Timing Belt Pulley Unusual Wear

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