Noise reduction in “Old Friends”
— Citroen C5 driving noise elimination
Our car Citroen C5 has been known as an old friend for more than ten years. Recently, I feel that the driving noise is getting louder and louder. I feel that it is not the abnormal noise of the engine, nor is it much like tire noise and wind noise. anyway, it is a kind of “buzzing” noise that fills the car with the change of speed, which makes people upset.
Based on the analysis of the noise situation and searching the relevant cases of the network, it is considered that although the cause of the noise can not completely rule out the factors such as engine, oil, carbon deposition, tires and so on, the most likely cause is the bearing problem. This point was also confirmed in the communication and communication with some riders.
On a sunny morning, I drove our C5 from Deyang along Chengde Avenue to a shop in Chengdu that was familiar with the Citroen car system. The straight Chengde Avenue is flat and spacious, the C5 car gallops smoothly on the smooth paved road, and the heavy body and chassis coupled with single-guide extreme boot tires make drivers hardly feel any bumps and shakes. but it is this noise that is like countless bees circling and dancing in the trunk, so that people’s mood is not as cheerful as the weather.
Blue flowers and couplets are in full bloom on both sides of a clean and refreshing street in Chengdu’s Xindu district, and a connected car repair shop is set up on the side of the road. After simple pleasantries and exchanges, the shopkeeper, the veteran master, and his assistant began to inspect the vehicle. There is no single moth, everything is as expected, two pairs of front bearings no-load jitter and accompanied by abnormal noise, it can be determined to be the main cause of noise. These two sets of bearings are still the original parts of the original car. They have been working continuously for more than ten years, and it is time to retire.
Bearing replacement is very smooth, the use of NTN brand bearings, the master saw that the brake pads are almost worn, it is recommended to replace the four-wheel brake pads will also be changed to the original factory. Two pairs of bearings, four sets of brake pads, together with a total of 1900 rice, there is still a big discount compared to doing in 4S.
The return journey is still on Chengde Avenue, the sky is still blue, and the “old friend” C5 still runs fast and steadily, but the difference is that the car is much quieter.
On a sunny morning, I drove our C5 from Deyang along Chengde Avenue to a shop in Chengdu that was familiar with the Citroen car system. The traffic noise is like countless bees circling in the trunk, so that people’s mood is not as cheerful as the weather.
Blue flowers and couplets are in full bloom on both sides of a clean and refreshing street in Chengdu’s Xindu district, and a connected car repair shop is set up on the side of the road.
Veteran car repair shop, it is said that the owner veteran once worked in a Citroen 4S store in Beijing, and he also drives a Citroen C5. He is very familiar with this car.
After simple pleasantries and exchanges, the shopkeeper, the veteran master, and his assistant began to inspect the vehicle.
One stepped on the gas and the other listened.
There is no single moth, everything is as expected, two pairs of front bearings no-load jitter and accompanied by abnormal noise, it can be determined to be the main cause of noise.
Check before and after.
Feel very professional, but also very careful.
Remove the bearing seat.
The shaft end after removal.
Removed bearing seat.
Bearing seat, bearing inner and outer ring.
You can’t see anything with your eyes. The fault principle is that the bearing inner and outer rings and balls will produce deformation or clearance after long-term rolling extrusion and wear, and noise will be produced during high-speed rotation.
Eject the bearing on a 20-ton hydraulic press.
The new bearing uses the NTN brand bearing.
The old brake pads have been worn very thin.
New original brake pads
Start installing the bearing seat.
The brake pads have been replaced.
And then you can put the tires back.
The exhaust pipe is very clean and does not burn oil at all. The master said that it is a good habit to use the car.
Car wash, finish, test drive, everything OK!
The return journey is still on Chengde Avenue, the sky is still blue, and the “old friend” C5 still runs fast and steadily, but the difference is that the car is much quieter.
Thank you for reading!
TomService 
4 
September 3, 2024 
