Removal and installation of the rear axle VAZ 2107 Zhiguli

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.

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.

Changing the oil in the rear axle of a VAZ 2106

Often, car enthusiasts who own a vehicle such as the VAZ 2106 ask the same question. They are interested in which oil fluid is best suited for the rear axle of their car. At the same time, they ask - what volume is needed and how to change the oil?

There are different opinions. But experts recommend filling the rear axle gearboxes of this machine with transmission oil, which is marked 80W90 . For example, this is Lukoil 80W90 GL. This group of oils also includes TAD-17 80W-90 or the so-called TNK.

When we've sorted out the oil, it's time to answer another question. Perhaps he is one of the most important. Namely, how much oil is required? So, the oil volume is as follows - 1.3 liters. At the same time, it is possible to change the oil in the gearbox. True, in this case you will need 1.4 liters.

As for the interval, it is necessary to change the oil fluid after every 30,000 kilometers of the vehicle. If you convert the mileage into a time frame, you get 3 years of operation.

The oil fluid is replaced in accordance with the established procedure:

1. First of all, you need to use a lift or inspection hole. You will also need a key for “seventeen” and a hexagon for “twelve”.
2. Next, unscrew the drain plug in the bridge and place a special container designed for draining the oil fluid. At the same time, the filler plug is also unscrewed. This is necessary so that the oil fluid flows out faster.

We unscrew the drain and filler bolts. When the oil fluid is drained from the bridge, the drain plug is screwed in and new oil is poured. Here you need to use the filler hole. You will also need a special syringe or other suitable tool.

Fill with a watering can

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.

Features of replacing the rear axle gearbox

If you are convinced that such an important unit is faulty, then only replacing the rear axle gearbox of the VAZ 2107 can help out. In principle, this work can be easily done with your own hands:

• Drive the car onto the overpass (you can work in a pit in the garage).
• Place wheel chocks under the wheels (if you don’t have them, you can put regular stone or brick).
• Drain the oil from the gearbox (before doing this, it is advisable to drive the car a little to warm up the lubricant).
• Wait until all the oil has drained from the assembly.
• Remove both rear wheels one at a time and install supports.
• Remove the brake drums and axle shafts (it is better to remove the latter rather than leave it dangling from the car).
• Unscrew the gearbox and cardan.
• Make sure the gasket is intact and, if necessary, treat it with sealant.
• After 10-15 minutes, install a new gearbox and assemble everything in the reverse order.
• Add oil.

Defects in the gearbox

Increased play in the RZM can be formed due to wear of the differential pinion pin - if you grab the driveshaft and rotate it clockwise and counterclockwise, this play can be felt. Also, increased clearance can be formed due to wear of the splines inside the differential housing itself.

If the gaps in the main pair of gearboxes are not adjusted, a characteristic noise occurs when the car moves:

• when the load increases (sharp acceleration), a characteristic howl is heard in the bridge;
• When I let off the gas the noise goes away.

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.

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.

Extraneous noises that arise under the bottom while driving signal the occurrence of troubles with the gearbox “adjacent” to the rear axle. Even timely replacement of lubricant in the axle does not affect the failure of its parts, so replacing the rear axle gearbox of the VAZ 2107 is inevitable. In order to verify whether the “diagnosis” is correct, it is necessary to dismantle the gearbox, disassemble it, if necessary, carry out repair work, reassemble it, reinstall it and configure it. But here's the question...

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:

1. The lubricant in the gearbox is not replaced.
2. 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.
3. Extreme vehicle operating conditions, heavy loads and frequent slipping.
4. 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.

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.

Gearbox diagnostics

In order to finally make sure that there is no problem with the rear axle gearbox of the VAZ-2107, you must perform the following steps:

1. Stop the wheel chocks under the front wheels.
2. The entire rear of the vehicle must be raised using jacks so that the axle is suspended. Be sure to place the machine on supports.
3. Start the engine, then shift into gear and add gas. The main thing is to ensure that the speedometer shows the same speed that you reached while driving.

In the case when, during acceleration without load, extraneous noise still remains, you should understand that there are no problems in the gearbox itself. It is necessary to carefully review all other mechanisms included in the drive design. But if, when there is no load, noise does not come from the gearbox, you will have to repair it. The fact is that when gears wear out, they only make noise under load.

Signs of a malfunction of the rear axle gearbox of the VAZ 2107

The gearbox is a fairly expensive part, and its repair is a labor-intensive and complex process. Therefore, you should first make sure that the cause of the noise is a gearbox malfunction. You can do this as follows:

• Choose a flat section of the road and gradually accelerate on it from 20 to 90 km/h. While driving, you should listen carefully and note the appearance and disappearance of extraneous noise from the rear axle gearbox.
• Release the gas and start braking with the engine. While the speed is decreasing, you should also note the moments when noises appear and disappear.
• Accelerate the car to approximately 100 km/h and, switching to neutral, turn off the engine. While the car is coasting, note the presence and disappearance of noise.

Diagnosis of axle gearbox failures

Gearbox malfunctions manifest themselves by the appearance of strange noise while driving. But the difficulty is that determining the source of extraneous sound is not so easy.

To accurately identify the cause, it is worth conducting a small diagnosis:

Accelerate the car on a flat road to 20-25 km/h and continue to increase speed (it is advisable to do this as smoothly as possible).

At the same time, listen to unnecessary sounds and record at what speed they appear and disappear.

Having accelerated to the desired speed, release the gas and gradually reduce the speed with the engine. Listen again to the moment when the noise becomes louder or disappears altogether.

Most often, extraneous sound in the gearbox should appear and disappear at the same speed;

Accelerate the car to 90-100 km/h and move the gearshift knob to neutral position.

Now turn off the ignition and drive the car (the car should stop on its own).

Pay attention to noises when reducing speed. If during such a test a suspicious sound appeared, then it clearly did not come from the main gear gears.

If there was extraneous noise during the first test, but not during the second test, then the problem is in the gearbox or drive gear bearing;

Stop the car and gradually increase the speed. If noises appear similar to those in the first check, then the problem is not in the gearbox.

If there are extraneous sounds only during the first experiment, and their absence in the second and third, you can safely “sin” the gearbox.

Removing the rear axle gearbox of VAZ 2107

Before removing the gearbox, it is necessary to drain the transmission oil that is poured into the rear axle of the VAZ 2107. To do this, place an oil container under the drain hole of the axle and unscrew the drain plug.

Important: after repair, new transmission oil should be poured into the gearbox.

The next procedure is as follows:

• Unscrew the bolts securing the cardan to the gearbox flange;
• Uncouple the rear part of the cardan and lower it down;
• jack up the car (if it is not on a lift) and remove the rear wheels;
• Unscrew the guide screws of the brake drums;
• remove the brake drums;
• unscrew the 4 bolts securing the axle shafts;
• pull out the axle shafts, freeing the gearbox;
• unscrew the 8 gearbox mounting bolts;
• remove the gearbox.

Removing and installing the rear axle on a VAZ 2107

We remove the rear axle from a VAZ 2107 car to replace it or carry out body work. To carry out the work of removing the rear axle from a VAZ 2107, you will need an assistant.

Removing the rear axle from a VAZ 2107

1. We install the VAZ 2107 car on an inspection hole or overpass (see “Preparation of the VAZ 2107 car for maintenance and repair”). 2. Drain the oil from the rear axle of the VAZ 2107 (see “Rear axle of the VAZ 2107 - checking the level and changing the oil”). 3. We hang up the rear part of the VAZ 2107 (see “Preparing the VAZ 2107 for maintenance and repair”) and remove the rear wheels (see “Wheel of the VAZ 2107 - replacement”). 4. Disconnect the driveshaft from the shank flange of the main gear drive gear (see “Driveshaft of a VAZ 2107—removal and installation”). 5. Place a jack (diamond or hydraulic) under the rear axle gearbox and slightly raise the axle. 6. Disconnect the pressure regulator drive rod from the bracket on the rear axle beam (see “Rear suspension spring - replacement”). 7. Remove the hydraulic brake hose (see “Rear brake hose - replacement”). 8. Disconnect the shock absorbers from the rear axle brackets (see “Rear suspension shock absorber - replacement”).

9. Having lowered the rear axle on a jack, release the springs and remove them along with the upper and lower insulating spacers (see “Rear suspension spring - replacement”). 10. Remove the rear parking brake cable guide from the tip of the front cable and disconnect it from the cable. We remove the ends of the cable sheath from the holes in the body brackets. We remove the two brackets securing the rear cable to the body of the VAZ 2107 car (see “Parking brake system - disassembly and assembly”). 11. Disconnect the transverse rod from the rear axle bracket (see “Rear suspension rods - replacement”). 12. Having disconnected the upper and lower longitudinal rods from the rear axle brackets (see “Rear suspension rods - replacement”), together we remove the axle from the jack.

Installing a rear axle on a VAZ 2107

1. Install the rear axle on the VAZ 2107 in the reverse order.

Attention Before connecting the lower longitudinal torque rods to the rear axle brackets, place the rear parking brake cable above the rods

2. Fill the rear axle with oil (see “Rear axle of a VAZ 2107 - checking the level and changing the oil”). 3. Bleed the hydraulic brakes of the rear wheels (see “Hydraulic brakes - pumping and replacing brake fluid”) and adjust the parking brake (see “Parking brake - adjustment”).

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Repair and adjustment of the VAZ 2107 gearbox

Adjusting and repairing the gearbox requires some skills and careful adherence to technology. It is also necessary to have pullers, stands and special tools. If the above is not the case, you should entrust the work to professionals.

If your qualifications are insufficient, it is better not to start working with the gearbox. Assembly and adjustment work requires fairly high metalworking skills. It is not difficult to disassemble the VAZ 2107 axle, but this is one of the few components of the “Seven” that requires highly qualified maintenance. It is not worth saving on these works.

Disassembling the gearbox is performed in the following sequence:

• unscrew the shank nut;
• remove the flange and remove the drive gear and adjusting rings;
• remove the oil seal, oil deflector, inner ring of the bearing;
• press out the outer rings of the bearings with a puller;
• disassemble the drive gear with the differential (the spacer sleeve in this case must be replaced).

When disassembling the gearbox, it is necessary to put marks on the bearing caps in order to then install them in their original position. To do this, you can use a core (which is more reliable) or a pencil. Marks must be placed on the covers and on the body, so that later during assembly they can be aligned. You should also mark the left and right covers so as not to confuse them.

This can be done this way: on the covers, in addition to the marks opposite the marks on the body, apply numbers or letters with a pencil. The disadvantage of this method is that the marks will be erased when you clean the lid. Therefore, it is safer to simply make marks with a core. For example, one on the left cover and two on the right.

The inner rings with the separator are removed using a hammer and drift. You need to knock out the rings by lightly tapping them in different places. If you hit only one place, you won’t be able to pull out the ring.

Typically repairs consist of replacing bearings or the main pair. These parts most often fail.

The main pair is available in several variations and determines the gear ratio. The higher the gear ratio, the greater the traction; the lower, the higher the maximum speed of the machine. There are three standard versions of the main pair, used on different VAZ models.

VAZ 2107 owners sometimes install the main gearbox pairs with a non-standard gear ratio. To increase traction, pairs are set with a larger value, to increase maximum speed - with a smaller one. If the task is to tune a car, you can take this opportunity to change these characteristics of the VAZ 2107.

Reference: the VAZ 2102 axle had the maximum gear ratio (4.44). After this model was discontinued, finding pairs with this ratio became problematic, but as practice shows, the best option is installation on a VAZ 2107 with a 1.5-1 engine ,6 gearboxes with 2103 (4.1 gear ratio). When choosing this gearbox in conjunction with a five-speed gearbox, traction and speed are maintained.

Repairing the rear axle gearbox of a VAZ 2107 is not always advisable. It is often easier to replace the gearbox with a new one. It is worth considering that the new unit will be more durable than the restored one.

Gearbox repair

When making adjustments and repairs to the rear gearbox, you must have certain skills, as well as follow technology. A mandatory requirement is that you must have special tools, pullers and stands at your disposal. If you do not have all these tools, then it is better to have the rear gearbox repaired by a professional.

If you have never tried to repair rear gearboxes, but really want to do it, it is better to first learn from experienced mechanics. Disassembling the VAZ-2107 axle gearbox is not difficult, but this is a vehicle component that requires very high-quality maintenance. You shouldn't skimp on this.

Adjustment and installation of the VAZ 2107 gearbox

Before assembling the gearbox, all parts must be thoroughly washed in kerosene. They should be inspected before installation. Gear teeth should not be chipped or scored and have the color of metal, and not be covered with a black coating of oil. Minor scuffs on the satellite axle, journal and axle gear seats can be treated with fine sandpaper. If there are large scuffs or large wear, the parts must be replaced.

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).

The gaps between the gears of the gearbox are adjusted using an adjusting ring, the thickness of which is selected individually. For selection, you need a caliper and probes of various thicknesses. The flange nut must be tightened with a torque of 18 kgf-m.

How to remove the gearbox

Before starting the removal procedure, you need to completely drain all the oil that is in the rear axle. To do this, place a suitable container over it and unscrew the plug. Be sure to fill in new oil after all repair work and installation of the gearbox in place.

The repair procedure is as follows:

1. Unscrew the bolts that secure the propeller shaft to the rear gearbox flange.
2. The rear half of the driveshaft must be disconnected and lowered down so that it does not interfere with work. During assembly, tightening is carried out with a torque of 18 kgf/m.
3. Remove the rear wheels.
4. Unscrew the guides that are located on the brake drums.
5. Completely dismantle the brake drums and unscrew the four bolts that secure the axle shaft.
6. Only after this can the axle shaft be pulled out.
7. To dismantle the gearbox, you need to unscrew the 8 bolts that secure it to the rear axle.
8. After all the measures taken, you can completely remove the gearbox from the car.

Be sure to check the condition of the rear axle bearings. If they become unusable, then they need to be replaced.