Does Land Rover Range Rover Match Ventilation to Reduce Consumption?

Matching skill

First, check whether the product provides elevation requirements of 2-3 inches. Some products only provide an elevation of 2 inches. After barely using the elevation angle of 3 inches, it is easy to pull to the limit in cross-country and cause damage.

Second, whether the diameter of the central telescopic rod of the shock absorber can reach 16 mm or more is a basic index of strength.

Thirdly, whether the upper and lower connecting sleeves of the shock absorber are high-strength polyurethane sleeves is also an important basis to ensure long-term high-strength use, because ordinary rubber is difficult to use for a long time under high strength.

The shock absorber is mainly used to suppress the shock of spring rebound after shock absorption and the impact from the road surface. When passing through the uneven road surface, although the damping spring can filter the vibration of the road surface, the spring itself will reciprocate, and the shock absorber is used to suppress this spring jump. If the shock absorber is too soft, the car body will jump up and down. If the shock absorber is too hard, it will bring too much resistance and hinder the normal work of the spring. Shi Xiaohui said that during the modification of the suspension system, the hard shock absorber should match the hard spring, and the hardness of the spring is closely related to the weight of the car, so heavier cars generally use hard shock absorbers. It is necessary to constantly try to design the best combination scheme of shock absorber and spring during modification. Professional refit shops can generally find the most suitable ones for car owners.

Fault and maintenance

examination

In order to quickly attenuate the vibration of the frame and body and improve the ride comfort and comfort of the car, the suspension system of the car is generally equipped with shock absorbers. At present, double-acting cylindrical shock absorbers are widely used in automobiles.

Shock absorber is a vulnerable part in the process of automobile use, and its working quality will directly affect the ride comfort of automobile and the life of other parts, so it is necessary to keep the shock absorber in good working condition at all times. You can check whether the shock absorber works well in the following ways.

First drive on the road with bad road conditions 10km, then stop the car and touch the shell of the shock absorber with your hands. If it is not hot enough, it means that there is no resistance inside the shock absorber and the shock absorber does not work. At this time, appropriate lubricating oil can be added and then the test can be carried out. If the shell is hot, it is the lack of oil inside the shock absorber, so it is necessary to add enough oil; Otherwise, the shock absorber is invalid.

Second, press the bumper hard and then release it. If the car jumps 2~3 times, the shock absorber works well.

Third, if the car vibrates violently when it is driving slowly and braking urgently, it means that there is something wrong with the shock absorber.

4. Remove the shock absorber and erect it, clamp the lower connecting ring on a vise, and press the shock absorber rod hard for several times. At this time, there should be stable resistance, and the resistance of pulling up (restoring) is greater than the resistance of pressing down. If the resistance is unstable or there is no resistance, it may be that the shock absorber is short of oil or the valve element is damaged, so the parts should be repaired or replaced.

repair

After determining that there is a problem or fault with the shock absorber, first check whether the shock absorber leaks oil or has traces of old oil leakage.

The oil seal gasket and gasket are damaged, and the oil tank cover nut is loose. It may be that the oil seal and sealing washer are damaged and failed, so a new seal should be replaced. If the oil leakage still cannot be eliminated, pull out the shock absorber. If you feel that there is a hairpin or the weight is different, further check whether the gap between the piston and the cylinder is too large, whether the piston connecting rod of the shock absorber is bent, and whether the surfaces of the piston connecting rod and the cylinder are scratched or scraped.

If there is no oil leakage from the shock absorber, check the connecting pin, connecting rod, connecting hole and rubber bushing of the shock absorber for damage, desoldering, cracking or falling off. If the above inspection is normal, the shock absorber should be further disassembled to check whether the fit clearance between the piston and the cylinder is too large, whether the cylinder is tight, whether the valve seal is good, whether the disc is tightly attached to the valve seat, and whether the extension spring of the shock absorber is too soft or broken. Repair by grinding or replacing parts as appropriate.

In addition, the shock absorber will produce noise in actual use, which is mainly caused by the collision between the shock absorber and leaf spring, frame or shaft, damage or loss of rubber pad, deformation of dust-proof pipe of shock absorber, oil shortage and other reasons. The cause should be found out and repaired.

After inspection and repair, the shock absorber should be tested on a special test bench. When the resistance frequency is 100 1 mm, the resistance of its extension stroke and compression stroke should meet the requirements. For example, the maximum resistance of CAl09 1, the extension stroke is 2 156~2646N, and the compression stroke is 392 ~ 588 N; The maximum resistance of Dongfeng motor is 2450~3038N in extension stroke and 490~686N in compression stroke. ..

If there are no test conditions, you can also use the empirical method, that is, use an iron bar to penetrate the lower end of the shock absorber, step on both ends with your feet, and hold the upper ring with both hands and pull it back and forth for 2~4 times. When pulling up, the resistance is great, and when pressing down, it doesn't feel laborious. The tensile resistance is restored compared with that before repair, and there is no idling feeling, indicating that the shock absorber is basically normal.