How many teeth are there on the VAZ classic gearboxes?

It is known that the engine has maximum power, and therefore maximum torque, in a certain speed range, but it is not distributed evenly over the entire tachometer scale. In order to “catch” all the power and transform it for various driving conditions, a box is needed. Its structure is quite complex.

All the power of the torque is transmitted to the drive wheels through the transmission, which for the VAZ 2107 consists of the following parts:

• clutch (its task is to connect the engine input shaft to the gearbox, or to disconnect it;
• the gearbox itself (gearbox), its task is to distribute torque from the engine to the wheels at the driver’s request;
• a system of drive shafts that finally transmit rotation to the wheel drive.

Experienced auto mechanics know that of two cars, the faster one can be the one with the weaker engine, if its gearbox ratios are selected correctly.

VAZ gearbox device

gear ratio of main gears of VAZ gearboxes

You can install any one in the rear axle gearbox of VAZ rear-wheel drive vehicles, regardless of the car model.
The only exceptions are all-wheel drive VAZ models (Niva and its modifications). Regarding the latter, the rule is true: when repairing a gearbox (front or rear separately), it is necessary to ensure that the gear ratios of the main gears of both gearboxes match. Failure to comply with this rule will inevitably lead to breakage of the main gear teeth of one or both gearboxes immediately after the start of movement. Currently, main pairs with the following gear ratios are on sale: 3.9; 4.1; 4.3. The greater the gear ratio of the main pair, the correspondingly greater the power of the gearbox. On the contrary, the lower the gear ratio of the main pair, the faster the gearbox. The gearbox of the VAZ 2102 car had the best power characteristics, but with the departure of this model from the assembly line, the main pair with a gear ratio of 4.44 also fell into oblivion.

If you are just preparing to repair a gearbox and you are faced with the task of purchasing a main pair, but you do not know which main pair and with what gear ratio is installed in the gearbox of your car, you can use the following method to obtain the data necessary for purchasing (it is better to perform the operation described below with an assistant):

We hang up one rear wheel of the car and place it (the car) on reliable stands. Set the gear shift lever to the neutral position and completely release the handbrake, thereby ensuring free rotation of the wheel.

We rotate the raised wheel, while counting its revolutions and the revolutions of the propeller shaft. To obtain the most accurate data, you need to make 10 revolutions of the wheel.

By counting the revolutions of the wheel and driveshaft using the table below, we determine the gear ratio and, accordingly, the model of the main pair. If during repairs a non-original main pair is installed in the gearbox, with a different gear ratio, then the speedometer readings (speed and distance traveled by the car) will change when driving.

And the last thing I wanted to especially note when concluding the chapter on main gears: hypoid gearing has large longitudinal slip, which significantly worsens the lubrication conditions during operation of the gearbox. These circumstances, in turn, put forward corresponding requirements for the strength of the created oil film, and therefore a more serious approach when choosing a particular brand of transmission oil for filling into the gearbox. Currently, during their manufacture, main gears are subjected to a special chemical treatment - phosphating. This allows the use of less viscous oil for operation, while avoiding sticking and, possibly, welding of gear teeth. This is especially true during the most dangerous period, when their mutual grinding and running-in occurs.

With a lot of their advantages, hypoid gears (main pairs) require special attention with regard to heating. The normal operating temperature of the main pair fluctuates during gear operation in the range of 90-95 degrees. Of course, the temperature range shown is typical for average driving conditions. During a long trip and, especially, in hot weather, the temperature of the main transmission can significantly overcome the barrier of 100 degrees.

Based on the above, the following rule follows: after repairing the VAZ gearbox, it is necessary to monitor the heating of the unit. To do this, drive at a speed of 60-70 km/h for 20-30 minutes. You should check the heating of the gearbox in the area of ​​the neck of its crankcase, which, in turn, should not exceed 90-95 degrees. The heating of the gearbox is checked like the heating of an iron: the water entering the test zone should not boil.

Transmission malfunctions

The box on the seventh model Zhiguli is considered a reliable unit. If you maintain it regularly and treat it with care during operation, then repairs will not be needed for a long time. However, all components and parts are subject to wear. There are many reasons for this. In any case, if a malfunction is detected in the gearbox, it is necessary to carry out diagnostics and repairs.

Most malfunctions occur of the following types.

One of the gears does not engage

Without opening the box, we can assume that:

Knocks out gear when driving

It happens that when you turn on a gear, it does not turn off randomly. Possible reasons:

Crunching and grinding in the box while driving

This problem appears for the following reasons:

Grease leaking from box

The gearbox is designed so that lubricant cannot leak out spontaneously. But if an oil stain has formed under the car, an inspection should be made and the leak eliminated.

The reason may be:

Rear axle

How much does the engine from a VAZ 2109 weigh?
Rear axle in section

Description of design

The rear axle of the car is made in the form of a hollow beam, to the ends of which flanges with seats for axle shaft bearings and holes for attaching brake shields are welded. In the middle, a main gear reducer with a differential is bolted to the beam, and on the flange side, two axle shafts are inserted into the beam, transmitting torque from the gearbox to the rear wheels. The rear axle of all “classic” VAZ cars (except all-wheel drive models) is unified and, depending on the model, can be equipped with a gearbox with a gear ratio of 3.9 or 4.1.

The drive and driven gears of the gearbox are selected in pairs and if at least one of them is damaged, they are replaced as a set. The drive gear is mounted on two tapered roller bearings, and an elastic spacer sleeve is inserted between their inner rings. When the nut on the pinion shank is tightened, this bushing is deformed, providing preload to the bearings. An adjusting ring is installed between the drive gear and its bearing, which determines the axial position of the drive gear. The final drive gear is bolted to the differential housing, which is mounted on two tapered roller bearings. The preload in these bearings, as well as the amount of clearance between the teeth of the drive and driven gears, are adjusted by ring nuts screwed into split bearing beds. Inside the differential housing, two satellite gears sit freely on the axle and mesh with the semi-axial gears. The axle shaft with its inner end enters the splined hole of the semi-axial gear, and with its outer end it rests on a ball bearing, which fits into the flange of the beam and is locked there by a plate. The plate, together with the oil deflector and the brake shield, is secured with four bolts to the beam flange. A cuff is installed in the bridge beam socket. The bearing is secured against axial displacement on the axle shaft by a locking ring. Do you think you know everything about sex? Prostitutes of Krasnoyarsk will be able to pleasantly dissuade you of this. Sex can be absolutely amazing when you leave it in the hands of a professional! The prostitute will be as you wish - obedient or daring, domineering, shameless, but in any case, a very sexy prostitute in Krasnoyarsk. Choose a girl in the catalog of prostitutes, because the most beautiful and exciting whores of Krasnoyarsk are collected here. All photographs and descriptions are real - the site administration checks the content before posting and periodically after posting. The brake pads, the brake cylinder with the brake fluid supply tube and the parking brake cable sheath are attached to the brake shield. The brake drum is attached to the axle flange with two guide pins. For filling and draining oil, two plugs with conical threads are installed.

Transmission repair

If one of the faults is detected, the box should be repaired to prevent its complete failure.

Before repairs, you need to prepare a place, tools, washing liquid, preferably kerosene, rags, boxes for small parts.

It is better to remove the gearbox on an overpass or pit.

Preparing tools

When removing and repairing the gearbox, you will need the following tools:

Removing the box from the car

Before dismantling the gearbox, it is necessary to place the car on an overpass and support the wheels so that it does not move. Disconnect the negative terminal on the battery or turn off the ground, if any. Drain the transmission oil.

Next in order, in the cabin:

It is better to remove this unit with two people, as its weight is 23 kg. The removal option can be seen in the video:

Disassembling the box

Before disassembling the box, it must be thoroughly washed with kerosene or white spirit.

It is better to do disassembly on a workbench with a sufficient countertop area, with boxes nearby for storing small parts.

When working, you need to be careful and remember what is where, because you still have to assemble it.

The process of disassembling the box is shown in the video. The master shows and tells how to do this from start to finish:

Bearing change

One of the frequent and serious malfunctions of the box is wear of the bearings. These parts are designed in such a way that they cannot be repaired. Therefore, they are replaced with new ones of the same brand.

There are four types of bearings installed in the Zhiguli gearbox. Each shaft has its own, different in design and size.

The process of removing bearings is shown in detail in the video in the chapter “disassembling the box”. The input shaft bearings can be changed without disassembling the gearbox.

How to change the input shaft bearing is shown in this video, using the example of a Niva box:

Which gearbox to choose: 2103 or 2106

How many kilometers to break in a new car? How long should a car break-in take?

In the “nature” of Zhiguli gearboxes there are 4 types:

• VAZ 2101 - gear ratio 4.3
• VAZ 2102 - 4.4
• VAZ 2103 “troika” - 4.1
• VAZ 2106 “six” - 3.9.

The gear ratio is the ratio of the teeth, for example, in a “six” gearbox the large gear is marked 2106 1143. Therefore, to determine the pair, 43/11 = 3.9 is necessary. The larger the number of the pair, the more high-torque the car will be, but it will lose maximum speed. Most often, you can find two types of gearboxes in stores: with a pair of 4.3 and 3.9.

Work order:

• We hang up the rear axle, drain the oil from the crankcase, remove the wheels and brake drums, and remove the axle shafts. We disconnect the driveshaft from the drive gear flange and move it to the side.
• Using a “13” wrench, unscrew the eight bolts securing the gearbox housing to the rear axle beam.
• Remove the gearbox assembly.
• We install the new gearbox in the reverse order of removal. Apply sealant to the threaded part of the crankcase mounting bolts. After installation, do not forget to fill the rear axle housing with 75W-90 transmission oil. Crankcase volume is 1.3 liters.

Five-speed manual transmission

The seventh model Zhiguli has a five-speed gearbox with five forward speeds and one reverse.

It is made of duralumin and has similar covers on the front and back. The clutch cover is attached to the front of the box using studs. A steel cover is installed on the bottom of the device. There are sealing gaskets between the box body and each lid.

The front cover is connected to the clutch housing using a press fit. There is a hole in it for the input shaft to exit and install the cuff.

Inside the box, shafts with gears, synchronizers and gear shifting devices are installed in a certain order. There is an oil filler hole on the right, and a drain hole with a magnetic plug on the bottom.

At the bottom left of the cover comes the speedometer cable, which is driven by the secondary shaft using a gear.

The gear shift lever is on top. Consists of a gear selection device, rods and a locking mechanism. A handle is attached to the lever on top. This entire structure is attached to the lid using three studs.

Type of gearbox:

Exploded parts:

Moving parts of the gearbox:

Transmission oil for gearboxes

To select gear oil for the Lada gearbox, you need to take into account the region where the car will be operated.

The best oil is synthetic, but semi-synthetic and mineral oils will not harm the Seven’s transmission. The amount of oil in the VAZ 2107 gearbox is about 1.6 liters. The oil change time is carried out according to the instructions in the technical instructions supplied with the car.

Manual transmission oil level

The oil level in the box is checked as follows:

Oil change

It is better to change the oil on an overpass or pit with a warm engine, so the oil will drain faster. Prepare the tool in advance, a container for working out at least two liters, oil for changing.

Replacing gears and synchronizers

The work of replacing gears and synchronizers is one of the most difficult when repairing a gearbox. There is a standard repair kit containing all the necessary parts to help cope with the task. It is advisable to prepare a special tool.

Gears and synchronizers on the primary and secondary shafts are changed in almost the same way.

The process goes like this:

Removing and replacing the fifth gear gear occurs differently.

The video clearly shows and explains how to do this:

Gearbox seals and their replacement

Oil seals in any mechanism where they exist act as gaskets. In this case, they are designed to seal the holes from which the primary and secondary shafts come out. Previously, oil seals were cast from rubber.

Currently made from modern composite materials, more resistant to temperature changes and aggressive environments.

Input shaft oil seal

The oil seal, which is installed on the input shaft, has the following dimensions:

It is installed in the shaft output hole in the clutch housing and serves to prevent lubricant from flowing through the shaft.

There is no difficulty in replacing the oil seal, but the gearbox will have to be removed.

The order of work to change the oil seal is as follows:

Secondary shaft oil seal

The oil seal, which is installed on the secondary shaft, is larger and has dimensions:

It is installed at the output of the secondary shaft at the rear of the box.

The order of work to change the oil seal is as follows.