I have gathered the necessary parts to replace the timing belt and today was looking at the crank bolt. When the motor is on, the pulley looks straight, the external belts look straight, there is no "wobble" visible in either the pulley or the belts. However, the bolt head itself looks like it is spinning eccentrically, or like the head is "wobbling."
I asked around and got a couple opinions:
1. Cross-threaded crank pulley bolt. However it seems to me this is not easy to do since the opening for the bolt is narrow, and since to generate the amount of "wobble" I appear to be seeing would require an angle on the bolt head that would probably mean the pulley would not seat correctly. Right?
2. Crank walk. Seems unlikely; also seems like the pulley would wobble along with the bolt. Yes?
3. Malformed or distorted bolt head. The bolt has been removed once before, by the dealer for warranty work. This makes the most sense to me. Yes?
The car runs fine. The belts on the outside are fine; the pulleys are fine, and there is no hint of any problem other than a bolt head that does not seem to rotate "evenly" when I look at it (it's like the bolt head is not in the middle of the bolt, if that makes sense; a "tilted" bolt would explain it but I can't figure out how the bolt would "tilt" that much and still keep everything together for so many years.
Any opinions? I'm going to start removing stuff over the weekend but if I am going to have unpleasant surprises I'd like to have a plan B ready (I don't know how I would deal with a cross-threaded bolt -- do you?).