The tire was not punctured by a nail, but leaked for a long time. What happened?

First of all, when the tire leaks, it is necessary to rule out whether it is punctured. Of course, if your car is a vacuum tire, the one without an inner tube. One of the great advantages of a vacuum tire is that the air in the tire will not flow out immediately after the tire is punctured. The inserted object will be closely combined with the carcass. Of course, slow air leakage is inevitable, especially if the tire is punctured by a straight nail, not a screw. The nail may have been stuck for a month without knowing. The tire leaks slowly, but it will leak faster if it is punctured by a screw.

If it is found that the tire is still leaking, it is necessary to check the position of the valve. The whole valve sealing ring is a place where tires are very prone to aging and air leakage. The inspection method can be to pour a little soapy water on the valve. If there is a leak, bubbles will appear on the soapy water. Upon inspection, the valve did leak. The rubber gasket in the valve may be damaged. It is best to replace the rubber washer.

In addition to checking the above two places, there may be slow air leakage at the joint between the tire and the hub. The first reason for the slow air leakage in this place is the hub problem. For example, when parking, the wheel hub will be scratched and deformed by road teeth. If the hub is really slightly scratched and deformed, slow air leakage caused by poor air tightness is inevitable. This kind of situation can only be found by taking the whole tire down and throwing it into the water to find out where it leaks.

The second situation is that if the car is more than three years old, especially some cars with poor parking environment, such as nearby chemical plants and places with serious salinity, these places have been parked for a long time, and the car has been used for several years, the seal between the wheel hub and the tire will peel off, corrode and rust, and slow air leakage will naturally occur at this time. The solution to this situation is usually to scrape off the tire, polish the inside of the wheel hub after scraping off, and then polish the tire skin or directly replace the tire, so that the problem is solved.

Finally, it is concluded that if the hub deformation leads to air leakage, it is suggested that you can consider replacing the hub. If the car is a full-size spare tire, it is easier to operate. You can peel off the spare wheel hub and install it. Another reliable method is to install a car inflator, just like when you are driving. If the tire is flat, you can use a spare tire. In addition, low-speed air leakage caused by slight deformation of the hub can also be used. There are not many hidden dangers in driving. Of course, serious air leakage is not feasible. In fact, it is only a matter of time before the tire leaks. However, if you say that your tire has dropped from 2.5 to 1.8 in half a month, it will still leak faster. It is recommended to deal with it in time. But if it takes three months to adjust from 2.5 to 2.0, it is actually the loss of normal fetal gas. If the problem is not serious, just take a breath.