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

ENGINE 275.950 in MODEL 215, 220

ENGINE 275.951 in MODEL 230

ENGINE 275.953 in MODEL 216, 221

ENGINE 275.954 in MODEL 230

ENGINE 275.980 in MODEL 215, 220

ENGINE 275.981 in MODEL 230

ENGINE 275.982 in MODEL 216, 221

ENGINE 285.950 in MODEL 240

ENGINE 285.980 in MODEL 240

Fig 1: Identifying Spark Plug

Courtesy of MERCEDES-BENZ USA

	Spark plugs, location	Two spark plugs per cylinder are fitted in the cylinder head
	Spark plugs, task	Ignite the compressed fuel-air mixture through sparks between the electrodes according to actuation of the ECI ignition system. Detects the ion current.
	Spark plugs, design	In the manufacturer's specific type symbols, all spark plug features are assigned (e. g. heat rating, shape of seating, thread, width across flats, electrode material, spark position).
	Spark plugs, function	The ignition voltage flows from the directly-inserted ignition coils in the ECI ignition modules (N92/1, N92/2) to the spark plugs and causes arcing in the gap between the central electrode and ground electrode.