A centrifugal pump, with a three-blade, 2 1/2" rotor, is located in the front of the cylinder head. This pump is driven by a fan pulley keyed to the pump shaft. the fan is the two-blade, airplane propeller type, 16 inches in diameter, driven by a V-belt, 5/8" wide. The shaft is carried on a flexible roller bearing. The fan has a capacity of 855 cubic feet of air per minute at 1000 RPM of engine. The radiator is the fin and tube type containing 2 1/2 imperial gallons. It has 94 tubes staggered for maximum efficiency. The cooling system is so designed that it will function by thermo-syphon at low speeds, the pump acting as a booster at high engine speeds. This permits a cold engine to warm up quickly, but prevents overheating at high engine speeds.

Should the pump get out of order, the water will circulate by Thermo-Syphon, independent of the pump action, as sufficient clearances have been allowed to permit water to pass by the pump impeller.
The spacious water jackets around cylinders, valves, and cylinder head, and the low speed of the Ford engine permit hour after hour of hard, gruelling performance without the least sign of overheating.