Failure to solve the chassis abnormal sound

Failure to solve the chassis abnormal sound
First, the car driving on a flat surface some distance, so that the rear axle of the temperature rose to normal, then abnormal sound when the vehicle is moving, note the speed, parking, and placing the transmission in neutral position, then slowly speed up until the engine speed and vehicle speed when there abnormal sound quite, the observation of the occurrence of any abnormal sound can be repeated several times to determine whether the abnormal sound of the exhaust or engine caused by an abnormal condition.
Rear axle noise, tire noise and the resolution
With the road and tire noise is changed, the rear axle noise is not. When the vehicle speed is below 48km / h, the rear axle noise disappear, but the tire noise will continue to exist. The car is moving and sliding, the tire noise is the same, but the rear axle of the noise is different.
Wheel bearings rear axle abnormal sound and noise resolution
The car is moving and sliding, the front wheel bearing noise constant, such as maintaining constant speed and brake slightly applied, can reduce the wheel load bearing part of the load, which can weaken the noise, the noise source from where you can find.
When the speed is greater than 48km / h, unless severely damaged the rear axle, rear wheel bearings under normal circumstances few could hear the noise, the car slide, or neutral, the dehiscence of the rear wheel bearing will have a "rumbling" sound, and erosion The rear wheel bearings are issued a "rustling" sound.
Bearing and differential gear bearing cone initiative to distinguish abnormal sound
Reducer bearings usually produce harsh "rumbling" sound or "quack" sound, the sound the beat steady, with the speed of change.
Gear reducer cone bearing sound in the car before the big slide when the latter bearing the larger noise in the driving.
Differential bearing noise is usually a constant ear-piercing sound, but it beat than the gear reducer tapered bearings to ease the noise is much more.
Rear axle gear noise to distinguish
In the normal straight line driving, the axle gears and planetary gear differential is almost no relative motion, so can not hear the noise.
Car moving process, the rear axle gear occurred mostly because of abnormal sound caused by poor lubrication, resulting in scar reducer gear grind, if the sliding speed in a variety of abnormal sound can be heard, then by the reducer gear nut loosening caused.
Low speed, rear axle parts occurred percussion, acceleration or deceleration, especially given the abnormal sound dull. The failure from one or more found the following reasons:
Differential axle differential gear journal and the shell gap inappropriate.
Differential cross shaft journal and the differential shell mismatch.
Axle differential gears meshing with the planetary gear backlash properly.
Differential cone active and passive gear mesh backlash properly.
Thrust washer wear.
Vehicles, the occurrence of abnormal sound due to the rear axle gear mesh gap properly, differential bearing pre-load adjustment added improper or both. Exclude abnormal sound, the need to open checking differential gear reducer gear meshing with the gap, cone reducer gear bearing pre-load and increase exposure to traces of the gear reducer.