Originally Posted by
HillRider
You don't want to do this. If you torque the cranks properly to spec the first time they should never come loose. However, if you check them some time later you will indeed find the bolt or nut turns a bit more if you apply full torque again. That's normal and has a good mechanical reason why it should happen. It does not mean the crank is coming loose. However, if you persist in applying full torque periodically, you will "chase" the crank up the taper and eventually crack it. Torque it to spec once and leave it alone until you remove it again.
IMHO your wrong here. The whole idea of using a torque wrench is to properly tighten a bolt (or some other threaded item). The danger of chasing the crank up the taper comes from those that pull out a wrench and check the tightness without a torque wrench. According to your theory, the crank bolt will loosen with use, but you should not tighten it. One can regularly check the toque of any bolt as long as you use a torque wrench and don't exceed the proper torque setting.