What is the reason for the grinding noise when starting and shifting gears in FAW J6P?
2 Answers
Due to the design factors of the vehicle itself. Here are the relevant explanations: 1. Synchronizer: The smoothness of gear shifting in a car is largely affected by the clutch and synchronizer. However, some car models do not use synchronizers for first gear and reverse gear, which causes the rotational speed difference between the engine power output shaft and the transmission power output shaft during gear shifting, resulting in abnormal noise. 2. Severe clutch wear: A reduced free travel of the clutch pedal may also cause abnormal noise. During operation, the clutch cannot completely disconnect the power connection between the engine and the transmission, leading to a significant speed difference during gear shifting. This makes it difficult for the two gears to mesh properly, resulting in a grinding noise during gear shifting.
I've been driving trucks for over a decade and encountered the gear grinding issue during startup with the FAW J6P several times, mostly due to unskilled operation. If the clutch isn't fully depressed and you engage the gear before the gears are properly synchronized, it makes an unpleasant crunching sound. Prolonged practice like this accelerates synchronizer wear and can easily damage the transmission, leading to costly repairs. Once, I made this mistake while rushing a delivery and ended up spending over a thousand yuan on replacement parts. I recommend developing a habit of smooth starts—don't rush to shift gears; first, ensure the clutch is fully disengaged. Also, check the clutch fluid; low or dirty fluid can affect disengagement. For routine maintenance, have a mechanic adjust the clutch pedal travel regularly, typically every 5,000 km. These small practices can prevent major troubles and significantly extend the vehicle's lifespan.
