Description - Defect

1. Hardened back surface of the timing belt. The surface looks glossy.

The surface is hard enough that a fingernail leaves no mark on the belt.

2. Cracks on the back surface of the timing belt

3. Cracks or delamination of the timing belt

4. Severe tooth wear
The tooth face is worn, exposing fibers, cord, and rubber base.

5. Severe tooth wear (final stage)
The tooth face is worn, showing abrasion marks and reduced tooth thickness.

6. Cracks at the tooth base

7. Missing tooth

8. Severe wear on one side of the belt

9. Cracks on the side of the timing belt