What Causes the Scraping Sound When the Car is Running?
3 Answers
There are many possible reasons for noise during car driving: it could be due to engine oil issues, such as inferior quality oil, prolonged lack of oil changes, or insufficient oil levels. These conditions can easily increase friction between the valves and guides, as well as in hydraulic lifters, making various sounds within the engine more pronounced. Relevant information about engine oil is as follows: 1. Introduction: Engine oil, also known as engine lubricant (English name: Engine-oil), with a density of approximately 0.91×10³ (kg/m³), serves to lubricate and reduce wear, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption. It is hailed as the 'blood' of the car. 2. Composition: Engine oil consists of base oil and additives. The base oil is the main component of lubricating oil, determining its basic properties, while additives compensate for and improve the shortcomings of the base oil's performance, endowing it with certain new characteristics, making them an important part of lubricating oil.
I've been repairing cars for many years and have seen many car owners complain about a scraping sound when the car is moving, which is often a problem near the wheels. The most common issue is worn-out brake pads, where only a thin piece is left rubbing against the brake disc, producing a continuous scraping sound. Alternatively, it could be a faulty wheel bearing that isn't spinning smoothly, creating a creaking friction noise. Sometimes, small stones or debris stuck in the tire tread can cause a scraping sound as the tire rolls. Another possibility is loose suspension components in the chassis, which rub against each other when the car moves, producing such noises. I recommend getting it checked early and not delaying, as ignoring it could lead to major failures like brake failure or wheel detachment, which are costly and time-consuming to repair. Regular car maintenance can help reduce these issues.
My old car used to make a grinding noise before, and I was really worried about potential accidents while driving my kids to school. Later, I took it to the 4S shop for inspection, and the mechanic said the noise was caused by severe wear on the rear wheel bearings. After the repair, the noise disappeared. It could also be due to worn brake pads or foreign objects stuck in the tires. Anyway, I advise you not to ignore it—unusual car noises often indicate hidden hazards, and timely maintenance is crucial for safety. Remember to check the tires every time you wash the car to prevent minor issues.
