A harmonic balancer is absolutely an important component. It plays the role of a punching bag for the crankshaft. Inertial mass and energy dissipating element- are two of its basic component. It also has a specific life-expectancy. Well, by knowing the troubling signs, you can spot a bad crankshaft harmonic balancer effortlessly. Increased engine vibration, disrupted timing marks, transmission failures- are certain signs of a malfunctioning harmonic balancer. If you are sure that the balancer is at fault, then consult a certified car technician and fix the issues as soon as possible.