What noise does a faulty tensioner make?
2 Answers
Tensioner failure typically produces a buzzing or squeaking abnormal noise. Symptoms of a damaged tensioner include increased fuel consumption, lack of power, engine knocking, and other malfunctions. The tensioner functions on the engine's timing belt or timing chain, providing guidance and tension to maintain proper tightness. Relevant information about tensioners is as follows: 1. Classification of tensioners: Tensioners are generally divided into hydraulic and mechanical types, both capable of automatically adjusting the tension of timing belts and chains. 2. Tensioner removal method: Drive the vehicle onto a lift, disconnect the battery, remove the hose bracket, insert the tool into the special opening of the belt tensioner, then use a wrench to turn the automatic belt tensioner clockwise and loosen the engine auxiliary system belt. Finally, loosen the fixing screws according to the belt tensioner to be removed.
As a veteran driver with over 30 years of experience, I once had a failed tensioner that left a lasting impression—the noise was unforgettable. It sounded like someone was constantly tapping a small hammer inside the engine, a rhythmic clattering that matched the vehicle's speed and became especially loud at idle. It turned out my timing chain tensioner had worn out, causing the chain to loosen and collide with metal components—utterly maddening. I delayed repairs for a week, and the noise only grew worse until the chain skipped teeth, nearly destroying the engine. The fix cost me over 2,000 yuan. So, my advice to new drivers: if you hear persistent abnormal noises, especially during ignition or acceleration, stop driving immediately and get it checked by a professional. Regular maintenance is key—inspect the condition of chains and belt tensioners, replacing them promptly to avoid accidents. The sound varies by car model, but it typically resembles mechanical hammering or metal scraping, indicating a failed internal spring or piston in the tensioner. Ignoring it will only make things worse.
