What should I do if the spark plug can t be unscrewed, and what should I do if the spark plug can t

Warm up for 5 minutes, rest for 10 minutes, heat up for another 15 minutes, and then twist again. Thermal expansion, cold contraction for a while to loosen the carbon deposits of the silk teeth, and then thermal expansion begins to twist, and it is easy to unscrew it. If you still feel that it is very difficult to twist it, you can let the sleeve sleeve on the spark plug not be removed, so that the spark plug is cooler than the cylinder block, and the spark plug is faster to cold and shrink, so that it will be easier to unscrew it, and if it is not good, you can warm up the car and cool the car again.

If the car is not hot, even if the sleeve is broken, it can't be screwed down, and the spark plug is broken.

Use a special tool to unscrew the spark plug off, there is no special good way only to tighten it hard, if it is broken, then only lift the cylinder head to take the screw.

First use an electric welder to weld the screw on it to see if it can be removed, if you can't use the meson to gently introduce it outward, if it doesn't work, you can only remove the cylinder head!

Remove it forcefully with the spark plug sleeve, pay attention to two points: 1. Do not use other tools, such as: ordinary wrench 2, remove it counterclockwise, and the direction is not wrong.

The spark plug can't be screwed, and it can't be unloaded, so you can consider spraying some screw loosening agent, and then screw it after soaking for a while, and then tighten it tightly, and then unscrew it after a little activity. If you really can't screw it, it is recommended to go to a 4S shop or a professional repair shop to deal with it. If there is still no way to solve the problem, you can only choose to replace the cylinder.

When choosing a spark plug, the owner should choose the right size, and it must be selected according to the diameter of the spark plug. In most cases, cars use 16mm spark plug sleeves, but vans require 21mm spark plug sleeves. If it is a Japanese vehicle, it will be a little special, and it may only have a 14mm sleeve, which needs to be based on the actual size.

In the process of screwing the spark plug, it is necessary to pay attention to the fact that it cannot be screwed blindly or vigorously, otherwise it is easy for the spark plug to break or trip. Whether in the process of installation or disassembly, it is necessary to control the force, especially when installing the spark plug, it must meet the torque required by the spark plug.

If the spark plug metal thread part is broken on the cylinder head, the general auto repair shop will have a tool to take the screw, first prepare a screw tool slightly smaller than the inner diameter of the spark plug thread, and knock down the spark plug fracture properly, and then use a suitable connecting rod, a certain extension rod is needed to reach, counterclockwise rotation, according to this method to operate properly, most of the broken spark plug can be taken out, without dismantling the cylinder head.

After the broken spark plug is taken out, clean up the metal fragments in the cylinder with compressed air, and the new spark plug can be in accordance with the standard torque.

When the spark plug cannot be screwed, it is best to go to a professional repair shop or 4S shop for treatment, if there is really no way to solve it, you can only change the cylinder head. If it is broken, it is easy to trip and break the spark plug. Therefore, it is necessary to control the strength when disassembling or installing.

The spark plug has not been replaced for a long time, or the installation uses excessive torque, usually more than 40N·m, some spray rust remover, extended torque rod can not be removed, when disassembled forcefully may cause the metal shell of the spark plug to break, usually the metal thread part of the spark plug remains on the cylinder head. At this time, you need to use a reverse tooth screw removal tool, and you can generally take it out if you have mastered the skills.

When the spark plug is not screwed, it is best to go to a professional repair shop or 4S shop for treatment, if there is really no way to solve it, you can only change the cylinder head. If it is broken, it is easy to trip and break the spark plug.

This needs to be operated carefully, if it is not handled properly, it will be troublesome to break inside, you can spray some rust remover and tighten and loosen!

How to deal with the spark plug if it can't be twisted This needs to be operated carefully, if it is not handled properly, it will be troublesome to break it inside, you can spray some rust remover and tighten it and loosen it!

OK. When replacing the spark plug by ourselves, the force we use should be based on the torque required by the spark plug used, and the strength required by the spark plug of different sizes is different, for example, the 12mm spark plug generally uses a torque of 20-25Nm, while the 14mm spark plug generally uses a torque of 25-30Nm to tighten.

Therefore, when the owner replaces the spark plug by himself, the torque during installation is very important, neither too loose nor too tight.

If the torque of the spark plug installation is not enough, it is easy to cause oil leakage and air leakage, which affects the working condition of the engine; If the spark plug is tightened too tightly, it is easy to cause tripping or twisting.

Installation precautions.

1. Choose a spark plug that matches your vehicle.

2. Professional tools are required when disassembling and assembling spark plugs.

3. In the process of disassembly and assembly, we should pay attention to the method, and brute force can not be used, such as when installing the spark plug, the spark plug is the corresponding torque, and professional tools should be used to adjust the torque and tighten the spark plug.

The size of the spark plug sleeve should be selected according to the diameter of the spark plug. In most nuclear situations, cars use 16 spark plug sleeves, bread ruler sheds use 21 spark plug sleeves, and Japanese cars are more special, using 14 long sleeves. This is a reference, and ultimately it is up to the actual size of the spark plug to choose.

When the spark plug does not move, it is best to go to a professional repair shop or 4S shop to deal with it. If there is really no way to solve it, you can only replace the cylinder head. If it is difficult to break, it can easily cause the spark plug to trip and break.

Therefore, whether it is disassembling or installing, it is basically necessary to be proficient in strength, especially when installing, to meet the torque required by the spark plug.

It is not difficult to replace the spark plug, and the owner can install the Linghe by himself. However, there are some things that need to be paid attention to during the installation process, and you need to observe them carefully, otherwise it is easy to cause some impact.

1.Choose a spark plug that matches your vehicle;

2.Professional tools should be used when disassembling spark plugs;

3.Pay attention to the method in the process of disassembly and assembly, and do not use brute force. For example, when installing a spark plug, the spark plug has a corresponding torque, and the spark plug should be tightened with a professional tool.

Especially the strength required for installation, if the installation torque of the spark plug is not enough, it is easy to cause oil leakage and air leakage, which affects the working state of the engine; If the spark plug is tightened too tightly, it can easily cause tripping or unscrewing.

Here is the process of installing the spark plug.

1.Screw the spark plug into the cylinder head by hand to avoid twisting;

2.Use a wrench to quickly screw the spark plug into the cylinder head. Don't use too much force, the sealing face can be attached to the cylinder head.

3.Tighten the spark plug with a wrench according to the limited torque.

Pacific Automobile Network] spark plug can not be screwed processing method: it is recommended to spray some screw loosening agent, soak it for a while, and tighten it loosely and move to screw it off, but do not over-screw it, twist it in the opposite direction if it can't be screwed, and move it a few more times.

Spark plugs, commonly known as fire nozzle picks, are used to discharge the pulse high-voltage electrical discharge from the high-voltage wire, break through the air between the two electrodes of the spark plug, and generate an electric spark to draw the mixed gas in the gas cylinder. The main types are: quasi-type spark plugs, edge body protruding spark plugs, electrode type spark plugs, seat type spark plugs, polar type spark plugs, surface jump fire type spark plugs, etc.

The function of the spark plug is to introduce tens of thousands of volts of high-voltage electricity into the combustion chamber, and generate an electric spark to ignite the mixture, and cooperate with the ignition system and oil supply system to make the engine work, which determines the performance of the engine to a large extent.

The main parts of a spark plug are an insulator, a housing, a wiring screw, and an electrode. The insulator must have good insulation and thermal conductivity, high mechanical strength, and be able to withstand high-temperature thermal shock and chemical corrosion, and the material is usually 95% alumina porcelain. The housing is made of steel, and the functional limb branch height is to fix the spark plug to the cylinder head.

The dimensions of the hexagonal threads of the housing have been incorporated into the ISO international standard. The spark plug electrode consists of a center electrode and a side electrode, and the spark gap between the two is the spark gap. The size of the clearance directly affects the starting, power, working stability and economy of the engine.

A reasonable gap is related to the ignition voltage. The electrode material must have good resistance to electrical erosion (spark ablation) and corrosion (chemical-thermal corrosion), and should have good thermal conductivity. Between the central electrode and the wiring screw is a conductor glass sealant, which must be able to conduct electricity and withstand the high pressure of the combustion of the mixture, while ensuring its tightness.

Photo by Pacific Automobile Network Zeng Caihong).