Replacing and adjusting the front wheel bearing Niva

Symptoms and consequences The sound of a failed front wheel bearing 2121 is often practically indistinguishable from road noise, especially in winter when driving in studded tires on asphalt. However, as the unit wears out, it begins to intensify and accompanies the driver continuously. An additional benefit is the heating of the wheel away from the center without the characteristic smell of brake pads.

At the first suspicion of a specific malfunction, you need to start looking for it, and then change the part, otherwise, not only acoustic comfort is disturbed, but also there is a possibility of complete destruction of the bearing , the appearance of wear on the hub with its subsequent replacement, and in the most advanced situation - misalignment and wheel wedge, which will allow you to easily “make ears” using a short wheelbase and the unique suspension settings of the Niva 21213 and 21214.

Diagnostics

In the absence of a special stand, it is possible to identify the problem. To do this, with precautions, hang up the supposedly faulty wheel. And then grab the extreme points in the horizontal and vertical planes and make swinging movements. A serviceable bearing has no play or it is insignificant, requiring replacement, on the contrary. In addition, when turning, you can hear rolling or cracking sounds. What then? It is necessary to change the wheel bearing yourself, because there is no talk of adjustment.

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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).

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Home » Choice » Front wheel hub Niva Chevrolet bearing replacement video

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.

Replacing the wheel bearing

The steering knuckle is placed in a vice, then the seal (oil seal) is removed with a straight-slotted screwdriver.

Next, the ring with the separator as part of the inner ring is pulled out sequentially. The bearing components are removed from the inside in a similar manner.

Pay attention to the side of the outer bearing and remove the outer ring from there with a punch. The same manipulations are typical for the opposite outer ring.

Disassembly is complete. Parts are defective and then, if necessary, replaced with new ones, components are cleaned of old lubricant, and filled with a new compound. It is recommended to use Castrol LMX universal grease for bearing joints and spline units. Assembly - in the reverse order using suitable pipe sections for pressing in bearings, oil seals, etc.

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Home » Choice » How to change wheel bearings on a Chevrolet Niva video

Adjustment

Having restored the structure until the calipers with pads are returned to their place, a dial indicator clamp is placed on the steering knuckle. The indicator is positioned so that its leg rests against the adjusting nut.

Having built a lever on studs, the mechanism smoothly rotates around its axis.

If the permissible gap exceeds 0.15 mm , the adjusting nut is replaced with a new one. By successively changing the degree of twisting, the clearance in the bearings is measured. At the end of the work, the nut is locked.

Is there an alternative to permanent repairs?

It must be admitted, but the wheel-bearing unit of the Niva 4x4, being one of the most loaded in the car, has never learned to be reliable. Whether the culprit is bad components or design errors is not easy to figure out. However, the experience of the owners suggests using alternative options, for example, replacing the “stock” with double-row bearings (IVECO, Moskvich, etc.).

Unlike the standard:

The unit does not require adjustment or lubrication - all settings are made from the factory.
There is no possibility of rotation;
Wear of seats is minimal;
Has an extended service life.

The difficulty of implementation lies in the need to bore the hub for a double-row bearing, as well as the relatively high cost of the components. But there will most likely be no short-term attempts to change the wheel bearing again.