What sound does a faulty Audi tensioner pulley make?
3 Answers
A faulty Audi tensioner pulley typically produces a humming or squeaking noise, with the pitch becoming sharper as engine RPM increases. It is recommended to replace it promptly. Function and structure of tensioner pulley: The tensioner pulley is a belt tensioning device used in automotive transmission systems. Its purpose is to adjust the tightness of the timing belt, automatically regulating tension to ensure stable, safe, and reliable operation of the transmission system. It mainly consists of a fixed housing, tensioning arm, pulley body, torsion spring, rolling bearing, and spring bushing. Methods to identify a faulty tensioner pulley: Remove the timing belt cover, take out the timing belt and all timing belt tensioner pulley bearings. Rotate the bearings by hand and carefully check for any abnormal noise or sticking in the bearings.
The noise from the Audi tensioner sounds like a high-pitched squeal or continuous rattling, especially noticeable when starting or accelerating the car. Having worked on many Audis, I've found this sound often stems from worn tensioner bearings or belt slippage—it's harsh and unpleasant. I strongly advise not to delay addressing it, as it could lead to belt breakage or engine stalling, compromising driving safety. Diagnosis isn't overly complex: pop the hood to pinpoint the noise location or gently rotate the tensioner with a tool to check for looseness. Repair or replacement typically costs a few hundred yuan—don't wait until the car breaks down to act.
When driving my Audi, I've heard a grinding or buzzing noise similar to teeth chattering, which is caused by the tensioner pulley. With years of driving experience, I've noticed this sound is loudest during cold starts and then quiets down slightly, but don't take it lightly. It's mostly due to a seized bearing or lack of lubrication. Continuing to drive may accelerate belt wear. My advice is to have it checked by a reliable mechanic as soon as possible—replacing the faulty part will solve the issue.
