Belt Tensioner Pulley DIY Guide – Step-by-Step Replacement
If you’re hearing squealing, grinding, or rattling noises from your engine bay, your belt tensioner pulley may be worn or failing. This DIY guide will show you how to inspect, remove, and replace a bad tensioner pulley safely and efficiently. Whether you’re maintaining your serpentine belt system or fixing a slipping drive belt, this guide includes the tools, torque specs, and pro tips you need to get the job done right. Save money on repairs and keep your engine running smoothly with AAA Million’s expert automotive resources.
DIY: How to replace a belt tensioner & idler pulley
Tools needed: socket set, breaker bar or serpentine belt tool, torque wrench, jack stands (if needed), penetrating oil, replacement tensioner/idler kit.
1
Safety: park on level ground, engine cool, disconnect negative battery terminal.
2
Note belt routing or take a photo.
3
Use a breaker bar or belt tool to relieve tension on the tensioner and remove the belt.
4
Remove mounting bolts on the tensioner and/or idler pulley. Inspect accessory pulleys and crank pulley.
5
Install new tensioner/idler, torque bolts to manufacturer specs, re-route belt, and release tensioner to seat the belt.
6
Start engine and observe belt run and listen for noises. Re-torque bolts after test drive if recommended.