Ribbed Belt, Checking: Procedure
-- Turn the engine by the vibration damper/belt pulley using a wrench.
-- Check the ribbed belt for:
- Cracks in the underside (surface cracks, fragmenting, cross-section breaks)
- Layer separation (outer layer, tension cords)
- Wear-through on the underside
- Fraying of tension cords
- Edge wear (material wear, frayed edges, hardened edges, glazed edges, surface cracks)
- Oil and grease traces