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What causes a belt tensioner to rattle?
When the tensioner or tensioner pulley fails, the loss of tension can cause the belt and pulleys to make high-pitched rattling or chirping noises. If the pulley bearing completely fails, it can also cause a squealing or even a grinding noise. Symptom 2: Knocking or slapping. This can cause a slapping or knocking noise.
What does a loose belt tensioner sound like?
1. Grinding or squeaking noise from the belts or tensioner. The most common symptom of a bad or failing drive belt tensioner is noise from the belts or tensioner. If the tensioner is loose the belts may squeak or squeal, especially when the engine is first started.
Why is my tensioner shaking?
Causes of Belt Tensioner Wobbling In general, belt tensioners tend to get noisy when they fail. If your belt tensioner is chirping or makes other noises, it is often an indication that the part is old and needs to be replaced. You can even remove the belt, spin each pulley, and listen for rumbling or other noises.
How much does it cost to fix a belt tensioner?
The average cost for a drive belt tensioner replacement is between $211 and $239. Labor costs are between $73 and $93, while parts are priced between $138 and $146.
Why does my belt tensioner make a grinding noise?
If the noise you hear is similar to a grinding sound, then it is possible that the tensioner bearings or the tensioner pulley is the problem. These parts tend to wear out. This is what causes the grinding noise since the metal parts will be rubbing against each other. This is another symptom of a failing belt tensioner.
What are the symptoms of a bad belt tensioner?
Squeaking or Grinding Noise. One of the most common symptoms of a failing belt tensioner is unusual noise coming from either the tensioner or the drive belts. If the drive belt noise resembles a squeal or a squeak, it is possible that the belt tensioner is loose. This is especially the case when starting the engine first thing in the morning.
What does the spring on a belt tensioner do?
The spring keeps the drive belt in its correct tension. The tensioner arm is a mechanism that allows for the adjustment or the removal of the drive belt. It delivers enough slack on the drive belt for easier adjustments.
Why does my car make a rattling noise when I start the car?
” If your car engine is making a rattling noise on startup, idle or when accelerating you could have a faulty serpentine belt tensioner , a loose bolt on the mounting bracket, loose timing belt, rusty or broken flexplate, faulty harmonic balancer, loose fan blade, engine knock (pinging) or low levels of engine oil. ” 1. Low Engine Oil 2.