A. General
Operation of Preglow SystemA. General
On a diesel engine, combustion is effected by self- ignition of the fuel sprayed into the highly compressed and thereby highly heated combustion air.
In a cold engine, the self-ignition temperature is not attained by compression alone. A preglow system is therefore required, which serves the purpose of increasing the temperature of the compressed air to facilitate starting of the cold engine by the inflammation of fuel particles on filament of glow plug.
The duration of preglowing (preheating) depends on temperature of engine and on ambient temperature.