What Are the Causes of Abnormal Noise in a Manual Transmission?
1 Answers
Manual transmission may produce abnormal noise due to excessive or insufficient gear meshing clearance, poor gear meshing, low or deteriorated transmission oil level. Below is a detailed introduction to the causes of abnormal noise in manual transmissions: 1. Excessive or insufficient gear meshing clearance: When the 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 typically continuous, and the faster the vehicle speed, the more severe the noise becomes, often causing the transmission lubricant to overheat. 2. Poor gear meshing: The abnormal noise from the transmission may be caused by the collision of gear tooth surfaces. This noise is uneven, and the greater the throttle, the louder the noise becomes. In severe cases, vibrations in the transmission can be felt.