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To get just the harmonic balancer off you will need a heavy duty gear puller; they do make harmonic balancer pullers but a really good gear puller will work just as well. Whatever you do, don't try prying it off with a bar, or hitting it with a hammer; you'll either damage the crankshaft or the balancer or possibly both.
It's also a lot easier to do when the motor is out of the car; you'll need a lot of room to work getting it off.
Back to the balancer; take all of the belts off, loosen the bolt in the center of the balancer (you will need to lock the flywheel so the crank doesn't turn when you try to loosen the bolt). Once it's loosened, take it out a couple of turns, but no more than that, attach the puller and start pulling it off, once you see it move, you can take the puller off, remove the bolt, you should be able to pull it off by hand now; if not, reattach the puller, and finish pulling it off. There is a little "guide pin" in the crankshaft called the Woodruff Key, you'll want to take it out and inspect to see if it shows any wear, or distortions, if so, replace it. Leave it out until you're ready to reinstall the balancer; it's how the balancer lines up with (and holds it in place) crankshaft. This is not a job for a beginner.
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