What are the reasons for abnormal noise when engaging reverse gear in Volkswagen Sagitar?

[DiJayden]

There are several reasons for abnormal noise when engaging reverse gear in Volkswagen Sagitar, including gear noise, bearing noise, or other causes. Gear noise: The noise may be caused by worn and thinned gear teeth with excessive clearance, resulting in impact noise during operation; noise from improper gear meshing; fatigue-induced tooth surface spalling or individual tooth breakage; excessive clearance in spline fit between gear and shaft; shaft bending or loose bearings at both ends of the shaft causing changes in gear meshing clearance, or noise from improper gear meshing due to poorly adjusted axial shims. Bearing noise: The abnormal noise may be caused by worn bearings inside the transmission, or gear oil that is too thin or of poor quality. Abnormal clearance between the inner shaft (outer) circle and shaft neck (hole) may also contribute. Other causes of noise: For example, insufficient oil inside the transmission or gear oil that is too thin and of poor quality. Foreign objects falling into the transmission or loose internal fastening bolts may also cause abnormal noise.