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"You'll see above in the last picture, that this turbo is a DYNAMICALLY SEALED turbo, and not CARBON SEALED. From what I have gathered, small frame turbochargers before 1990 were carbon sealed, and not dynamically sealed. The carbon seals look A TON different than dynamic seals" - Tekkie
i'm guessing this is what you mean Tek?
![](http://www.gpopshop.com/t25webseal1.jpg)
Exactly. Thanks for posting that. One thing I failed to mention was removal of the piston rings that are on the thrust collar and on the turbine wheel. When I start the rebuild I'll snap pictures of removing/re-installing them.