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: The cooling mood on my 2007 chevy cobalt came on out of nowhere. I had a guy pour antifreeze in and it was okay until yesterday.

Hi there. Check the coolant level to see if there is any coolant in the radiator. If there is no coolant in the radiator, then fill up the radiator with water and perform a pressure test. Check to see where...

Q: Car hiccups or slight jerks at steady rpm

Ignition failures are more common on your car than fuel injector failures, and the mileage would be about right for coil failures. It takes several subsequent misfires for you to be able to notice it on the road, so if...

Q: 2007 bmw 335i code for ignition control module. Trying to figure out which part to get to replace

The code related to the ignition module suggests that either the ignition module itself is bad or the connections to it are not good resulting in erratic ignition timing and potentially misfires. In some cases, depending on how the ignition...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.