When a main bearing fails, several symptoms can occur:engine noise、loss of oil pressure、increased engine vibration、engine overheating、engine performance issues.

Knocking or rattling sound,Grinding or whining sound,Ticking or clicking sound,Squealing sound.

Some common reasons for main bearing damage: lack of lubrication, overload, improper installation, manufacturing defects, age and wear.

Many times, replacing the main bearing of the engine requires the removal of the crankshaft. This is because the main bearings are located in the engine body and are used to support the crankshaft. To replace the bearing, the crankshaft must be removed from the engine body. However, in some cases, some specialized tools and techniques can be used to replace the main bearing without removing the crankshaft. But the use of tools to remove more difficult, higher requirements, it is best not to easily try.

It is recommended not to drive a car with bad main bearings. The main bearing is the key component of the engine, supporting the crankshaft and making it rotate smoothly. Once the main bearing is damaged or worn, it may cause the crankshaft to be misplaced, resulting in increased friction, heat, and wear on other engine components. Continued operation with poor main bearings may cause further damage to the engine and may lead to engine failure.