Serpentine Belt Pulleys?

Tiny
MICHAEL NEEDS HELP
  • MEMBER
  • 1991 CHEVROLET SILVERADO
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
I made a video of the two pulleys in question and wondered if the two pulleys appear to be operating normally and if not, then should I tighten/loosen them?
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Friday, January 27th, 2023 AT 5:33 AM

1 Reply

Tiny
AL514
  • MECHANIC
  • 4,632 POSTS
That pulley is the main tensioner for the serpentine belt, you can put a wrench on the lower pully section and see if it's too easy to move, the spring tension might be getting worn down. It does appear to be moving quite a bit, I would take the belt off and check the rest of the components that are driven by the belt. Make sure everything spins freely. Might be time to replace that tensioner and check the belt for any cracks as well. Make sure to draw out a diagram of the belt routing before removing it, that way you'll know how the new one goes on. Hope this helps.

Here are the different belt routings for your truck:

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

https://www.2carpros.com/articles/replace-serpentine-belt
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Friday, January 27th, 2023 AT 9:02 AM

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