The harmonic balancer bolts are vital because it absorbs vibrations and shield the main bearings as well as the crankshaft bearing.
Harmonic balancer bolts' significanceOn many engines, there is a single bolt that secures the harmonic balancer in place. Stock harmonic balancer bolts are torque-to-yield bolts that should not be reused. The harmonic balancer bolt is significant because it fastens the harmonic balancer on the crankshaft.
Common problems with a damaged harmonic balancer boltA damaged harmonic balancer bolt can't be reused.