The truck blew off the oil through the turbo compressor and there was high pressure through the oil cap. After we opened the engine, we found a broken segment. The piston looked normal, so we changed all the segments, piston liner, and the biel bearings. We tested the head, but the hydro test was good, so we changed only the valves. After we finished the engine repair, the truck started well, but after a few minutes of working, it started to blow oil again through the turbo compressor and was making pressure in the oil cap. Any idea what could be the problem? We are thinking of opening the air compressor now and looking for damages inside. The head is good, the segments are alright. Is it possible there is a hidden small hole in some piston causing such high pressure? Any ideas? Thanks
