Repair of the rear axle of a VAZ 2107

Device

In order for the car to move, it is necessary to transfer the rotation of the engine to the wheels. But the engine speed is too high, and in order to correctly distribute the torque, a mechanism is needed that changes the gear ratio. Due to the gearbox and different engine speeds, the speed of movement changes, and the main pair of the rear axle takes over the rotation and transmits it to the wheels through gears.

flange, it is fixed on the drive gear (shank) of the RZM, and is an intermediate link between the driveshaft and this gear;
the shank of the main pair, at one end of which there are splines for pressing the flange, at the other end there is a bevel gear with a small number of teeth;
driven gear (planet gear), it is in mesh with the drive gear, and it is with it that it forms the main gear;
center differential, allowing the rear wheels to spin at different angular speeds.

The differential design is very simple - the mechanism consists of two axle gears, two satellites and a satellite pin. From the gearbox, the movement is transmitted to the axle shafts, on which the wheels are mounted.

Differential device

The planetary gear is mounted on the differential housing. The differential consists of two axle gears, two satellites and a pin. The main, most common differential malfunctions are wear of the pinion pin (play) and wear of the splines on the axle gears.

On a car, the play of the pin of the satellites can be determined by turning the driveshaft by a quarter or more; if there is no play, then the shaft practically remains in place when you try to turn it in one direction or another.

It's also worth noting that there is never any noise coming from the differential. When moving forward (in a straight line), the differential rotates as one unit and it turns out that there is simply nothing to make noise there.

The cause of noise from the rear axle gearbox when gas is added and the noise disappears after releasing gas is (almost 99.9%) wear of the teeth of the main pair. This is clearly visible on the removed gearbox. The forward side of the teeth has significant wear, while the reverse side shows little wear.

If, after disassembling and troubleshooting the parts of the main pair, wear of the teeth is detected, then no repair will help and it will simply be a waste of time and money. Only the main pair needs to be replaced.

Home-couple

The gears of the main pair are selected at the factory based on contact patch, noise and other parameters and are marked. For example, on the planetary gears it is stamped - VAZ 2103 (model), 10 41 (gear ratio), 4091 (pair number). The main pair number 4091 is also marked on the bevel gear.

Differences in VAZ rear axle gearboxes

RZMs differ in the gear ratio of the main pair; in total, there are four types of gearboxes on the VAZ classic:

The slowest one is the RZM 2102, its drive gear has 9 teeth, and the driven gear has 40 teeth. To calculate the gear ratio, you need to divide the number of planetary gear teeth by the number of teeth on the drive shaft; for the VAZ 2102 the drive gear is equal to 4.44.

The “penny” gearbox (2101) accordingly has the number of teeth on the gears 10/43, so its IF is 4.3. The next, faster one is RZM 2103 - it has a ratio of 1041, which means the gear ratio is 4.1. And finally, the “fastest” will be the 2106 gearbox, with the number of teeth 11/43 and an inverter frequency of 3.9, respectively.

Many VAZ 2101-07 owners strive to install the fastest gearbox, but this is not always necessary. If the car often carries cargo, that is, the car is a “workhorse”, high speed is of no use, but high-torque power will be very useful. It should be noted that RZM 2102 was not supplied as spare parts; it was installed only on station wagons.

The VAZ 2107 gearbox is adjusted, author Nikolay Vladimirovich Zhdankin

About replacing the rear axle gearbox of a VAZ 2107

We welcome car enthusiasts of classic VAZ models to the autoblog RtiIvaz.ru! In these videos we will look at the VAZ 2107 gearbox and adjustment. Nikolai Vladimirovich dedicated the video to the owners of rear-wheel drive cars, since today the trend is towards rear axle gearboxes. As a visual aid for repairs and adjustments, we showed the rear axle gearbox of the VAZ 2107, a common domestic car.

The main elements of the gearbox are helical gears of the main gear, the so-called “conic” and “planetary gear”, which make up the main gear pair. The plant produced four versions of the main pairs:

Low-speed, installed on the VAZ 2102. The pair has 9 teeth on the bevel gear and 40 on the planetary gear. The torque transmission number is 4.44, this is a low-speed option. Out of production;
On the VAZ 2101 - the famous “kopek”, the main pair had 10 teeth on the “point” and 43 on the “planetary”, with a gear ratio of 4.3, discontinued;
VAZ 2103, respectively, 10 teeth on the tip and 41 on the planetary gear;
VAZ 2106 - 11 teeth on the “pivot” and 43 on the “planetary”, gear ratio 3.9, is considered a high-speed gearbox.

It should be noted that the main pair with a gear ratio of 4.44 for the VAZ 2102 was, generally speaking, not produced as spare parts and was intended only to complete the VAZ 2102 gearboxes on the factory assembly line.

Replacing the rear axle gearbox of VAZ 2106, 2107

The main disease of REM is increased noise (hum), and the gearbox can hum for various reasons:

there is insufficient oil in the bridge, or it is completely missing;
the gap between the gears of the main pair is not adjusted;
the gears are worn out, they have chips and other damage;
the main pair has a manufacturing defect, the gears are not ground in from the factory;
the shank nut has become unscrewed or loosened;
bearings are worn out.

The main malfunction of the center differential is the wear of the gears of the axle shafts and satellites, when the surfaces of the parts are heavily worn, play forms between the differential gears, but the rear axle usually does not make noise due to wear of the differential gears.

ZM gearboxes on VAZ classics can be repaired, but only if there is no wear on the gears. If the mechanism can no longer be repaired, it needs to be replaced. We replace the rear axle gearbox of a VAZ 2106 on a “seven” as follows:

we install the car on a pit or a car lift; changing the gearbox on the ground is extremely inconvenient;
if the car is installed on a pit, it is necessary to jack up both sides; in any case, the rear wheels must be removed. If the work is not done on a lift, you should install stops under each side of the car (in the rear);
unscrew the drain plug in the REM, drain the transmission oil, having previously prepared a container for it;
remove the rear brake drums (two guide bolts on each side), after first removing the car from the handbrake. The drums can be difficult to remove; they are dismantled by tapping them from behind with a hammer through a wooden block. You cannot hit the drum with a metal hammer; the drum may break;
remove the brake pads;
unscrew the fastenings of the rear axle axle shafts on each side, each axle shaft is secured with four nuts;
we press out the axle shafts, for this you will need a special puller, you can also make a homemade device;
remove the driveshaft by unscrewing the four bolts and nuts. If the same REM is installed, the cardan with the shank must be marked; this is done in order to put the shaft back in the same position. If you install the cardan incorrectly according to the marks, the shaft may begin to vibrate;
unscrew the eight bolts securing the rear gearbox (key 13), remove the assembly.

At this point, the removal of the gearbox can be considered complete; now all that remains is to either repair the mechanism or install a new one instead.

Adjusting the VAZ rear axle gearbox

If the main pair in the gearbox is worn out, it must be replaced. But you can’t just put the gears back in place; the gaps in them must be adjusted. In total, two types of basic adjustments are made:

The thickness of the adjusting sleeve (washer) is selected for the shank (drive gear). The washer can have a thickness from 2.6 mm to 3.5 mm;
The gap between the gears of the main pair is adjusted using two adjusting nuts of the differential housing.

The washer for the shank is selected in such a way that the shaft with the drive bevel gear rotates in the gearbox housing without backlash with a force by hand (0.3-0.4 kg). In this case, the shank nut should be tightened with a force of 12 to 26 kg, usually 18-19 kg are tightened.

After installing the shank, the differential housing with the planetary gear attached to it is put in place. The housing is secured with two covers (4 bolts, a knob with a 17mm head). The adjusting nuts are tightened from the sides of the bearings, the differential is installed so that there is play between the gears of the main pair, and the planetary gear should not be clamped. By moving the adjusting nuts to the right and left, the shank gear is brought to the planetary gear. By adjusting, you select the moment when the gap between the gears practically disappears.

The last stage is to adjust the preload of the differential bearings; the adjusting nuts are tightened from the sides. This work must be done with an indicator; the device should show from 0.14 to 0.18 mm, the gap between the gears should be within 0.08-0.13 mm. After the operation, the adjusting nuts are fixed with plates so that they do not turn.

It should be noted that adjusting the VAZ rear axle gearbox is a very difficult matter, and it is better to trust it to professionals.

Nut tightening

Now the most important point is tightening the nut. To properly tighten the nut, you need to do the following preparatory work:

hang up the rear of the car;

Remove the rear wheels and brake drums.

Tighten the nut until you feel a slight stop. Thus, we brought the bearings to the new spacer, but we had some play in the flange. He must be. This is normal with a new spacer. We tighten the nut 10-20 degrees and check the play. Tighten the nut until there is no play. Next, we check the force to break the flange using a digital scale. We insert the “ear” of the scale into the hole on the flange and pull it at a right angle. The breaking force should be within 1.5 kg. If the force is less than 1.5 kg, tighten the nut literally by degree and control the force.

The tightening torque of the nut should be from 12 to 26 kg/m when the required force is achieved. If, after eliminating the flange play, the force is significantly more than 1.5 kg, then you have received a defective spacer sleeve.

Next we reassemble:

We fasten the cardan according to the marks;
Fill in new oil (you need to pour oil with API GL-4/GL-5 approvals, volume 1.5 liters);
We install brake drums and wheels.

The process of replacing the rear axle gearbox seal of a VAZ 2107 is clearly shown in this video:

Repair or replacement, which is better?

Car owners of VAZ classics often cannot decide what is best to do - buy a complete ready-made REM assembled or purchase individual parts and repair the gearbox. It’s really difficult to decide here - the price of a new gearbox, of course, is higher, but the owner of the car is freed from the headache of adjustment. The thing is that it’s not so easy to find a good specialist in VAZ gearboxes, and there is no guarantee that the new main pair will not hum.

If a car owner buys a new gearbox, but it hums, the part can be exchanged under warranty, but the car owner loses money on removing and installing the gearbox. If you purchase a defective main pair, the repair itself will be more expensive - you will have to pay a technician for a secondary overhaul of the gearbox.

VAZ rear axle gearbox locking

On VAZ 2101-07 vehicles, the factory does not provide locking of the center differential, but the industry already produces both differentials with locks and fully assembled 3M gearboxes. The most common today are REMs with screw locking; in them, the differential gears are locked depending on the load. In such rear axle gearboxes, a preload clutch is installed, it connects the wheel axle shafts with a certain force, and acts as a blocker.

Locking the VAZ rear axle gearbox provides the following advantages:

increases cross-country ability, allows the vehicle to avoid slipping on difficult road sections;
allows the car to accelerate faster at the start;
The car corners more confidently.

But ZM gearboxes with screw locking also have their disadvantages:

Fuel consumption increases slightly;
when accelerating, the car handles worse;
The differential and assembled gearbox with locking are much more expensive than standard parts (the price is approximately 2-2.5 times higher).

VAZ 2101-07 car owners should know that after installing the RZM with blocking, the car will not become an SUV, and it will not be able to move on severe off-road conditions.

Malfunctions of the rear axle of VAZ 2101, 2102, 2103, 2104, 2105, 2106, 2107 cars

Increased noise from the rear wheels

— The wheel mounting bolts are loose

The bolts need to be tightened.

— Wear or destruction of the axle bearing

The axle bearing needs to be replaced.

Constant increased noise from the rear axle

— The rear axle beam is deformed

Replace the rear axle stockings or the entire axle.

We replace bent axle shafts with new ones.

— Wear of splines on axle shafts

— The rear axle gearbox is incorrectly adjusted, its gears or bearings are damaged or worn

The gearbox needs to be repaired or replaced.

— Not enough oil in the rear axle

Bring the level to normal, eliminate leakage.

Noise when accelerating a car

— Shock absorbers are faulty

Check and replace shock absorbers.

— Incorrectly adjusted gearing of the main gears after gearbox repair

Adjust the engagement by selecting the drive gear adjusting ring.

— Damaged axle bearing

— Not enough oil in the rear axle

Bring the level up to normal.

Noise when the car engine brakes

— Incorrect lateral clearance in the mesh between the final drive gears

Disassemble the gearbox and set the gap to 0.08 - 0.13 mm.

— Increased clearance in the drive gear bearings due to loosening of the flange nut or wear of the bearings

It is necessary to check the technical condition and moment of resistance to rotation of the drive gear.

Noise when accelerating and braking the car engine

— Wear or destruction of drive gear bearings

They need to be replaced.

— There is no lateral clearance between the teeth of the main gear gears

Disassemble the gearbox and set the gap between the teeth to 0.08 - 0.13 mm.

Noise when cornering

— Tight rotation of the satellites on the axis

Disassemble the differential, replace damaged and deformed parts.

Signs of gearbox problems

Rear axle gearbox for VAZ 2107: design, repair, replacement

The rear gearbox is one of the reliable mechanisms of classic Zhiguli cars and breakdowns rarely occur with it. However, like any other unit, it may have its own malfunctions, which are determined by characteristic symptoms. They are worth dwelling on in more detail.

Noise when accelerating

If during acceleration there is an extraneous sound from the gearbox installation site, then it can be caused by:

worn out or incorrectly adjusted differential bearings. It will require dismantling, disassembling and diagnosing parts with subsequent adjustment;
Incorrect meshing of the teeth of the main pair gears. Eliminated by proper adjustment;
lack of lubrication in the gearbox. The lack of oil in the crankcase is restored, after which it is checked for leaks at the places where the sealing elements are installed.

Noise when accelerating and braking the engine

If noise occurs both during acceleration and during braking by the power unit, there may not be many reasons:

deterioration or failure of the bevel gear bearings of the main pair. Eliminated by replacing failed elements;
Incorrect adjustment of the gap between the tip and the planetary gear. The mechanism needs to be diagnosed and replaced with damaged parts, as well as setting the required gap between the gear teeth.

Video: how to determine the source of noise in the rear axle

Knocking, crunching noise when moving

If the gearbox begins to make sounds uncharacteristic of its normal operation, then it will be possible to accurately diagnose the breakdown only after disassembling the unit. The most likely causes of a crunching or knocking sound may be:

tooth breakage on the gears of the main pair;
great wear of the main pair;
Problems or incorrect adjustment of the bevel gear bearings.

Noises when turning

Noise in the gearbox is also possible when turning the car. The main reasons for this phenomenon may be:

tight rotation of the satellites or the appearance of scratches on their surface. Eliminated by replacing damaged parts or treating roughness with sandpaper. If the defect cannot be removed, the failed parts must be replaced;
jamming of side gears. If the gears have barely noticeable damage, clean them with sandpaper. Elements with signs of heavy wear are replaced with new ones;
The gap between the differential gears is set incorrectly. It is necessary to set the correct gap between the gears;
defective semi-axial bearings. The ball bearings need to be replaced with new ones.

Knock when starting to move

The appearance of a knock in the rear gearbox of a VAZ 2106 at the beginning of movement may be accompanied by:

large gap between the splines of the bevel gear shaft and the flange. It is necessary to inspect the condition of both parts. If significant wear is detected on the splines, the elements are replaced;
increased gap between the teeth of the main pair gears. The problem is “cured” by adjusting the gap;
large amount of space for the pinion axle in the differential box. The box needs replacing;
The fastening of the reaction rods of the rear beam has become loose. It is necessary to inspect and tighten the fastening.

Gearbox jammed

Sometimes the REM may jam, i.e. torque will not be transmitted to the drive wheels. The reasons that can lead to such a malfunction are as follows:

lack of lubricant in the mechanism, which could leak due to leakage of the unit;
failure of satellites;
damage to the bearing on the bevel gear of the main pair.

Lack of lubrication in the gearbox leads to increased production and jamming of the mechanism

Oil leakage can be determined without disassembling the gearbox, but other faults cannot be identified without this procedure. If, after disassembly, scuffs, broken teeth or visible damage to the bearing are found on the gears, then the parts need to be replaced.

Oil leak

Lubricant leakage from the “six” gearbox is possible for two reasons:

failure of the shank oil seal;
damage to the gasket between the gearbox and the rear axle stocking.

To accurately determine where the oil is leaking from, you need to wipe off the lubricant with a rag and after a while inspect the gearbox: the location of the leak will be noticeable. After this, you can take further actions - remove the entire gearbox to replace the gasket, or dismantle only the cardan and flange to replace the lip seal.

An oil leak is indicated by a wet gearbox in the lower part.

What is an axle reducer?

The rear axle gearbox is a set of mechanisms designed to transmit the torque of the propeller shaft to the axles of the rear wheels. To understand that it requires a gearbox, you need to know how the engine energy is transferred to the wheels of the car.

During operation, the rotation of the engine crankshaft is transmitted to the vehicle's clutch disc, and then to the input shaft of the gearbox. The gear selected by the driver transmits rotation to the output shaft of the gearbox, and then to the crosspiece of the driveshaft, which extends under the car to the rear axle gearbox. The rear axle gearbox distributes torque from the driveshaft to the axle shafts, which, in turn, drive the wheels. Thus, the rear axle gearbox is designed to convert the torque of the propeller shaft to the two axle shafts of the rear wheels of the car.

Diagnostics and causes of malfunctions

The fact that the gearbox is in a faulty condition is indicated by the appearance of a characteristic noise (hum) when the vehicle is moving. To accurately determine the gearbox malfunction, there is the following experiment.

You need to accelerate the car to 25 kilometers per hour and gradually pick up speed, starting from this mark. If suspicious hums appear, be sure to record the speed at which you hear them.

Once you reach the desired speed, slowly release the gas pedal and apply engine braking. Again, listen for extraneous noises and pay attention to the speed at which they appear or disappear.

Certain noises should appear and disappear at the same speed. If this happens, it means that the rear axle gearbox is in a faulty condition. However, to be 100 percent sure, be sure to put the car on the parking brake, put the gear in neutral and try to gain speed, if the noise appears again, then the problem is not in the rear axle gearbox, and if there is no noise, then you can be sure that it is rear axle gearbox.

The cause of malfunctions, most often, lies in the use of low-quality oil, loss of its viscosity, as well as its complete absence. In addition, the gearbox may fail due to failure of oil seals, bearings and special gears. Sometimes, the cause of a rear axle gearbox failure is a broken axle shaft.

Assembly procedure

After the repair has been completed and all the damaged elements have been replaced, it is necessary to reassemble the rear axle and make sure that the gearbox no longer makes noise when driving.
The process looks like this:

the new node is fixed in the place intended for it;
return the axle shafts to the bridge;
the gear flange is attached to the cardan;
install wheels and brake drives.

It is necessary to test the car both at low speeds and at high speeds. First of all, leaving the car in neutral gear, press the gas. Then accelerate smoothly, and then turn off the engine. In a situation where the noise is still heard, an unambiguous conclusion should be drawn: you made some mistake or the reason was not in the gearbox.

When the car moves without any extraneous sounds, you can safely operate it as usual.

How to repair a gearbox on a VAZ 2107

If you decide to carry out repair work, you must remove the gearbox from the car. To do this, first of all, drain the oil from the gearbox: unscrew the drain plug at the bottom of the gearbox and place an empty container. At the end, the oil will need to be replaced with new one.

Now you need to unscrew all the screws that secure the gearbox shank to the driveshaft flange. Then lift the rear of the car and remove both wheels. Remove the brake drums and unscrew the bolts that secure the axle shafts. Pull out the axle shafts, thus completely freeing the gearbox. There will be 4 gearbox mounting bolts left, which also need to be unscrewed. After this, you can safely remove the gearbox.

To repair the gearbox, it must be disassembled. To do this, unscrew all the nuts that secure the shank, pull out the flange, gear with special adjusting rings, rubber seal and inner ring of the bearing. Then press out the outer bearing races and then disassemble the differential and drive gear. Once you have completely disassembled the gearbox, discard the locking spacer.

As you understand, the spacer sleeve needs to be changed in any case. This part is disposable and cannot be reused. Also, if the condition is unsatisfactory, it is recommended to change the bearings and the main pair. The pair allocates a gear ratio, and the larger it is, the higher the power of the gearbox. A small gear ratio increases the speed characteristics of the gearbox. What to choose is up to you. The selection of the gear ratio is precisely the adjustment of the gearbox.

After selecting the gear ratio, change all the oil seals and seals and reassemble in the reverse order.

If the gearbox is in very unsatisfactory condition, it is recommended to completely replace it with a new one. This is a good saving on the work of car service specialists.

Installation of a new or repaired gearbox is carried out in the reverse order. First, install the gearbox itself, tighten the fastening bolts and insert the axle shafts and secure them. After this, install the cardan to the shank and fill the gearbox with new oil.

Where is the gearbox located?

On the "sevens", as on all representatives of the rear-wheel drive family, the gearbox is located at the rear, under the bottom of the car. It connects the cardan to the VAZ 2107 axle and causes the wheels of the car to rotate. Rotation occurs thanks to axle shafts engaged in the gearbox, which, due to the technical features of the rear axle of the VAZ 2107, will have to be removed later. If the car is lifted, or when viewed from a garage pit, the gearbox is simply impossible not to notice.

Signs and malfunctions of the classic rear axle gearbox

Replacing a gearbox with your own hands is a labor-intensive process, which includes not only the purchase of a new unit (quite expensive), but also time costs. Therefore, before you start, you need to make sure that the gearbox is faulty. You can define the signs like this:

gradually accelerating the car, listen carefully and remember at what moment the noise appears;
while driving, start engine braking (remove your foot from the gas pedal at speed), at this time listen to the gearbox and note the moment the noise appears;
accelerate the "seven" to hundreds, switch to neutral and turn off the engine - listen to how the gearbox behaves while coasting.

“If the bridge is noisy both in neutral and at speeds, the gearbox has nothing to do with it. If the hum occurs only at speed (regardless of the number), repairs, or, as a last resort, replacement of the gearbox are inevitable.”

When the signs are identified, it is necessary to carry out another check:

park the car, secure the front wheels with shoes;
jack up the rear so that the bridge hangs over (it is necessary that the wheels come off the surface);
start the engine and accelerate the “seven” to the point at which noise occurs, while the wheels should spin without load.

If the noise has not changed, then the gearbox is clearly in good working order and it is not the cause of the trouble. Here other drive units are checked. Well, if there is no noise when driving without a load, then we are talking about worn gears of the gearbox, which make noise only when driving with a load.

The “seven” gearbox itself is a fairly reliable unit that can withstand a period of 100 to 300 thousand mileage, and there is no need to even look into it. Gears, gear spacer, differential adjustment - all these problems arise during improper operation:

the use of oil with a low viscosity level, as well as failure to comply with the terms of its replacement;
operating the “seven” with an amount of oil insufficient for this;
During movement, the bridge is subject to extreme loads (frequent and unsuccessful slips).

Gearbox removal process

In order to repair or replace the rear axle gearbox of a VAZ 2107, you first need to remove it from the car:

Drain the oil. This, by the way, may be a reason to replace it.
Separate the flanges of the cardan and gearbox. To do this, you need to unscrew four bolts and nuts. At this time, it is necessary to fix and immobilize the cardan with a screwdriver or by holding the brake pedal. After unscrewing the nuts, you need to tie the cardan to the muffler. You can simply hang it, but this can also lead to negative consequences for the cardan.
Remove the axle shafts, because without this the gearbox cannot be removed. At the same time, you can inspect the seals, and if they are worn out, replace them. This will save time and prevent possible malfunctions.
Separate the beam and gearbox by unscrewing all eight bolts that secure it. When unscrewing the latter, it is necessary to hold the gearbox so that it does not fall. The bolts are unscrewed - carefully remove the gearbox.

Repair and adjustment of the VAZ 2107 gearbox

Before you start repairing the gearbox and its subsequent adjustment, you need to have certain skills, backed up by skills, observe all the nuances and subtleties of this process, and also strictly follow the technological nuances of the process. Therefore, if a person starts work for the first time, then it is better to abandon this idea. In addition, you must have all the necessary tools:

pullers;
stands;
a set of keys, screwdrivers and other accessories.

If something is missing, it’s better not to take risks and trust the professionals. In fact, disassembling the “seven” bridge will not be difficult, but it is one of the few components that requires professional maintenance. The gearbox is disassembled step by step:

First you need to unscrew the shank nut;
then the flange itself is removed, the drive gear is pulled out, and the rings responsible for the adjustment are dismantled;
the oil seal is removed, the oil deflector is dismantled, and using a puller, the inner ring of the bearing is removed;
the drive gear is disassembled, and the differential is dismantled, and the spacer sleeve, regardless of its condition, is subsequently changed.

To facilitate subsequent assembly, marks are applied to the bearing caps - you can use a pencil, but it is much more reliable to use a core for this. Marks are applied not only to the covers, but also to the body, this will allow them to be assembled correctly later. As for the right and left covers, they also need to be marked, because they cannot be confused; numbers and letters are applied to the covers and body in the appropriate places. The only inconvenience is that you need to carefully clean the covers so that the marks remain in place - that is why, for convenience, it is better to mark the marks.

In order to remove the cage with inner rings, you must use a hammer and drift. By lightly tapping over the entire surface, the process of knocking out the rings occurs. If you only knock on one point, it is unlikely that you will be able to remove the rings.

As a rule, all gearbox repairs consist of replacing the main pair - it takes the main “blow”. The main pair is responsible for determining the gear ratio, and it is produced in various variations. The increase in traction of the “seven” occurs due to the larger gear ratio, and the lower it is, the higher the maximum speed the car gets. Which pair to choose is up to the car owner himself, but there are some tips on this matter.

VAZ 2107: replacing the rear axle gearbox

VAZ 2107, the last representative of the classics, which was equipped with rear-wheel drive. It had the same structure as its predecessors: gearbox, cardan drive, rear axle, etc. On newer models, VAZ 2108, 2109, 2110, instead of a gearbox, so-called CV joints were installed, which, over a long period of operation, proved to be less durable.

In general, the gearbox is considered one of the strongest mechanisms in a car. But, as they say, nothing lasts forever, and sooner or later, this mechanism will need to be repaired or replaced. So, let's look at the procedure for replacing a VAZ 2107 gearbox with your own hands.

Why does the gearbox break?

The gearbox on the “seven” is very reliable; on many cars it covers both 100 and 300 thousand km. Moreover, not a single repair was carried out during this period. But on some vehicles, gear wear appears much earlier, usually due to improper operation.

Reasons why gearbox gears fail:

The lubricant in the gearbox is not replaced.
Poor quality oil is used. Only high-quality transmission oil must be filled into the rear axle, as well as into the steering gear of the VAZ-2107.
Extreme vehicle operating conditions, heavy loads and frequent slipping.
Insufficient amount of lubricant in the gearbox.

In other words, if you monitor the condition of the VAZ-2107 gearbox seals, the oil level, and most importantly, do not allow excessive loads on the drive, then the mechanism will last for many years.

Device

The gearbox is one of the main mechanisms included in the design of the rear axle. It is responsible for transmitting torque from the gearbox to the drive wheels. His device includes:

Two main gears: drive and driven;
An axis with satellites located on it;
Axle gear;
Locking plate;
Differential box;
Adjustment screw;
Carter;
Gearbox housing.

It is worth noting that all the parts of this mechanism are basically in constant motion and are subject to heating. It is for this reason that they require special equipment and operating conditions, otherwise you will need to replace this unit very immediately.