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This is not an easy job and requires a substantial amount of knowledge. you will also need a decent floor jack or a transmission jack. The transmission must be pulled or slid back to get the flywheel off the engine. The first thing is to take the transmission dust cover off or in some cases the starter. The starter needs to come out anyway. This will reveal the torque converter bolts. You can use a pry-bar to turn the flywheel around so you can get to each torque converter bolts. The other option is to turn the crank with a socket and breaker bar from the front of the engine/harmonic balancer. Then you must drop the transmission or if you can slide it back enough to reach the flywheel bolts mounted to the crank. Once you remove the center bolts in the flywheel it should drop out.
There is one bolt in center of pulley/harmonic balancer. Sounds like the harmonic balancer has started going bad..if bolt in center of pulley is loose...which is fairly uncommon tighten which you just tighten Iike any other bolt. If it is tight then you will need the replacement. Replacement is a good bit more involved. Radiator has to be removed, special tool, harmonic balancer pulley remover is required..it will remove pulley. Then you line up pulley with keyway..tap on with rubber hammer until pulley is on far enough for bolt to be started..tighten the bolt and it pulls the pulley all the way into place.
The retaining bolt comes off in counter clockwise turn, they most likely used lock tight when it was installed and it is installed at probably 1200 lbs torque. the 21 gal compressor most likely doesn't have the power needed to remove that bolt. Once the bolt is removed you need the special tool to remove that balancer, it is a 3 leg pulley puller with a center insert that sits in the same hole that bolt comes out of and the pulley puller applies pressure to that insert while pulling the pulley off.
That is not good. They are rubber mounted for vibration, over tightening the belts will pull it apart, it takes years, but they do fail. They cost about $100, and are not easy to replace. You need a big pulley puller and a big breaker bar with a socket for the crank shaft bolt. Hope this helps.
You also lost the bolt that holds it on. You can sometimes get away with pulling it in with a longer bolt, using washers until the original bolt will catch to flush it up with the end of the crankshaft. Do not hammer on the outside. There is a rubber insulator on most, and this will destroy it.