What Causes the Abnormal Noise in Nissan CVT Transmission?
2 Answers
Nissan CVT transmission abnormal noise may be caused by the following reasons: Wear and damage of bearings: When bearings wear out, the gap increases and the fitting accuracy decreases; when bearings are damaged, abnormal noise will occur due to the inability to operate normally, which may even damage the transmission components and expand the fault. This can also be caused by the wear of transmission components or the use of replacement parts with excessively low precision, such as gear wear or excessive fitting gap between new gears and original gears. Insufficient lubrication or excessively high viscosity of lubricating oil leading to poor lubrication: In this case, the corresponding lubricating oil (grease) should be replaced, otherwise it will aggravate the wear of the transmission and shorten its service life. Loosening of bolts on the transmission housing (end cover): Vibration during use may cause the bolts to loosen, so regular inspection is recommended.
A few days ago, my Nissan Teana's CVT transmission also developed a rustling abnormal noise. After researching, I found the common causes include: steel belt wear being the main reason, especially during aggressive acceleration, where friction between the friction plates and pulley can produce noise; unstable valve body oil pressure can also easily cause strange whining sounds, possibly due to clogged oil passages or solenoid valve malfunctions; deteriorated or insufficient transmission fluid worsens the situation, as dirty oil fails to lubricate properly, accelerating part wear; aging differential bearings may also cause abnormal noises during low-speed turns; additionally, transmission computer program errors can disrupt shift logic and generate noises. It's recommended to replace the original NS-3 specialized fluid on time, avoid stomping on the accelerator, and get inspections promptly if issues arise.