I'm assuming you've rebuilt a few turbos, and that they run great without being balanced?
It's not that you're not balancing it. It's just that you need to install the wheel back together in the same position compared to each other. That way you don't need to rebalance it. This way it stays balanced. You need to mark the compressor wheel to the shaft so it goes back on exactly how it came off. It's really simple.
The only thing I've ever had an issue with is getting the compressor wheel off. And for most people it comes right off. For me, I had to heat the piss out of it with a heatgun, set the turbo up in a vice, and gently work the shaft down using the vibrations of an air hammer. Again, I was being VERY gentle. An air hammer has less of a chance bending the shaft than a regular hammer and punch.
Just pull it apart being sure to lay the parts out in order, clean everything up with mineral spirits, sand blast the outside of the housings if you want/can, and reassemble the same way it came apart using assembly lube on all the bearings and shafts
Also, make sure you mark the housings to the center section if your not reclocking it. That way everything goes back together in the same orientation it came apart.
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