SR20DET Black Top Knocking Sound

[goad_white03]

Was wondering if anyone can help me out, I got a S13 with a SR20DET Black top swap. Its making a knocking sound. Was afraid it was a rod bearing, pulled the pan and filter, there was 0 metal in it also have a magnetic drain plug. Please see the link below for a video. Wondering if its a broken chain guide or tensioner. Any help is great before i rip it apart.

https://www.facebook.com/photo.php?v=728033187210436&set=vb.100000112832771&type=3