I am confused by some of the termanology.

The Turbine Wheel is the one that gets turned by the Exhasust Gasses coming out of the exhauts Manifold.

The Compressor Wheel is made of Aluminum and is on the Intake Side of the Turbo Charger.

The Exhaust Gasses push the Turbine inwards towards the Compressor end of the Turbo and that eventuall wears out the Trust Bearing and at the same time Thrust Bearing wear moves the Compressor Wheel closer and closer to the Turbo Intake Housing and if it gets bad enough the Copressor Wheel rubs on the Turbo Intake Housing.

When the Bearings in the Turbo wear the side play increases but from what I have been reading most of the failures seem to be from the Thrust Bearing Wear.

The Turbo 617s have Turbos that use Dynamic/Piston Ring type Seals on the Turbine end and the Compressor ends.
The later Modes eventurally switched to one of 2 types of Carbon Seals on the Compressor end. As far as I know the Turbing Ends always have the Dynamic Piston Rig type Seals.

When you read the rebuild turbo threads no one is measuering the Bearing Bores, Turbine Shaft Journals or the wear in the Ring groove on the Turbine Shafts.

That means onece in a while someone fix does not work as they expected because replacing the Bearings with the stock size and replaceing the Seals is not an entire rebuild.

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84 300D, 82 Volvo 244Gl Diesel