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Spark Plug

Spark plug
A spark plug creates the required spark for igniting the fuel and air mixture in the combustion chamber which in turn allows the engine to run. It is shaped like a small cylinder.

Parts of Spark Plug
Basically, the spark plug consists of three parts which are assembled together to form an operational leak-proof unit.
  • The insulator
  • Electrode
  • A threaded metal shell
Characteristics of Spark Plug
  • The spark plug indicates the conditions of the engine.
  • During operation, the plug must be hot enough to prevent fouling and cool enough to prevent pre-ignition and rapid erosion of the electrodes.
  • Spark plug by itself does not create heat, instead it removes heat. It works as a heat exchanger
Functions of Spark Plug
The spark plug does two primary functions
  • Ignite the air-fuel mixture.
  • Transfer heat from the combustion chamber.
  • Sparks turn fuel into working energy with the help of the electrical energy it carries.
A sufficient amount of voltage must be supplied by the ignition system to spark across the spark plug's gap. This is called "Electrical Performance."

Maintenance of Spark Plug
  • Basically, spark plugs should be checked every 10,000 miles.
  • Use a steel brush to clean rust and carbon.
  • Spark plugs should be washed properly in a solvent and dry with compressed air.
  • The insulator of paint, carbon and oxide that forms from fuel additives should be cleaned thoroughly.
  • The electrode should be filed flat.
  • The cylinder head threads and plug threads should be cleaned thoroughly.
  • Be sure the spark plug cable fits the plug terminal snugly.


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