Abnormal noise from the cold start belt is caused by friction between the timing belt and the timing cover. This problem can cause premature damage to the timing belt. If broken, it will damage the engine valve and require servicing. The water pump makes an abnormal noise. However, most also occur when the car is hot. If the sound is not loud, you can ignore it. If the generator belt is replaced or the generator tensioner is in 9 weeks/
What is the cause of the abnormal noise of the cold starting belt?
The abnormal noise of the cold start The belt is caused by the timing belt and the timing belt caused by friction between the covers. This problem can cause premature damage to the timing belt. If broken, it will damage the engine valve and require servicing. The pwater pump makes abnormal noise. However, most also occur when the car is hot. If the sound is not loud, you can ignore it. If there is any abnormality when replacing the generator belt or replacing the generator tensioner at 9 weeks/6 years.
As long as the sound is not loud, it can be ignored. And it will not affect the life of the belt. Even if it breaks down, it can be replaced immediately before the battery runs out. Generally, other parts will not be lost. Only when the steering is broken will the booster pump not work. Method to confirm whether the generator belt is abnormal: Before starting, pour water on the generator belt, turn it on and the vibration noise will disappear. After the water dries for 1 or 2 minutes, the squeaking reappears. Pour more water and the abnormal noise will disappear.
The belt is ahe piece that we all tend to neglect. As a general rule, we will not replace belts unless they are broken or obviously abnormal. However, the drive belt is a very important element. If the belt breaks during autonomous driving or long-distance driving, our vehicle will have to break down and wait for help.
The cold start cylinder knocking noise disappears when the car is warm
The cold start cylinder knocking noise will disappear after a while, which belongs to the knocking of the engine cold start cylinder. It is characterized by a rhythmic metallic knocking noise when the upper part of the engine is idling after a cold start. It disappears when the accelerator is accelerated slightly. It also weakens or disappears when engine temperature increases.
The main reason for this phenomenon is thate the piston and the cylinder wall are poorly lubricated when the engine starts cold, or the fitting gap between the piston and the cylinder wall is too large, or the piston cylinder is too large, which causes the piston to work instantly in the high pressure gas. Under the action of pressure, it oscillates in the cylinder and hits the cylinder wall, producing a metallic knocking sound.
Additionally, the piston and cylinder materials will also affect this sound. If they are made of the same material, such as aluminum alloy or cast iron, this noise is relatively low or virtually non-existent. If the piston is made of aluminum alloy and the cylinder is made of cast iron, this noise is more common. There is a diesel engineering vehicle here. The original car has cast iron pistons and the cylinder has virtually no cold knock. Later, after the mechanical failure was repaired, it was replaced with aluminum.Pistons made of alloy, the cold blow on the cylinder becomes very obvious, this is the material factor.
Generally speaking, this situation rarely occurs when new cars start cold. If this phenomenon occurs after the engine ages, it means that the internal parts of the engine are aging and the matching gap between the piston and the cylinder wall is large, which will cause loud noise. What is the reason for abnormal belt noise during cold start? Cylinder knocking noise on cold start disappears when car is warm @2019
Why do car headlights always turn off?
1. Unbalance of the rotating part:
Mainly caused by the unbalance of the rotor, coupler, coupling and transmission wheel (brake wheel).
The solution is to first find the balance of the rotor. If there is a bighe drive wheels, brake wheels, couplers and couplings, they must be balanced separately from the rotor. Another reason is that the rotating part is mechanically loose. For example: loose iron core supports, loose wrenches and skew pins due to failure, and loose rotor attachment will all cause the rotating part to become unbalanced.
2. Electrical failure: caused by electromagnetic reasons
Mainly includes: AC diesel generator stator wiring errors, wound asynchronous motor rotor winding short circuit, synchronization. excitation winding of the diesel generator set, the connection of the excitation coil of the synchronous diesel generator set is incorrect, the rotor of the cage asynchronous motor is broken, and the deformation of the rotor core causes uneven air gaps between the stator and the rotor, which results in un air gap flow unbalanced and causing vibrations.
3. Mechanical failures mainly include the following:
1. The linkage shaft system is misaligned, center lines do not match and centering is incorrect. The main cause of this failure is poor alignment and installation during the installation process. Another situation is that the center lines of some connecting parts coincide in the cold state, but after a certain operating time due to the deformation of the rotor fulcrum, foundation, etc., the center lines are destroyed again, causing vibrations. .
2. The gears and couplings connected to the generator are defective. This type of failure is mainly manifested by poor meshing of the gears, significant wear of the gear teeth, poor lubrication of the opposite wheel, asymmetrical couplings.loose and misaligned, incorrect tooth shape and pitch of the gear coupling, excessive play or significant wear, all of which will cause certain problems.
3. Structural defects and installation problems of the generator itself. This type of failure mainly manifests itself as an elliptical journal, a bent shaft, too large or too small a gap between the shaft and the bearing, insufficient rigidity of the bearing seat, foundation plate, parts of the foundation and even the entire foundation of the generator installation, and the gap between the generator and the foundation plate. Joints are not securely fixed, leg bolts are loose, bearing seat and base plate are loose, etc. If the gap between the shaft and the bearing is too large or too small, it may not only cause vibration but also cause lubrication and temperature abnormalities.u pad.
4. The load driven by the silent generator conducts the vibrations. For example: steam turbine generatorThe turbine of the generator vibrates, and the fan and water pump driven by the generator vibrate, causing the generator to vibrate.
1. The quality of headlight bulbs is problematic, so remember not to be cheap.
2. Circuit problems. This probability is very high. It should be caused by a short circuit or load problem on the line itself.
Car lights are an indispensable part of the car and ensure the safety of the car when driving at night. Car bulbs are consumables and have a limited lifespan. Generally speaking, bulbs need to be replaced every 50,000 kilometers, or about two years, otherwise the brightness of the headlights will decrease and the lighting distance will become shorter.e, which will easily affect driving safety.
Precautions for maintaining car headlights
When installing the headlights, install them according to the instructions and ensure the correct position to avoid affecting the lighting angle of the light. Keep the headlight surface. own. If applicable. If the optical lens is seriously blurred, it should be treated immediately.
(1) “Vehicle” refers to motor vehicles and non-motorized vehicles.
(2) “Motor vehicle” means a wheeled vehicle driven or towed by a motorized device and driven on the road for the purpose of riding in it or for transporting objects and carrying out transport operations. special engineering.
(3) “Non-motorized vehicles” means vehicles driven by human or animal power and driven on the road, as well as vehicles driven by power units but whose speedmaximum designed, the mass of the vehicle empty and the overall dimensions comply with the regulations in force. Motorized wheelchairs, electric bicycles and other means of transport for people with disabilities.