In order to remove and replace the fan shroud, start by removing it when necessary. In engines which have a separate Harmonic Balancer, loosen the retaining bolts and separate the Harmonic Balancer from the crankshaft. The second step is to remove the retaining bolt of the Harmonic Balancer from the crankshaft end. Remove the Harmonic Balancer from the crankshaft using a puller. When installing, make sure that the key slot on the Harmonic Balancer hub is aligned with the crankshaft key, then reassemble in reverse order and tighten the retaining bolts to the required torque.