What device allows for equalized cooling of the shaft after securing the engine?

The main engine jacking gear is the device that allows for equalized cooling of the shaft after the engine is secured. This system is used to rotate the shaft slowly and evenly when the engine is not in operation, ensuring that cooling water can circulate evenly around the components. This helps prevent thermal stress and keeps the temperature of the shaft and surrounding components uniform. By using the jacking gear, you can avoid potential warping or damage that can occur if one part of the engine cools at a different rate than another.

In contrast, the cooling pump is primarily responsible for circulating coolant through the engine to maintain operational temperatures rather than managing cooling after the engine has been shut down. The lubrication system is designed for the distribution of oil to reduce friction during engine operation and does not have a direct function in addressing thermal concerns once the engine is secured. The thrust bearing is crucial for handling axial loads but does not play a role in cooling the shaft once the engine is turned off.