Q: 2007 bmw 335i serpentine belt keeps breaking

asked by on

I have replaced the belt twice now, it keeps breaking apart. First time it passed through the crankshaft seal and into the timing chain. This time it looks like I got lucky and it didnt. I dont know why it keeps breaking.

My car has 130000 miles.
My car has a manual transmission.

Hi There, It sounds like you may have a tensioner pulley that may have a worn out bearing that may be putting additional stress on the belt as it turns. The other possibility may be that the tensioner pulley may be adjusted too tight. I would suggest having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

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. 2007 bmw 335i serpentine belt keeps breaking

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: replacement of catalytic converter

I wouldn't assume that the rear converter is bad unless the mechanic actually performed a diagnostic on the converter AND then explained to you what was done, what was found and WHY the solution is to replace the converter. If...

Q: Steptronic shifter stopped working

It seems that the switch in your shifter assembly that tells the computer you want to shift a gear manually has failed. The switches for the paddles on your steering column are still good. So they are functional. This is...

Q: Heater won't work from center vents

Hello and thank you for contacting YourMechanic. The issue is the blend doors are not adjusting correctly when you adjust the thermostatic switch. Check the wiring in the dash for any loose contacts to the blend doors. Also check the...

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 Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...