They are very very simple. I watched my favorite machinist do mine. The amount of normal free play is surprising. Be careful not to dent the turbo blades. The blades should not erode too much unless you run it without a filter. The hardest part is separating the halves of the housing, IIRC.

They are very very long lived units.

IIRC the "kit" consisted of two o rings and a gasket. I had to buy the mounting gaskets separately and it really honked me off as I paid about 125 for the kit.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.