What Causes the Abnormal Noise from the Transmission Mount?
3 Answers
There are several main reasons for abnormal noise from the transmission mount: Bearing Wear and Damage: When bearings wear out, their clearance increases, leading to a decrease in fitting precision. If bearings are damaged, they cannot operate normally, resulting in abnormal noise and even causing damage to transmission components, which can escalate the fault. Component Wear: This can be due to the wear of transmission components or the use of replacement parts with insufficient precision, such as excessive clearance between worn or newly replaced gears and the original gears. Insufficient Lubrication: Inadequate lubrication or excessively high viscosity of the lubricant can lead to poor lubrication. In such cases, the corresponding lubricant (grease) should be replaced; otherwise, it will accelerate transmission wear and shorten its service life.
Let me talk about the issue of transmission mount noise. I've been driving for over a decade and have encountered this problem several times. The most common cause is rubber aging - over time, the rubber hardens and cracks, producing squeaking and creaking noises when going over bumps, especially during startup or gear shifts. The wear accelerates on rough roads, and dust accumulation can increase friction. From a safety perspective, ignoring these noises can lead to severe mount wear that affects transmission alignment, making the car feel unstable while driving and potentially damaging other components. For prevention, I recommend regular undercarriage inspections, avoiding overloading or aggressive acceleration. During maintenance, cleaning and lubricating the mount might help reduce noise. If you notice abnormal sounds, visit a repair shop early - replacing a new mount only costs around a hundred yuan. Delaying repairs isn't worth it and could cost more in the long run. I just had mine fixed last week, and the car feels much more stable now that the noise is gone.
That transmission mount squeaking issue, I've fixed quite a few similar cases. Basically it's caused by either aged rubber mounts or dried-up lubricant leading to friction noise. New cars have sufficient grease on the mounts, but after prolonged use the grease wears off and the rubber becomes brittle, causing metal components to make contact noises. It's more noticeable during bumps or acceleration. During inspection, use a light to check for cracks or deformation - if the noise temporarily disappears after lubrication, it indicates a dryness problem. Regularly keep the mounts clean to minimize dust accumulation. For persistent noises, it's best to replace with new mounts, ensuring precise alignment during installation to prevent recurrence. For maintenance, I apply specialized lubricant every six months to extend lifespan. Safety first - don't wait until the noise becomes severe enough to affect driving stability, address it early to avoid bigger troubles.
