What is the effect of excessive torque on bearing journals?

Excessive torque on bearing journals can lead to a decrease in durability. When torque exceeds the designed specification for a bearing journal, it can create excessive pressure on the bearing surfaces, leading to increased wear and potential damage. This can cause the bearing material to deform or become compromised, ultimately leading to failure. The bearings rely on a thin film of oil for lubrication, and excessive torque can disrupt this film, leading to metal-to-metal contact, increased friction, and a higher likelihood of overheating. Over time, these factors contribute to a significant reduction in the lifespan of the bearings and the overall engine performance. This is why understanding and adhering to the specified torque values during assembly is crucial for maintaining the integrity and functionality of engine components.