page_title: Fordson
section_title: Fordson origins, Model F, and Model N
hierarchical_section_title: Fordson / Tractors / Fordson origins, Model F, and Model N
caption_attribution_description: English: A cutaway view of the engine of the original Fordson tractor. Visible are the crankshaft, connecting rods, pistons, bearings, water jackets, and other principal parts, labeled in English.
context_page_description: Fordson was a brand name of tractors and trucks. It was used on a range of mass-produced general-purpose tractors manufactured by Henry Ford & Son Inc from 1917 to 1920, by Ford Motor Company and Ford Motor Company Ltd from 1920 to 1928, and by Ford Motor Company Ltd from 1929 to 1964. The latter also later built trucks and vans under the Fordson brand.
  After 1964, the Fordson name was dropped and all Ford tractors were simply badged as Fords in both the UK and the US.
context_section_description: The first prototypes of the new Henry Ford & Son tractor, which would later be called the Fordson, were completed in 1916. World War I was raging in Europe, and the United Kingdom, a net importer of food, was desperate for tractors in its attempt to expand its agriculture enough to feed Britain despite the great shipping disruption of the war. In 1917, the British Ministry of Munitions selected the Fordson for both importation from the U.S. and domestic U.K. production. It was thought that domestic U.K. production was preferable because so much Atlantic shipping was being sunk that exporting tractors from the U.S. would be counterproductive, as many would be lost at sea. This was soon modified to exclude the London area because of concerns about its vulnerability to German attacks. Henry Ford decided to build the tractor at Cork, Ireland (which at the time was still part of the U.K.), partly because he wanted to bring jobs to, and foster industriousness in, southern Ireland. But the Cork plant did not begin production until 1919, after the war had ended. As events turned out, thousands of tractors were exported from the U.S. in 1917 and 1918. 
  The tractor used a 20 hp (15 kW), inline four-cylinder engine. The engine was similar to the Ford Model T engine in many respects. Like many engines of its day, it was multifuel-capable; it was usually tuned for gasoline or kerosene, but alcohol could also be burned. (Tractor vaporising oil [TVO] existed in 1920 but was not yet widely used. It entered broader use in the 1930s and 1940s.) Like many other multifuel machines, the Fordson started on gasoline from a small auxiliary tank (just a few quarts) and then switched over to the main fuel tank once warmed up sufficiently (no more than 5 minutes). To handle the kerosene (or, rarely, TVO), the intake system had a vaporizer downstream of the carburetor. The mixture coming from the carburetor was intentionally rich, and the vaporizer heated it and mixed it with more air to lean it out to the final ratio before entering the intake manifold. The intake system also had a water-bath air cleaner to filter the dust out of the air inhaled by the engine (an invention that did not originate at Ford but that was still rather novel in 1917). Air cleaning is critical to engine lifespan, even for road vehicles and most especially for farming and construction vehicles (which work in environments where dirt is frequently stirred up into the air). The Fordson carburetor and air cleaner were designed by Holley. In later decades, the water bath would be replaced with an oil bath for better filtering performance. 
  The ignition system was similar to that of the Model T,with a flywheel-mounted low-tension magneto and trembler coils. The ignition timing was manually advanced or retarded with the spark advance lever mounted near the steering column, which rotated the timer. The cooling was by thermosiphon. (In later decades, a high-tension magneto and a water pump would be added.) The transmission was a three-speed spur gear (the three forward speeds ranged from approximately 2​¹⁄₄ to 6​¹⁄₄ mph). A worm drive reduction set and a differential made up the rear. The design of the rear was patented for its ease of manufacture and service. Brakes were not provided on early Fordsons, as high-ratio worm sets generally transmitted rotation in one direction only, from the worm element to the gear element, because of the high power loss through friction. To stop the tractor, the driver depressed the clutch. 
  Ford engineer Eugene Farkas successfully made the engine block, oil pan, transmission, and rear axle stressed members constituting the frame. By eliminating the need for a heavy separate frame, costs were reduced and  manufacturing was simplified. Ford held a patent on a unit-frame tractor. The rear wheels were fabricated steel, spoked and cleated. The earliest ones were 12-spoke; a 14-spoke version followed. Several models of front wheel were used, including 10-spoked fabricated steel and 5-spoke cast iron. Industrial models also used other wheels designed for 
caption: A cutaway view of the engine of the original Fordson tractor
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