dsherman26
Member
The "one time use" fastener doesn't always mean it's a torque-to-yield fastener. My Honda's service manual calls out a couple of bolts that recommend they not be reused: The idler pulley bolt for the timing belt is one, because the replacement bolt comes with dry threadlocking compound on it that activates when it's torqued in. The torque isn't all that high, but they don't want technicians spending the time cleaning off the old threadlocker and applying new stuff when the new bolt is dirt cheap. Having that bolt come loose would be especially bad because it will cause a lot of destruction if it did, so they really want you to have fresh threadlocker on it. The motor mount bolts also say "don't re-use", but I gather that was more because they are probably rusted to heck and they would rather have you use a new bolt instead of tearing up the the threads and possibly stripping them.