So a truck came into the shop this weekend. Complaint is vehicle stalled and will not start. Compression check shows problem on bank one. Manual compression check of cyl 4 shows 0 psi compression. When glow plug was removed it was noticed that tip was missing. Removed injector and found tip of injector damaged. Engine will come apart tomorrow. I am not the tech working on this vehicle but I am watching closely to see what is going on.