Serpentine Belt Pulleys?

1991 CHEVROLET SILVERADO
170,000 MILES • 4.3L • 6 CYL • 2WD • AUTOMATIC
Avatar
MICHAEL NEEDS HELP
  • MEMBER
  • 23 POSTS
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?
Video (Click to enlarge)
Attached Media
Jan 26, 2023 at 9:33 PM
Advertisement
Avatar
AL514
  • ✓Experienced Mechanic
  • 5,610 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
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Jan 27, 2023 at 1:02 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.