Assembling the VAZ 2121 hub. Simple disassembly of the Niva hub.

Repairing the hub of “Niva-21213”

My old Niva has a disease. The wheel bearings on the right don't last long. Once a year or two I change them, and together with the hub, because, according to the instructions, with a slight movement of the hand towards you, the hub does not come out of the steering knuckle and you have to knock it out along with the bearings, and then, having examined and noticed the “grooves” on the seat of the internal bearing and the collar, sadly I’m going to buy a new one... Moreover, on the left I only changed the hub once or didn’t change it at all - I don’t remember now. I try not to take it apart unnecessarily. Today I started assembling hubs after repairing the front suspension and noticed differences in two new hubs purchased at different times and in different places, as well as differences in their operation. The difference is strange and I cannot explain it. It consists in the presence or absence of a ring at the point of contact of the hub with the end of the steering knuckle bushing. Previously, I neglected this difference, because... I disassembled the hubs at different times and it was not possible to compare defects on different designs.

Hub type 1.

Manufacturer: VAZ JSC. Price 707 rubles in a store selling factory (?) spare parts. Rosstandart stamp. Pay attention to how the place that comes into contact with the steering knuckle is designed. Here we see grooves of varying depths

Hub type 2.

Bought at the car market for 550 rubles.
Manufacturer unknown. I purchased a hub of a similar design in Pskov several more times, since the loss of the original one. The difference is a slightly rougher surface treatment and the presence of an unfortunate yellowish ring at the point of contact with the end of the steering knuckle, where the factory hub has just a groove. Photographed after assembly with the brake disc. Look - a hollow (U-shaped in cross-section) ring in the place where there should be a notch.
When I first bought such a hub, I asked what the hell it was. I was told that this was a “better” hub, so I continued to use this type of hub until today, not paying attention to the ring and not being puzzled by its absence or presence. So today, after turning two different types of new hubs in my hands, I decided to see what the old ones looked like. They looked different. Left left, factory type 1, without ring. On the right is the right one with a ring - type 2. Hub Type 1. Without a ring, factory (?) Used for at least 4 years. The inner bearing has been removed. The outer one came out of place tightly, but its inner ring moves freely along the seat of the inner bearing and even spins merrily on it. The knurled collar prevents it from being completely removed. The oxidation layer (?) at the site of the outer bearing is preserved, but absent at the site of the internal one. Hub Type 2. Used for a little over a year. The ring is heavily dented during use and shows signs of rotation and friction. The oil seal has not been removed, there are nicks on the seat from the chisel used to knock down the bearing. The seat for the inner bearing is worn, but less than that of the left hub, there is a fillet along the edge. It is because of this that the inner ring of the outer bearing cannot be removed, and in general the hub cannot be removed from the steering knuckle as required by the instructions. Let's take a look at the steering knuckles. The left steering knuckle that worked with the factory hub. The condition of the contacting surfaces is almost perfect. The o-ring (?) is in place and in good condition. The right steering knuckle that worked with the hub with the ring. The condition is not very good. The sealing ring is crushed “to a cone” and has traces of friction during rotation against the ring on the hub. The oil seal is not pressed in completely, I realized this later, it is still recessed by 3 millimeters. Now the actual questions. 1. How to achieve correct mating of the steering knuckle with the hub and ring (Type 2). Remove the ring from the hub or the knuckle? If both rings remain intact, they rub against each other and become deformed. Moreover, as I understand it, the correct (completely) seating of the bearings is not ensured. 2. How far should the oil seal be driven in in the photo above. Enough or all the way? 3. Why do hubs fail so quickly and, first of all, the seats for internal bearings wear out with the formation of a shoulder. The bearings, apparently, would still be working if it had not been necessary to disassemble the hub with a sledgehammer. 4. How necessary is it to install spacer rings between the bearing and the oil seal? I only have one left, but I can’t buy it. And how is it installed correctly? Cone to the bearing or oil seal. I had a cone facing the oil seal, but I’m not sure which is correct. 5. Is it necessary to stuff lithol into the seals? Indications vary.

Well, as an epilogue, the machine is in progress. New steering rods manufactured by “Trek” were installed, a front beam with a new pressed-in bushing was installed, which turned out to be 1.8 mm shorter than the original one and also with chamfers removed from the inside, as a result of which the area of ​​​​the pressing surface to the washers decreased by about 1.5 times . There is a risk that the washers will, if not rotate, then be pressed inward.

And now for those who read to the end the answers to some questions. The hub with the ring is the hub for the Niva-2121 - it has a slightly different design of the hub assembly. It turns into a Niva-21213 hub by picking out a copper alloy ring. On the Niva 2121, mud rings were not put on the steering knuckle (I incorrectly placed this ring as an “o-ring”). On Niva-21213 they are provided by the design of the steering knuckle. It is absolutely not correct to put two rings on the Niva 21213 hub. It is necessary to install (requiredly) only a dirt deflector that fits on the steering knuckle. I used to do everything correctly, but then I lost this secret knowledge and when I wrote the post I decided that I had always installed it with a copper ring, especially since due to some misunderstanding the last time I had an old hub with a hub ring assembled at a service center without dismantling it. What this led to can be seen in the photo. By the way, I never changed the left hub, but the right one still works after this repair.

How to diagnose a broken hub

Surely every driver has at least once encountered a situation when, while driving, a so-called crackling noise is heard. The sound can appear at speeds of 40 km/h and above. Using a car with such a sign is fraught not only with danger to the life of the driver and passengers, but also with serious consequences for the car itself. Most likely, you will notice a hum in a loaded car when turning.

Finding out which wheel bearing is worn out is quite simple: if there is noise from the wheel when turning to the right, the left bearing should be replaced. Similarly, if a hum occurs when turning left, pay attention to the right bearing.

There are several stages of wheel bearing wear:

• hum when turning;
• hum during normal driving with a loaded car;
• hum when driving an empty car;
• constant hum that increases during turns;
• a strong hum, accompanied by crunching, grinding and unregulated movements of the car from side to side.

The period of time between the first and fifth stages with moderate driving can be up to 5 years. It is recommended to replace the part as soon as possible so as not to put the car and the driver’s life at risk.

What could have caused the Niva Chevrolet bearing to fail:

• in 70% of cases, breakdown occurs due to unsuitable lubricant: its quality, excess or shortage may well damage the part;
• it happens that various contaminants and moisture penetrate deep into the bearing;
• this is the cause of failure in 18% of cases;
• There is also a possibility of incorrect assembly of parts, which entails excessive load and overheating.

What are the risks of driving a car with a damaged wheel bearing? There is a considerable possibility of the wheel jamming, which can end in disaster when driving at high speed. It is quite possible to lose control of the car due to the wheel “moving to the side”. Spreading brake pads is also a possible consequence.

Why is replacement necessary?

There are some signs indicating that the front wheel bearing on the Niva needs to be replaced. The very first sign is a strange sound, different from normal when moving on the road.

If it appears, you should pay attention to the following points:

1. Wheel overheating.
2. The front wheels send vibrations through the steering wheel and body.
3. When driving at high speed, the car pulls to the sides.
4. It is difficult for the driver to control the steering wheel when driving off-road.
5. When you turn the steering wheel, you can hear the crunching of the wheels (even with the engine off).

Even the presence of one sign may indicate that the front hub of the Niva 2121 requires replacement. A damaged bearing will cause the suspension ball joint to fail and the axle shaft to break. This can cause the car to roll over when driving fast.

Most Niva 2121 bearings fail at 100,000 km. mileage, even with declared wear resistance. This is due to the poor condition of the roads and the constant use of the vehicle in difficult conditions. In addition to natural causes of failure, improper installation of the bearing, insufficient lubrication and excessive tension can affect it.

Replacing the front wheel bearing on a Niva Chevrolet

It is recommended to entrust installation to professionals. However, if you have a set of tools and free time, it is quite possible to perform the replacement yourself. Before starting repairs, you need to visit a car wash and wash the front suspension especially thoroughly. The second important step is the correct dismantling of the part. To do this, you need to block the wheel and remove the bolts that secure the wheels. Further:

• first, use a jack to suspend and secure the front part of the car;
• then remove the wheel along with the brake pads;
• unscrew the piston pin of the swing arm;
• we take out the bolts that secure the ball joints;
• screw the hub together with the hinges.

The fact that the wheels on a Chevrolet Niva rotate smoothly is determined by the presence of bearings in the hubs. They can stand on both the front and rear wheels. Bearings are designed to reduce friction.

If such bearings fail, the wheel warps and the rubber begins to wear unevenly and quickly. If the bearing is damaged while the car is moving, the wheel will simply lock and stop rotating. For this reason, it is important to pay timely attention to bearings, especially on the Chevrolet Niva, since the car is an SUV and therefore experiences heavy loads on the chassis.

Also interesting: Niva car steering gear

At this point, the process of replacing the wheel bearings on a Chevrolet Niva can be considered complete. After assembly, you should check the ease of rotation of the wheel.

Removing the hub

To do this, dismantle the conical bushing.

Unlocking the nuts is done by gently tapping them through a chisel.

After which, using a size 19 wrench, the rear and front clamps of the lever to the knuckle are unscrewed sequentially,

not forgetting to get rid of the locking plate.

Then, using the keys “17” and “10”, as well as a flat screwdriver, the brake circuit hoses are removed from the steering knuckle.

Having placed the stop under the lever from below, use two “13” keys to unscrew the nut located on the bolt that secures the ball mount to the upper lever. Unscrew 2 more nuts in the same way. And take the knot to the side.

The lower ball joint is also dismantled.

When the part is freed from the fastenings, holding the steering knuckle with both hands together with the hub, brake disc, upper and lower ball joints, it is removed.

When separating parts, you may need to clamp the steering knuckle in a vice , after which the hub is knocked out without extra effort.

Next, the bolts securing the steering knuckle to the lever are removed.

The brake disc is knocked out by screwing the nuts onto the stud, followed by concentrated blows to the resulting structure.

The result of the work at this stage: the brake system disc and hub are separated from each other.

They hook up the ring that protects against dirt, after which, using a “10” key, remove the casing that protects the steering knuckle.

How to change a wheel bearing yourself

(as well as the rear) Chevrolet Niva has exactly the same design as old cars, and their repair and replacement are carried out according to the same scheme. Initially, you should go to any car wash, where you should thoroughly wash the entire front suspension under high pressure. For crossovers, this advice is especially important.

• The front of the car is raised using a jack;
• The corresponding wheels, brake pads and calipers are dismantled;
• The hinge pin is untwisted and pressed out using a special tool;
• The bolts from the hinges and nuts are removed.
• After this, you have the opportunity to examine the part for damage and make appropriate repairs. Regardless of whether you plan to replace the bearings, you should change the seals.

After removal, the inner race along with the rollers must be thoroughly washed with kerosene. After this, you will be able to visually assess the bearing damage. It is worth remembering that these parts are replaced only in pairs.

• There is no possibility of adjusting the backlash using a nut (tightening does not help);
• The rollers and clips are heavily scratched;
• Overheating is detected and a hum is observed.

If you observe one of these signs, you need to get new bearings for your Chevrolet Niva. Otherwise, only the lubricant and oil seal need to be changed.

Pressing occurs using special nozzles. Do not throw away the old clip, as you will need it to install the new part.

If difficulties arise, you can always find one of the many videos on the Internet that demonstrate this process.

Symptoms of a problem

The following symptoms indicate that the wheel bearing has failed:

• The appearance of a specific crunch, clearly audible inside the cabin. This sound is made by balls that roll in a broken bearing.
• Vibration. It occurs when there is severe wear and is felt simultaneously in both the body part and the steering wheel. The appearance of vibration is an extremely dangerous sign that the wheel bearing can jam at any moment.
• Deviation of a car from a straight path while driving. This occurs due to the fact that the side of the car on which the hub bearing has failed becomes somewhat stuck (approximately the same picture is observed when the wheel alignment is not properly adjusted).

The appearance of at least one of the above symptoms indicates that the wheel bearing should be replaced immediately. This operation is not too complicated; it does not require deep technical knowledge or special tools, so even an inexperienced motorist can cope with it.

Hub repair: popular mistakes and misconceptions

Connoisseurs of tuned cars are often able to make radical changes to their cars. And few restrictions exist for them. Owners of Niva Chevrolet are no exception. Tuning fans also took a look at the design of the front hub assembly.

Often on online forums in discussions you can find advice (and even corresponding training videos) about replacing the bearing using a hub mechanism that has a steering knuckle from a VAZ 2121 car, since it is believed that this design is better in terms of reliability.

However, this is a misconception.

Yes, tightening will occur without any difficulties, but this will make it impossible to adjust the camber of the front wheel of the car. The fact is that each fist has distinct differences in size and axial angles. But much more stupid are the tips that require turning the hub and shaft on a lathe.

Repairs such as replacing a wheel bearing in a field can be done independently without much difficulty. Wheel bearings on the VAZ 2121 and Chevrolet Niva have a very short resource due to the suspension design, compared to other all-wheel drive vehicles, therefore, these parts need to be given increased attention in order to identify the fault in time.

Replacing a wheel bearing in the field does not involve anything complicated if you follow the instructions strictly. Anyone, even a novice car owner, can cope with such repairs. Not all vases have wheel bearings changed the same way. The design of the Niva car hub differs from the design of other VAZ models, so the process of replacing the bearing will also have its differences.

Symptoms and identification of a worn wheel bearing

When the life of the hub bearing is running out, a hum is clearly audible when driving, this is the main sign. If you listen, you can understand which direction this hum is coming from. When driving at low speeds, it is not too noticeable, and it can easily be confused with noise from rubber, but as speed increases, the hum increases, which is reminiscent of flying in an airplane. You can’t drive with a humming bearing, because soon it may simply break into pieces, and this implies a lot of other problems.

If there is an assumption that the bearing has exhausted its service life, then you can check this with the car parked. To do this, you need to jack up the wheel whose bearing is suspected and pull the wheel vertically with your hands. If there is play, then the bearing is most likely to blame.

Necessary tools for work

• Jack and supports. To replace the front bearing, you need to lift both wheels, otherwise the stabilizer will interfere, pinching the suspension elements;
• Wrench for unscrewing wheel nuts;
• Flathead screwdriver. To remove the protective cap;
• Head 27;
• Locksmith's beard. To straighten the collar of the hub nut;
• Hammer;
• Wrenches for 10, 17, 19 and 22;
• Chisel and wooden spacer. To avoid damaging other parts when knocking out;
• Vise;
• A piece of pipe for pressing in bearing retaining rings.

Bearing replacement process

• Loosen the nuts on the wheel where replacement is planned and jack up both wheels of the axle. Remove the desired wheel;
• We dismantle the caliper and guide. To avoid damaging the brake hose, we tie the caliper to the upper arm with wire;
• Having removed the protective cap, use a 27mm head to unscrew the hub bearing nut and remove the conical bushing;
• Using a chisel, unbend the locking plate of the front and rear lever mounting nuts. Using a 19mm wrench, unscrew the front and rear nuts securing the lever. After this, remove the locking plate;
• When the lever is released, it must be moved away from the steering knuckle, freeing the brake hose;
• Disconnect the ball joints (upper and lower) from the lever;
• Now you can remove the entire steering knuckle assembly, along with the ball joints and the brake disc, by removing it from the CV joint splines;
• Separate the steering knuckle from the hub with the brake disc. If the parts do not separate freely, then we clamp the fist in a vice and, using a soft metal drift or chisel, through a spacer from wood, knock out the hub with the brake disc;
• Next, pull out the bolts securing the lever and knock down the protective ring with a chisel;
• Using a 10mm wrench, unscrew the bolt that secures the casing and remove the casing itself;
• We hold the fist in a vice and, using a flat-head screwdriver, pry up and remove the wheel bearing seal. There is a metal ring behind the oil seal, we also remove it;
• The next step is to remove the inner ring of the outer bearing assembly from the well. Next, we also remove the oil seal, metal ring and inner bearing ring assembly;
• Using a punch and a hammer, we knock out the metal rings of the outer and inner bearings. At this point, dismantling is considered complete.

After cleaning the well from old grease, you can proceed to installing a new bearing. Replacing a wheel bearing in a field occurs in the reverse order; it is only important not to forget to fill it with fresh Litol 24 grease and, after installing the steering knuckle on the car, adjust the clearance in the bearings.

Replacement

To replace the front wheel bearing in the field, it is necessary to remove the front axle brake calipers. Why you should:

Hang up and unscrew the wheel; Using a chisel, knock the cap off the hub;

• Using pliers, remove the cotter pin located on the lower axis of the clamping lever;

• Carefully remove the axis of the clamping lever using a metalworker's drift and then remove it using pliers;

• Using a flat-head screwdriver, having previously removed the clamping lever and springs, remove the brake caliper from its seat and place it behind the steering knuckle in such a way as not to interfere with the further process (hang it).

Replacing the NIVA wheel bearing

We will show you how to replace a wheel bearing in a NIVA car. To work, we will need new wheel bearings, two wheel seals, and a standard set of car enthusiast tools. The entire repair process is shown from start to finish, with detailed comments from the author along the way.

Owners of this car very often encounter the problem of a humming wheel bearing. It is recommended to remake the bearing for 108, after that there is no need for any adjustments or tightening it once a month. If for some reason you do not want to change the wheel bearing, then you must change the hub seals during disassembly.

Checking the hub and wheel bearing

If, while driving, you hear a sound whose frequency gradually decreases or increases depending on the speed. To diagnose the problem, you can use this method. We hang the wheel, place a stump under the lower arm and lower the car onto it. Next, we grab the bottom and top of the wheel with our hands and start pumping. If you feel any play, you can simply tighten the bearing. If this does not help you, there is still play, then most likely the hub has become unusable and needs to be replaced. If there is no play, there is a high probability that the bearings have failed.

The sound of a faulty wheel bearing is dull; it can be clearly heard at an average speed of 60-80 km if the car is rolling in neutral gear.

Case from practice

The owner of Niva came to the car service center with a complaint about bad brakes. When the brake pedal was pressed, it sank to the floor and only when pressed again did it work as it should. Everything indicated that there was air in the brake system, but bleeding did nothing. In the end, it turned out that the fault was with failed wheel bearings and the hub itself. The inner race of the bearing rotated on the hub.

Arrows indicate production and pitting. For comparison, this is what the new hub looks like.

But what happened to the bearing.

How to convert knuckles to double-row bearings

Do you want to modify your Niva, but have a small budget? Then we’ll show you how to remake the front hubs on a Niva with your own hands. Required:

• double-row bearing from Moskvich 2141 (catalog number: 2141-3103020), or an analogue from Craft (article: CR4172370);
• two retaining rings from the same vehicle (part number 366553-15).

We take the drawings and seek the services of a turner. The master must bore the hub to fit new bearings, grind the steering knuckles and make parts according to the diagram. By the way, some Niva 4x4 owners also use an AUDI 74x40x74 wheel bearing, in this case only the steering knuckles are ground.

After the parts are manufactured, all that remains is to press in the double-row bearing and reassemble the already non-adjustable hubs. At the end of the work, tighten the hub nut with a large torque “from the heart”. Their adjustment is no longer required, you can forget about the hum and howl while driving!

Have you ever encountered a similar modification to the Niva hub? Leave recommendations and reviews about your options for upgrading the VAZ 2121, 2131. Let us remind you that the domestic SUV has other shortcomings, which are also eliminated by modifications. You can also find information about the car you are interested in by its content.

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