Why is there abnormal noise when starting a manual transmission car?
1 Answers
Starting noises can originate from the clutch, clutch release bearing, transmission, differential, or half-shaft. Below are specific reasons: 1. Issues with clutch operation caused by abnormalities in the clutch disc or friction plate. 2. Problems inside the transmission, such as damage or wear to gear shafts, internal bearings, or synchronizers, can cause noise. 3. The vehicle has been involved in a major accident, resulting in displacement of the transmission and engine mounting points. 4. Aging rubber at the transmission mounting points. Below are additional notes on precautions when starting a manual transmission car: 1. The key points for operating the clutch pedal when starting are "quick, slow, and engage": Lift the pedal quickly at the beginning; when the clutch starts to engage (indicated by a change in the engine sound), lift the pedal slightly slower; from engagement to full connection, lift the pedal slowly; while lifting the clutch pedal, gradually press the accelerator pedal according to the engine resistance to ensure a smooth start. 2. Correct operation when shifting gears: When shifting gears while driving, the clutch pedal should be pressed and released quickly, avoiding partial engagement, which would accelerate clutch wear. Additionally, coordination with the accelerator is essential. 3. To ensure smooth gear shifting and reduce wear on the transmission shifting mechanism and clutch, it is best to use the "double-clutch shifting method." Although this method is more complex, it is an effective way to save fuel and reduce vehicle wear. 4. Avoid unnecessary clutch pressing: During normal driving, the clutch is fully engaged and should not slip. Apart from starting, shifting gears, and low-speed braking, avoid pressing the clutch pedal or resting your foot on it. Keeping your foot on the clutch pedal for extended periods while driving can easily lead to clutch slippage, clutch disc burning, and in severe cases, damage to the clutch pressure plate and flywheel, as well as weakening of the clutch pressure springs. It also wastes fuel and increases vehicle wear.
