If you are looking for a for industrial machinery (like a power unit for a conveyor or compressor), then the keyword is "industrial diesel engine" or "factory remanufactured engine."
A die grinder is a handheld rotary tool designed for grinding, sanding, honing, polishing, and deburring. The term "factory die grinder" distinguishes industrial-grade models from hobbyist tools. These machines are built for continuous duty cycles, high torque, and extreme durability. They are the unsung heroes of tool rooms, die-casting facilities, and aerospace engineering plants. factory diedangine
If you are looking for a (the hydraulic power unit that injects molten metal), search for "die casting machine power unit" or "hydraulic die casting engine." If you are looking for a for industrial