This excessive wear of the timing belt pulley teeth is often due to being used in an abrasive atmosphere. Indications of severely worn timing belt pulleys include:

  • Groove wear
  • Reduction in the outside finish diameter
  • Polished land wear
  • Teeth worn to the point of serious dimensional distortion. The teeth will become “razor” sharp to the touch.

Probable Cause:

  • Timing belt pulley has too little wear resistance

Corrective Action:

  • Change timing belt pulley material

Probable Cause:

  • Misaligned drive

Corrective Action:

  • Check parallel and angular alignment of the timing belt pulleys

Probable Cause:

  • Excessive debris

Corrective Action:

  • Eliminate or control condition
  • Clean and protect drive

Probable Cause:

  • Excessive load

Corrective Action:

  • Check horsepower rating
  • Redesign drive

Probable Cause:

  • Timing belt tension too low or high

Corrective Action:

  • Adjust tension to recommended value

Probable Cause:

  • Incorrect timing belt tooth profile for timing belt pulley

Corrective Action:

  • Check timing belt / timing belt pulley compatibility
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