What is the reason for the belt slipping sound when accelerating?

[GabrielFitz]

The reason for the belt slipping sound when accelerating is: severe belt wear. When the car's belt is severely worn, the contact area between the belt and the pulley will be significantly reduced. As long as the belt is pressed hard, the belt will sink deeply into the groove of the pulley. When the belt rotates, it becomes very difficult and produces a slipping noise. Generally, there are three main reasons for belt noise: 1. Aging of the drive belt: The drive belt is mainly made of rubber, and rubber will age after prolonged use, becoming harder and more brittle. The friction coefficient will also decrease, which will affect power transmission, leading to slipping and noise. 2. Insufficient belt tension: When the belt tension is insufficient, the belt is prone to slipping just like when it is aged. Belts are automatically adjusted for tightness through a large spring design that presses the belt, thereby regulating the belt's tightness. When the belt is too loose, the friction will also decrease, causing noise due to slipping. 3. Severe belt wear: When the car's belt is severely worn, the contact area between the belt and the pulley will be significantly reduced. As long as the belt is pressed hard, the belt will sink deeply into the groove of the pulley. When the belt rotates, it becomes very difficult and produces noise.

[VanVanessa]

I've been driving for years, and my old car used to squeak when accelerating, which was the sound of the belt slipping. The issue usually lies with the accessory belt in the engine compartment being loose or worn out. When you step on the gas and the RPM increases, the belt's load increases, making it prone to slipping and creating noise. Causes include belt elongation leading to insufficient tension, the surface becoming smooth and slippery, the tensioner pulley getting stuck, or oil leaks contaminating the belt. This is common with belts like the alternator belt or the air conditioning compressor belt. It's recommended to open the engine hood and check for cracks or deformations in the belt. Don't delay; ignoring it could lead to belt breakage, causing the car to overheat and break down. Checking the belt condition every two years during maintenance is the most reliable approach.

[McJulian]

I'm quite used to doing my own car repairs. The belt squealing is most noticeable during acceleration, mostly caused by a loose or worn-out belt slipping. You can DIY the inspection: first, turn off the engine and open the hood, press the middle of the belt with your hand—it should have about half an inch of give. If it's too loose, grab a wrench to adjust the tension screw. Check for any cracks or grease on the belt. Replacing it with a new one isn’t hard, and buying the right model won’t cost more than a few bucks. Avoid using lubricant sprays—they’ll only make things worse. Stay safe by wearing gloves to prevent burns. While driving, minimize sudden aggressive acceleration to protect the belt and extend its lifespan.

[VonIris]

I've heard this sound while driving in the rain, it makes a harsh screeching noise when accelerating. The main causes are insufficient belt tension or surface slippage. When the belt is loose, it squeals due to friction during acceleration. This commonly occurs with aged alternator or water pump belts. The danger lies in ignoring it, as the belt can break, leading to power steering failure or engine overheating. Immediately reduce speed and pull over to inspect. Just find a repair shop to diagnose and replace it. For vehicles over 5 years old, regular belt replacement is essential.

[ElenaRose]

As a seasoned driver, I know well that belt slippage during acceleration is mostly caused by excessive wear or looseness of the belt. A faulty tensioner pulley can also be the culprit. Don't delay repairs; I recommend preventive maintenance checks every 60,000 km. When replacing the belt, clean any oil contamination on the pulleys. Good habits include minimizing heavy AC use and rapid acceleration. Address issues early to avoid secondary damage to components like the water pump and alternator. Remember, safe driving relies on meticulous maintenance.

[VonGrace]

When driving long distances in high humidity, I hear a squeaking sound from the belt when accelerating. This is a classic sign of insufficient tension in the accessory belt causing it to slip. Possible causes include oil contamination of the belt or rusted pulleys. Check the belt for wear indicators. The solution is simple: after stopping, test the tension and tighten the screws; if that doesn't work, replace the belt. Preventive measures include keeping the engine compartment dry and clean. Regular maintenance can extend the belt's lifespan by several years.