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Can you manually rotate your engine at the harmonic balancer?

No, the harmonic balancer is used to dampen crankshaft torsional vibrations and thus the engine should not be rotated by the balancer. Engine rotation for timing belt/chain alignment should be done either by manually turning the crankshaft bolt using a wrench, or by setting the vehicle in neutral and rolling/towing the vehicle slightly with a key in the ignition in the ON position.