It depends on the extent of the damage. If the crankshaft is bent or cracked, it will need to be replaced. However, if the damage is minor, such as a small crack or a worn bearing surface, it may be possible to repair the crankshaft. This can involve welding the crack, grinding the bearing surface, or applying a metal coating.
The decision of whether or not to repair or replace a crankshaft should be made by a qualified mechanic who has experience with Alfa Romeo engines.
