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Spark plugs, location/task/design/function - GF15.10-P-3101AM

ENGINE 113.990 /991 /993 

ENGINE 113.992 /995 up to Model Year 8 

Fig 1: Identifying Spark Plug
G07871143Courtesy of MERCEDES-BENZ USA
  Spark plugs, location Two spark plugs per cylinder are fitted in the cylinder head  
  Spark plugs, task The spark plugs ignite the suctioned and compressed fuel-air mixture due to arcing between the electrodes.  
  Spark plugs, design All of the spark plug features are assigned in the manufacturer's specific type symbol (e. g. heat rating, shape of seating, thread, width across flats, electrode material, spark position).  
  Spark plugs, function The ignition voltages flow from the ignition lines of the ignition coils to the spark plugs and cause arcing in the air gap between the central electrode and ground electrode.