How do you change the harmonic balancer seal on a Toyota truck?

To change the harmonic balancer seal on a Toyota truck, first, disconnect the battery and remove any components obstructing access to the harmonic balancer, such as the serpentine belt and crankshaft pulley. Use a puller to carefully remove the harmonic balancer from the crankshaft. Replace the old seal with a new one, ensuring it's seated properly, then reassemble by reversing the removal process, tightening bolts to the manufacturer's specifications. Finally, reconnect the battery and check for leaks.