Sounds like a loose chain. I just helped a friend repair his Toyota that had done that. The chain being loose had eventually worn down the head of an adjustment bolt head it had been hitting against.
Did you ask them to replace the timing chain or did you ask them to fix the knock? If they misdiagnosed the work, you need to speak with the service manager. Be nice but firm. If that doesn't get you anywhere, speak with the general manager, then owner. At the very least the work should be discounted. You did get something of value, but the wrong something of value.I just got it back from Chrysler
http://www.wranglerforum.com/showpost.php?p=57898&postcount=6they paid all but $225. I wouldn't call it a repair I just went out and listed to it again and it's just as bad. Now I'm thinking or maybe I'm just hoping its the rocker/lifters. is there any adjustment on the rockers? Or how do you fix them if there noisy?