ASE G1 Auto Maintenance and Light RepairMaintenance and Light RepairMedium
A technician is inspecting a vehicle's serpentine belt. Which of the following conditions indicates the belt should be replaced?
- AMinor surface cracks on the smooth side.
- BA light dusting of dirt on the belt surface.
- CFraying or material loss along the edges.
- DSlight glazing on the ribbed side.
Show answer & explanationAnswer & explanation
Correct answer: C. Fraying or material loss along the edges.
Fraying or material loss along the edges of a serpentine belt indicates significant wear and potential for failure. This condition compromises the belt's structural integrity and ability to properly drive accessories, necessitating replacement.
Why the other options are wrong
- A. Minor surface cracks on the smooth (back) side of the belt are often cosmetic and do not necessarily indicate immediate failure, especially if the ribbed side is intact. However, deep or numerous cracks would be a concern.
- B. A light dusting of dirt is normal and does not affect belt performance or indicate a need for replacement.
- D. Slight glazing can occur over time and might not immediately warrant replacement, though it should be monitored.
Serpentine Belt Inspection
Visual and tactile examination of a serpentine belt for signs of wear, damage, and proper tension to ensure reliable operation of engine accessories.
- Cracks, fraying, missing ribs, or glazing are signs of wear.
- Proper tension is crucial for preventing slippage and component damage.
- A worn belt can lead to loss of power steering, alternator, or A/C.
Memory trick: Look for the edges fraying or ribs disappearing, that's when it's time to change.