pulley very quickly.

Removes the crankshaft pulley by Honda (Honda) without a key special.

TO Manager:

Fixer-mechanic board

Flexible transfer and assembly of pulleys

The belt transmissions are divided into two main groups: transfers with flat belts and transmission by wedge-shaped belts. The plane transmissions are also divided into two groups: ordinary transmissions and transmissions with a tensioning device.

Ordinary transmissions are divided into three types: open, cross and semi-precious. Open transmission is used for parallel shafts. The parallel location of the shafts is the easiest and most convenient for the belt device and favorable for the belt. For each of the shafts, the pulley is worn through which the belt is thrown. In this case, both pulleys rotate in one direction.

If the direction of rotation of the pulley coincides with the direction of movement of the clockwise, they say that the pulley rotates clockwise, if it does not coincide, the pulley rotates counterclockwise.

In each pair of pulleys associated with belt transmission, leading and slave pullees are distinguished. The pulley, receiving movement from his shaft and transmitting his belt, is called the leading, and the driving movement from the belt and the shaft transmitting it - the slave.

In fig. 1, and shows an open belt transmission. The pulley oh is the leading. The arrow in the figure indicates that it rotates clockwise. The slave pulley 02 will also rotate clockwise.

If you need to get the rotation of the slave pulley to the side opposite to the rotation of the driving pulley, then enjoy the cross-transmission (Fig. 1, b). In this case, the presenter pulley 01 rotates clockwise, and the slave 02 will rotate counterclockwise. Shafts are parallel to each other.

If the shafts are located perpendicular to each other, then semi-sessive gear is used (Fig. 1, B).

Fig. 1. Types of belt gears: a - open, b - cross, in - semi-session, g - cross-section of a wedge-shaped belt, D - rotation transmission circuit, C - cross-section of a polyclinovoid belt

In the actuators of the machines, flat belts are leather, cotton wholecraft, cotton shied, woven and rubberized and wedges. In the machines are mainly used leather, rubberized and wedge-shaped. In fig. 1, g shows the section of a wedge-shaped belt: it consists of several rows of rubberized fabric, several rows of cord (thick twisted cotton threads), a layer of rubber and wrapper from rubberized tissue.

In fig. 1, D is a clinorem transmission. Each of the belts laid in the "His" groove on the rim pulley. At the same time, the belt is comfortable in the groove so much that does not concern its bottom with its lower surface.

Polyclinovoid belts were distributed. 1, e. These are endless flat belts, on the inner surface of which there are wedge protrusions made in the form of wedge-shaped belts (number from 2 to 36). These protrusions are included in the appropriate pulley depressions.

The main disadvantage of the belt is the slip of the belt depending on the belt tension and the magnitude of the arc on which the belt covers the pulleys. With different diameters of pulleys in the worst position there is a smaller pulley, which has a small belt coverage.

To increase the belt tension and the amount of coverage in smaller pulleys, stretch rollers are used (Fig. 2, a). The diameter of the tension roller is taken equal to 0.8 - 1.0 diameter of a small pulley. It is located on the slave branch at the small pulley. Due to the severity of the roller, and if necessary, and additional cargo or spring, constant belt tension is carried out. It provides a large angle of the pulley belt coverage, improves the conditions of the transmission, allows you to reduce the mid-scene distance.

In all types of belt gears, a tension shaft is used. The belt tension is performed periodically by moving one of the shafts (Fig. 2, B, B).

Belt Tension Methods:
- The electric motor with a small pulley is mounted on a salazzo and can navigate them. Tension is performed by screw; With a swinging plate. The stove is fastened to be hinged, its position is fixed with a screw. The tension is carried out due to the gravity of the engine and the stove; Using cargo. The load pulls one of the shafts and provides automatic tension control.

Fig. 2. Methods for tensioning belt gears: a - tensioner roller, b - sleds with an installed engine, in - Sylon of gravity of the electric motor installed on the swing plate

The first two ways are used in all types of technological equipment for any belt gear. Flat belts after hoods are shortened with subsequent stitching and gluing.

Assembling pulleys. Pulleys are usually made of cast iron or steel. They are performed or with spokes, or with a solid disk, in which holes can be made to reduce pullea mass. Pulleys can be solid and split. At the location of the pulley at the end of the shaft, one-piece pulleys are used, and the location between the bearings is detachable.

Pulleys are single-stage and multistage. There are several steps of different diameters on a multistage pulley.

Pulleys for clinorem transmission in design differ from smooth pulleys only by the presence of prismatic grooves on the rim.

Workers are permanent pulleys mounted on the shaft with a tight or intense landing. If the pulley is installed on a cervical bearing protruding from the bearing, it may be conical (Fig. 3, a) or cylindrical (Fig. 3, b) with a prismatic or wedge knap. The cylindrical shaft with a prismatic key makes a bin (Fig. 3, c) to fix the position of the pulley, and so that the pulley does not move during operation, it is additionally attached to the nut (Fig. 3, d). If the pulley is attached by a wedge knap (Fig. 3, c), then no additional attachment is required.

The pulley installation on a wedge key is applied only in low-kind and irrelevant transmissions, when it does not require an accurate fit, since the wedge knock shifts the axis of the hub, and with a small length it appears, which is unacceptable in high-speed heavy loaded transmissions. When using a prismatic key, the remnant of the pulley hub axis is significantly less and such compounds are more accurate.

If high accuracy is required, slotted connections are used - (Fig. 3, d). With this form, the plug connection is centered better than on the keys, the strength increases and the landing site is less.

Fig. 3. Schemes for assembling pulleys on the shafts: a - at the conic end of the shaft, b - on the cylindrical end of the shaft with a key with a key, in - Installing pulley with a wedge knocker fixing, g - landing pulley on a slotted shaft; 1 - shaft, 2 - swing, 3 - locking screw

For planting pulley, screw devices are used for shaft, such as tie brackets. The detachable clamp (Fig. 4) is put on the shaft and rest in his bin. Then the thrust passes between the spokes of the pulley, and to the end of the hub of the pulley under-put the bar into which the screw rests. Turning the screw and hitting a slightly through the lining in different places along the outer surface of the hub, gradually the pulley on the shaft is gradually. Strokes eliminate the plot of pulley on the shaft due to possible distortions.

Deligative pulleys can be installed anywhere on the length of the shaft. The assembly of the pulley is to connect the two halves with studs. Checking the correctness of the landing of pulleys on the shaft comes down to testing.

The pulleys' beating causes rapid wear of bearings, and the gears of accurate high-speed metal-cutting machines contribute to the increase in vibrations that increase the surface roughness of the processed parts. The causes of the pulleys are: a bending of the shaft, incorrect mechanical processing of pulleys and improper landing to the shaft when assembling.

Fig. 4. Scheme of landing pulley using a coupling bracket A - on beating, b - mutual parallelism of shafts with a cord with weights, in - metal line, r - cord; I - arrows, 2 - weight, 3 - pulleys

Fig. 5. Schemes for checking the assembled pulley:

Pulleys beating are checked by raysmas-hell or indicator. When checking the test indicator, the countdown is conducted on the dial. ADICATOR (Fig. 5, a), and when checking the pulp, the value of the beyon is determined by the dipstick.

Check two parallel shaft using the arrows and a plumb (Fig. 5,6). At the ends of the shafts, the arrows are strengthened, the ends of which come into contact with the cord. When turning the shafts 180 ° arrows must come back again with the cord. Verification is also performed using a ruler - Fig. 5, in, with a cord - Fig. 5, g (when tightening the cord between the rims of pulleys and the cord, there must be the same gap).

After checking on the beat, the belt is put on. For this pulleys rotate manually. First, the belt is put on the lead pulley, then on the slave. For wear, enjoy hooks or tips.

Any modern internal combustion engine has additional equipment: generators, pumps, compressors, cooling system pump. To work all these mechanisms, it is necessary to transfer torque from the crankshaft to the engine equipment. For this, car manufacturers use belt transmissions. From the sock side of the crankshaft (from the front of the engine), pulley is installed or several pulleys. A response pulleys of the units and engine units are attached to the engine block, the rotation of which is provided by the belt transmission. The crankshaft pulley is fastened with a sponge compound, fixed by a bolt or nut.

Constructively pulley is a flat wheel with a special channel on the end surface where the belt is stacked. Under the condition of sufficient stretch of the belt enters the adhesion with the pulley, and the belt transmission begins to work. Similar pulleys made of steel, aluminum, cast iron.

Types and features of pulleys

The pulleys differ in the form of a section, the number of "streams" on it. Consider the main models of pulleys.

• Pulley under the wedge belt. The working surface of such a pulley has the standard shape of the deep groove with flat surfaces, which repeats the belt shape. Such a pulley can have two or more working streams, that is, several pulleys can be combined into one;
• Pulley under the polyclinic belt. On one flat surface of such a pulley there are several small streams - ribs in a row. This section is repeated on the belt. The effectiveness of such gear is higher, as the plane of the contact of the working surfaces is greater;
• Pulley under the toothed belt. Such a pulley has a cross tooth, similar to the gear teeth. The same section has a belt. In the work of the belt teeth, engage with pulley, the transmission works;
• Crankshaft pulley with damper. Torque, let's say during the start of the engine or braking by the engine, can sharply increase or fall. To reduce the pulse load on the crankshaft pulley, use pulleys with an exterior. The principle of operation in the following: Between the base and working part of the pulley, the damping inset is provided, the rigidity of which allows the belt transmission to work and compensates for sharp crankshaft pulses.

Pulleys malfunctions and checking their status

The pulley and belt transmissions operate due to the friction force between the contact surfaces, so the common cause to replace the pulley is the production plane. From the dynamic loads, the metal pulleys cracks, it is cleaned.

Another typical disease for such details is the backlash backlats in the crankshaft sponge groove. The reason for this wear of the landing planes with a shaft. The pulley fastener with such a malfunction from vibrations is gradually unscrewed, increasingly increasing the backlash.

The long-term work of the crankshaft with the "luft" pulley will lead to the development and damage to the sponge groove, unscrew the crankshaft pullea. Further, the entire assembly turns on the landing location, destroying the keyboard, the pulley case and the crankshaft itself. If the crankshaft pulley threw on your motor, the probability is high, the entire crankshaft shall be replaced.

In order to determine the condition of the crankshaft pulley, it is necessary:

1. remove the belts of the pulley, inspect its edges and the case for damage to cracks, wear;
2. step up the pulley, if there are critical nodes, the node must be disassembled, to examine on the subject of production and damage;
3. usually, the repair instructions are the dimensions of the allowable wear of parts, the distance to the nearest engine nodes. Checking such dimensions will help determine the suitability of pulleys to further operation.

How to remove the crankshaft pulley: replacement of pulley

Replacing the crankshaft pulley - the operation is simple. It is enough to study the design features of your engine, cook everything you need.

Consider the replacement of the crankshaft pulley, on the example of the car Renault Kangoo. To perform such a repair, it is necessary to immobilize the car, install it on jacks.

1. The car has an across the location of the engine, to access the pulley attachment, remove the left wheel;
2. Since the part in the work rotates, you must fix the pulley. To do this, use special locks. In the case of RENAULT engines in the cylinder block there is a special hole (closed by a bolt), where the BMT Mot retainer is inserted. 1489 In the shape of a threaded pin. It fixes the crankshaft;
3. To block the engine rotation you need:
   1. unscrew the bolt;
   2. install the locking pin.
4. Then we set the crankshaft to the repair position by checking it clockwise until it stops into the pin;
5. Weaken and remove the generator belt;
6. Then we unscrew the pulley fastener to the shaft sock and remove the pulley itself. Many people have a question: how to unscrew the crankshaft pulley bolt? From constant rotation, the bolt thread is very damaging, because of this, inexperienced car owners believe that the direction of thread left. However, the crankshaft pulley bolt has a conventional right thread and unscrewed counterclockwise;
7. Install a new pulley, tightening the pulley bolt must be performed with a torque control with a torque wrench (0.8 NM);
8. Remove the crankshaft lock, install a bolt plug;
9. Collect dismantled nodes and parts in order, reverse disassembly.

Replacing the pulley crankshaft

Whatever the car, sooner or later it will have to repair it. If your car, for example, deformed the crankshaft pulley, and you need to remove it, then for this you will have to put the "iron horse" on the parking brake, then with the help of a jack to raise the front part of the machine and install it on special backups so as not tolere From the jack.

Continuing the procedure started, remove the front wheel on the right side and dismantle the crankcase protection, if any. After that, it is necessary to remove the drive belt, which is usually intended for auxiliary units. Before dismantling it is sure to apply a small marking on the belt tape, which will indicate the direction of its rotation.

The next step will be a weakening of the bolt, with which the pulley is mounted for its complete locking from turning.

Such work is best done with the assistant, since it does not cope with this problem. Next, ask your assistant to include the highest transmission and simultaneously squeeze the brake pedal stop. In the case when the model with AT, release one of the hydrotransformer bolts and try to attach the drive disc to the dome of the transmission using a conventional steel strip and several bolts suitable for this.

When the motor is removed from the car, you need to lock the flywheel and drive disk. You should then turn the fastening bolt and remove the crankshaft pulley with the pin. After removing the pulley of the VAZ crankshaft, you must check the condition of the gland itself. If he is not working, then be sure to replace it.

So, for a start, it should be very careful to install the crankshaft pulley on the pin. In mandatory, make sure that the keyproof grooves on the key was correctly planted. Check the completeness of the pulley itself, without damaging the working edges of the gland. After that, screw the new bolt together with the washer planted on it.

Next, it should be blocked from the possibility of turning with the same method as when removing. After that, tighten the fastening bolt, applying the first stage for this, and reach it on the corners of the stages of two and three. You need to take advantage of this special intake nozzle. Alternatively, you can apply as paint tags or high-quality marker.

After the stages traveled the crankshaft pulley can be considered established. It remains to pull the drive belt itself, which is used for auxiliary aggregates, followed by observing its initial direction of rotation. Do not forget to install the crankcase protection, as well as screw the front right wheel, which you were filmed before starting work. Having lowered the car to Earth, that is, removing it before from the jack, do not forget to reach the fastening of the wheel, applying the required efforts for this. Good luck to you, as well as a pleasant and long ride on your car!

Assembling pulleys.

Depending on the design of the pulley, it can be located anywhere on the shaft or attached at its landing end, the plug-in pulleys are installed anywhere in the shaft and are collected without any difficulty. When tagging two halves of pulleys, you need to ensure that the plane of the pulley connector is combined without distortion, displacements and cracks. The pre-assembled pulley with a key groove is coming to the key, laid in the shaft groove, then tighten the nuts first at the hub, and then the rim.

Perfect pulleys More often located on the protruding from the bearing end of the shaft. This end is made by conical (Fig. 109, a) or cylindrical (Fig. 109, b), with a prismatic or wedge knap. The cylindrical shaft with a prismatic key has a bin to fix the position of the pulley. A washer is placed on the free end of the end of the shaft, which is attached by the screws screwed into the end of the shaft. In accurate compounds, the grooves of pulley and the knap are driven by a seasper. The key must be installed with light blows of the copper hammer or with the help of the clamp.

Fig. 109. Receptions of assembly of pulleys and checking mutual parallelism of shafts:

a - at the conic end of the shaft, b - on the cylindrical end of the shaft with a knap:

1 - shaft, 2 - swing, 3 - locking screw; In - landing pulley on a slotted shaft, G - checking the mutual parallelism of shafts with weights, d - check the metal line, e - check with the cord: 1 - arrow, 2 - pulley, 3 - weight

Centering pulleys by cone (See Fig. 109, a) gives the best density of the fitting hole of the hub to the shaft neck.

Landing pulleys on slotted shafts(Fig. 109, c) has a great advantage over the above way: it turns out the best centering, high strength and lesser wear of the pairing places.

After installing pulleys, the shaft check the correctness of the landing, which comes down to testing. Bilation is called oscillation of the outer surface of the part when it rotates around its axis. The value of the beyon of any point of the surface of the part is called the greatest swing of fluctuations in this point in one turn of the details.

The pulleys' beat causes rapid wear of bearings, and the transmissions of accurate high-speed metal-cutting machines contribute to the increase in vibrations, which worsens the purity of the surface of the parts being processed.

For the normal working belt, it is necessary that the average planes of both pulleys are combined, which is possible only with the mutual parallelism of the axes of the leading and slave pulleys (Fig. 109, G, D, E).

The assembly and verification of the pulleys of the clinorem transmission is no different from the pulleys of the flat transmission.