pulley Archives - UnderhoodService
Replacing a Decoupler Pulley (VIDEO)

Millions of vehicles have decoupler pulleys, heres how to replace them. This video is sponsored by Litens.

Belt Alignment Measurement

The first point of inspection is the belt. Listen for the most common noise: a chirping noise.

VIDEO: What Is The Difference Between An OAP And An OAD?

Andrew Markel discusses vibration control alternator pulleys, and the differences between the two most common designs available on the market. Sponsored by Litens.

VW Beetle, Golf And Jetta: Broken Tensioner, Root Cause Of Failure Is Alternator Pulley

This type of failure is the result of severe vibrations in the accessory belt drive system. While a broken tensioner may be the result, the root cause often lies elsewhere in the system.

Belt Wear Diagnostics

The original equipment belts on late-model vehicles are made of synthetic materials and are far more heat-resistant and wear-resistant than older materials. These innovations mean serpentine belts may last up to 100,000 miles before they need to be replaced. If a belt fails sooner, you need to be a detective and investigate why it failed.

Cracked serpentine belt