Tdi help.

Hi, so I just had my turbo rebuilt. Did a really nice job. Upon reinstallation when I started it there was a lot of white smoke, as well as oil running out of the tail pipe. So I called the shop they say I need to check clearance, and measurements?? *** are they talking about? He said I don't need to pull the turbo again. Does anybody have a clue about this?? Please

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Tdi help.