What is the reason for abnormal noise in car alternator?

There are 6 reasons why car generators make abnormal noises: 1. Loose fasteners: Vibrations occur during engine operation, causing some parts to become loose and producing impact noises. For example, loosening the flywheel mounting bolts and loosening the connecting rod bolts may cause abnormal noise. 2. Deformation and damage of individual parts: Abnormal noise is caused by deformation or damage of a certain part. For example, bending of the connecting rod causes the knocking valve spring to break and the crankshaft to break, causing abnormal noise. 3. Improper assembly adjustment or repair: Improper assembly adjustment or repair results in inaccurate assembly clearance of machine parts. Abnormal noise may be caused by improper valve clearance adjustment if the piston pin is too tight. 4. The gap dThe assembly is too large: The assembly gap is an important indicator of the quality of automobile assembly. When the lubrication, temperature, load and speed are constant, the abnormal noise will become more obvious as the mounting gap increases. 5. Poor lubrication: Lubrication is an important condition for normal engine operation. Lubrication, cooling, cleaning, sealing and rust prevention can be achieved through the lubrication system. When the adjustment clearance, temperature, load and speed are constant. The thickness of the lubricating oil film is affected by the pressure of the lubrication system and the lubricating oil. Quality affects the lubricating oil with good quality and appropriate pressure to produce a better lubricating oil film. The thicker the lubricating oil film, the lower the mechanical impact. and the less likely it isit produces an abnormal noise. If the lubricating oil film is too thin and the wear increases, the abnormal sound will be obvious and clear. 6. Abnormal combustion: The ignition time of the gasoline engine is too early or too late, causing deflagration.