The resulting metal as well as carbon from the combustion process must be cleaned from the oil to ensure long lubrication. The thicker a lubricating oil or grease is, the higher its viscosity number. The three types of magneto ignition systems are mechanical-breaker, capacitor-discharge, and transistor-controlled. Lawnmower Repair Manuals, Small Engine Repair Manuals, Snowblower Repair Manuals, Chainsaw Repair Manuals. Magneto-Powered Ignition System: A magneto uses magnetism to supply electricity in ignitions where there is no battery. The flywheel delivers the engine's power to devices wheels, blades, etc. To better understand small gas engines, let's look at how this vital system works.
After combustion, its downward movement rotates the crankshaft. Combustion The combustion system of a small gas engine is where the work gets done. They furnish the fuel for combustion and remove exhaust gases. While written at basic level, these materials contain clear and accurate instructions for both troubleshooting and repair. Battery-Powered Ignition System: If your small engine includes a battery for starting, the ignition coil will also use it to supply spark to the spark plugs. Each system has many components.
However, when sprayed as a mist and mixed with air, it is quite explosive. It distributes the spark to the appropriate cylinder using a rotor, cap, and individual spark plug wires. Crankshaft: An engine's crankshaft is a metal shaft with an offset section onto which the connecting rod is attached. . Mechanical-Breaker Ignitions: High-voltage electricity must be sent to the spark plug at the appropriate time. Flywheel: At the end of the crankshaft is a circular weighted wheel called a flywheel.
A battery stores electrical energy until needed. Viscosity: An oil's viscosity is its resistance to flow. This drawing reviews the typical components of a fuel system on a two-stroke engine. Air-Cooling Fins: For simplicity, most smaller gas engines are cooled by air. Wires: The primary wire from the coil to the breaker point and secondary wire from the coil to the spark plug s deliver electricity to the ignition components.
In the next section, we'll review how, where, and when to service this engine. Spark Arrestor: A spark can exit the exhaust port of a small gas engine, potentially starting a fire on nearby combustibles. It produces and delivers the high-voltage spark that ignites the fuel-air mixture to cause combustion. The coil changes low voltage 6 or 12 volts into the high voltage 15,000 to 30,000 volts needed by the spark plug. Ignition The ignition is a primary system within all small gas engines. Governor: A governor is a device that automatically opens the engine's throttle when more power is needed and closes it when the load is light.
Carburetor: The carburetor has one job: to mix the correct proportion of gasoline and air for the engine. Pump: A fuel pump produces a vacuum that pulls the fuel from an unpressurized tank, then delivers it to the carburetor. Small gas engines are typically cooled by air. Movement of the piston down in the cylinder then rotates the crankshaft. In mechanical-breaker ignitions, this job is performed through the contact points and a condenser. The small end is attached to the piston pin.
Muffler: Small gas engines, especially two-stroke engines, are noisy when they operate. Cylinder Head: The cylinder head is the top, or ceiling, of the cylinder and is attached to the block with bolts. Two-stroke engines require that oil be mixed with the gasoline to lubricate internal parts. Moving parts wear, even with the best lubricants. Some fuel tanks are pressurized with air to help deliver fuel to the carburetor. A primer is used to help start a cold engine. Gasoline: Gasoline is a combustible liquid that burns relatively slowly.
Regularly servicing your small engine will ultimately save you money and time. Heat and friction -- if not controlled -- can quickly damage an engine's components. Points: As the crankshaft rotates, a cam opens and closes a set of contact points. In this article, we will discuss the systems and components that make small engines work. Metal fins around the outside of the combustion chamber help dissipate the internal heat.
Filter: A carburetor jet has a small opening that can easily become clogged. All it needs is a spark. Distributor: A distributor is an ignition system for engines with more than one cylinder and spark plug. They also power our fun: outboard boats, snowmobiles, motorcycles, all-terrain vehicles, ultralight aircraft, and other toys. Friction: Friction is resistance that occurs when one surface rubs against another. A reed valve in a two-stroke engine is activated by changes in air pressure. Cylinder Block: The largest single part in a small gas engine is the cylinder block.