Dimensions of the rear axle gearbox flange of the VAZ 2107

What to do if the oil seal in the rear axle gearbox leaks? Of course, change it. You can replace it without removing the gearbox. To do this, you need to drain the oil, remove the wheels with brake drums, disengage the axle shafts and disconnect the driveshaft.

Before starting work, you must clearly decide for yourself that everything must be done carefully and according to the instructions. Because the rear axle gearbox is a very complex mechanism that requires considerable experience, knowledge and special tools. It is generally recommended to repair such mechanisms only in specialized establishments. But if you are clearly confident in yourself and your hands, then let's start.

We take a strong nylon thread and wind it onto the cylindrical surface of the flange. We attach the dynamometer and pull it down. At the moment when the flange begins to rotate evenly, we remember the force value on the dynamometer and write it down.

Having written down the values, we proceed to disassembly. We insert two ordinary bolts into the holes of the flange and, having secured them with a pry bar from turning, unscrew the nut with a 27 wrench.

And remove the flange. We inspect it carefully; if there are holes or abrasions on the surface where the oil seal is attached, the flange needs to be replaced. Because when installing a new oil seal, it will quickly fail.

Using sliding pliers, tear out the worn oil seal.

We install the flange and tighten the nut. Now the puff, the most important moment.

And so, back to our recorded dynamometer reading. If the initial indicator was 2.9 - 3.1 kilograms, then the force of the torque wrench is approximately 6.5. A value of 4.3 on the dynamometer corresponds to 9 on the torque wrench. And so on. We tighten it to 6 and check it with a dynamometer as in the first photo. If the indicator is around 2.8 - 3.9 is considered normal. If the value on the dynamometer is 2.8, and the torque wrench indicator exceeds 9, then the spacer sleeve has exhausted its adjusting properties and must be replaced. To replace the adjusting sleeve, the gearbox must be completely disassembled. But if the indicators are normal, we put everything back together and don’t forget to fill in the oil.

On the roads of our country and neighboring countries there are still many cars produced by cars - this is what motorists call the Zhiguli model range - becoming less and less, but to this day all models of this series are popular due to their affordability and service, which in most cases motorists conduct themselves.

Among the “classic” models, the VAZ 2107 car represented a number of luxury cars and was once very popular; its production was discontinued in 2012. Due to the long service life of cars of this model, parts gradually wear out, especially for rubber products, which dry out over time. Diagnosis of oil leakage from the gearbox

The axle gearbox of the VAZ 2107 car is designed to increase engine torque and change angular speeds. It consists of a housing and the gearbox itself, into which the axle shafts are installed. Transmission oil is poured into the main gear housing, which is kept from leaking by the oil seal located at the base of the gearbox shank. The presence of oil stains on the ground under the gearbox and oiling of the gearbox itself indicate a malfunction of the cuff, and the reasons for this may be the following:

Defective product produced by the factory;

Wear of the working edge of the oil seal;

Broken tension spring;

Flange surface wear.

All of the above defects require replacement of the cuff. Only if the oil seal “fogs up” is there no need to replace it, but you should monitor the oil level in the gearbox from time to time.

Replacing the cuff of the VAZ 2107 axle gearbox

To ensure a high-quality replacement of the oil seal on the rear axle main gear shank, you need to know some conditions and rules that must be observed when carrying out repair work carried out independently.

For the convenience of work related to gearbox repair, the car must be placed on an inspection pit (car overpass), and for safety reasons it is better to install special shoes under the wheels. Having prepared the required number of wrenches and sockets, proceed directly to the repair, observing the following sequence of actions:

1. Before removing the cardan, make installation marks on the hinge fork and the end of the gearbox shank flange. Using a socket head and a 13-mm open-end wrench, unscrew the four bolts connecting the propeller shaft and the flange, move the driveshaft to the side and attach it with a rope or wire to the exhaust pipe.

2. Measure the turning torque of the axle main gear reducer shank. This operation is performed using a dynamometer. The hook of the device is hooked to the upper hole and then the dynamometer is smoothly pulled clockwise; at the moment the flange begins to rotate, the value is recorded on the device and remembered.

3. Having inserted bolts into the two nearest holes of the flange, fix the pry bar between them and, using a 27-mm spanner, unscrew the nut securing the flange to the gearbox shank.

4. Using a puller or two pry bars, remove the flange. Examine its working surface mating with the oil seal; if there is severe wear and voids, the flange is replaced with a new one.

5. Using a wide screwdriver, pry the oil seal from the inside and push it out of the gearbox housing. Clean the vacated area from dirt and cuff residues.

6. After dismantling the worn oil seal, a new cuff is installed in its place. To do this, first select a mandrel corresponding to the diameter of the oil seal - usually this is a section of a suitable pipe. Then the cuff is lubricated at the end with any lubricant such as grease, installed in the shank socket and pressed in using an adapter.

7. The final step in replacing the oil seal is to install the flange and tighten it with a locking nut.

Important condition:

Since the nut, in addition to the fixing nut, also performs an adjustment function, it must be tightened using a torque wrench. The tension when tightening the nut should be no more than 60 Nm.

After completing all of the above operations, install the driveshaft in place, aligning the previously made marks.

Although all the work associated with replacing the classic rear axle gearbox seal is not very complicated, it is still better to contact a mechanic about this problem.

It is necessary to replace the shaft seal of the VAZ 2106 when there is an oil leak from under the tail of the gearbox. This breakdown looks like this: drops of lubricant appear on the outside of the surface of the gearbox housing. It sometimes happens that an oil film is mistaken for damage. Only when there are drops on the surface is this an indicator for replacing the rear axle tail seal. You can easily repair such damage yourself.

Necessary tools for replacing oil seals:

If you decide to start replacing the oil seals yourself, prepare the following tools first:

Screwdriver Set;
Set of wrenches;
Hammer;
A small container for oil;
A socket wrench or a 24mm socket;
To unscrew the drain plug, take a hexagon;
Two-jaw puller;
Torque wrench;
To fill the lubricant with a syringe;
Jack;
Body stands.

Important:

All work on replacing oil seals on a VAZ 2106 should be done efficiently. Otherwise, any oversight and carelessness may lead to unpleasant consequences and lead to repair of the axle gearbox. If you doubt your abilities, it is better to contact the service. This way you will protect yourself from unnecessary costs and unexpected car repairs.

The VAZ 2107 gearbox is adjusted, author Nikolay Vladimirovich Zhdankin

Adjusting the VAZ 2107 gearbox on the rear axle...
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. Let's look at the rear axle gearbox...

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.

Disassembling the gearbox and replacing satellites

The satellites are additional gears installed in the differential gearbox. Their purpose is to transmit torque to the axle shafts of the rear wheels. Like any other part, pinion gears are subject to wear. After this, they will have to be changed, since this part cannot be repaired. To restore worn teeth, the car owner has neither the necessary skills nor the necessary equipment. In addition, any gear in a car undergoes a special heat treatment - carburization, which is carried out in a nitrogen atmosphere and strengthens the surface of the teeth to a certain depth, saturating this surface with carbon. An ordinary car enthusiast cannot do anything like this in his garage. Therefore, there is only one solution: purchase a repair kit for the rear axle gearbox. It costs about 1500 rubles. Here's what it includes:

a pair of gears for axle shafts;
a pair of satellites for the differential;
satellite axis;
support washer.

In addition to the repair kit for gearboxes, you will also need a set of regular open-end wrenches, a screwdriver and a hammer.

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.

After marking these parts, they became the “main pair” and are not installed one without the other, that is, “family”. “- 6” is also marked on the “tip”; this is an amendment for assembling the main pair in the gearbox. When troubleshooting a differential, its bearings are also checked for wear and, if necessary, replaced. Bearing wear is often caused by unprofessional replacement of the gearbox seal.

For example, after replacing the oil seal, tighten the shank nut without observing the tightening torque (pull as much as possible) and the force is transferred not to the spacer sleeve, but to the differential bearings.

These are supports on rotating axes and shafts, which receive loads and transfer them to various structures...

As a result, after a short run after replacing the shank oil seal, noise from the gearbox appears. Only in this case, the “hum” noise in the gearbox is constant and unlike the noise from worn teeth of the main gear. In this case, the hum is constant, regardless of whether gas is added or released.

Rear axle gearbox assembly video

Adjusting the gearbox using special devices and control devices...
During assembly, the gearbox is adjusted according to 4 parameters:

1. Selection of the adjusting ring

Parameters from 2.6 to 3.5. The ring serves to adjust the depth of engagement of the teeth of the “tip” and “planetary gear”, which is strictly specified. This is where the “correction -6” is needed for this main pair, which was mentioned above. Of course, this amendment will be individual for each main couple.

In this video, the main pair will be adjusted using a special device. It is clear that the vast majority of motorists do not have such a device and this is just a clear example of adjusting the engagement depth parameter. An option will also be given for adjustment without a “device”.

A “device” with a micrometer is also installed on the device, simulating the gear of the main pair. The indicator shows zero. Then the indicator leg is transferred to the bearing bed and in this case the indicator shows a value of 3.25, which is not good, since it should be within the range of 3.0. On the second landing plane it turned out to be 3.45. The arithmetic mean is 3.3. To adjust, we will use the correction at the “tip” - “-6”. In this case (– 3.3) + (-6) = 3.36. The thickness of the adjusting washer required is 3.36 mm. Using a micrometer, select the washer of the required thickness.

Note. When the shank bearing wears out, it begins to rotate on the “tip” body. As a result, the bearing end, adjusting washer and shank gear bodies wear out. It turns out that when replacing the shank oil seal, even with the correct tightening torque, the adjustment of the depth of engagement of the teeth of the gears of the main pair is lost and the “howl” of the pair is ensured, as is its early failure.

Let's return to the gearbox assembly...

2. Adjusting the preload of the shank bearings

The shank bearing sits on the “tip” and a NEW spacer sleeve MUST be installed. The video clearly shows that the new bushing is smooth without any deformation, while the previously installed one is deformed. What happens is this: When the shank nut is tightened to the prescribed torque (from 12 to 26 kgf), the bushing takes on the tightening force and, when deformed, works like a spring, creating tension. The tightening force for the VAZ 2107 gearbox nut is significant and the shank must be secured against turning.

In the video we see what kind of “device” the master uses. It is necessary to tighten the shank nut until there is no play. When the nut is tightened correctly, the shank should rotate with a resistance force of 0.3-0.4 kg, therefore, the bearing preload is correct. This assembly rule applies to old (used) bearings.

The differential with bearings is installed and secured with covers (tightening torque is about 8 kgf) and the adjusting nuts of the differential bearings are tightened.

3 and 4. Simultaneous adjustment of the thermal clearance of the main pair and the preload of the differential bearings

For these purposes, another “device” with two indicators is needed. Using the adjusting nuts in the video and everything is shown well, we move the planetary gear towards the teeth of the “cone” to achieve the required clearance. Factory clearance adjustment data is from 0.08 to 0.12 mm. However, such a gap is provided for the new main pair (“tips” and “planets”). The gap is checked in 4 planes by turning the gear. The gap for the working main pair after adjustment is 0.13-0.14 mm.

Typical gearbox failures and their causes

The rear gearbox of the VAZ 2107 is a reliable device that is very resistant to mechanical wear. However, over time, parts gradually wear out even in the gearbox. And then the driver begins to hear a characteristic crunch or howl heard in the area of the rear axle or in the area of one of the rear wheels. Here's why this happens:

one of the wheels jammed because one of the rear axle shafts was deformed. This happens extremely rarely, usually after a strong blow to one of the wheels. In this case, the axle shaft is so deformed that the wheel cannot rotate normally. If the deformation is insignificant, the wheel will rotate, but when rotating, a characteristic howl will be heard coming from behind the damaged wheel. It is not possible to fix such a breakdown on your own . To straighten the axle shaft, the driver will have to contact specialists;
crunching sound in the gearbox when the car is moving. This is a more common problem that every driver of an old “seven” will face sooner or later. The gearbox begins to crunch after several teeth and splines on the axle shafts wear out in the main gear. If the wear is very severe, the teeth may break. This happens both due to metal fatigue and due to poor lubrication of the gearbox (this is the most likely reason, since the lubricant in the “seven” gearbox often escapes through the breather and through the shank flange, which have never been leak-tight). In any case, such a breakdown cannot be repaired, and gears with broken teeth will have to be replaced;
bearing wear on the axle shaft. This is another reason for the characteristic grinding noise behind the wheel. If the bearing has collapsed, then you cannot drive such a car, since the wheel may simply fall off while driving. The only solution is to call a tow truck and then replace the worn bearing. You can do this either on your own or at a service center.

If the bearing on the axle shaft is worn out, the vehicle cannot be operated.

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.

Rear axle gearbox design of a VAZ-2107
If the axle is noisy both in neutral and at speed, 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).

Purpose and principle of operation of the gearbox

The rear gearbox of the “seven” is a transmission link between the axles of the rear wheels and the engine. Its purpose is to transmit torque from the engine crankshaft to the rear wheels while simultaneously converting the rotation speed of the axle shafts.

Rear gearbox - transmission link between the engine and the rear wheels of the “seven”

In addition, the gearbox must be able to distribute torque depending on the load applied to the left or right wheel.

Principle of operation

Here are the main stages of transmitting torque from the motor to the gearbox:

the driver starts the engine and the crankshaft begins to rotate;
from the crankshaft, torque is transmitted to the car’s clutch discs, and then goes to the input shaft of the gearbox;
when the driver selects the desired gear, the torque in the gearbox is transferred to the secondary shaft of the selected gear, and from there to the driveshaft connected to the gearbox with a special crosspiece;
the cardan is connected to the rear axle gearbox (since the rear axle is located far from the engine, the “seven” cardan is a long rotating pipe with crosses at the ends). Under the action of the cardan, the main gear shaft begins to rotate;
rotating, the gearbox distributes torque between the axle shafts of the rear wheels, as a result the rear wheels begin to rotate.

Differential device

Adjustment and installation of the VAZ 2107 gearbox

Main pair engagement depth adjustments

In this case, it is necessary to select the thickness of the adjusting washer.

So: Instead of the device, we install the “original” shank and tighten the nut until it stops lightly, leaving a gap. The differential with planetary gear assembly, bearing caps are installed and their mounting bolts are tightened.

When replacing the shank oil seal, a number of incorrect actions are allowed, which ultimately lead to premature failure of the gearbox. Before releasing the shank nut, according to the technology for performing the work of replacing the oil seal, it is necessary to remove the axle shafts (which is almost never done, since the amount of work will increase many times). Although according to the price list, the removal of the axle shafts will most likely be included in the list and a fee will be charged for this, since this is required by the plant’s technology for replacing the oil seal. This is a necessary condition, since the axle shaft will create resistance when tightened and correct adjustment will simply be impossible to achieve.

Before releasing the shank nut, it must be secured against turning and the tightening force of the nut must be checked with a torque wrench, around 12 kgf. Before installing the oil seal, if its outer surface is not rubberized, then you need to use a sealant to guarantee it. Thus, a mark of 0.15 mm on the gearbox stocking will be sufficient to pass oil through the outer surface of the oil seal.

The adjusting nuts are installed, and the gap on the main pair is pre-selected (the final working gap is 0.08 to 0.12 mm). Then paint is applied to the teeth of the planetary gear from an aerosol can and, using a shank, it is necessary to make several movements in different directions in order to fix the contact spots in the paint.

Now, having turned the planet gear back, you can clearly see the contact patch on its teeth with the teeth of the pin. The contact patch (in this case) shows that the adjusting washer on the shank is thicker than the required thickness. We slightly tighten the shank nut, thereby moving its bearing, which makes it possible to move the gear teeth towards each other, that is, as if “reducing” the thickness of the adjusting washer. Using the differential bearing adjusting nuts, we set the approximate gap (reducing it slightly).

Then we again apply paint to the teeth of the planetary gear and again begin to rotate the shank (or gear) in different directions to print the contact patch between the teeth. It can be seen that the contact patch has risen a little, but still not enough and it is necessary to tighten the shank nut a little again. Similar actions with paint and turning the gear must be carried out until the contact patch is located exactly in the middle of the teeth, and the sound of the turning teeth becomes quieter.

After correct (final) adjustment, the sound will be almost inaudible.

Remember to tighten the differential bearing adjusting nuts every time you tighten the shank nut. As a result, the contact patch was located exactly over the entire surface of the teeth. It should be noted that this is the condition for the location of the contact patch for old (working) pairs. For new main pairs, the contact patch, as mentioned above, should be located in the center of the teeth.

Further. The planetary gear mounting covers are released and the differential is removed. The shank nut is unscrewed and removed. Since the shank was installed only with a bearing without an adjusting washer, there was a gap between the bearing and the shank gear where the washer would fit. This gap is measured with a set of feeler gauges, thereby calculating the required thickness of the adjusting washer.

It turns out, as in the case of using instruments and accessories, the size for the required adjusting washer was also 3.36 mm. The shank bearing is removed, an adjusting washer (3.36mm) is installed, the bearing is put in place and the gearbox is assembled. The shank is installed, the shank nut is tightened, min. 12 kgf. The differential with planetary gear is installed, the covers and bolts are tightened, but not completely.

By the way, the lids should not be mixed up. The adjusting nuts of the differential bearings are installed and the gap on the main pair is pre-set. Then the differential cover bolts are finally tightened. The gap in the main pair is finally adjusted and the adjusting nuts are secured.

The gearbox parts are assembled in the reverse order of disassembly. You can press in the bearing rings using a hammer and a special tool (a socket wrench head will do).

Adjusting the VAZ 2107 gearbox

Correct assembly

When using old parts, only the oil seal and spacer sleeve are changed. When replacing elements of the main pair, it is necessary to use a new spacer washer for the shaft gear and bearing. The washer is selected according to the size, which can be found on the shaft itself. The adjustment ring is mounted and pressed with an attachment onto the inner bearing race.

Requires installation of a spacer sleeve. It is placed in the crankcase. A new oil seal is installed. Next, put on the flange and tighten everything with a new nut. When installing new bearings, the nut must be tightened with a force of 16-200 kgf meter. After running-in, the force will drop to 6. When using old bearings, tightening occurs in the same way as the oil seal.

The differential is assembled and installed in place. If the semi-axial gears had axial play, then thickened washers are installed. After this you can screw on the lids.

A specialized wrench is made to adjust the bearings.

The main pair is adjustable. The nut must be tightened from the main gear until the gap disappears. The shtangel will help measure the gap.

Then the second nut is tightened and tightened a couple of teeth. The first nut has a gap of 0.08-0.13 mm. It will be noticeable if you pick up the gear: a faint knock of teeth will appear.

While controlling the gap, slowly tighten both nuts until they increase by 0.2 mm. This ensures that the bearings are tensioned correctly.

Next, the gear is turned by hand and backlash is tested. If it is the same in different positions, then locking plates are installed, tightened with bolts. If this is not the case, then they say that the differential box is deformed, and therefore it needs to be replaced.

Checking the serviceability of the shank oil seal

The first sign that it is necessary to replace the shank oil seal on a VAZ 2107 is the presence of traces of lubricant, dust and dirt on the outer part of the rear axle. Determining the presence of leaks on the rear axle is not difficult. To do this, you need to climb under the car and inspect the bridge.

If the oil seal is worn significantly, a puddle of oil may be found under the car. If the problem is not resolved in a timely manner, oil may leak out of the bridge, which will lead to its rapid breakdown. Despite the fact that the cuff is a small part in a car, its serviceability plays a very important role.

“Quiet, the operation is underway!” or Replacing the rear axle gearbox seal on a VAZ 2107

The sequence of work when replacing the gearbox seal is as follows:

We measure and record the moment of resistance to rotation of the flange (the axle shafts must be removed!).
Unscrew the flange nut.
Remove the flange from the shaft splines.
Using expansion pliers, remove the oil seal. If you don't have pliers, you can pry it off with a screwdriver. Be careful not to damage the surface of the socket.
We inspect the flange. If its surface has a pronounced groove in the place where the working edge of the oil seal rubbed, then before installing the new oil seal, insert a washer 1 mm thick into the socket. If the flange is damaged on the working surface, replace it with a new one.
Lubricate the outer surface of the oil seal with lithol and carefully drive it into the crankcase socket using a mandrel of suitable diameter. If there is no mandrel, press in the oil seal by evenly tapping the end along the circumference of the outer diameter. Make sure that there are no distortions - the working edge should be strictly perpendicular to the shaft axis.
We inspect the lead-in chamfer on the flange. It should not have defects that could damage the working edge. We install the flange, avoiding sudden movements and impacts, so as not to knock the spring off the oil seal. Before installation, you can lubricate the flange chamfer with transmission oil to make the process easier.
We tighten the nut, periodically checking the moment of resistance to rotation of the flange. Remember that at the end of the tightening the resistance in the bearings increases much more intensely than at the beginning. The moment of resistance to rotation should be 1–2 kgf.cm greater than what we recorded before unscrewing the nut. In any case, if the moment exceeded 9 kgf.cm, and the bearings in the bridge were still old, remove the flange again, take out the inner ring of the bearing and change the spacer sleeve. If the bearings are new (new means they have not traveled a single kilometer, because after a hundred kilometers they can be considered old for adjustment purposes), then the normal moment of resistance to rotation after tightening the nut for them should be in the range of 16–20 kgf. cm. Replacement of the rear bearing affects gear alignment, so please refer to the appropriate instructions for this procedure.

To prevent self-loosening, the flange nut has a special plastic insert, which, when crushed against the thread, creates additional resistance both when screwing and unscrewing. As a rule, such nuts can withstand up to ten unscrewings without losing their locking properties. If in doubt, get a new nut.

We reinstall the axle shafts and brake drums, screw on the driveshaft, and fill in the oil. We make a test drive and if everything is in order, we enjoy life, until we suddenly find a treacherous spot under the bridge again...

How to remove the shank oil seal on a VAZ 2106:

To make it convenient to change the tail seal, place the car in an inspection hole or on an overpass. Pre-prepare new tail seals. The old oil seal has a worn appearance and excess oil. It must be removed immediately. To do this, proceed with the following steps:

Unscrew the drain plug on the gearbox housing using a hexagon. Here you need to place a container for oil;

Wait until the lubricant has completely drained from the gearbox. Screw the plug back in;

Disconnect the reverse drive gear flange and the driveshaft;

Put the car on the handbrake;

Using a
24mm
, begin to unscrew the nut that holds the tail flange.

It is not necessary to use a hand brake to prevent the flange from rotating.

Insert several bolts into the hole in the final drive gear flange;

Using special tools, try to hold the flange by these bolts. At the same time, unscrew the nut;

Take a two-jaw puller and use it to remove the tail flange from the splines;

If you do not have a puller, remove the flange by hand. This will require some effort, but it is not difficult to remove;

10)

Remove the washer and flange from the tail of the main gear at the same time as the dirt deflector;

11)

Take a flathead screwdriver and pry off the seal. Remove it from the hole in the gearbox housing using a bracket. The oil seal has been removed and you can begin replacing.

Important

Note: Before installing a new tail seal, you should check the surface of the flange that directly contacts the seal. It must be undamaged and free of rust. If any defects are found, eliminate them by polishing the surface.

Self-locking differential

The most common way to increase a car's cross-country ability is to install a self-locking differential. The main advantage of this device is that it prevents wheel locking “forever”. This is important because preventing lockup from engaging when not required helps protect the axle shafts from critical loads.

There are the following types of differential locks:

Disc - implemented through the use of friction clutches. These clutches come into action as soon as the wheels begin to rotate at an uneven speed. The disadvantage of this mechanism is that it requires the use of expensive gear oil, and also requires quite frequent adjustment work to set up the unit. This is far from the best mechanism for a VAZ 2107 car.
Viscous coupling blocking - the operation of such a device is based on the use of sticky discs immersed in a special liquid. It hardens when heated, allowing the gears to engage—that is, the differential locks. The liquid heats up when the angular speed of the wheels on the axle changes (when the speed of rotation of the wheels becomes different). The disadvantage of this mechanism is that they require complete sealing of the assembly, and work effectively only during short-term slipping.
Screw locking or worm locking is the best option for automatic locking for the VAZ 2107. The mechanism is implemented using worm screws, which rotate when the car drives in a straight line, and when the angular speed of the wheels changes, they shift into grooves, thereby locking the differential. As soon as the car gets out of the mud captivity, the blocked mechanism resumes its normal operation by moving the worm screws to their places.
Planetary - the operating principle is similar to a worm circuit, only instead of gears, balls are used. Due to the balls, the wheels are blocked, and they come into operation when the traction force between the engines and the axle changes. Compared to a self-locking worm gearbox, a planetary gearbox costs about 2 times less.

In addition to automatic differential locking, there is also a forced one, which is activated if necessary.