Which statement is NOT a typical sign of anti-friction bearing failure?

Which statement is NOT a typical sign of anti-friction bearing failure?

• A. Decreased vibration
• B. Excessive play
• C. Noise
• D. Increased temperature

Answer: (C)

When an anti-friction bearing starts to fail, you’ll usually see changes in vibration, clearance, heat, and noise as wear and lubrication degrade the smooth turning of the elements. As wear advances, surfaces become rougher and clearances grow, which tends to increase friction and produce more motion energy that shows up as higher vibration, more audible noise, and more heat. You may also notice the bearing housing feel looser or have more play due to the worn clearance. A decrease in vibration, however, is not a typical sign of bearing failure; it would typically point to a different condition or simply a nonproblematic state. So, the statement that does not fit the pattern of failure signs is the one describing decreased vibration, while the other signs—noise, excessive play, and increased temperature—are consistent with failing anti-friction bearings.

When an anti-friction bearing starts to fail, you’ll usually see changes in vibration, clearance, heat, and noise as wear and lubrication degrade the smooth turning of the elements. As wear advances, surfaces become rougher and clearances grow, which tends to increase friction and produce more motion energy that shows up as higher vibration, more audible noise, and more heat. You may also notice the bearing housing feel looser or have more play due to the worn clearance. A decrease in vibration, however, is not a typical sign of bearing failure; it would typically point to a different condition or simply a nonproblematic state. So, the statement that does not fit the pattern of failure signs is the one describing decreased vibration, while the other signs—noise, excessive play, and increased temperature—are consistent with failing anti-friction bearings.