CHAPTER III ENGINE PARTS Base—Bearings—Cylinders—Crankshaft—Piston—Connecting rod—Wrist pin—Piston rings—Valves—Cam—Valve mechanisms—Cooling system 30 CHAPTER IV FUELS AND CARBURETION Oxygen necessary for combustion—Forming a mixture—Rich and poor mixtures—Carbon—Preignition— Carbureter—Spray nozzle—Evaporation of fuels—Carbureter principles— Extra air inlet—Effect of heat on mixture—Loading— Strangler 52 CHAPTER V CARBURETERS Carbureter parts—Manifold—Action of carbureter—Float feed—Kerosene and gasoline—Descriptions of carbureters—Pump feed—Use of water in the mixture—Application of heat—Fuel pumps—Air cleaners—Governors 70 CHAPTER VI IGNITION Principle of ignition—Point of ignition—Preignition—Advance and retard—Parts of ignition system—Magnetism—Induction—Magneto—Action of armature—Armature windings—Circuit breaker—Circuit—Shuttle and inductor armatures—Sparking current—Grounded circuit— Magneto parts—Impulse starter 102 CHAPTER VII BATTERY IGNITION SYSTEMS Principle of spark coil—Windings—Timer—Atwater-Kent system—Vibrator—Spark plugs 131 CHAPTER VIII TRANSMISSION Transmission parts—Clutches—Necessity for change speed gear—High and low gear—Types of change speed gears—Necessity for differential—Principle of differential—Drives—Worm 143 CHAPTER IX TRACTOR ARRANGEMENT Tractor requirements—Tractor types—Engine position— Front axles—Spring supports 167 CHAPTER X LUBRICATION Importance of lubrication—Effect of oil—Kinds of oil—Effect of temperature on oil—Using the right kind of oil—Burning point—Viscosity—Lubrication charts—Oiling systems—Oil pumps—Mechanical oiler— Oil cup—Grease cup 175 CHAPTER XI TRACTOR OPERATION Using a new tractor—Breaking in—Daily inspection—Driving—Shifting gears—Driving on hills—Using the engine as a brake—Cold weather conditions—Starting in cold weather—Protection against freezing—Starting a tractor 201