093 turbo inspection questions

ifrythings

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Going through my factory ats 093 turbo and there’s a few things that look odd that I’m hoping the turbo rebuild guys could help with.

First is the center section on the exhaust side where an oil sealing ring runs, is it supposed to have a grove in it?
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Second is the oil sealing ring has wear on only one side, it was tweaked slightly when I pulled it apart, not sure if it’s been running that way or I bent it when removing the shaft?

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Any help is really appreciated as my truck is down right now.
 

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