Hey guys. I recently bought a 2007 a4 quattro 2.0 with a broken timing belt. I had a machine shop go through the head, got everything assembled, disabled the fuel pump fuse and cranked the engine to prime the system. After I got oil pressure i started the car and within 15 seconds the intake cam locked down. The shop says I didnt prime the system properly. Im looking for advice before the new head goes on. Anh input would be greatly appreciated.