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When to Replace Your Belt Tensioner You should expect to replace your belt tensioner in the 40,000-70,000 mile range. It is also customary to swap more than one part simultaneously, usually a worn-out pulley from other systems and even the serpentine belt itself.
How do I know if my serpentine belt tensioner is bad?
The symptoms of a loose serpentine belt include a loud squealing noise when the engine is started or when the steering is turned all the way to one side. A serpentine belt that keeps slipping off the pulley is another symptom of a bad tensioner.
Do serpentine belt tensioners go bad?
One of 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. A bad pulley can cause fraying on the edges of the belt, and in severe cases can even cause it to break.
Should I replace belt tensioner with belt?
Changing out the tensioner pulley would not be a bad idea, especially while you’re in there changing out the belt. However, it’s not mandatory. Any of the pulleys up front are good until they aren’t, but you can check it to see how it is fairing. With the belt off, turn the tensioner pulley by hand.
How long does a tensioner pulley last?
Most modern cars that roll off the dealer’s lot as a new vehicle will have a 60,000 to 100,000-mile life expectancy for the serpentine belt, tensioners, and idler pulleys.
What happens if belt tensioner fails?
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.
Can a bad belt tensioner cause rough idle?
No, not really. Generally a bad timing belt will cause a no idle condition. As in the engine will not run at all. A bad timing belt tensioner might allow a cam to jump a cog and be out of time, but you only get to jump so many cogs before very bad things happen.
What are the symptoms of a bad idler pulley?
Signs and Symptoms of a Bad Idler Pulley Chattering, Squealing, or Chirping Sound. Corroded Surface. Excessively Loose Idler Pulley. A Bad Idler Pulley May Spin Excessively. Slow to No Spin or Binding.
Should you replace tensioner?
There is no recommended timeframe in which to replace your tensioner, especially as the belt itself usually needs replacing before the tensioner does. However, you should inspect your tensioner each time you service your car to monitor its condition and replace it if necessary.
Should I replace the tensioner or just the pulley?
If the pulley is damaged, replace the tensioner assembly not just the pulley. If an idler pulley is damaged, inspect the tensioner also because vibrations caused by a bad idler pulley may damage the tensioner. Check the movement of the tensioner arm with the engine off.
Should I replace idler pulley and tensioner?
If there is any wobble, squeak, or undue friction, the idler pulley should be replaced. The best way to maximize the idler pulley’s lifespan is to maintain proper tension on the serpentine belt and replace belts with new ones whenever required.
What is the life expectancy of a serpentine belt?
Serpentine belts are built to last—much longer than before because of advancements in rubber technology. Under ideal conditions, a belt should stick with you for an average of 60,000 to 100,000 miles.
How important is a belt tensioner?
A tensioner maintains the correct amount of tension on the belt at all times throughout its duty cycle. It also helps protect other components such as the alternator and water pump from undue stress and premature failure. In addition, a tensioner is a relatively inexpensive part to replace.
How much does a belt tensioner cost?
The average cost for drive belt tensioner replacement is between $236 and $268. Labor costs are estimated between $80 and $101 while parts are priced between $156 and $167.
What causes a tensioner to fail?
Excessive arm movement or bounce due to a worn damper: The damper moderates the action of the tensioner spring in much the same way that a shock absorber dampens a vehicle’s suspension. As the damper wears, the tensioner arm can bounce away from the belt, causing excessive belt slippage.
Why is my belt 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.
Can a bad belt tensioner cause misfire?
The belt may oscillate between too little tension and too much tension. The belt will slip and catch, causing noise and vibration. This can cause a change in crankshaft speed that can be severe enough to cause the engine management system to think that a misfire just occurred.
What happens if you don’t replace tensioner?
When the timing belt tensioner fails, the timing belt becomes too loose. It may lose enough tension to stop turning the camshaft, or it may slip off. In either case, the camshaft stops turning (or doesn’t turn as much as it should). In an interference engine, this is very bad news.
Can you over tighten a belt tensioner?
A belt shouldn’t be over-tightened. Any bearing that the belt rotates on can be burned out by an over-tightened belt.
