One day in early January, a Mazda 3 came to the factory for inspection. The fault described by the owner was: When driving on a flat road, the chassis always hummed. Is there no sound when the road is uneven? The owner said that there is not only a buzzing sound when the road is uneven, but also other sounds. Let's solve the buzzing sound when driving on a flat road.
So, the master first tested the car. At low speeds, a clear buzzing sound can be heard at the right front wheel position, and the sound is louder at high speed, but there is no such sound at the left front wheel position. According to the test run, the master initially judged that there was a problem with the right front wheel bearing. For further confirmation, the master raised the car and quickly turned the right front wheel with both hands. A humming sound could be heard, which confirmed the fault and the bearing problem!
Chassis humming faults are common in maintenance, and many of them are bearing problems. Other problems cannot be ruled out. After the bearing has problems, the bearing cannot be repaired, and the bearing can only be replaced with a new one. Mazda owners also agreed to replace it. As shown in the figure below, the master has removed the right front wheel, and the brake cylinder assembly shown by the green arrow has also been removed.
If you want to remove the right front bearing, you need to remove the right front steering knuckle first, and it is difficult to remove the steering knuckle separately. The master decided to remove the steering knuckle and shock absorber together. As shown in the green area in the figure below, these three screws fix the upper cover of the shock absorber. Remove them to remove the shock absorber and steering knuckle.
As shown in the figure below, this is the removed steering knuckle and shock absorber. The next job is to separate them. Remove the one screw at the position shown by the orange arrow.
As shown in the figure below, this is the right front after the shock absorber and steering knuckle are removed. 1 is the steering tie rod ball head, 2 is the lower arm ball head, and 3 is the half Out-of-axis ball cage, 4 is the brake cylinder assembly.
As shown in the figure below, the steering knuckle and the shock absorber have been separated, and the steering knuckle position in the green area is installed under the shock absorber in the orange area. The next job is to remove the bearings inside the steering knuckle.
How to remove the bearings inside the steering knuckle? Under normal circumstances, it is necessary to use a press to press out the bearing, because the installation of the bearing inside the steering knuckle is particularly firm. However, a master in the factory felt that the press was troublesome and had to try it with a hammer. As a result, there was no response after more than ten hits.
So the master put the steering knuckle on the press and decided to use the press to press out the bearing. As shown by the arrow in the figure below, the master is placing the steering knuckle. This is a bit more difficult and must be aligned and supported firmly.
After more than half an hour of hard work, the master installed the new bearing inside the steering knuckle, as shown in the figure below. As shown in the green area, this is where the wheel speed sensor is installed to measure the bearing speed, which is the wheel speed. This bearing also belongs to the integral type, that is, the shaft head and the bearing are together.
After the master installed the steering knuckle and the removed parts, there was no previous buzzing noise during the test drive, and the problem was solved. This failure phenomenon is very common. Many cases have been written, and various types of cars may encounter it. Only by replacing the new bearing can the problem be solved. Car friends simply understand it. Welcome to pay attention to the WeChat public account "Maintenance Worker Xiaowu"
This article comes from the author of Autohome and does not represent the viewpoint of Autohome.
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