What Causes Abnormal Noise When Shifting Gears?

[DeVera]

The causes of abnormal noise during gear shifting include operational issues, excessive impurities in the lubricating oil, and synchronizer problems. Below are the solutions for abnormal noise when shifting gears: Operational issues: If the clutch is not fully disengaged before shifting, it can cause gear noise and even gear grinding. The solution is to fully depress the clutch pedal and shift correctly. Excessive impurities in lubricating oil: If the lubricating oil in the transmission contains large impurities, such as iron filings from long-term wear, these can get caught between the gears during rotation, leading to gear grinding. The solution is to replace the lubricating oil with a higher-quality product. Synchronizer problems: Inside a manual transmission, there is a crucial component called the synchronizer. Its role is to match the speed of the output gear with the gear being engaged during shifting. Without a synchronizer, forcing a slow-moving gear into a fast-moving one will inevitably cause gear grinding. In this case, it is necessary to visit a 4S shop for professional inspection and repair.