What Are the Causes of Abnormal Noise in the Engine Transmission?
2 Answers
Engine transmission abnormal noise is caused by: 1. Wear and damage of bearings; 2. Abnormal gear meshing clearance; 3. Gear tooth surface metal peeling, tooth breakage, or misalignment during assembly; 4. Insufficient lubrication due to lack of lubricating oil; 5. Water ingress into the transmission; 6. Loose bolts on the transmission housing; 7. Loose fit between the gearshift lever and the shift fork groove in manual transmissions; 8. Long-term lack of automatic transmission fluid replacement; 9. Use of inferior automatic transmission fluid. Transmissions are divided into manual transmissions and automatic transmissions. Manual transmissions mainly consist of gears and shafts, while automatic transmissions are composed of a torque converter, planetary gears, a hydraulic torque variation system, and a hydraulic control system.
I'm a veteran driver with decades of experience, and I've encountered quite a few cases of abnormal engine and transmission noises. The most common issue is gear wear or damage inside the transmission, especially in older cars. If you experience rough shifting and hear grinding noises while driving, there's an 80% chance it's the gears. Another possibility is insufficient or dirty transmission fluid - lack of lubrication causes dry friction between components, amplifying the noise. Don't underestimate this; delaying repairs could lead to complete transmission failure, with repair costs running into thousands. I recommend regular fluid checks and changing the oil every two years. Oh, and it might also be engine-related components like loose belts or chains that cause the transmission to rattle too. Bottom line - never ignore unusual sounds, get your car to a professional shop immediately for diagnosis. Safety first.
