🔍 Key Concepts

• Line shaft bearing overheating causes and symptoms • Role of lubricating oil flow and pressure in bearing cooling • Why sudden changes like flooding with different oil or external water can be dangerous

💭 Think About

• Think about what actually removes heat from a sliding/rolling bearing in normal operation. • Ask yourself what happens inside the bearing surfaces if lubrication briefly fails or is marginal. • Consider whether adding external substances (like water or different oil) changes the root cause or might damage the bearing or shaft.

✅ Before You Answer

• Identify which option best restores or improves proper lubrication and heat removal rather than adding a new risk. • Eliminate any choice that would shock cool hot metal or contaminate the existing lube system. • Check which action is most consistent with standard engine room casualty control procedures for hot bearings after speed reduction has not solved the problem.