The submarine was given a German-style conning tower that replaced the French-designed wet lookout platform. She was equipped with more powerful diesel engines, which increased her power output from 480 to 840 brake horsepower (360 to 630 kW). U-14's fighting potential was further enhanced by the installation of larger fuel tanks, which nearly quadrupled her range to 6,500 nautical miles (12,000 km), up from her former maximum of 1,700 nautical miles (3,100 km).[1]