We understand the malfunctions of the checkpoint on the VAZ 2107
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We understand the malfunctions of the checkpoint on the VAZ 2107

03.03.2023 /

VAZ 2107 is a model that is considered a classic of the automotive industry in our country. And although the release of 2107 was completely stopped in the early 2000s, many motorists use this particular car for their personal needs. The popularity of the machine is made up of several factors, the first of which can be called the simplicity of the design. However, not all mechanisms are easily diagnosed and repaired; one of the most complex components in the design of a car is the gearbox.

When and how often do you need to repair the gearbox on the VAZ 2107

The manufacturer of the "seven" ("Volzhsky Automobile Plant") gives comprehensive information on when and how often the gearbox needs to be repaired. It turns out that this mechanism does not have a service life as such. The only thing that AvtoVAZ engineers insist on is the timely replacement of transmission oil:

  1. After the first 2 thousand kilometers on a new car.
  2. After 60 thousand kilometers.
  3. Further, if necessary, depending on the care of the owner and the frequency of use of the car.

Accordingly, the plant does not have any specific wishes and requirements for preventive or repair work. However, in any case, regardless of the mileage, it is necessary to carefully monitor all the nuances in the "behavior" of the box, since repairs will be necessary if the slightest malfunction occurs.

We understand the malfunctions of the checkpoint on the VAZ 2107
In winter, due to temperature changes, the box experiences an additional load

Box malfunctions

The design of the GXNUMX gearbox is designed for many years of service. Usually, the driver carries out the first and even the second overhaul of the engine, and only after that does it become necessary to repair the box.

In addition, the “seven” itself has gained a reputation as a “workhorse” throughout its long history. The machine really serves faithfully for many years, but this does not mean that each of its mechanisms will not wear out over time.

If we talk about malfunctions of the VAZ 2107 box, then most often drivers complain about three defects: the inability to turn on the desired gear while driving, knocking out the gear and a strong crunch in the box.

We understand the malfunctions of the checkpoint on the VAZ 2107
In the early years, a four-stage was installed on the VAZ 2107, since the beginning of the 1990s - a five-stage

Gear does not turn on

It is very difficult to drive a vehicle if the driver cannot change gear. On the one hand, the shift lever moves to the desired position, but, on the other hand, there is no shifting as such. Or the lever cannot be set to the desired speed shift position at all.

In any case, the problem lies precisely in the box:

  • some movable (hinged) elements of the shafts are very worn out - it is recommended to overhaul the gearbox;
  • wear of the blocking rings on the synchronizer - replace the rings with new ones;
  • the synchronizer spring is stretched or broken - replace the spring;
  • severe wear of the gear splines - only a complete replacement of the gear will help.
We understand the malfunctions of the checkpoint on the VAZ 2107
The problem is that the lever works, but the box does not.

Knocks out gear while driving

Another common problem with the gearbox is knocking out the gear immediately after it is engaged. The lever simply throws back, and the motor begins to experience overloads, since at high speeds it does not receive the necessary transfer ratio.

The malfunction may be associated with different elements of the box:

  • jamming of the hinge on the gear lever - it is necessary to remove the skirt of the lever, clean all connections and lubricate them;
  • breakage of the lever - it is not advisable to carry out repairs, it is easier to immediately replace the lever with a new one;
  • the clutch does not work correctly - in this case, all the blame cannot be placed on the box, it is quite possible that after adjusting the main elements of the clutch, the transmission will not be knocked out;
  • forks in the box are bent - it is recommended to replace the entire set of forks.
We understand the malfunctions of the checkpoint on the VAZ 2107
The driver sets the lever in the desired position, but it comes back

Crunch and rattle in the box while driving

The driver may not experience problems shifting gears, but while driving, hear a loud knock, crunch and rattle in the gearbox cavity:

  • the bearings on the shafts are broken - replacement is recommended;
  • gear splines are very worn out - you need to replace the entire gear;
  • minimum oil level in the box cavity - you need to add lubricant and make sure that there is no leak;
  • failure of the shafts (they began to move along a different axis) - replacement of bearings on both shafts.
We understand the malfunctions of the checkpoint on the VAZ 2107
Unusual sounds in the checkpoint are the first sign that the box needs to be checked and repaired.

It should be emphasized that some types of work with the box are available to the driver himself. It will not be difficult to knock the old bearing off the shaft and press in a new one. If it comes to the overhaul of the box, it is better to turn to professionals.

How to repair a checkpoint on a VAZ 2107

A four-speed gearbox was installed on the VAZ of the “old” model, and a five-speed gearbox was installed on the VAZ of the “new” sample. However, working with both mechanisms is not much different from each other. The essence of the repair work is to perform the following steps:

  1. Dismantling the box from the car.
  2. Dismantling the gearbox into its component parts.
  3. Replacement of failed elements with new ones.
  4. Box assembly.
  5. Installation of a gearbox on a car.

It should be noted that repairs should only be started if there are obvious signs of a box malfunction. As a preventive measure, it does not make sense to once again interfere with the device of this mechanism.

We understand the malfunctions of the checkpoint on the VAZ 2107
With such a defect, the shaft will not be able to work correctly, which will immediately affect the convenience of gear shifting.

Preparation of tools

To carry out all of the above work, you will need to prepare in advance:

  • heads for 13 and 17;
  • head extension;
  • Phillips screwdriver;
  • flat screwdriver with a thin blade;
  • flat screwdriver with a powerful flat blade;
  • impact screwdriver;
  • tweezers;
  • wrenches for 13 (2 pcs), for 10, for 17, for 19 and for 27;
  • snap ring puller (or pliers);
  • a hammer.

How to remove the checkpoint

You can repair the box only after it is removed from the car, so you will need to be patient and time. Repairing a gearbox is clearly a difficult and slow business.

To remove the box from the VAZ 2107, you will need to drive the car into a pit or an observation deck. The jacking option is not suitable, since it will be impossible to complete all the stages of work:

  1. Disconnect the wire from the negative battery terminal.
  2. The first stage of work is carried out directly from the salon. It is necessary for convenience to remove the panel in which the radio is located.
  3. Press the gear lever, insert a flat screwdriver into the hole in the locking sleeve of the box.
  4. Using a screwdriver, pull the sleeve towards you.
  5. Disconnect the rod from the shift lever.
  6. Hook the edge of the damper insert with tweezers and remove it.
  7. Use two flat screwdrivers to open the petals of the damper insert, spread them apart.
  8. Then remove the damper and bushings from the gear lever.
  9. In the cabin, move the foot mat in the area of ​​the checkpoint.
  10. Using a Phillips screwdriver, unscrew the four screws on the box cover.
  11. Remove the cover from the gear lever.
  12. The second stage of work is carried out directly under the car. The first step is to dismantle the exhaust manifold pipe from the box.
  13. Disconnect the clutch mechanism.
  14. Immediately remove all connections from the gearbox (at the same time, you can check the integrity of the wires).
  15. Disconnect driveline.
  16. Remove the flexible shaft mounting mechanism from the speedometer.
  17. Unscrew the two bolted connections on the gearbox side cover.
  18. Remove the box from the car.
  19. Place something strong and stable under the box body, as it may fall out.

Video: dismantling instructions

How to remove the box (gearbox) VAZ-classic.

Attention! The gearbox on the VAZ 2107 weighs 23 kilograms (with oil), so it is recommended to dismantle it together.

How to disassemble the box

Repair work on the gearbox is possible only after identifying the real cause of the breakdown. Therefore, it will be necessary to disassemble the device correctly and safely for each component of the box and carry out troubleshooting.

In order for the disassembly process to go quickly and without interference, it is recommended to immediately prepare the following tools:

Of course, as needed, gaskets, seals, and those parts that were rejected during the work will be needed.

Operating procedure

Dismantling the box on your own in garage conditions is a completely doable task. However, the work will require maximum concentration and attention:

  1. After removing the gearbox from the car, it is recommended to rinse the housing from dirt. You can even use kerosene or mineral spirits to make sure the surface of the box is clean.
  2. Remove the bell (casing).
  3. Turn the box over and unscrew the cover screws.
  4. Remove the gear block plug from the rear cover.
  5. Pull out the retaining ring with tweezers.
  6. Press out the gear block bearing.
  7. Press out the reverse gear bearing.
  8. Remove the output shaft seal.
  9. Pull out the thrust washer of the rear output shaft bearing.
  10. Press out this bearing.
  11. Remove the speedometer drive gear, then pull out the roller ball (retainer).
  12. Loosen the gear shift fork bolt.
  13. Block the shafts by inserting a thick bolt or a powerful screwdriver between them.
  14. Turning the input shaft, pull it towards you along with the gears and bearings.
  15. Then pull out the output shaft.
  16. The intermediate shaft comes out easily.

Video: instructions for disassembling a gearbox on a VAZ classic

Bearing replacement

Most often, problems with the box begin with the fact that the bearings break. Therefore, the bulk of all breakdowns leads to the fact that the driver needs to disassemble the gearbox and change the bearings.

Bearings cannot be repaired, as their design does not allow replacement of parts (rollers). Therefore, if the product is out of order, it is completely replaced.

Input shaft bearing

To change the input shaft bearing, you must have the same tools as when disassembling the gearbox. The work is not difficult, but it can take a lot of time (depending on the physical fitness of the performer and his skill).

The procedure is as follows:

  1. Clamp the input shaft with a vise. It is better to lay the jaws of the vise with a soft cloth so that they do not deform the surface of the shaft.
  2. Clamp the bearing with a puller and begin to slowly pull it off the shaft.
  3. Periodically, you need to tap on the bearing with a hammer, and rotate the shaft between blows, otherwise there may be a misalignment in the rollers, and it will be very difficult to remove the bearing.
  4. Gradual knockout will cause the bearing to come off the shaft.
  5. Press a new bearing onto the shaft using the same method.
  6. It is important to hit with a hammer only on the inner ring of the bearing and do it carefully.

Replacing the input shaft bearing can also be done on an unassembled box in the same way. Only in this case it will not be possible to use a vice.

Video: replacement instructions

Output shaft bearing

The replacement of the bearing of the secondary shaft is carried out according to the same principle as the primary one. The only difference is that different types of bearings are used for different shafts.

According to GOST, to equip the input shaft of the VAZ 2107 gearbox, bearings of closed (6–180502K1US9) and open (6–50706AU) types are used. An open type bearing (2107–1701033) is used to equip the secondary shaft.

Oil seal replacement

Most often, gaskets and seals are subject to wear. And if even an inexperienced driver can change the gasket, then the replacement of oil seals should be taken as carefully as possible.

By design, the gland is a rubber gasket that acts as a sealant. That is, if the oil seal breaks or wears out, the box ceases to be airtight, which, in turn, leads to oil leaks and breakdowns.

The oil seal in the VAZ 2107 gearbox is not made of rubber alloys, as most drivers think. In fact, the product is made of special composite materials, which are much more durable than rubber and less susceptible to tearing. In its working condition (that is, constantly), the oil seal is in gear oil, so its elasticity remains for a very long time.

In order to restore the tightness of the gearbox, it will be necessary to change this gasket. For work you will need:

Input shaft oil seal

The input shaft oil seal of the VAZ 2107 gearbox has the following performance characteristics:

Accordingly, in order to replace the gearbox input shaft oil seal, you will need to remove the gearbox from the machine and disassemble the casing:

  1. Remove the bell (casing) from the box, it is mounted on four bolts.
  2. Remove the fork and release bearing from the box (the fork is fastened with screws, the bearing will either have to be knocked out with a hammer or pressed out with a vice).
  3. Opens access to the input shaft and its stuffing box.
  4. Pry off the old ring with the blade of a knife or screwdriver and remove it from the shaft.
  5. It is good to clean the place of landing of the stuffing box from dust and dirt.
  6. Install a new seal.
  7. Assemble gearbox in reverse order.

Photo gallery: main stages of work

The work of replacing the input shaft seal is not particularly troublesome.

Output shaft oil seal

The output shaft oil seal is slightly different in its characteristics from the input shaft gasket:

The oil seal is replaced on a removed gearbox:

  1. The first step is to firmly fix the flange of the box, you can insert a bolt or a thick screwdriver into it.
  2. Turn the flange nut with a wrench.
  3. Pry off the centering metal ring with a screwdriver and pull it out of the secondary shaft.
  4. Remove the bolt from the hole.
  5. Place a puller on the end of the output shaft.
  6. Remove flange with washer.
  7. Using screwdrivers or pliers, remove the old oil seal from the box.
  8. Clean the joint, install a new seal.

Thus, replacing the output shaft seal is somewhat more difficult than doing the same job on the input shaft. The difference is related to the location of the seals and their dimensions.

Photo gallery: main stages of work

How to replace gears and synchronizers

The gearbox on the VAZ 2107 is a complex device. Therefore, if there is no self-confidence, it is better not to start replacing gears, but to turn to the masters for this service.

However, if it was decided to independently replace worn gears and synchronizers, you will need to prepare the necessary tools in advance and buy a repair kit for replacement.

The standard repair kit for the 2107 gearbox shafts usually includes gears, synchronizers, washers, a pin, nuts and bolts.

For work you will need:

The replacement of gears and synchronizers on the primary, secondary or intermediate shafts is generally carried out according to the same scheme:

  1. Remove the shaft from the box.
  2. Clamp the shaft in a vise (it is important to wrap the jaws of the vise with a soft cloth so that they do not damage the surface of the shaft during operation).
  3. Loosen the circlip with a screwdriver and remove it.
  4. Press out all bearings.
  5. Unclench the vise and rest the first gear on two supports.
  6. Compress the gear by gently tapping it with a hammer.
  7. Perform the same actions in relation to all the following gears and synchronizers.

Video: instructions for removing gears from the shaft

During operation, it is necessary to carefully inspect the shaft. Between the gears can be clamps, retaining rings and other small parts. They must be removed without fail, otherwise it will be impossible to remove the gear.

Accordingly, the installation of new elements takes place in the reverse order.

Thus, repairing a gearbox on a VAZ 2107 cannot be called a simple task. The driver needs not only to exert maximum physical effort, but also to act with extreme caution so as not to damage the shaft and its elements. If you are unsure of your abilities, it is better to contact a car service specialist.

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