Why Timing Belts Have Teeth and How They Work

Timing belts are used in any number of mechanical devices, but you most often think of this type of toothed belt in connection with your car or truck, where it serves to drive the camshaft.

The original timing belts were made of rubber over various sorts of natural textiles. Today, though, they’re more likely to be created from flexible polymer laid over a reinforcing fabric. The newer belts are more durable, but they can still fail.

What happens when a belt fails?

A timing belt problem can happen in a couple of ways – it can develop gradually, or it can occur suddenly and with potentially catastrophic results. As time goes on, the chances of either type of failure will increase exponentially.

You should never ignore timing belt wear, and one of the most common types of wear is a destruction of the teeth. The teeth ensure that the belt doesn’t slip. Timing belt teeth can take a bit of damage, but eventually if they deteriorate too much, there will be slippage. The belt will continue to work, but the timing will be off. When this happens, you should replace the timing belt. It’s not likely that the belt will break, but constant slippage could damage other components in the engine compartment.

If your belt is showing significant wear, or has several teeth missing in succession, don’t delay. Have it replaced.


Next Step

Schedule Timing Belt Replacement

The most popular service booked by readers of this article is Timing Belt Replacement. YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. We currently cover over 2,000 cities and have 100k+ 5-star reviews... LEARN MORE

SEE PRICING & SCHEDULING

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Recent Timing Belt Replacement reviews

Excellent Rating

(1,387)

Rating Summary
1,299
45
9
7
27
1,299
45
9
7
27

Greg

23 years of experience
624 reviews
Greg
23 years of experience
Subaru Legacy H4-2.5L - Timing Belt Replacement - Mesa, Arizona
Greg is AMAZING!!! I had a concern unrelated to my scheduled appointment. Another mechanic told me I needed a service done. Greg not only checked it himself, he called another master mechanic to properly diagnose next steps and saved me $3500 of unneeded work! He was incredibly thorough, patient, communicative and was a pleasure to work with. Highly recommend him for work on your car! Thank you for everything, Greg!
Honda Accord - Timing Belt - Mesa, Arizona
Greg was prompt and kept me updated on his arrival time. He communicated the various checks he completed on the vehicle and what needed repair. The repairs were completed on time and with no problems.

James

31 years of experience
1039 reviews
James
31 years of experience
Lexus GS300 L6-3.0L - Timing Belt - Altamonte Springs, Florida
One of the best most professional mechanics I have worked with so far. Very honest and was able to clear up any issues that previous mechanics weren't able to fix. Thanks James will be requesting your services from now on.
Chrysler PT Cruiser - Timing Belt - Orlando, Florida
James is THE MAN. Thoughtful, funny, and a great mechanic. Will be using him going forward for anything I need!

Luke

18 years of experience
322 reviews
Luke
18 years of experience
Ford Fiesta L4-1.6L - Timing Belt - Austin, Texas
On time and ready to get to work. Explained everything that was going on and best way to resolve the issue. Luke is a perfect example of why I use YourMechanic.com.
Hyundai Accent - Timing Belt Replacement - Austin, Texas
Luke was very friendly, informative, & fast! He took care of my timing belt & oil change, completing the job quicker than expected. After the service he went over all findings with me & explained some maintenance I may need in the near future. Will definitely use him again when I need service.

Michael

28 years of experience
672 reviews
Michael
28 years of experience
Toyota 4Runner V8-4.7L - Timing Belt - Queen Creek, Arizona
Michael was on time. He left my driveway clean after the repairs. He took pride in his work. The 4Runner drove better and the motor sounded better after the repairs.

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Related articles

How Long Does a Serpentine/Drive Belt Last?
In order to operate, your car needs more than just a working engine and transmission. The “accessories” attached to the engine aren’t...
How to Replace a Belt in Your Car
When When your engine is running, it creates power that is used for more than just accelerating. The engine’s power turns a belt on the front of the engine that can power additional systems such as: The air conditioning compressor...
How to Check a Faulty Timing Belt Tensioner
The timing belt (https://www.yourmechanic.com/parts/timing-belt-kit) is a critical part of the automotive engine; if it breaks, it can cause some serious damage. The...

Related questions

changing timing belt on 10 year old car with 52k miles, not required till 102 k but decade old belt= bad?
My suggestion would be to take a close look at the belt for microscopic cracks or signs of deterioration. If anything is noted, I would spend the money and replace it as this is a relatively cheap "insurance policy" against...
Timing chain bad?
You may need to replace the tensioner (https://www.yourmechanic.com/services/drive-belt-tensioner-replacement), timing chain (https://www.yourmechanic.com/services/timing-chain-replacement), and guides for the timing chain itself. Firstly, I would recommend having the oil pressure checked to make sure it is within specifications. The tensioner and guides may be...
I'm thinking of buying a 2007 lexus GS450H, its a hybrid with 101829 miles on it, do i have to worry about the batteries? and if s
Hello. First off, your vehicle is equipped with a timing belt. This should be changed soon if it has not already. As for the battery, I typically see these last until about 120,000-150,000 miles. If you need quotes for these,...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (844) 997-3624 · hi@yourmechanic.com