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Replacing a timing belt is one of those things that scares most car owners because it is an in-depth job and usually quite expensive when done at a shop. More often than not, it is actually the tensioner that goes bad, not always the belt (unless it is really old). Most of the time a belt will break due to a seized pulley or bad tensioner allowing it to contact the timing cover.

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  1. A bad tensioner will usually be accompanied by noise. This noise could be some type of squealing or rattling coming from the timing cover area. Also, when your timing belt is loose, it will cause some drivability issues usually under high load or high rpm. If your timing belt is not properly tensioned it will not keep the valves timed properly to the lower end and this will cause misfires, loss of power, bucking, and could even cause a no start condition.
  2. If the car runs, then stand on the side of the car where the pulleys are and try to distinguish where the noise is coming from. If you hear the noise coming from the front of the engine and it is not coming from your accessories, you may hear the belt flapping around due to the loss of tension.
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  3. If the car doesn't run and you are going to be the one doing the work, then remove your front accessories enough to get to the front cover. Once done, remove the front cover and check to see how loose the belt is. There should be a little slack on the opposite side of the tensioner, but not much.[1]
  4. It will be very apparent if something is broken.
  5. [2]
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  • Question
    I have had to change my timing belt twice within a year. What could be the cause?
    Community Answer
    Community Answer
    First, check that none of the teeth that the belt is riding on are worn. Worn teeth will dig into the belt and cause premature wear. Then, check each gear's bearing. The belt tensioner bearing is the most likely one to fail first, but it's usually the easiest to check and fix. With the belt off, spin the belt tensioner (which is usually the plain, smooth wheel on a spring loaded arm; the smooth side of the belt rides along it). A bad bearing will not spin as easily and/or will sound rough. Finally, check for rubbing. See if anything is rubbing against the belt, causing it to fail.
  • Question
    How can I know whether the mechanic has been truthful about the timing chain tensioner leaking and it costing $1000?
    Fouad Martin Yousfi
    Fouad Martin Yousfi
    Community Answer
    The timing chain tensioner is a part that requires a lot of work to change. That's caused by the necessary time to reach the tensioner and to synchronize the chain, which is in the engine, not as a belt that is external. Sometimes, to prevent maintenance, your mechanic can change the chain, as if the tensioner was bad, the chain may have some damage too, and a good mechanic would take a profit of the removal to change everything that may need some further costly maintenance or irreversible damage. As far as the mechanic being truthful about it leaking, you could take it to another mechanic for a second opinion and quote.
  • Question
    Do I always have to get the "kit" for replacing the timing belt, or can I just replace the belt?
    Community Answer
    Community Answer
    The kit is only necessary if you do not have the other parts or tools that it includes. If you have these items, you may replace the belt alone.
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About This Article

Charley Helvy
Reviewed by:
Automotive Expert
This article was reviewed by Charley Helvy. Charley Helvy is an Automotive & Diesel Expert based in Avondale, Arizona. He is the founder of Charley’s Garage, an educational YouTube channel focusing on simple videos for automotive and truck enthusiasts. He has over 31 years of experience in the automotive world. He is a Diesel Instructor at the Universal Technical Institute and is a certified ASE Master Heavy Truck Technician. He offers training on gas and diesel engines on his YouTube channel, along with other DIY and explanation videos for beginners and enthusiasts alike. In 2024, he published a complete guide on Emissions Systems in Automotive and Diesel Vehicles. This article has been viewed 495,053 times.
30 votes - 87%
Co-authors: 10
Updated: September 12, 2023
Views: 495,053
Categories: Transmission Parts
Thanks to all authors for creating a page that has been read 495,053 times.

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