Rear wheel bearing for VAZ-2108: dimensions

The wheel bearing ensures uniform rotation of the wheel around its own axis. Of all the elements of the car's chassis, it is the first to meet and distribute shock loads, so the main requirements for this part are strength and durability.

In this article we will talk about what a rear wheel bearing is on a VAZ-2108. We will look at the design of this device, its dimensions, and also understand the process of replacing it.

Design Features

The rear hubs of the V8 are equipped with sealed angular contact ball bearings. Each of them has two rows of balls. This makes the structure as resistant to loads as possible, and also allows them to be distributed with the greatest efficiency.

The rear wheel bearing of the VAZ-2108 is made of heavy-duty steel. Its service life, declared by the manufacturer, is 90-120 thousand kilometers. By the way, these are not empty statements. Oddly enough, VAZ wheel bearings actually last a very long time and, if used correctly, can last twice as long as the stated mileage.

Installing a new bearing

To simplify installation, you can do a little trick - warm up the hub a little and cool the bearing in the freezer. In the first case, the metal will expand, in the second, it will contract. Pressing will be much easier and faster. The main thing is not to overheat the hub, otherwise the seal on the bearing will melt and the lubricant will leak out. As a result, you will have to buy new spare parts and do the repairs again.

Lubricate the inner surface of the hub and install the retaining ring on one side. Carefully now you can begin to press in the wheel bearing of the VAZ-2108. If the dimensions are correct and there are no deviations in the geometry of the nodes, assembly will not take much time. When finished, install the second snap ring. Assemble the entire assembly and install it on the CV joint, tightening the bolts at the top and bottom. If necessary, replace the ball joint.

The hub nut is tightened with a “30” wrench with very high force after assembling the entire suspension and installing the car on the wheels. The entire assembly is carried out in reverse order, do not forget about the marks on the surface of the shock absorber strut. After all the work, make sure that there is no significant wear on the rubber - otherwise, do a wheel alignment.

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Main characteristics and varieties

The rear wheel bearing on the VAZ-2108 is produced under catalog number 256706. It has the following technical characteristics:

weight, g – 400;
number of balls, pcs. – 28;
ball diameter, mm – 9.525;
static load capacity, KN – 25.9;
dynamic load capacity, KN – 30.1;
rated rotation speed, rpm – 6500.

The VAZ-2108 rear wheel bearing number may be different. If a store offers you a product marked 537906, don’t be surprised. This is a high-load bearing. Some of its characteristics differ from the characteristics of the standard spare part:

weight, g – 511;
static load capacity, KN – 90.1;
dynamic load capacity, KN – 64.8;
rated rotation speed, rpm – 5000.

As you can see, the reinforced rear hub bearing on the VAZ-2108 has increased resistance to loads. But at the same time, its rotation frequency should not exceed 5 thousand rpm. Such products, when properly used, can “walk” freely up to two hundred thousand kilometers.

Rear wheel bearing VAZ-2108: dimensions

As for the size of the wheel bearing, they are the same for both modifications:

outer diameter, mm – 60;
internal diameter, mm – 30;
width, mm – 37.

If you are offered a rear wheel bearing for a VAZ-2108, the dimensions of which do not correspond to those specified, it is better to refuse this purchase. All the above parameters are provided for by GOST 520-2002. Foreign analogues of spare parts are manufactured in accordance with the requirements of ISO 15:1998 and have the same dimensions.

wheel bearing and its replacement

The VAZ 2108 wheel bearing is a very important part of the car. It is with its help that the wheels rotate silently without making any extraneous knocks or noises.

Quite often, due to driving on a bad road, with a lot of potholes, when you increase speed or under other circumstances, you can hear a characteristic knocking sound from under the wheels. The reasons for this sound can be different, but the main one is the failure of the wheel hub bearing. This can be either a front or rear wheel bearing. In order to understand the essence of the problem, you need to conduct a small examination of the car.

How to understand that it is time to change the wheel bearing

A failed VAZ-2108 rear wheel bearing may indicate a malfunction:

the appearance of a characteristic hum from the wheel;
uneven rotation of the wheel;
backlash formation.

If you notice that there is a hum coming from one or both rear wheels, rush to diagnose the wheel bearings. You can do this right in your garage. Simply jack up the rear wheel and turn it by hand. It should rotate easily and evenly without making any sounds. Next, grab it with both hands and try to shake it from side to side in a horizontal direction. If the wheel rotates unevenly and you feel play when it becomes loose, get ready for repairs.

How to replace a rear hub

To replace the front wheel bearing of a VAZ 2108 you must:

Raise the car using a jack.
Jacking up the car
Unscrew the wheel nuts (you will need a 30mm spanner).
Remove the cap
Remove the wheel.
Unscrew the brake hose
Remove the brake hose
Remove the brake caliper.
Unscrew the bolts
Removing the caliper
Once you are able to remove the brake drum, access to the rear hub of the VAZ 2108 will open. It may happen that the hub and the drum are stuck to each other.
Therefore, in order to remove the drum, it may be necessary to press it out. Therefore, the VAZ 2108 wheel bearing is often removed immediately along with the drum (disc, if these are disc brakes). True, in this case you will have to change not only the hub, but also the drum. Removing the drum
Unscrew the hub nut secured to three bolts. These bolts are located very close to each other, so unscrewing them will not be easy. If the bolt doesn't fit, you can try warming it up a little. Heated bolts are easier to unscrew. True, you should be careful here so as not to get burned.
Pull out the hub from the inside using a screwdriver or a special puller.
Remove the hub.
Clean the hub mounting area from excess dirt using a degreaser.
Remove the retaining ring and press out the old bearing. We clean the seat and press in a new one.
Removing the ring
Knock out the old node
Preparing the seat
Pressing in the new unit
If there is no oil seal on the new hub, then it must be removed from the old one. Before direct installation, the oil seal should be thoroughly lubricated. To make it fit better, you can drip a little sealant on it from behind.
Install the hub. Tighten the hub nut a little so that it does not simply fall out.
Press in from the inside.
Tighten the screws at the back.

Features of choice

When buying a rear wheel bearing for a VAZ-2108, pay attention to the manufacturer. Currently, more or less high-quality domestic parts are produced by the following enterprises:

SPZ (Saratov Bearing Plant);
SPZ-4 (Samara);
VBF (GPZ-23, Vologda);
GPZ-20 (Kursk).

It is believed that the best domestic manufacturer of bearings is the Saratov plant. His products are very reliable, but not very expensive. Thus, a rear wheel bearing for a VAZ-2108 manufactured by SPZ costs between 400-450 rubles.

VBF products are also highly reliable and are slightly cheaper. Bearings SPZ-4 and GPZ-20 are designed for those who are used to saving on spare parts. Their cost is even less, but the quality leaves much to be desired.

There are also imported analogues on sale. They are, of course, expensive, but their quality is beyond doubt. For example, a rear wheel bearing for an SKF VAZ 2108, produced in Sweden, costs about 900 rubles. The Japanese equivalent, NSK, will cost about the same.

What tools will you need?

Before you begin repair work, make sure you have the necessary tools and supplies:

wheel chocks;
jack;
wheel bolt wrench;
chisel (core);
some object to fix the position of the car body when jacking up (a stump, several bricks, etc.);
hammer;
spacer made of wood (block);
head at “30” with an extended handle;
key to "7";
vice;
a piece of pipe for the outer diameter of the bearing;
long nose pliers;
special puller for the hub;
special pliers for retaining rings;
anti-rust liquid.

If you decide to change the rear wheel hub bearing on a VAZ-2108, also replace the hub nut. At least that's what the car manufacturer recommends. The fact is that the nut has a special edge that bends during installation and gets knocked down during disassembly.

Removing the front wheel hub

Now you need to remove the hub. To do this you will need:

Mark the position of the hub on the strut using a marker. Be sure to clean the surface thoroughly before doing this.
Using keys “17” and “19”, unscrew the nuts from the bolts securing the hub to the shock absorber strut.
Using a “17” wrench, you need to unscrew the lower bolts securing the ball joint to the hub. This is a simple option when you do not need to replace the ball. But if you need to change it, then you need to use a “19” key to unscrew the nut from the ball pin and remove it using a puller.
Completely unscrew the hub nut.
Carefully push the front wheel hub off the CV joint.

That's all, now you need to completely disassemble the element and remove the front wheel hub bearing of the VAZ-2108.

Changing the rear wheel bearing with your own hands

Replacement of the VAZ-2108 rear wheel bearing is carried out in the following order:

We install the car on a flat surface, fix the front wheels by placing wheel chocks under them.
Remove the cap covering the hub nut.
Using a chisel (core), we bend the bent edge of the hub nut so that it does not interfere with its unscrewing.
Using a 30mm socket with an extended handle, unscrew the nut. If it does not give in, treat the threaded connection with anti-rust liquid.
After unscrewing the nuts, unscrew (not completely) the wheel mounting bolts.
We lift the body with a jack, fix its position with stumps (bricks), and unscrew the wheel bolts. We dismantle the wheel.
Using a key set to “7”, unscrew the guide bolts on the drum (2 pcs.).
We remove the drum. If it is not removable, we treat the place where it fits onto the hub protrusion with a rust-fighting liquid, and then knock it down using a hammer and a wooden spacer.
Now completely unscrew the hub nut.
Using a special puller, we dismantle the hub, grasping it with “paws” and rotating the nut. If you do not have such a device, take the removed wheel and screw it to the hub with the back side. Use the wheel as a lever.
Remove the hub from the axle.
Using long-nose pliers or special pliers, remove the bearing retaining ring.
We place the hub in a vice and, using a hammer and a piece of pipe, carefully knock out the bearing.
When the bearing is knocked out, lubricate the inner surface of the hub with grease.
We install the new bearing without removing the hub from the vice.
We place a wooden spacer on top of the bearing and, hitting it with a hammer, hammer the part into the hub until it stops.
We put the locking ring in place.
We put the hub with the new bearing on the axle. If she sits down tightly, we help her sit down using a hammer and a spacer.
Screw on the new hub nut. We tighten it until it stops. The hub should still move inward.
Install the brake drum and secure it with guide bolts.
We mount the wheel.
Remove the jack and tighten the hub nut completely. If you have a torque wrench, observe the tightening torque (186.3-225.6 Nm).
We bend the edge of the nut, fixing its position.
We put a cap on the nut.
We jack up the body, check how the wheel rotates and whether there is any play. It is also recommended to check the operation of the parking brake.

description, device, dimensions and diagram :: SYL.ru

The wheel is attached to the rear hub of the VAZ-2108 using four bolts. There is also a brake drum here, with the help of which the car stops. The hub itself fails very rarely; it is usually replaced when the inner surface or threads into which the wheel mounting bolts are screwed are damaged.

It is much more common to remove the hub to replace the bearing. This is the most vulnerable element of the structure. Driving with a broken bearing will not bring much pleasure, as extraneous vibration and noise will appear, which intensifies when accelerating and cornering.

How to check a wheel bearing

If the rear wheel bearing of a VAZ-2108 breaks down, you will hear a characteristic howl coming from the trunk. Try to listen to which direction the sound is coming from. This will allow you to reduce the time spent searching for a faulty bearing. To make a diagnosis, you need to lift the wheel and then rotate it by hand.

If the bearing is in good condition, there will be no noise. The wheel should rotate without jamming. But if the bearing is faulty, then a strong noise will appear, as well as a metallic sound, as if the balls inside the bearing are rolling. The louder the noise, the greater the wear on the wheel bearing. It is advisable to replace both sides at once, this will improve the efficiency of the repair.

What tools will you need?

Before replacing the rear wheel bearing of a VAZ-2108, you will need the following tool:

A 30" head and a knob, as well as a piece of pipe. You can even use a spanner wrench, but it must be strongly curved to make it easier to install into the hub hole on the nut.
Punch or thin chisel. It is advisable to sharpen the chisel in advance. This tool is needed to straighten a jammed edge on a nut.
It is advisable to have three-legged and two-legged pullers. The first is necessary to dismantle the wheel hub, and the second to remove the inner race of the bearing.
Pliers for removing and installing retaining rings.
It is advisable to have a puller on hand to remove and install the bearing into the hub.
You will also need any type of keys for “12”, “13”, “14”.
You can't do without a hammer and wooden spacers.

Be sure to buy a good bearing, it is advisable to also buy a nut. It is not recommended to use the old one. You can purchase an assembled VAZ-2108 rear hub, this will greatly facilitate repairs, but will hit your wallet hard.

Bearing Specifications

The product catalog number is 256706, it has the following characteristics:

The diameter of the inner race is 30 mm.
The diameter of the outer ring is 60 mm.
Weight – 400 gr.
Bearing width – 37 mm.
Inside there are 28 balls with a diameter of 9.525 mm.
Dynamic load capacity of at least 30.1 kN.
Static load capacity 25.9 kN.
The bearing operates normally at 6500 rpm.

There are only four manufacturers of these products in Russia:

JSC SPZ (Saratov). Produces the highest quality and durable bearings. The cost is quite low.
GPZ-23 (Vologda). It produces very good elements, which are slightly inferior to those from Saratov (denoted by the abbreviation VBF).
Samara SPZ-4. The quality of the products does not differ, but the cost is very low.
GPZ-20 in Kursk. The plant was engaged in the production of high-quality products; currently only copies of previous years of production can be found on the shelves.

Preparation for repair

All work must be carried out on an inspection pit or overpass. But if you do not have such amenities, you will have to hang the rear of the car so that it is above the ground. The procedure for carrying out preparatory work:

Place the car on a level surface.
Place blocks under the front wheels.
Turn on first speed.
Loosen the nut that tightens the handbrake actuator (optional).

After this, it is necessary to loosen the bolts securing the rear wheel on which the repair is being carried out. It is also advisable to unscrew the nut on the hub, and then rip it off using a “30” wrench. You can then hang up the side of the car to make further repairs.

Removing the hub

To remove the rear wheel hub of a VAZ-2108, you will need to perform a few simple manipulations:

Completely unscrew the wheel bolts.
Remove the wheel.
Unscrew the nut that is located on the hub.
Using a 12mm wrench, unscrew the studs that secure the brake drum to the wheel hub.
Place these pins in adjacent holes and tighten them evenly. This way you will be able to move the brake drum from its place. If this does not help, you need to carefully knock the drum out of its place using a hammer and a wooden spacer.
Use long bolts; they need to be screwed into two opposite holes on the hub. It is necessary to tighten them until the hub begins to move out of its place. You can also use a three-jaw puller for this purpose. The last resort is to install the back of the wheel and pull it with your hands.
Sometimes the inner race of the bearing remains on the axle. It needs to be removed. To do this, first, using a chisel, you need to slightly move this ring on the axis, and then install a puller with two legs. After dismantling, be sure to check that there is no damage to the axle. Otherwise, clean the metal with a fine file.

At this point, dismantling the hub is completed, it is in your hands, and you can replace the bearing. The dimensions of the rear hub of the VAZ-2108 are the same as those of similar models that were produced under the names “Samara” and “Samara-2”.

How to remove a bearing

The most interesting thing is yet to come - you need to remove the bearing from the hub. To do this, follow these steps:

Use pliers to remove the retaining rings. If you don’t have such a tool, you can use a thin screwdriver or an awl.
It is advisable to use a special puller to remove the bearing. It is installed on the element over its entire area; when the nut is tightened, the bearing is evenly squeezed out. But if you don’t have such a tool, you can use the outer race from an old bearing. Applying blows evenly, remove the element from the seat.

The dimensions of the rear wheel bearing of the VAZ-2108 are slightly smaller than those of classic series cars. But this does not mean that they are very weak. If the bearing is installed correctly, it will last a long time.

Installing a new bearing

Before installing a new element, it is necessary to inspect the entire internal surface. There should be no nicks or damage on it. To make installation a little easier, you can place the new bearing in the freezer for several hours and warm up the hub. But please note that it should not be heated to very high temperatures.

Otherwise, when installing a new bearing, its seals will melt, which will significantly reduce the life of the element. The bearing must be pressed in using a puller or using a clip from an old element. Be sure to secure the position of the bearing with the circlips, making sure they fit into their grooves.

Final assembly

To assemble, follow these steps:

Install the hub onto the axle.
Place the washer and tighten the nut by hand.
Install the brake drum and tighten the studs.
Place the wheel and lower the car.
Tighten all threaded connections.
Place the nut on the hub.

Reassembling the entire assembly occurs in the reverse order. The hub nut must be tightened to a torque of about 200 N*m.