Timing Belt and Water Pump
A timing belt is typically rubber with high-tensile fibres (e.g. fiberglass or Twaron / Kevlar) running the length of the belt as tension members.
Rubber degrades with higher temperatures, and with contact with motor oil. Thus the life expectancy of a timing belt is lowered in hot or leaky engines. The life of the reinforcing cords is also greatly affected by water and antifreeze.
Timing Belt and Water Pump Service -