Front/rear axle gear differential self-locking screw “AVT” VAZ 2101-2107, 2121-2131

Do-it-yourself differential locking on a VAZ 2109 will help the motorist increase the vehicle’s off-road capability. Any driver at least sometimes has to drive on roads that are not characterized by a flat surface. Most of them not only do not realize that special locks are installed on their car, but also do not know why they are needed. The indisputable advantage of the device is its simplicity. Its design includes:

• body parts - 2 pcs.;
• semi-axial gears - 2 pcs.;
• satellite gears - 10 pcs. (when purchasing, keep in mind that they all must be cylindrical);
• separator.

When the vehicle is driven on level ground, the differential lock operates like a normal differential. The process is that the side gears begin to rotate at the same speed. With the help of satellites, the working force of torque is simply transmitted with equal force to both wheels at once, and the entire structure rotates along with the body.

ARB Air Locker Review

The most common way to lock a differential is using an ARB Air Locker. By its type, this is a blocking that must be turned on forcibly. When the device begins to operate, a fairly tight closure of the axle shafts occurs between certain parts of the bridge. This particular type of blocking is considered the most severe.

The device includes the differential itself, an air compressor and pneumatic lines. They are required in order to create the pressure necessary for work. It must exceed two atmospheres, only in this case the blocking will be activated.

The differential locking system under consideration has one significant advantage, which is the soft operation of a conventional differential on hard surfaces.

In addition, it allows you to achieve the most comfortable balancing. Of course, the system also has disadvantages, the main one of which is considered to be a very significant cost. Negative properties include the need for certain skills in use and a rather complex installation procedure.

Advantages and disadvantages of self-locking gearboxes on the VAZ 2107

First, let's list the advantages that locking on the VAZ 2107 provides:

• increased traction of the driving wheels in any conditions;
• good cross-country ability in sand, mud and snow;
• improved acceleration dynamics;
• good cornering.

But the locking differential comes at a price:

• handling deteriorates in rear-wheel drive vehicles, which include the VAZ 2107;
• it becomes more difficult to hold the car when accelerating;
• the tendency of the “seven” to skid when cornering increases;
• high friction links appear, which lead to an increase in wear rate and fuel consumption.

Self-installation of the device

In order to do the work of installing the lock yourself, carefully remove one of the side gears located in the differential housing. To do this, you will need to rotate the satellite axes 90° and remove the gear from the housing. Next, remove the retaining ring from the same place, after removing the pinion axis from the differential housing.

Remove the bolts that secure the driven gear to the housing and press it together. You will need to remove the differential bearings using a puller. Please note that during the procedure described, the bearings may be destroyed. It is important to remember that at the manufacturer the parts are selected in pairs. Consequently, all gears match in noise and contact patch.

Therefore, when replacing the gear, you will also need to work on the output shaft drive gear.

These parts are sold in pairs only. To check compatibility, count the number of gear teeth.

The undeniable advantage of hard locking when installing on a VAZ 2109 is that installation is relatively difficult, which in the future will only benefit the car owner. Due to certain difficulties during fastening, additional reliability is provided.

It is necessary to pay immediate attention to the fact that the locking system should under no circumstances be installed on the front axle of the VAZ 2109, because of this the car will simply lose control.

SHOULD WE INSTALL OR NOT?

Whether a limited-slip differential is needed on a front-wheel drive car is a controversial issue. Those who consciously, and most importantly, competently tune their car in order to get a sharp driving experience, will benefit from this modification. Moreover, we considered only one of the options for a self-locking differential. It is possible that someone will prefer a unit of a different design and with different settings. Experiment for your health, just remember: driving skills must also be at the appropriate level, because correcting piloting errors in a car with a limited-slip differential is much more difficult.

And drivers without special driving fantasies probably don’t need such modernization. It is unlikely to be able to fully use the specific advantages in handling, but it will definitely lose in comfort. A limited-slip differential will give a slight advantage off-road, but will not turn a passenger car into an all-terrain vehicle. In this case, you will have to pay several tens of thousands of rubles for the unit and installation. So is it worth it? I think no. However, no one forbids you to find out from your own experience whether we are right.

Differential VAZ 2114 and its types

There are several varieties of the product. The differences depend on the types of automobile bodies and the very principles of operation of the element. Additionally, the actual location of the differential itself may vary. For example, for front-wheel drive the location in the gearbox is relevant, for rear-wheel drive - in the rear axle housing, and so on.

There are canonical, cylindrical, and the most common - worm differentials. In addition, the self-locking differential of the VAZ 2114 is gaining great popularity among car owners.

Its main advantage is blocking forces in one place and transferring the moment to where it is really needed. For example, in a situation where one of the drive wheels is stuck or slips on a smooth surface, the second wheel receives increased torque. The advantages of using the product are obvious:

• the vehicle's cross-country ability increases;
• Full interchangeability with the classic unit is guaranteed;
• reliable operation is ensured.

The most important thing is that the differential lock on the VAZ 2114 allows the car’s wheels to make maximum use of contact with a hard surface to create traction and ensure further movement of the vehicle.

diff

Thanks to the self-locking differential, the Kalina moves almost 2 km/h faster (95.6 vs. 93.8 km/h).
Compared to the behavior of standard vehicles, the steering angles and lags are smaller, when performing a maneuver there is almost no skidding and no subsequent vibrations occur. Thanks to the self-locking differential, the Kalina moves almost 2 km/h faster (95.6 vs. 93.8 km/h). Compared to the behavior of standard vehicles, the steering angles and lags are smaller, when performing a maneuver there is almost no skidding and no subsequent vibrations occur.

In extreme situations, the VAZ baby becomes even more disobedient and worse predictable. During the first laps on a closed track, you manage to drive faster, managing to compensate for the spontaneous slips that arise, either with the front axle or the rear - a very sharp skid, and sometimes, on the contrary, a rather long drift. You have to work harder with the steering wheel and gas than on the Kalina with a free differential. However, despite the fact that there are more errors and the trajectories are far from optimal, the lap times are better.

How to adjust the differential preload of a VAZ 2114

It happens that the blocking begins to lag or does not work at all. The reason is that the preload decreases or disappears altogether. In this case, you should not rush to change the entire assembly; it is recommended to try to increase its value (preload) yourself. To do this, you need to select the required thickness of the adjusting ring and install it in the gearbox housing socket. The whole procedure is quite labor-intensive, so it is recommended to use the vehicle’s operating instructions.

Causes of malfunctions

Due to the design features of the differential and its operational purpose, destructive processes occur due to friction, force loads and other reasons. As a result, active wear of the unit and its elements occurs. The main causes of malfunctions are as follows:

• Bearing wear and damage to their integrity;
• Damage or wear of oil seals;
• Insufficient amount of oil in the transmission, as well as its poor quality;
• Other reasons.

LOCK ON YOUR HEALTH!

Togliatti produces helical and cam limited-slip differentials with preload clutches, which ensure smooth and quick locking and dampen the load on the transmission. In addition, the clutch allows you to vary the blocking coefficient. For passenger cars that drive mainly on asphalt, a differential with a tension of 4.5–6 kg/m is suitable (it is indicated on the packaging), but for all-terrain vehicles it is better to use units with higher values. On the test Kalina, a differential with a tension of 3.5–5.0 kg/m was installed. For reference: the cost of the unit is about 10 thousand rubles, and its installation will cost about the same.

Do you need a self-locking unit for front-wheel drive?

Replacing differential VAZ 2114

Due to the fact that the drive of the VAZ car of the fourteenth model is the front one, the unit of interest to us is located in the gearbox. Therefore, to remove and replace the differential itself, you will need to dismantle the gearbox itself. We will not describe in great detail all the nuances of the process of removing the box, but will focus only on the main stages.

So, the steps to remove the gearbox are:

1. We place the car on the lift.
2. Using a screwdriver, hammer and a special wrench, unscrew (loosen) the hub nuts on the two front wheels;
3. We raise the car to the height required for work;
4. If the crankcase protection is installed, then remove it.
5. Drain the oil from the box. If you do not plan to change it, then pour it into a clean container for reuse;
6. Remove the flywheel protection;
7. Loosen the clamp and unscrew the fastening of the gear shift lever;
8. Now you need to disconnect the drive. To do this, on one side, with a sharp movement using a long lever with a flat end, we tear off the joint from the drive. As a result, a small gap should form.
9. The second wheel will require similar steps. The only difference is that you will have to disassemble the suspension so that nothing interferes with dismantling (remove the wheel, ball joint, unscrew the stabilizer link, unscrew the lever). Afterwards, we pull out the fastener.
10. Before unscrewing all the bolts and removing the box itself, place a stand under it, this way you will avoid falling and damaging the unit.
11. Don't forget to disconnect the connector from the speed sensor and the wire to the tail lights, otherwise you will tear them off. In the engine compartment, remove one of the battery terminals. Disconnect the terminals from the starter. From the ignition module, unscrew the bolt that connects it to the box. Release the clutch cable (disconnect it).
12. We unscrew all the bolts securing the box and mounting pad.
13. Carefully remove the box from the block.

Now all the preparatory conditions have been met, and you can begin to directly disassemble the gearbox itself and replace the differential.

Further steps are shown in this video:

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If you want to improve the cross-country ability of a single-wheel drive car, then a self-locking differential (at least with a slight interference fit) is not the best solution.
The marginal improvement in all-terrain performance is not worth the investment. If you want to improve the cross-country ability of a single-wheel drive car, then a self-locking differential (at least with a slight interference fit) is not the best solution. The marginal improvement in all-terrain performance is not worth the investment.

Let’s supplement the subjective sensations with those experienced on light off-road conditions. The site was chosen to be ideal: as you move forward, the surface under the wheels gets worse. We passed a place where a car with a loose differential had recently gotten stuck. However, with the blocking, she moved only a little further. Toothy tires and especially snow chains would have given no less confidence.

Types of blocking

VAZ cars do not provide for the installation of a standard differential lock up to the tenth model, so the installation of the system on such cars must be carried out independently. There are four locking options, but it is strictly not recommended to preload the gearbox or weld the satellites.

System options:

Permanent locking is only necessary for large vehicles on permanent off-road conditions. In other cases, a number of features must be taken into account. For example, for the 2110 model, a disc gearbox will not be the best option, since it requires constant maintenance and the use of special oil. Also, constant friction increases fuel consumption and worsens the car’s handling, and the components themselves wear out quickly on a bad road.

The viscous coupling has a high inertia, so the mechanism overheats and operates with a delay. It is not suitable for off-road use, only for city streets. The design is expensive and complex, so not everyone will like it.

Screw and planetary mechanisms are the most relevant. They perform well on rough terrain and snowy roads, but are not suitable for off-road use.

Types of blocking

There are three types of blocking:

1. Partial – protects against slipping, but is not very intense. It is an automatic system that does not require driver control. Moderately loads the transmission and protects it from premature wear.
2. Automatic – works constantly and automatically adapts to driving. Does not require activation by the driver, easy to install, but requires more effort when turning. Due to the constant operation of the automatic system, there is a strong noise from the tires when cornering, and clicks are heard when the system gears enter the clutch.
3. Manual - activated by the driver using a switch. Then the limiting unit is activated, which blocks the distribution of torque. The driver himself determines the need to use the system; it is durable and effective. The driver is forced to be distracted by turning on the system, which often happens in very difficult conditions. It is also important to remember that the system must be turned off on level roads, otherwise the differential may fail. When installing the system, it is necessary to install a limiter and its activation system.

For many car owners, a manual lock activation system is the best option.

Self-locking differentials

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