According to the vehicle maintenance card, it is necessary to replace the front wheel bearings of the VAZ-2108. Their dimensions are larger than those of similar ones installed on the VAZ 2101-2107 model. Moreover, there are features of the replacement. The “classic” uses tapered bearings; it is imperative to observe the permissible force when tightening the hub nut. Otherwise, the bearing will fall apart and you will have to buy a new one. Eights use cylindrical bearings; when tightening the hub nut, you need to apply as much force as you can - just don’t break the thread.
Signs of a broken wheel bearing
As the vehicle is used, its components and assemblies wear out. Moreover, those that suffer the most are those that are constantly loaded - these are rubbing parts. The weight of the engine and the friction force act on the front hub bearing of the VAZ-2108. That's why its dimensions are so impressive - to cope with the load. But when an element fails, the following symptoms occur:
- In the early stages, a barely noticeable hum appears.
- Minor vibrations may be felt transmitted from the wheels to the body.
- As the bearing wears, the noise and vibration increase.
If you do not replace it in a timely manner, the bearing may jam. During operation, excessive heating of the hub will be observed - there is very little lubricant inside the bearing race, the metal elements rub against each other.
Replacing the rear wheel bearing of a VAZ 2108 along with the hub
Sometimes there is a situation when a new ball bearing fits into place too easily.
If there is at least some play, this means that the wear is too large and the dimensions of the diameter of the inner ring of the hub are already beyond the permissible limits. Even a serviceable element will give a runout in this state of affairs. If this is the case, replace the unit completely. If the thread is damaged, replacement is also advisable.
The process is exactly the same as mentioned above:
- Remove the wheel;
- We dismantle the brake drum;
- Unscrew the fastening nut;
- Remove the hub completely;
- There is simply no need to press out the bearing - just mount the new part in the reverse order of the first three points. The main thing is to lubricate the new elements and tighten the bolts according to the recommendations in the instruction manual.
Replacement of the ball bearing with run-out check:
Quick replacement in 15 minutes:
Repair tool
To replace the front wheel bearing of a VAZ-2108, you will need a tool. All work must be carried out on a well secured vehicle. You will need the following tool:
- Set of keys and sockets.
- Mounting blade.
- Bearing puller.
- Gas-burner.
- Jack, wheel chocks and secure supports.
- A small piece of pipe with a diameter of 10 cm.
- Hammer and chisel.
- Pliers for removing retaining rings.
The procedure for carrying out work on the left and right wheels is the same. It is advisable to replace bearings on both sides at once. It is required to install elements from the same manufacturer, which are recommended by the factory.
Replacing the front wheel bearing of a VAZ 2109 - first steps
Regardless of the replacement method, the initial operations will be similar:
- Before putting the car on a jack, it is recommended to loosen the front hub nut.
- Then loosen the front wheel mounts.
- After removing the wheel, unbend the locknut collar.
- Next, tighten the bolts that hold the caliper, top and bottom, one at a time.
- Then use a screwdriver to straighten the pads in the caliper.
- We hang the caliper or move it to the side. Further operations will follow, based on the specific replacement option.
Preparing for repairs
Now it's time to remove the old VAZ-2108 front wheel bearing. Its dimensions are indicated in the article below; when pressing out, you can use a clip from an old roller. Before starting work, do the following:
- Loosen the front hub nut.
- Using a 30mm wrench with a large lever, remove the nut.
- Install wheel chocks under the rear wheels.
- Remove the wheel bolts.
- Raise the side to be repaired with a jack.
- Place supports under the car.
- Remove the wheel and place it under the car engine.
That's all, now you can start dismantling the front wheel bearing of the VAZ-2108. The dimensions of the old and new must match. If the diameter is slightly larger or smaller, the bearing may not work properly.
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.
Design and purpose of hubs
The VAZ-2108 moves due to the fact that from the running engine, through mechanical transmissions, torque is transmitted to the drive wheels (in this case, the front wheels). But if the connection between the wheels, axles and the frame is rigid, then movement on an uneven surface will simply become impossible. In addition, all components will quickly fail as a result of colossal shock loads.
To prevent this, a system of intermediate links (levers), or suspension, is used. It should smooth out the effect of road surface irregularities on the ride. Its final unit, to which the wheel is attached, is the hub. This is a cylindrical housing part that is installed on the drive and driven shafts. Between the hub and the shaft there is a bearing, which allows the wheel to rotate.
The main functions of this node are:
- ensuring a secure fit and fastening of the wheel;
- fastening of brake elements (front - disc, rear - drum);
- transmission of torque from the transmission to the wheel through the axle shafts and reliable fastening of the latter.
Structurally, any hub consists of the following components:
- Outer rim. Made in the shape of a glass with holes for exiting and fixing the axle shaft, as well as the wheel disk.
- Bearing cup. In fact, this is not a separate unit, but just the inner part of the rim, which has the necessary dimensions for installing rotation supports.
- Slotted hole. Again, part of the rim is the central hole in it, which has a spline for installing and fixing the axle shaft.
The wheel hub is formed from a cast blank by machining the seating surfaces.
Bearing removal
To remove the bearing from the seat, you will need a puller. You can even make it yourself, there are no scarce components, the design is very simple. The VAZ-2108 front wheel bearing puller is a long bolt with a coarse thread and a nut. And most importantly - spacers and mandrels with a diameter similar to that of a wheel bearing. If there is no such puller, then all the work can be done with a hammer, but there must still be a mandrel.
First of all, remove the hub itself, in which the holes are made for attaching the wheels. Next, you need to use pliers to remove the retaining rings. If you don’t have such a tool, you can use a flat-head screwdriver, pliers and an awl. After removing the rings, you can begin pressing out the bearing. If you do this with a hammer, then try to hit accurately and sharply, this way the bearing will come out faster.
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.
Bearing sizes
The article contains a photo of the VAZ-2108 front wheel bearings, as well as a drawing of a puller indicating all dimensions. Therefore, if you are in doubt whether you purchased the right roller, check the dimensions of the hub. The part number is 256907.
The dimensions of the element are:
- The outer diameter of the holder is 64 mm.
- Inner diameter – 34 mm.
- Weight – 445 g.
- Balls with a diameter of 9.525 mm are installed inside.
- The total number of balls is 28.
- The unit is designed to operate at rotation speeds above 6000 rpm.
In any car store, salespeople will be able to advise you on the best quality product.
Technical requirements documentation
The choice of class is made taking into account the following features: rotation and conditions of use. The most popular bearings are classes from 0 to 6. TNPA 520-2011 establishes auxiliary and fundamental types of accuracy. More precise roller bearings are required in special cases.
The operation of unit 2109 at elevated temperatures requires taking into account the uneven tension of the small 45 mm holder and the axle. The amount of fit increases with increasing operating temperature in the bearing.
Considerable overloads require the use of tighter connections between the inner races with the spindle and the outer races with the body. The seating dimensions of roller bearings 2109 are selected in accordance with the GOST 3325-85 standard (Rolling bearings). The seating dimensions of large roller bearings differ from normal and small ones to a greater extent.
The period of use is determined by operating conditions. The load-bearing capacity value is increased. Roller bearing 2109 is a standard product. Roller bearings 2109 belong to the class of precision mechanisms. Operational parameters are set out in GOST 520-2011 Rolling bearings. General technical conditions.
Manufacturers
Many motorists do not know which VAZ-2108 front wheel bearing to choose for their car. Now you can find several manufacturers on the market:
- GPZ-23, Vologda, has the abbreviation VBF. The plant has earned the trust of motorists and is one of the best manufacturers of wheel bearings for domestic cars. Due to the relatively low cost, these parts are practically not counterfeited.
- SPZ, Saratov - according to many experts, the bearings of this manufacturer are the most reliable, durable and high quality. And most importantly - the very low cost of parts.
- GPZ-20, Kursk is no longer engaged in the production of wheel bearings, but you can find products in stores and warehouses.
- Experts do not speak very well of the Samara SPZ-3. The cost of the bearings is very low, but the quality is not great, the service life is very short.
Some auto stores try not to deal with little-known companies that produce low-quality products. Therefore, on the shelves you can only find bearings from Saratov and Vologda.
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.
Radial roller bearing 2109
Viscous lubricants are suitable for peripheral speeds of up to 10 meters per second. For radial roller bearings, softer greases are selected compared to ball bearings. With the correct lubrication and correct operation, the friction path of the bearing bushings is shiny and smooth.
Roller bearing lubrication
The correct choice of lubrication for radial roller bearings:
- reduces starting efforts
- increases durability, operational reliability
- reduces heat generation, friction
The lack of the required amount of lubricant or its incorrect choice leads to the appearance of a glassy mark on the roller tread. A matte raceway can be a sign of unsafe wear. The appearance of brown or brown deposits on a treadmill bearing is not a bad thing.
To improve the performance of lubricants, antifriction additives are used. Liquid lubricants are especially recommended for peripheral speeds above 10 m/s. Mineral oils are predominantly used for liquid oils.
