Four misunderstandings of car maintenance
Myth 1: The oil is more than enough
The oil in the crankcase cannot be added more or less, and excessive oil will increase the rotational resistance of the crank-link mechanism and increase the amount of oil splashed onto the cylinder wall. Excessive oil can cause carbon deposits in the combustion chamber to increase, and engine power is reduced, which can affect emissions. When checking or adding oil, the owner should add according to the scale on the oil scale. The oil level should not exceed the upper limit of the scale. The minimum can not be lower than the scale. The oil level is usually added to the middle of the two scales. More appropriate.
Myth 2: Tire pressure can not be low
Some car owners like to charge the tires at a high pressure, which is considered to be both overloaded and fuel efficient. This is not true. Excessive tire pressure will reduce the ground contact surface of the tire and increase the tread wear, which will reduce the braking effect during braking, which will affect the driving safety. Too low tire pressure is not good. In addition to affecting driving safety and braking effect, low air pressure will also accelerate the wear of the shoulder and increase the fuel consumption of the vehicle. When the owner uses the air pump to inflate himself, he should inflate according to the air pressure specified by the manufacturer. The tire pressure label is usually located on the body or the fuel tank cap.
Myth 3: Wheel screws are tight and not loose
According to the diameter, pitch and use, the bolts of various parts of the car have corresponding tightening torques. If the specified torque is not reached, the bolts will loosen. If the tightening torque exceeds the tightening torque, the bolts will be elongated. Before tightening the components, it is necessary to grasp the tightening torque of each bolt, such as wheel bolts. Generally, the tightening torque of the car tire bolts is between 100-130 N·m.
Myth 4: Attachment belt is tight and not loose
Some car owners believe that increasing the tension of the accessory belt can improve the cooling effect of the compressor and the power generation of the generator, so the tension of the belt is increased steadily, and this is wrong. The accessory belt should maintain proper tension, because too tight a belt will overload the bearing, shorten the service life of the part, and cause the belt to break, which will eventually affect the normal use of the vehicle.