During engine overhaul, what should be done if ball or roller bearings exhibit magnetism but are otherwise defect-free?

When ball or roller bearings exhibit magnetism but are otherwise defect-free, it is essential to degauss them before use. Magnetism in bearings can indicate the presence of metal particles or contaminants that may have adhered to the bearings, possibly affecting their performance. Degaussing removes this magnetic field, ensuring that the bearings can operate smoothly and reducing any risks of attracting metal debris from the operating environment. This process is crucial, especially in precision applications where even the slightest magnetic interference can lead to premature wear or failure.

In contrast, simply replacing the bearings may not be necessary if they do not show any other signs of defects, while using them without any treatment could lead to performance issues down the line. Lubricating them also would not address the underlying concern of magnetism and could, in fact, potentially trap any contaminants. Therefore, degaussing is the best practice to ensure that the bearings are in optimal condition for use.