Looks like a water pump pulley from a I-4 Zetec (thanks, Brapple). Your car should overheat. Don't drive it anymore or you wil be looking at a headgasket job ($$$$$$).

Open up the hood and compare to Figure 11. Then you can confirm which pulley it is.
http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/1b/be/f3/0900823d801bbef3.jsp

and this.
http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/1b/d6/8b/0900823d801bd68b.jsp


Last edited by Tony2005; 07/13/06 03:11 PM.
"Always do the cheap and easy ones first." 1996 V6 ATX 96K miles