Rear axle VAZ 2107: design and repair, replacement of the shank oil seal, instructions with photos and videos

The rear axle is a fairly reliable unit of the VAZ 2107, but despite its massive appearance, the mechanism requires regular maintenance, without which it can fail prematurely. This unit can serve for quite a long time if it is operated correctly and carefully, if possible avoiding extreme driving conditions of the vehicle. Calm and careful driving without sharp pressing of the gas and brake pedal, hard clutch engagement and similar overloads will contribute to the serviceability and durability of the rear axle.

Specifications
What is the rear axle made of?
Frame
Gearbox
Half shafts

Symptoms of a problem

Grinding noise when moving

The cardan spins, but the car does not move

Oil leakage from the housing and from the shank side

Wheels are stuck and won't rotate

Rear axle repair

Shank bearing

Axle bearing

Shank seal leak

Shank play

Video: we measure the shank play ourselves

Checking the oil in the gearbox

Video: changing the oil in the gearbox yourself

Functions of the rear axle VAZ 2107

The seventh VAZ model completes the line of rear-wheel drive cars produced by the Volga Automobile Plant: all subsequent models, starting with the VAZ 2108, were equipped with front-wheel drive or all-wheel drive. Thus, the torque from the “seven” engine is transmitted to the rear wheels through other transmission elements. The rear axle is one of the components of the transmission, including the differential and final drive . The differential serves to distribute torque between the axle shafts of the rear wheels when the car turns or moves on an uneven road. The main gear amplifies the torque, which is transmitted to the axle axle shafts through the clutch, gearbox and cardan shafts. If the resulting torque is taken as 1, then the differential can distribute it between the axle shafts in a ratio of 0.5 to 0.5 or in any other ratio, for example, 0.6 to 0.4 or 0.7 to 0.3. When this ratio is 1 to 0, one wheel does not rotate (for example, it fell into a hole), and the second one slips (on ice or wet grass).

The seventh VAZ model completes the line of rear-wheel drive cars produced by the Volga Automobile Plant

Article: 21010-2401050-00, additional articles: 21010240105001, 2101-2401050-01

Order code: 003040

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Today, the next article in the series “Crystal VAZs or typical breakdowns of domestic cars” is dedicated to the “classics”: VAZ-2101, 2103, 2104, 2104, 2105, 2106 and 2107. These cars have been driving along our roads for decades and, despite Despite all the shortcomings that we will talk about, their popularity is still high.

The series of articles 'Crystal VAZs or typical breakdowns of domestic cars' introduces car enthusiasts to typical faults that arise when operating AvtoVAZ cars. This article is dedicated to the favorite of hunters and fishermen - “Niva”.

What is the rear axle made of?

The design of the rear axle of the “seven” includes a fairly large number of elements, including:

Brake drum mounting bolts.
Guide pins.
Axle bearing oil deflector.
Brake drum.
Drum ring.
Rear brake cylinder.
Brake bleeding fitting.
Axle bearing.
Bearing lock ring.
Bridge beam flange.
Stuffing box.
Spring support cup.
Bridge beam.
Suspension bracket.
Axle guide.
Differential bearing nut.
Differential bearing.
Differential bearing cover.
Breather.
Satellite.
Driven gear of the main gear.
Left axle shaft.
Axle gear.
Gearbox housing.
Drive gear adjusting ring.
Spacer sleeve.
Drive gear bearing.
Stuffing box.
Mud deflector.
Flange-fork of the cardan joint.
Screw.
Oil deflector.
Main gear drive gear.
Axle of satellites.
Axle gear support washer.
Differential box.
Right axle shaft.
Axle shaft brackets.
Axle bearing thrust plate.
Rear brake shield.
Rear brake pad.
Friction lining.
Axle shaft flange.
Locking plate.
Bearing cover mounting bolts.

The rear axle consists of the components of axle shafts, gearbox and final drive

Frame

All working mechanisms of the rear axle are located in the beam, as well as in the gearbox housing. The beam is made of two casings connected by longitudinal welding. The bearings and seals of the axle shafts are located in flanges at the ends of the beam. In addition, the suspension fastening elements are welded to the beam body. In the middle the beam is widened and has an opening in which the gearbox housing is fixed. A breather is installed in its upper part, through which the connection between the bridge cavity and the atmosphere is maintained, so that the pressure in the cavity does not rise above the permissible level and dirt does not get inside the part.

All working mechanisms involved in transmitting torque are located in the axle beam and gearbox housing

Gearbox

The main gear consists of drive and driven gears that have hypoid gearing, i.e. the axes of the gears do not intersect, but intersect. Thanks to the specific shape of the teeth, simultaneous engagement of several of them is ensured and, as a result, the load on the teeth is reduced and their durability increases . A two-satellite bevel differential, in addition to the satellites located on a common axis, includes a box and two gears, while the satellites are in constant mesh with the gears.

The rear axle gearbox of the VAZ 2107 contains a differential and final drive

Half shafts

The “Seven” is equipped with so-called semi-balanced axle shafts of the rear axle, which take on bending forces in both the horizontal and vertical planes. The axle shaft, in essence, is a shaft made of 40X steel, with splines on the inner end and a flange on the outer end. The inner end of the axle shaft is connected to the differential gear, the outer end is located in the flange of the beam, to which the brake drum and wheel are attached. The axle shaft is held in place by a thrust plate of the bearing, which is also fixed to the beam.

The VAZ 2107 is equipped with semi-balanced axle shafts of the rear axle, which take on bending forces in both horizontal and vertical planes

Design and principle of operation

The rear axle of the VAZ 2107 consists of two parts: a driveshaft and a rear axle with a gearbox. Cardan – consists of two axle shafts with a movable joint. It is located under the bottom, along the entire body, from the gearbox to the gearbox. It rotates together with the gearbox gears, and when the rear axle moves up or down, the cardan also changes its position in order to ensure further rotation of the rear wheels.

Gearbox - consists of a metal casing in which two gears are located. One of them is located at the end of the driveshaft, perpendicular to the second, located on the rear axle beam. They have a diagonal cross-section, which allows them to come into contact with each other, thereby ensuring the transmission of rotation.

Since a gearbox is a device in which parts constantly move and, accordingly, heat up, it must have a liquid inside it that provides lubrication of the rubbing parts and removes heat from them. Typically, this fluid lasts for quite a long time, and is replaced very rarely. This stability of the beneficial properties of the oil is ensured by maintaining the correct atmospheric pressure inside the rear axle gearbox, which is provided by the “breather”.

Gearbox for rear-wheel drive models

The “breather” consists of two parts: a glass, inside of which there is an elastic balloon. It is he who connects the gearbox to the crankcase.

In addition to the two main gears, the gearbox includes two pulleys responsible for rotating the left and right rear wheels. At this point, the structure and operating principle of the rear axle are completed.

Symptoms of a problem

As soon as the driver notices any changes in the operation of the rear axle (for example, extraneous sounds appear that were not there before), he must respond to these changes as quickly as possible so as not to aggravate the possible malfunction. The most typical sign of such problems may be increased noise levels:

coming from the rear wheels;
during operation of the rear axle;
when accelerating the car;
when braking with the engine;
during engine acceleration and braking;
while the vehicle is turning.

In addition, a knocking sound when the car starts moving and an oil leak may indicate a malfunction of the rear axle.

Oil leakage indicates a malfunction of the rear axle of the VAZ 2107

Grinding noise when moving

The causes of a grinding noise from the rear axle when the vehicle is moving can be:

wear or destruction of axle or differential bearings;
deformation of the beam or axle shafts;
incorrect adjustment, damage or wear of gears or bearings of the gearbox and differential;
wear of the spline connection with the semi-axial gears;
incorrect adjustment of the gear teeth of the main gear;
insufficient amount of oil.

The cardan spins, but the car does not move

If the driveshaft rotates while the vehicle is stationary, the cause may be a failed axle spline or wear on the teeth of the differential or final drive gears. In any case, if the cardan spins, but the car does not move, this indicates a fairly serious breakdown and, most likely, replacement of the axle shafts, bearings or gears will be required.

Oil leakage from the housing and from the shank side

The most likely causes of oil leakage from the rear axle housing:

wear or damage to the drive gear seal;
wear of the axle shaft seal, determined by oiling of the brake shields, drums and pads;
loosening the bolts securing the rear axle gearbox housing;
damage to sealing gaskets;
axial play of the shank;
breather jamming.

Wheels are stuck and won't rotate

If the rear wheels are jammed, but the drum and pads are in order, the cause of this malfunction may be failure of the bearings or the axle shaft itself. Most likely, in this case, the bearings have crumbled or the axle shaft has become deformed (for example, due to an impact) and the parts need to be replaced.

A little leaked oil from the axle through the axle seal + dust from the pads = good “glue”. Bottom line: remove the drum and look. If all the springs are in place and the block is not torn, then take sandpaper and clean the drum and shoes. Pre-wash them with carburetor cleaner or similar liquid. Sold in cylinders.
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Checking the oil in the gearbox

For the rear axle gearbox of the “seven”, semi-synthetics with viscosity parameters 75W-90 are suitable, for example:

CASTROL Syntrans Transaxle 75W-90 API GL-4;
"Lukoil 80W90 GL-5" and others.

1.35 liters of oil is poured through a special filler hole on the gearbox housing. If you need to drain the used oil, there is a drain hole in the bottom of the gearbox for this purpose. Before draining the old oil, it is recommended to warm up the car, place it on a flat surface and jack up the right side of the car . If there are metal shavings in the waste, you should rinse the gearbox container with a special liquid or spindle oil.

For the rear axle of the VAZ 2107, CASTROL Syntrans Transaxle 75W-90 API GL-4 oil is suitable

It is convenient to fill in new oil using a special syringe, which can be purchased at a car store. Both plugs (drain and filler) should be securely tightened, and then check the condition of the breather, which should move freely. If the breather jams, the contact of the container with the atmosphere will be disrupted, which will lead to an increase in internal pressure, damage to the seals and oil leakage. The oil level in the rear axle gearbox is considered normal when the liquid reaches the lower edge of the filler hole.

Video: changing the oil in the gearbox yourself

Repairing and adjusting the most critical components of the rear axle, as a rule, requires some practice, so it is best to perform it under the guidance of an experienced specialist. If you hear extraneous sounds from the rear axle while driving, you should immediately determine the cause of their occurrence. By ignoring such noises, you can “start” a breakdown and subsequently face complex and expensive repairs. Following simple rules for operating and maintaining the rear axle will extend the life of the vehicle for many years.

How to properly inspect a suspension

Despite the fact that the dependent rear suspension on the VAZ 2107 is particularly wear-resistant, drivers should still closely monitor its condition (especially if you often drive on bumpy roads). To do this, you just need to drive the car onto a lift or use a pit. All damage according to the site mashinaa.ru and malfunctions will immediately catch your eye.

Particular attention should be paid to the following points:

wear of rubber elements;
gaps between car parts;
traces of oil leaks on telescopic shock absorbers;
the rubber bushings of the rods must be motionless, that is, have no play;
If the bushings are very loose, the rods must also be replaced.

Since the rear suspension axle device is supported only by rods and holes located on the bottom of the shock absorbers, the maneuverability and behavior of the car depend on its condition. If you replace the necessary elements in a timely manner, your VAZ 2107 car will serve you faithfully for many years.