car engine timing belt

Though not technically a type of timing belt, timing chains are worth mentioning as they serve the same purpose. Timing chains are made of metal links and tend to last longer than rubber timing belts. They do not require regular replacement like rubber belts, as they are less prone to stretching and wear. However, they can be noisy and heavier, potentially impacting engine performance. Timing chains are typically found in larger engines, where the robustness of a chain is beneficial.


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  • Name
  • How are they used?

  • All rubber or polymers
  • The metal case is the exterior (or frame) of the oil seal, the principal function of which is to give rigidity and strength to the seal. The material of the case must be selected depending on the environment where the seals are to be used. Often the metal case is covered by the same rubber material used in the sealing element, which also helps seal the exterior of the oil seal in the housing bore. Common case material types are: