Following a diagnosis from VW that quoted $6k for a new engine, I'm trying to help out my sister and her daughter by repairing her TDI. I owned the car for the last 4 years, bought with full history from the original owner. Full Amsoil from break-in on. Timing belt was replaced with a Gates unit @ 89k. Vehicle now has 125k and has had zero issues. Two weeks to the day after giving my niece the car, it shuts off while in a Taco Bell drive thru. They rolled it out of the lane and I helped diagnose the issue over the phone and after checking oil, coolant and electrical, the culprit was a shredded serpentine belt. Here is where things could have gone south. I instructed them that it may have jumped time, and not to attempt to start it until the had the timing verified. They didn't follow my advice. Threw on a new serpentine and tried to fire it. They said it sounded like it tried to turn over but would not start. Fast forward to today, and I've pulled valve cover, oil pan, pass motor mount and have access to the timing belt. It looks to be intact and not missing any teeth. So, with all tension off of the valvetrain, and turning the engine by hand, it will turn almost 180 degrees clockwise and almost 180 counter clockwise but will not go further. Next step is the pull the head, but does anyone have a guess as to why the engine will not make a full revolution? Thanks in advance for any help.