Harmonic balancer bolt did not loosen and pulley rotated about 1 inch

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. If the harmonic balancer pulley rotated while trying to remove the bolt, it may not have affected the timing of your 300M. The harmonic balancer is mounted to the crankshaft and doesn’t directly affect the timing chain or belt if it moves slightly while attempting to remove it. Ensure you’re turning in the correct direction and using the proper tools when removing the bolt. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!