Take the L shaped PCI card deadplate you removed on page #7. Starting
at the top of the fan shroud, work the short end of the bracket into the
gap at the back of the Mac Pro, as shown above.
Once the bracket is inserted, you can use it as a hook to help pull the
fan assembly out of the Mac Pro. Place the bracket at the bottom left
like shown here. Start putting gentle force on the bracket, pulling on it.
Then....
Using your right hand, wiggle, tug, and pull the entire fan assembly out
of the computer. It attaches to the logic board via a connector that you
don’t need to worry about disconnecting, it’s a pressure fit.
End of Mac Pro 667MHz Install. Please turn to Chapter 4 - Cable Installation
OWC Multi-Mount
Chapter 2 - Mac Pro 667MHz Disassembly
2 MAC PRO 667MHZ DISASSEMBLY