1992 740 Turbo oil leak/ crankshaft DIY help!

Could you take a photo so we can see exactly what has happened?

crankshaft bits 

Here are three photos of the parts in question.

You should be able to reassemble them, just make sure each one is located properly before putting the next on. As for the washer, you should be able to hammer the dent out by putting it on something hard and hitting it in the right place. I'm wondering if the oil leak has occurred because that pulley assembly was wobbling like crazy due to not being located properly.