The quality of automobile roads contributes to the fact that tires are often damaged. In the most serious cases, the tire will have to be replaced, but sometimes the defect can be repaired, and right in the field. And sometimes you have to go to a company that deals with heavy machinery removal. Today we will talk about tire repair.
Most often, the tire gets a puncture by a nail or self-drilling – through damage of a small size (up to 3 mm). Once the foreign body leaves the punctured cavity, the tire will begin to deflate intensely, because before the hole was closed by an object that prevented the final release of air. If one wheel has to be pumped up more often than others, it is a sure sign of a puncture, just a foreign body is still in the tire, so the etching of air goes small portions.
The puncture can be small, when after the removal of the foreign body the edges of the hole converge. The tire cords are not severely damaged, so the purpose of the repair is to make the tire airtight. Use a special patch for this purpose, and use the cold chemical vulcanization method.
If the hole is visible, it is a sign of severe damage to the cords as a result of a large puncture or cut caused by hitting glass, a sharp metal object, or a curb. The filaments of the cords are then torn and the tightness of the seals is severely compromised. In this case, without the help of an employee of a tire fitting or service station is not possible. If the cut is very big, but there is a chance to patch it, it is better not to be stingy and buy a new tire. After all, even a large hole that is patched reduces the reliability of the tire. It will not reach the norms of balancing, and as a result, it may cause an accident.
The answer to the question of whether this wheel can be repaired can only be given by a service worker, taking into account the location of the damage, the size and his level of skill. For example, a puncture in the tread should be repaired with a cord patch and hot vulcanized.
The occurrence of a “hernia” – a ballooning of the tire surface – is a consequence of the detachment of the outer rubber layer from the cords and the breaking of the threads in the tire carcass. As a result of the first reason air enters the formed cavity, which leads to irreversible consequences in the behavior of the tire. The second cause leads to equally serious consequences. Whole strands of the carcass will experience additional stress during use due to the rupture of some of the adjacent strands. They will gradually tear and the “hernia” area will increase. If the tire is not repaired in time at the service station, the process will cause the wheel to burst. Upon arrival at the car service, ask the employees not only to repair the tire, but also to make the procedure of camber-convergence at low cost in St. Petersburg or other region. After all, the operation of the tire with a “hernia” could adversely affect the orientation of the wheels of the car.
Another defect is a violation of the geometry of the tire without loss of tightness. The most common causes are:
defect in manufacturing;
improper tire mounting after seasonal tire storage;
errors in tire operation (excessive air pressure in the tire, driving too fast on bad pavement, hitting a curb, etc.).
The presence of this defect is evidenced by the release of cords outward or inward of the tire, changes in the shape of the racetrack, etc.
Repair of car tires
First, determine and mark the location of the defect. It is better to remove the tire and mark the damage outside and inside. Remove the foreign body (if any) and thoroughly clean the area around the defect with a brush and a special liquid. Dirt and foreign bodies will reduce the sealing results.
In the case of a road repair (when the work was done without disassembling the tire), keep in mind that this procedure will have a temporary effect to last until the end of the trip. At the earliest opportunity, have the tire repaired with the tire removed from the wheel.
Tire sealants are an invaluable aid in repairing tires. These can be used to repair small punctures. After that, be sure to increase the tire pressure to normal.
Another option is the use of damp rubber, but to work with this material you must preheat it to 140-150 degrees, so this method is resorted to only if the others were ineffective. If the cords are damaged, a reinforced patch is placed on the inside with a special cold vulcanizing layer on one side. If the inside of the tire is damaged, use a so-called universal patch.
A rubber “foot” will help repair the treadway. It is shaped like a cylinder, one end of which is made in the form of a special profile. “Mushroom” is formed by docking the “foot” and the universal patch and is installed on the inner surface of the tire. This is best when you are dealing with a small hole perpendicular to the tire surface.