A low hum that increases with speed or a knocking sound when turning the steering wheel are sure signs that hub your car needs attention. For owners Nissan Almera G15 this is especially important, since the resource of the front units on this model is often limited by operating conditions and road quality. Ignoring the symptoms can result in a wheel seizing or brake rotor failure, which poses a direct safety hazard.
The replacement process is not overly complicated, but requires specialized tools and strict adherence to the sequence of actions. You have to dismantle the unit, press out the old bearing and press in the new one, without damaging the seats. In this article we will analyze each stage, from the selection of spare parts to the final tightening of the bolts.
Diagnostics and selection of spare parts
Before proceeding with dismantling, you need to make sure that the problem is in the bearing and not in the ball joint or CV joint. When riding on a lift or in a pit, try rocking the wheel in the vertical and horizontal planes. Play in the hub is felt as a characteristic knock, which disappears when the hub nut is tightened (if it is not unscrewed).
When selecting a new node for Nissan Almera G15 It is important to consider that many manufacturers offer both individual bearings and hub assemblies. For this model, it is often more profitable and reliable to change the hub assembly with the bearing, as this eliminates errors during pressing and guarantees a perfect fit.
- 🔍 Check for a quality certificate for the packaged spare part.
- ⚙️ Original or high-quality analogues (SNR, SKF, KYB) are the key to long service.
- 📏 Make sure that the bearing is suitable for the G15 body (sizes may vary).
⚠️ Caution: Do not attempt to reuse the old bearing once it has been removed. The pressing process almost always destroys the internal elements, and repeated installation will lead to rapid failure of the unit.
Tools and workplace preparation
To complete the job, you will need a set of wrenches, a jack and, most importantly, a wheel bearing puller or a powerful hydraulic press machine. Working on a pit or a lift is preferable, as it provides convenient access to the lower part of the suspension. Be sure to have a clean rag and a penetrating lubricant like WD-40 ready.
It is critical to prepare the area for the wheel installation. Make sure that the jack is on a solid base and that the vehicle is additionally secured with wheel chocks. Safety comes first when working with suspension, as even a slight movement of the vehicle can lead to injury.
- 🛠️ Set of socket heads (from 10 to 32 mm) and wrenches.
- 🔨 A powerful hammer and a set of knockouts for dismantling old elements.
- 🔩 A wrench for unscrewing the hub nut (an extension is often required).
- Hydraulic press
- Puller included
- Just a hammer and mandrels
- There's nothing yet
Step-by-step instructions for dismantling
Start by jacking up the car and removing the wheel. Loosen the hub nut without unscrewing it completely. Then you need to remove the caliper and brake disc. Unscrew the caliper mounting bolts and hang it on a wire so as not to damage the brake hose. Remove the disk by first unscrewing the guides.
Next, disconnect the ABS sensor. This is an important step because the sensor wire is often riveted to the strut or runs through the hub. Carefully unscrew the sensor mounting bolt and disconnect the connector. Do not pull the wire as it breaks easily.
Now you need to unscrew the lower bolt securing the steering knuckle to the lever. After this, disconnect the steering knuckle from the steering knuckle. To do this, use a puller or carefully knock out the finger with a hammer, striking the ear of the fist, not the thread of the tip.
Pull the CV joint out of the hub. This requires force, so use a pry bar. Be careful not to damage the CV boot. After removing the CV joint, the steering knuckle and axle will freely move away from the shock absorber strut, and you can completely remove the hub assembly.
- 🔧 Unscrew the hub nut and remove the washer.
- 🚫 Do not damage the brake hose when removing the caliper.
- ⚙️ Carefully remove the CV joint so as not to damage the boot.
⚠️ Attention: When removing the CV joint from the hub, do not pull it by the boot or grenade housing, otherwise you may damage the internal seal.
☑️ Preparation for dismantling
Replacing the bearing assembly
If you choose to replace the hub assembly, the process is greatly simplified. You do not need to use a press to press out the old bearing and press in the new one. It is enough to simply install a new unit in place of the old one. This saves time and reduces the risk of errors.
Clean the seat in the steering knuckle from rust and dirt. Make sure the surface is perfectly flat. Install the new hub and tighten the bolts to the strut and arm to the required torque. Use a torque wrench to avoid misalignment or under-tightening.
Insert the CV joint back into the hub until it clicks. Make sure the locking ring is engaged. After this, reassemble all the components in the reverse order: install the steering end, screw on the caliper and brake disc.
- 🔩 Tighten the hub mounting bolts with a force of 100-120 Nm.
- 🛡️ Check the integrity of the CV joint boot before assembly.
- 🔊 Make sure the hub rotates freely and without noise.
What to do if there is no puller?
If you don't have a hydraulic press, you can use special mandrels and a hammer. But this requires great precision and strength. An incorrect impact can destroy the new bearing immediately upon installation.
Installation and final tightening
After assembling the suspension, you need to install the wheel and lower the car to the ground. Only on the ground can you finally tighten the hub nut. This is a critical point, since the tightening is carried out on a loaded suspension.
Use a torque wrench to tighten the hub nut. The force must be strictly in accordance with technical regulations Nissan. Typically this value is around 200-250 Nm. After tightening, be sure to secure the nut by bending the edge of the washer or using a new cotter pin if the design allows for this.
Check the operation of the ABS sensor. Connect the diagnostic scan tool or simply drive at low speed, making sure that the ABS light does not light up on the dashboard. If the lamp is on, check the sensor connection and wire integrity.
- ⚙️ Tighten the hub nut with a force of 200-250 Nm.
- 🔍 Check for any play in the steering.
- 🛑 Make sure the brakes work properly after replacement.
Before final tightening of the hub nut, make sure that all suspension mounting bolts are tightened so as not to disturb the geometry when pressing the brake pedal.
Technical characteristics and nuances
To understand the design features Nissan Almera G15 It is worth referring to the table with the main parameters. Knowing this data will help when selecting tools and spare parts. Pay special attention to the diameter of the hub nut and the tightening torque.
| Parameter | Meaning | Comment |
|---|---|---|
| Hub nut diameter | 30 mm | Requires a powerful wrench or pneumatic wrench |
| Nut tightening torque | 200-250 Nm | Depends on the year of manufacture and modification |
| Bearing type | Double row ball | Does not require adjustment or lubrication |
| ABS sensor | Active/Passive | Check the type before purchasing |
It is important to note that on some versions Almera The ABS sensor is built directly into the bearing. In this case, replacing the bearing automatically replaces the sensor. If the sensor is replaceable separately, it must be connected carefully so as not to damage the contacts.
⚠️ Attention: Never use an impact wrench to fully tighten a hub nut, as this may result in bearing failure.
Using a torque wrench when tightening the hub nut is essential to prevent premature bearing wear.
FAQ: Frequently asked questions
Is it possible to replace only the bearing and not the hub assembly?
Theoretically it is possible, but in practice it is highly not recommended. For Nissan Almera G15 the process of pressing out the old and pressing in a new bearing requires complex tools. The risk of damaging the steering knuckle or the bearing itself during installation is too high. Replacing the hub assembly is safer and faster.
How long does a new bearing last?
When using high-quality spare parts (original or brands like SKF, SNR), the service life ranges from 80 to 120 thousand kilometers. However, operating conditions, road quality and driving style can significantly shorten this period.
What to do if the hub nut does not unscrew?
Apply a penetrating lubricant and give it time to work. Use a long wrench to increase leverage. As a last resort, you can gently heat the nut with a blowtorch, but do not overheat the brake rotor and caliper.
Do I need to do a wheel alignment after replacement?
Yes, after replacing the front wheel bearing and removing suspension elements, the geometry of the wheels may be disrupted. It is recommended to have a wheel alignment performed to ensure even tire wear and proper vehicle handling.