What are the causes of abnormal noise in the transmission?
2 Answers
The causes of abnormal noise in the transmission are: 1. Wear and damage of bearings; 2. Abnormal gear meshing clearance; 3. Loose bolts on the transmission housing; 4. Metal peeling on gear tooth surfaces, broken gear teeth, or misalignment during assembly; 5. Water ingress into the transmission without timely repair; 6. Insufficient lubrication due to inadequate lubricant; 7. Long-term failure to replace transmission oil. Automatic transmission oil is generally replaced every 2 years or 40,000 to 60,000 kilometers, while manual transmissions require maintenance every 2 years or 40,000 to 60,000 kilometers. Transmission oil is a lubricant that keeps the gear system clean, ensuring the normal operation of the transmission and extending the service life of the transmission components.
Transmission noise is indeed quite annoying. Having run an auto repair shop for many years, I've encountered numerous car owners complaining about it. The root causes may include aging or insufficient internal lubricant, causing excessive friction between gears and bearings that produces noise; or worn synchronizers that make a clunking sound when shifting gears. Additionally, if the clutch or input shaft is loose, it's especially noticeable in automatic transmission vehicles. I can usually make a fairly accurate guess just by listening to the sound: a high-frequency whine likely indicates bearing issues, while a low grinding noise often means insufficient lubrication. The key is early detection and prompt action - otherwise minor issues can escalate into major repairs that cost twice as much. Regular oil level checks and timely oil changes are good preventive measures. Don't wait until problems arise to visit the repair shop.
