My harmonic balancer just went. The rubber is gone. Now the outer part is spinning and making noise. Also my car isn't running good at all. My questions are; will it hurt the engine if I drive around for a few days with out it, and when replacing the old one how do I know where the balancer goes in? is there a mark on the inner piece that will tell me, so that I can put the new one in the same position?

 

I definitely would NOT drive around w/ a faulty harmonic balancer. The balancer's purpose is to absorb/eliminate any torsional stress that occurs to the engine's rotating assembly (mainly the crank).
There is a keyway on the balancer; it'll only go on ONE way.
The crank has a raised insert (key) that fits into the long slot (keyway) on the harmonic balancer.
When you have a look, you'll know what I'm talking about.
Get a 'gear puller' (steering wheel puller) to remove the old balancer. If the rubber is broken, the unit may come out in 2 pieces.
Tap the new balancer/dampner back on w/ a block of wood and a hard rubber mallet. Never hit the balancer directly w/ a steel hammer.