Use an impact wrench. The 3/8 inch models do not have enough torque for this job so use a 1/2 in wrench. Jam the belt with a piece of wood so the pulley doesn't turn. Use an socket designed for an impact wrench, which has a tighter fit on the crankshaft (or "harmonic balancer") bolt head than a socket meant for a hand tool. This will keep you from marring the bolt head. The bolt is threaded normally, not reverse threaded.
I am a believer in using hand tools wherever possible. The service manual shows the use of a special hand tool. It is a semi-circular piece of metal attached to a handle. The semicircle is attached to the crankshaft pulley by two bolts that go through two holes that you can see in the pulley. The idea is to hold the pulley with this tool. The semicircle leaves the pulley bolt exposed so you can put a wrench over it and turn it. However it would be hard to find this tool for sale in the USA. To losen the pulley bolt you will need a breaker bar with a long extension. If you have the car up on a lift then you have room for a long handle, but if you have it on jackstands you won't. My conclusion is that the impact wrench is the practical way.
Remove the belt. Remove the bolt that attaches the harmonic balancer. Rent or purchase a harmonic balancer puller. Follow the Instructions with the puller and remove the old balancer. Install the new balancer making sure to line up the keyway, a little oil helps. Put the retaining bolt back in and tighten to manufacture specs.
You will need a harmonic balancer puller. Remove crankshaft bolt and washer, reinstall bolt without the washer approximately 10 turns. This will protect the threads in the crankshaft. Install puller and remove balancer. You cannot remove the balancer without this puller. They are inexpensive or try to borrow one.
Remove belt,4 pulley bolts and remove pulley. Remove harmonic balancer bolt and washer,reinstall bolt with out washer,just in about half way.You will need a harmonic balancer puller.These are not very expensive about $20.00 or borrow one from somebody.You just thread the correct included bolts into the balancer where you removed the pulley bolts and will be pushing on the reinstalled balancer bolt.The balancer should clear the bolt head without the washer.This is so you don't damage the threads in the crankshaft.
The harmonic balancers function is to reduce vibration between the engine and the crankshaft. To replace the harmonic balancer requires a specific tool available at an auto parts store. Loosen the crank pulley via 4 bolts to access the balancer. Using the tool remove the harmonic balancer from the crankshaft.
first remove serpintine? fan belt then remove large bolt in middle of harmonic balance. this bolt usually has left hand thread next with a harmonic pulley ,puller, remove harmonic balancer.when removing this, there is a key in the balancer and shaft if a new key did not come with new balancer,make sure not to loose the old one install new balancer with key.use the bolt to pull balancer up tight where it needs to be and use proper torque on bolt
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