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Nostalgic

Mine was kind of hard to figure out the chicken/egg part. The vgt ring, the plate on the exhaust housing held in with snap ring, was loose. It had heavy wear from the vanes contacting it. Also, like I mentioned, the studs that hold the pivoting part of the vane shroud, that moves the vanes in and out of the plate was loose and worn. I could be using totally incorrect terms for the parts too.

Did the plate working against the vanes cause the vibration and wear on the pivoting assembly? Or did the loose pivoting assembly cause the wear on the plate and make it loose? I dunno. It could have even been when I reclocked the hot side against the center section and damaged something that cascaded into the failure.

I do know, from splitting my used OE Holset and checking, that the vanes that move back and forth DO wear some. I would guess that unless something actually wears out to the point of failure, that typical sticking is from the worn section of the vanes catching on the plate just enough to throw the VGT actuator out of calibration. Just speculative guessing since I don't rebuild them, or tear them down on a regular basis and my sample pool is a whopping two turbos in total haha.

I will say, that even though I rebuilt a turbo that's probably isn't balanced correctly and I'm afraid to use, it was more beneficial to me overall, just seeing how they work, than anything. Seeing and understanding the oil seal in particular, really made me understand how weeping some oil is NOT indicative of any defect of the turbo itself, especially if you check with a dial indicator and the wheel isn't contacting the housing.

Here's the only pics I could find - not real helpful.