What Are the Common Faults of Manual Transmissions?
2 Answers
Manual transmission is a speed-changing device used to alter the speed and torque transmitted from the engine to the driving wheels. Common faults of manual transmissions are as follows: 1. Transmission noise phenomenon: (1) Transmission noise refers to abnormal sounds emitted during the operation of the transmission. (2) Causes: Gear noise due to excessive wear, thinning of gears, excessive clearance causing impact during operation; poor meshing of gear surfaces, such as not replacing gears in pairs during repairs. 2. Transmission oil leakage phenomenon: (1) The appearance of lubricating oil around the transmission and a decrease in the oil level in the transmission gearbox can be judged as lubricating oil leakage. (2) Causes and solutions: Improper selection of lubricating oil, generating excessive foam, or excessive lubricating oil volume, in which case it is necessary to replace or adjust the lubricating oil. 3. Transmission jumping out of gear: When an electric vehicle is driving in neutral, rapidly pressing the accelerator pedal or the electric vehicle being subjected to impact causes the gear lever to automatically return to neutral, the sliding gear disengages from the meshing position, interrupting power transmission, which is known as gear jumping. This phenomenon often occurs when there is a sudden change in high-speed load or when the electric vehicle vibrates, with high-speed gear jumping being the most common.
I've driven manual transmission cars for over a decade and encountered quite a few common issues. Clutch slippage is the most annoying - the engine revs up but the car lacks power when starting, especially noticeable when climbing hills. Gear shifting difficulties are also common, like not being able to engage gears or getting stuck, usually due to synchronizer wear or debris between gears. Noise problems often come from the release bearing - squeaking or clunking sounds when depressing the clutch; metallic grinding noises while driving might indicate internal gear damage. Oil leaks shouldn't be ignored either - oil stains under the car after parking can lead to stiff shifting due to insufficient fluid. Then there's gear lock-up, when you can't shift to neutral because of linkage mechanism failure. I recommend regularly checking clutch pedal travel and transmission fluid, changing the fluid every 50,000 km. Prevention beats repair - beginners should avoid riding the clutch too much as it accelerates wear. Save yourself the trouble.
