What should be used to clean an old bearing?

• A. Solvent
• B. Alcohol
• C. Kerosine
• D. A light oil

Answer: (A)

When cleaning an old bearing, the goal is to remove built-up lubricant and grime so the bearing can be properly re-lubricated and function smoothly. A solvent is best for this because it dissolves grease and oil residues effectively, lifting contaminants off the metal surface. It also tends to evaporate quickly, leaving the bearing dry and ready for inspection and re-lubrication.

Alcohol can handle light residues but may evaporate too fast and struggle with heavier grease. Kerosene is a capable degreaser but can be slower and may leave oily residues that aren’t ideal for reassembly. A light oil isn’t a cleaner at all; it would leave a film that traps dirt and doesn’t remove the old grease.

After cleaning, make sure the bearing is completely dry before applying fresh lubricant.