Had a real tuff time removing the damaged bolts without ruining them or the crank threads. Ended up cleaning up the crank threads easily but the bolts would not clean up so I ground off the first thread... Imagin replacing a crank because you ruined the threads. A crank that has been balanced to your rotating internal parts... whos gonna pay that labor bill plus parts.....
My best swag would be something didn't tighten up properly or the bolts were suspect and folded on you. This does happen but very very seldom happens. These pressure plate and crank to flex or flywheel bolts are a special hardened material and still available from both Ford and International. Its a good idea to replace them whenever a flexplate or flywheel is installed or removed. The sealant used by mny here is the blue loctite and its a great sealant and thread to fastener hold. Its easily broken loose when you remove the parts for work. Occasionally I have had issues removing my fan clutch after I use the blue on those fine threads but... I'm happy to add some weight to remove a tight fastener instead of having the fan clutch loosen up when these exstremely high compression engines stop when we shut down the engine.
