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: Exhaust leak unknown location near headers, p0170 code fuel trim malfunction bank 1 and white smoke when sitting in traffic.

Hi Kaden. Thanks for contacting us tonight. Usually when an exhaust leak occurs, it will cause the O2 sensors to relay faulty data to the ECU, which triggers the OBD-II code and will impact fuel trim, air mixture and several...

Q: 2008 mbenz 300 4matic blower motor cover slides up and down repeatedly for 15min or more after shutting engine off and removing ke

Hi Vicki. Thanks for contacting us today. I think this is an example where a Mercedes-Benz specialist is better served to recommend the right repair, as this should be inspected personally by the mechanic to recommend the right repair. I...

Q: 1999 Pontiac Grand AM runs rough and smells weird

Hello. An engine running rough at idle could be a vacuum leak creating the wrong fuel ratio for the engine to operate correctly. The smell is probably unburned fuel caused by the vacuum leak issue. The belt shredding could be...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...