Unusual noises signal cars 'demanding money'

The noise and the screeching

If the engine compartment of the car has a screeching sound accompanied by noise when starting the engine, the sound lasts for a long time, think about one or some bearings that have died. Before, the sound may be very small, but then gradually increase. The bearings inside the engine compartment can be ball bearings, belt bearings, air conditioner bearings...

Depending on the type of noise, the cause can be diagnosed more accurately. If the noise is squealing, it may be due to the bearings running out of grease, causing the metal parts to rub against each other. If the noise is loud and consistent, it may be due to broken or chipped bearings or cracks in the bearing grooves.

- Worst consequences:A stuck ball can cause the belt to break or slip. Therefore, as soon as you discover this, you need to take your car in for repair as soon as possible.

The dry rustling sound grew louder.

This cry can appear for a very long time, at firstunclear then gradually increased. Only when the noise was loud and clear was it discovered that the engine was not well lubricated, causing the metal parts to rub against each other in an unlubricated state, causing wear and tear, emitting noise.

The cause could be a clogged oil line, or a long time without changing the lubricating oil, causing the oil to lose its quality and become scum. The louder the noise, the worse the lubrication inside the engine.

- Worst consequences:The engine was completely damaged, from the piston, cylinder, camshaft, connecting rod, piston rings, and many other details.

The screech is even.

This noise is easily recognizable, characteristic of rubber rubbing against a metal surface. If the noise appears when the machine is first started when cold and disappears after a few minutes when the machine warms up, it is due to a loose or hardened belt. But if the squealing noise persists, it is time to replace the belt immediately.

To confirm that the squealing noise is caused by the belt, you can test it by spraying clean water on the belt while the engine is running. If the noise disappears when the belt is wet, it is definitely damaged.

- Worst consequences:The belt broke, disabling many other systems such as air conditioning, power steering, generator, coolant pump...

Wheel hum

Normally when driving at low speed in the city, you will not see any unusual signs. But when driving at high speed on the highway, a humming sound from a wheel can be assumed to be a broken wheel hub; the noise will increase proportionally to the speed of the vehicle.

The cause of hub bearing death is due to long-term use, the lubricating grease inside the bearing dries or gradually disappears. Or because the vehicle often goes into flooded areas, while the bearing seal is loose, allowing water to enter and damage the bearing.

- Worst consequences:When the hub bearing is loose, the excessive noise can cause the wheel to vibrate when operating, affecting braking efficiency.

Squeaking sound in the brakes

But if the noise appears continuously for a long time, it is an abnormal sign; the cause can be different and the vehicle needs to check the brake noise plate, brake pad wear, brake pad fluid, brake disc distortion, stuck cup-pen in brake piston...

• Worst consequences:This is the case where the brake pin is stuck due to the cup stuck in the piston, causing the brake to jam.