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I've never done this on an Impreza so I'm not 100% sure. I take it the crank pulley is still kinda on? Can you get a picture? Or is the pulley off the car?
timing covers off and have a look , i think the pulley is all one piece of metal i'm not sure, so if it's loose is bolt loose or has bolt snapped its a big bolt normally on a crank but i suppose it could still possibly break , need more detail or circumstances to know more