How tight should I change the spark plug by myself?Schematic diagram of spark plug tightening force

When replacing the spark plug by ourselves, the force we use depends on the torque required for the spark plug used. The force required for spark plugs of different sizes is different. For example, a 12mm spark plug generally uses a torque of 20-25N/m, while a 14mm spark plug generally uses a torque of 20-25N/m. The spark plug is generally tightened with a torque of 25-30N/m. Therefore, when the car owner replaces the spark plug himself, the torque during installation is very important, and it cannot be too loose or too tight.

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

Schematic diagram of spark plug tightening force

Steps to install spark plug

1. Screw the spark plug into the cylinder head by hand to prevent random buckling;

2. Use a wrench to quickly screw the spark plug into the cylinder head. Don't use too much force, just fit the sealing surface with the cylinder head;

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

The replacement of the spark plug is not difficult. The owner can install it by himself, but there are some problems in the installation process.Precautions, It needs to be observed carefully, otherwise it is easy to have some influence.

1. Purchase spark plugs that match your own vehicle;

2. Professional tools are needed when disassembling and assembling spark plugs;

3. Pay attention to the method during the disassembly and assembly process, and cannot use brute force. For example, when the spark plug is installed, the spark plug has a corresponding torque, and professional tools should be used to adjust the torque and tighten the spark plug.