Why is there an abnormal noise in the engine?
3 Answers
Abnormal noise in the engine may be caused by engine oil. Causes of abnormal noise: Abnormal noise in the engine indicates that the technical state of a certain mechanism has changed. It is mainly caused by excessive wear of some parts or improper assembly and adjustment. The transmission has many parts, and the causes of noise are also relatively complex. Solutions: Abnormal noise can also indicate that the engine may suffer accidental damage. Therefore, when abnormal noise occurs in the engine, it should be repaired in time to prevent the fault from expanding. If the abnormal noise is inside the engine, most car owners cannot solve it by themselves, and it is best to send it to a factory for inspection and repair. If the transmission noise is obvious, it is still recommended to send it to a professional repair shop to check the faulty parts and then replace them.
If your engine makes abnormal noises, there are quite a few common causes. You can make a preliminary judgment by listening to the sounds: a high-pitched squealing noise is usually a belt issue, such as a worn or loose timing belt or accessory belt causing friction during operation; a dull noise may indicate a worn water pump or alternator bearing, especially noticeable during acceleration; a metallic tapping sound could mean a loose chain system or failed tensioner; if there's a humming noise, it might be due to insufficient oil, causing excessive friction between internal components due to poor lubrication; ignition system problems like carbon buildup on spark plugs or incorrect timing can also cause knocking sounds resembling crackling collisions. Ignoring these minor issues can lead to major repairs—for example, a broken belt can damage the engine. In cold winter weather, belts harden and are more prone to noise, so checking belt condition and replacing them promptly can save you money and hassle.
As an experienced driver, I believe engine abnormal noise should be taken seriously. That sound isn't normal operation - minor cases require small repairs, major ones can leave you stranded: like belt aging squeals, replacing the belt costs just a few hundred; water pump or generator bearing failure makes a dull sound, replacing parts isn't expensive either; chain looseness causes ticking noises needing tightening; low oil just needs topping up. But serious issues like piston rings or connecting rod problems - those crunching sounds may indicate an overhaul costing tens of thousands. After starting, locate the sound by listening - no noise at idle but present during acceleration usually indicates belt issues; steady rhythmic knocking points to internal components. Don't delay, identify the cause immediately, find a reliable shop for inspection - safety comes first.
