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