When crankshaft thrust surfaces are reground, what is true?

When crankshaft thrust surfaces are reground, it is essential to use oversize thrust bearings. This is because the regrinding process reduces the thickness of the original thrust surfaces, altering their dimensions from the factory specifications. Oversize thrust bearings are designed to compensate for this reduction in thickness, ensuring proper clearance and function within the engine.

Using oversize thrust bearings allows the thrust surfaces to maintain the necessary fit and alignment with the crankshaft and engine components. It is crucial for optimal engine operation, as proper thrust bearing support is necessary to withstand front-to-back movement of the crankshaft and to ensure the longevity of the engine.