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The turbo and it's pedestal have a high degree of harmonic vibration. Bolt torque is not an answer to preventing the bolts from loosening.
There are a few ways to preventing a bolt or nut from coming loose. While a common method is to use an adhesive compound on the threads, it can be counter productive when it comes time to disassemble the parts for maintenance. The rear bolt is a good example of when things go bad and using thread locker would just make it worse.
A decades old method used before the ease of thread locker compounds and still used in military and aviation is to use safety wire ties to prevent the bolt or nut from unscrewing. It's not that hard to do once you learn the basics and using wire to retain these bolts would be the best choice IMO.
Here is a good write-up about using the techniques:
Safety Wire Techniques
Former Vehicle Test Manager, Friction Products.
03 F350SC 4x4 6.0 Auto 5/30/03
Truck Modifications below in Pictorials on Facebook. Search in Google - Facebook TooManyToys
Step Lights;Painted Flanges; Bypass Oil Filter; Heated Mirror Switch; Reverse Lights; 7.3L Fuel Reg Shim; 6 Disc Radio Speed Volume Mod; Coolant Filter, etc.
Last edited by TooManyToys; 06-10-2010 at 04:26 AM.