Assuming it's like the 617 front seal (pretty sure it is) it's just a standard one piece lip seal like most American engines. Piece of cake = it pops out from the front and you put a SMALL amount of sealer (anerobic works well) on the OD and carefully tap the new one in. You'll have to remove whatever stuff is on the front of the engine (alternator, PS pump, etc.) and pull the vibration dampener. When you pull the dampener check the surgace that the seal rides on - it needs to be smooth and flat. Small imperfections can be polished out with emery paper but gouges will need either a new dampener or, if available (I haven't looked) a repair sleeve.

Dan