Based on your description, it sounds like the timing chain cover is where your leak is. If that is the case, yes. REmove the harmonic balancer and timing chain cover to replace the gasket. It will not hurt the engine timing unless you remove the chain or a timing chain gear for some reason.
Let me know what you find or if you have other questions. Also, replace the small 90 degree bypass hose that is at the top of the cover. THey rarely get changed and are usually the hose that goes causing loss of coolant and overheating.
PS: Let me know how it goes.
Sunday, May 2nd, 2010 AT 10:25 PM