[Ieatcamaros]

He means try not to mess up the threads. You don't need an air compressor. That's just the easy way to do it. Do like Jeff said and use a breaker bar. You'll eventually get it loose. When you start to pull the balancer off and you see part of the key, I would rotate the engine to where the key is on top. Just in case it wants to fall out, it won't fall into the oil pan. I have never seen or had this happen to me, but it is cheap insurance. I assume you are going to put in the new oil pan gasket ends, oil pan end seals, and a new front seal. Just be careful when putting the timing cover back on with everything in place. Sometimes that oil pan end seal wants to squirt out from underneath the timing cover, either into the oil pan or outside the oil pan. Again, this is a rare occasion but it's something to think about.

Merry Christmas