Perkins Engines IOPU IOPU (Industrial Open Power Unit) Perkins engines are designed for variable speed engines,radiator to flywheel housing for industrial applications. Marine Engines Perkins marine engines outclasses anything the competition has to offer and provides the best possible customer experience throughout the engine’s lifetime. Power Generation Electropak - Radiator to flywheel housing for power generation fixed speed. Engines are supplied with air filters. Reman Engines A rebuilt/remanufactured engine is an engine that has been remanufactured to prescribed specifications by skilled machinists and state-of-the art technology. Standard Base Engines Designed for variable speed engines for industrial applications, fan hub to flywheel housing. Engines are supplied without cooling pack or air filters. Manuals Our manuals section offers access to obtain manuals no longer provided by manufacturer.