What is the reason for the abnormal noise after replacing the tensioner belt?
2 Answers
The reasons for the abnormal noise after replacing the tensioner belt are as follows: 1. Tensioner failure: The tensioner functions on the engine's timing belt or timing chain, guiding and tensioning it to maintain optimal tension. 2. Generally divided into hydraulic and mechanical methods: Both can automatically adjust the tension of the timing belt and timing chain. 3. Loose timing chain: However, a loose chain is not necessarily a chain issue. 4. Chain: The chain has a hydraulic tensioner that keeps it tight. For this situation, the causes could be insufficient oil pressure or a faulty tensioner.
As someone who frequently works on car repairs, I've encountered many car owners who still hear abnormal noises after replacing the tensioner belt, mainly due to improper installation and unaddressed details. The key issue is incorrect belt tension adjustment—too tight increases friction and causes squealing; too loose leads to slippage and a fluttering sound. During installation, failing to check if the tensioner pulley itself is damaged means old bearing wear can still cause squeaking even with a new belt. The alignment of the guide pulley must also be precise, as misalignment can amplify vibration noise. Don’t overlook other related components, like the alternator pulley or aging water pump bearings, which can continue to generate noise. I recommend using a tension gauge for readjustment or performing a full cleaning and maintenance of the belt system. In such cases, it’s best not to force driving—have a professional shop recheck to prevent minor issues from escalating into safety hazards.
