Over Heating

[Turbizmo]

Well I got tired of waiting on the guy to fix my car and I decided to open it to check out the timing belt and this is what i found the tensior bolt had broken dont know why but i will get one soon also i dont know if a part fell off the crank here is a pick. They told me that that should not of came off maybe the guy that had fixed it tried to yanked it off and might of broked it i just so let me know whats it call and where can i get it?<a href="http://allyoucanupload.webshots.com/v/2004653378126541734"><img border="0" src="http://aycu08.webshots.com/image/38487/2004653378126541734_rs.jpg" alt="Free Image Hosting at allyoucanupload.com"/></a> what is this called

<a href="http://allyoucanupload.webshots.com/v/2001272451117666948"><img border="0" src="http://aycu31.webshots.com/image/38830/2001272451117666948_rs.jpg" alt="Free Image Hosting at allyoucanupload.com"/></a> this i what came off that part

<a href="http://allyoucanupload.webshots.com/v/2001281360332035136"><img border="0" src="http://aycu24.webshots.com/image/36983/2001281360332035136_rs.jpg" alt="Free Image Hosting at allyoucanupload.com"/></a>
<a href="http://allyoucanupload.webshots.com/v/2001259713538654783"><img border="0" src="http://aycu12.webshots.com/image/38171/2001259713538654783_rs.jpg" alt="Free Image Hosting at allyoucanupload.com"/></a> This is where i think it goes and what the guy told me is that i need to buy the whole sprocket crank i dont know if thats what u call it but let me know.