PREGLOW System

The pencil element glow plugs are comprised of a housing with screw-in threads. A heater bar is also pressed into the housing. The single-pole connecting bolt is screwed to housing by means of a non-releasable round brass nut. The pencil element glow plugs are designed for a voltage of 11.5 volts and are operated as a parallel circuit.

The heating element consists of a heating and control winding connected in series. When the glow system is switched on, a current of approximately 30 amps will flow to each glow plug.

The winding increases its resistance with increasing temperature and limits the current to approximately 8-15 amps. This will protect the glow plug against overload. After a glow time of 9 seconds, a heater bar temperature of approximately 1500°F (900°C) will be attained.