Q: Why my drive belt keep shredding ?

asked by on

I when to a mechanic to replace the drive belt because my car had a sound like a crying sound , the mechanic replaced the drive belt and two day laters I felt a weird sound and I checked the car and the belt was about to break it was shredded , another mechanic replaced the belt again with a pulley as well and later that day the belt shredded again and it was out of the pulleys , can somebody can give me an idea of what's going on??

My car has 80000 miles.
My car has an automatic transmission.

Usually, by the time a Mercedes drive belt is ready to be replaced, the tensioner is shot too. If you haven’t replaced the tensioner, than you should. If the pulley that was replaced was in fact tensioner, then you need to look at the individual devices. If you have an AC compressor or an alternator that is trying to lock up, the extra load on the belt will make it slip, and eventually burn up. Additionally,if any of the mounts are loose, causing alignment issues, then the belt will not last very long. As a final thought, make sure the routing of the belt is correct. Some of these belts are routed like a Rube Goldberg mousetrap and it’s possible to fit the belt up in several ways, but only one of them is right. If you decide to delegate this work, you can contact Your Mechanic to have a technician come out to your home or office to check out your car and take care of your belt for you.

Was this answer helpful?

A drive belt will typically shred due to one of a few different issues. A component that the belt drive has failed (ie: power steering pump, alternator, a/c compressor, etc.), some kind of foreign material has gotten into the belt and caused damage, or a idler/tensioner has failed and allowed the pulley to either lock up, or will allow the pulley to wobble. When the pulley wobbles (which is usually due to a bearing failure) it will cause the belt to come out of alignment and ride over top of the edges of the pulleys and can cause damage or failure. It is normally necessary to remove the belt and do some diagnosis on each of the driven accessories to identify which one is causing the issue. If this is something that you need a hand with, contact a certified mechanic, like the mobile mechanics available at YourMechanic.com.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Why my drive belt keep shredding ?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: What's the thing call that connects your wheel to the putter tie ride and to the upper and lower ball joints

The part you are referring to is called the spindle. It connects the upper and lower control arms and connecting to the steering tie rod end. The brake caliper attaches to it also.

Q: Can a mechanic crack a rim while changing a tire?

Hi Adeline. Thanks for contacting us tonight. With today's tire changing machines, cracking a rim during removal and installation is incredibly difficult to do - however, it is possible. If the tire is busted off the bead (which is a...

Q: Serpentine belt came off of 2006 BMW 325i

The serpentine belt tensioner and idler pulleys will need to be replaced when replacing the belt. The tensioner will not hold tension on the belt and the pulleys may be worn and allowed the belt to ride off. I recommend...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...