What action should be taken to address a hot running bearing with interfering clearances?

When addressing a hot running bearing with interfering clearances, relieving the shiny portion by scraping is a valid approach. This method helps to eliminate the areas that are making contact improperly, causing friction and heat build-up. By scraping, you can create a better fit or clearance, allowing for improved lubrication flow and reducing the risk of further damage to the bearing.

The shiny portion indicates where excessive wear or contact is occurring. This can often be a sign that the bearing is not properly aligned or that there is excessive friction due to inadequate or improper lubrication. By scraping the surface, an engineer can improve the operational characteristics of the bearing and address the root cause of the heat generation.

While replacing the entire bearing might seem like a thorough solution, it may not be necessary if the issue can be resolved through careful adjustments. Simply adding additional lubrication could mask the problem without fixing the underlying issue concerning the clearances, and cooling the bearing with water is not a typical or advisable practice as it can lead to further complications like thermal shock or contamination of the lubrication system. Thus, scraping the shiny portion addresses the problem directly and is an appropriate course of action.