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What Causes Transmission Abnormal Noise?

1 Answers

McMiranda

07/30/25 7:38am

Transmission gear abnormal noise is usually caused by low or deteriorated transmission oil level, excessive or insufficient gear meshing clearance, or poor gear engagement. When diagnosing the cause of transmission abnormal noise, the pattern of the noise should first be identified, and then possible fault causes and solutions can be further determined based on the situation. Below is relevant information about the transmission: 1. When the transmission meshing clearance is too large, the driving gear impacts the driven gear during rotation, producing a knocking sound. This noise usually worsens as the transmission temperature increases. When the meshing clearance is too small, the abnormal noise is usually continuous, sometimes uniform and sometimes uneven. The faster the vehicle speed, the more severe the noise, and it often causes the transmission lubricating oil to overheat. Gear noise can also be caused by damage to the gear tooth surface. This noise is uneven, rhythmic, and increases with greater throttle input. In severe cases, vibration of the transmission can be felt. 2. If abnormal noise from the transmission area is heard in the cabin during idle or driving, possible causes include: insufficient transmission oil or deteriorated oil quality; worn, loose, or damaged transmission bearings; bent transmission shaft; abnormal gear engagement with excessive or insufficient meshing clearance; metal spalling on gear tooth surfaces, broken teeth, or misalignment during repair or assembly; loose connection between the gearshift lever and the shift fork groove. Corresponding measures: If there is a metal dry friction sound during driving and the transmission housing feels hot to the touch, this is caused by insufficient or deteriorated lubricating oil. Oil should be added or the oil quality checked, and replaced if necessary. 3. If there is abnormal noise in neutral, which disappears when the clutch pedal is depressed, it is usually due to wear or looseness of the front and rear bearings of the transmission input shaft or noise from the constant mesh gear. If noise occurs in all gears, it is mostly due to noise from the rear bearing of the output shaft. Severely loose or damaged bearings should be repaired or replaced.

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