My experience with the t25 in my 190D. Not only isn't it worth doing yourself, you may end up needing a pro rebuild anyway. The case on mine is held together with a giant snap ring and four bolts. It required an 18" snap ring pliers to remove the ring. You won't find one of those at Autozone. The four bolts promptly snapped off, requiring a shop to drill and retap. And when it was apart, the compressor wheel turned out to be damaged and needed replacement. Once you begin replacing rotating parts, the assembly must be professionally balanced. In the end, the whole thing went into a box and was rebuilt by cheetah Turbo. It cost me more than if I had just sent it out to begin with.

On balancing, you MUST MARK the components precisely so that they have the same orientation when you reassemble. Something that rotates at tens of thousands of RPM will simply fly apart if balance is less than perfect.

As I said, I'll check the wiggle of the shaft before I break a bolt. If it wiggles then I'll make preparations to buy and balance a new assembly.

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84 300SD
85 380SE
83 528e
95 318ic

This is the turbo wheel and shaft I'm using on a T3. And correct the turbine housing and compressor housing must be marked and installed in the same position.

I haven't found a pictorial here on turbo rebuild. Perhaps you'll do one if you haven't already started. I appreciate it.

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84 300SD
85 380SE
83 528e
95 318ic

I haven't started yet. I'm going to do glow plugs and then rebuild my injectors first, hopefully that's not the last time it runs.