The situation of walking up to a car and finding that the wheel is not being removed because of a lost secret bolt key is familiar to many drivers, especially when buying used cars. Secrets. They are installed to protect the wheels from theft, but often become a headache for legitimate owners who have forgotten where the special adapter was put. Attempting to tear off such a bolt with a normal head can lead to damage. cast-disc or the breaking of the edges, which will complicate further extraction.
There are several proven ways to solve this problem in garage conditions, without contacting the service, where a round sum can be requested for the service. The choice of method depends on the type of secretion, the state of the thread and the presence of a special tool at hand. In this article, we will discuss effective techniques that will help you. maintain the integrity of the hub threadEven if the bolt itself has to be destroyed.
Before taking action, it is necessary to assess the scale of the disaster and prepare the workplace. Do not immediately grab a Bulgarian or welding machine, without trying gentle methods. The right sequence of actions will save you time and nerves, and will also avoid damage to expensive suspension components.
Workplace preparation and situation assessment
First, you need to ensure safe access to the wheel. The car should be safely raised on the jack and mounted on safety supports, as you will have to make considerable physical effort. Remove the cap if there is one and clean the disc niche of dirt to see the configuration cock-bolt. Visual inspection will help determine how deep the head is planted and whether there is access to the faces.
You’ll need a basic set of tools: a long-handled collar, a set of heads, perhaps a hammer, and a penetrating lubricant like WD-40. Treat the problem bolt with a "vedeshka" and let it work for 10-15 minutes. This will soften the oxides and make it easier to turn around, especially if the car has been standing for a long time.
⚠️ Warning: Never try to unscrew the bolt while the wheel is hanging on weight without fixing. With a sharp breakdown of the secretion, the car can jump off the jack, which will lead to injuries.
If standard methods do not help, we will have to move to more radical measures. It is important to understand that in most cases the secret itself will not be saved, and the main goal is to preserve the secret. hub-carving and the geometry of the disk. Evaluate your strength and the tools available before choosing a dismantling strategy.
Method of shock-imposition of a standard head
This method is the most common and often allows you to solve the problem without buying an expensive tool. The essence of the method is to pick up a conventional head, which is slightly smaller or equal to the outer diameter of the secretion, and forcibly (forced) to plant it on the bolt.
Take the head 17, 19 or 21 mm (depending on the size of your bolt) and hold it to the secret. A sharp and strong blow of the hammer on the end of the head try to plant it on the edge or the bolt body. The metal of the secretion should deform and “bit” inside the head, creating a rigid coupling.
- 🔨 Pick a head that tightly covers the secretion, but does not hang out.
- 🔨 Apply 2-3 strong blows with a hammer to cut the edges of the head into the bolt body.
- 🔨 Carefully, without jerking, try turning the collar counterclockwise.
This method often allows you to unscrew the bolt the first time. If the head breaks, repeat the procedure, it may be worth trying the head of the neighboring size. The main thing is not to overdo it, so as not to split. cast-plate from excessive effort or impact.
If the secretion has a complex shape with floating elements, this method may not work, since the head will have nothing to catch on to. In this case, you will have to move to the use of specialized detachers or welding.
Use of a gas key or pipe clutches
If the head of the secretion protrudes above the level of the disc and has a sufficient height, you can try to capture it with a powerful movable key or pipe visors. This method is effective for simple cylindrical secretions.
As tightly as possible, squeeze the key sponges on the bolt body. Make sure the grip is reliable and start spinning slowly. Fluency is important here: a sharp jerk can rip the key and damage neighboring elements or even your finger.
To increase the effort, you can use a lengthener tube on the key handle. However, remember about the strength of the metal: if you overdo it, you can roll the bolt head itself, leaving its body in the hub, which will greatly complicate the task.
⚠️ Note: When using the gas key to forged or alloy-disc Be very careful. Sliding the tool can leave a deep scratch or chip on the rim, spoiling the appearance of the wheel.
This method is good because it does not require special skills of welding or working with extractors. However, it is only applicable when the geometry of the secretion allows for a reliable capture by an external instrument.
Application of extractors for bolt-twisting
If the soft methods do not help, help comes. extractor A specialized tool for removing broken bolts and studs. This is the most professional approach to minimize damage.
The process begins with drilling a small hole in the center of the secretion. This will require a drill and a drill on metal (preferably cobalt). The diameter of the drill should correspond to the size of the extractor tail.
☑️ Algorithm of working with extractor
After drilling, an extractor is clogged into the hole (cone screw with left thread). When rotating counterclockwise, the extractor screws into the bolt body and unwraps it, providing reliable grip. Then there's a smooth twist.
It is important to drill strictly in the center, so as not to damage the thread of the hub. If you do not have experience with a drill, it is better to ask for help from a more experienced friend or use a guide sleeve.
| Type of extractor | What bolts? | Difficulty of use |
|---|---|---|
| The rod. | Small diameters | High (precise drilling required) |
| Conical screw | Medium and large | Medium (most popular) |
| Granite | Strongly corroded bolts | Low (just score and spin) |
Using an extractor guarantees results in 99% of cases, if there are no errors in drilling. It's the best choice for the expensive. diskwhere the risk of damage should be reduced to zero.
Welding as a radical method of dismantling
The welding machine is a “heavy artillery” in the fight against boiling secrets. The method is based on the fact that a nut or piece of reinforcement is welded to the protruding part of the bolt, which serve as a lever for twisting.
You will need a welding machine (preferably a semi-automatic), a nut of the appropriate diameter and protective equipment. The nut is carefully welded to the secret. It is important not to burn through the disk and not to boil metal on the disk itself.
Why is welding effective?
The high temperature during welding helps to “release” the threaded connection, destroying oxides and rust, which greatly facilitates the twisting of the bolt even without strong mechanical effort.
After cooling the seam (not full, but to the metal grabbed) the nut is put on the neck and twisted. Thermal expansion often works wonders, allowing even the most bolts to be ripped off.
This method requires welding skills. If you have never held welding in your hands, it is better not to experiment, since there is a risk of thermally damaging the disc or leaving it with ugly metal flows, which will then have to be grinded.
For cast-disc This method is suitable with caution: aluminum does not tolerate local overheating and can crack. Use short welding pulses to let the metal cool.
Drilling and refining of threads
When nothing helps and the bolt head has already been destroyed by previous attempts, only a complete drill remains. This is an extreme measure that requires accuracy and a good tool.
The bolt is drilled with drills of gradually increasing diameter until the walls become thin. Then the residues are neatly knocked out or removed with a thin chisel. The main task is not to touch the thread of the hub.
After removing the bolt body, be sure to check the state of the thread in the hub. Run it with a tag or just screw a new bolt (without a secret) for inspection. If the thread is damaged, it will need to be repaired, which can be expensive.
Buy a set of new bolts or nuts immediately after dismantling, as the old ones are likely to be damaged in the extraction process.
After successfully dismantling all problem bolts, it is recommended to replace the secretaries with new ones with a new set of keys or completely abandon them in favor of standard bolts, if the risk of wheel theft in your area is minimal.
Do not forget that after all the work, you need to check the tightening of all wheel bolts with a dynamometer key through 50-100 km of run. This is critical for traffic safety.
Frequently Asked Questions (FAQ)
Can I unscrew the secret without damaging the disk?
Yes, this is possible if you use the extractor method or carefully selected head. Welding and rough drilling carry great risks of damage A cast disc.
What to do if the edges are sliding on the secret?
If the faces are slimmed, the method of planting the head may not work. In this case, the most effective welding (welding the nut to the residues) or drilling with the subsequent use of the extractor.
Where can I find a code to recover the secret key?
The code is usually indicated on a plastic tag, complete with secretions, or on a special map. If you bought a used car and there is no code, it is almost impossible to restore the key by marking on the bolt - it is easier to buy a new kit.
Why can't you just break a secret with a chisel?
An attempt to split the secretion with a chisel often leads to damage to the landing place on the disk or hub. In addition, modern secretions are made of durable hardened steel, which is difficult to crack without the risk of damage. aluminum-alloy CD.
The safest and cleanest way to remove a secret is to use a high-quality extractor, which requires preliminary drilling of the bolt center.