What Causes the Fifth Gear Noise in a Manual Transmission?
1 Answers
Manual transmission fifth gear noise may be caused by worn or damaged bearings, low precision, poor lubrication, or loose bolts. Worn or damaged bearings: When bearings wear out, their clearance increases, leading to reduced fitting precision. If bearings are damaged, they cannot operate normally, resulting in abnormal noises and even damage to transmission components, which may escalate the issue. Low precision: This can be caused by worn transmission components or the use of replacement parts with insufficient precision, such as excessive clearance between worn gears or newly replaced gears and the original gears. Poor lubrication: Insufficient or overly viscous lubricant can lead to poor lubrication. In such cases, the corresponding lubricant should be replaced; otherwise, it will accelerate transmission wear and shorten its service life. Loose bolts: Bolts on the transmission housing (end cover) may become loose. Vibration during operation can loosen the bolts, so regular inspections are recommended.