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Serpentine belt keeps coming off

Tiny
AGLHOLLYWOOD
  • MEMBER
  • 2007 NISSAN PATHFINDER
  • 150,000 MILES
First time it came off I inspected the belt and it appeared fine. The idler pulley has a slot it fits in when you tighten it l, so I know it's not loose. Is it possible the belt is stretched out and needs replaced? Or what else could be causing this?
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Thursday, February 7th, 2019 AT 4:52 AM

1 Reply

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

What happens with serpentine belt tensioners is over time they get bent or the spring inside of them gets weak. This allows the serpentine belt to come off due to misalignment. Here are a couple of helpful links:

https://www.2carpros.com/articles/how-a-serpentine-belt-tensioner-works
https://www.2carpros.com/articles/serpentine-belt-tensioner-replacement

I have included step by step instructions for your vehicle in the diagrams below. Installation is the reverse of removal.

Thanks,
Alex
2CarPros
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Thursday, February 7th, 2019 AT 9:57 AM

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