Following components is not part of Spark Ignition (SI) engine:

This question was previously asked in
RRB ALP Mechanic Diesel 21 Jan 2019 Official Paper (Shift 1)
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  1. Glow plug
  2. Inlet and exhaust valve
  3. Intake manifold
  4. Gudgeon pin

Answer (Detailed Solution Below)

Option 1 : Glow plug
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Detailed Solution

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Explanation:
Glow plug:
  • A heater plug or glow plug is used in a diesel engine having a pre-combustion chamber for igniting the diesel fuel spray.
  • This arrangement makes for an easy starting of a diesel engine in cold weather.
  • Most diesel engines use heater plugs.
  • The glow plug consists of a heating element (glowing coil) and is provided with an insulator shell and other parts.
  • In a multi-cylinder engine the number of glow plugs depends on the number of cylinders.
  • They are connected in series, parallel with the battery, through a glow plug switch, (control switch) a resistor, and a red indicator light, and they are provided on the dashboard (panel) of the vehicle.
  • The glow control switch is a three-way one, connecting to the starter also for starting purposes.
  • The glow control switch serves to connect and disconnect the battery with the glow plug as and when required.
  • The red indicator light indicates to the driver, the working of the glow plug or its failure.
The following are the main parts of the Spark Ignition Engine
  • Cylinder
  • Piston
  • Piston Rod
  • Connecting Rod
  • Spark Plug
  • Valves
  • crankshaft
  • Intake manifold
  • Exhaust manifold
  • Gudgeon pin
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