It is the idler pulley. There is a hole in the center. I can't make out whether it is a torx, alllen if anything. The engine is a 3.8 liter.
P.S. I'm not a complete novice. I've probably replaced 5 or 6 water pumps over the years. I've even replaced timing belts.
Friday, September 19th, 2008 AT 7:35 AM