Glow Plug; Key Stop Solenoid - wsm B2420 Workshop Manual

B2420, WSM

[5] GLOW PLUG

[6] KEY STOP SOLENOID

This plug is a two-material type QGS (Quick Glow
System) for quick
self-controlling function as well as excellent durability.
The heater (4) connected in series to the heater (3),
which also functions as the resistor, is incorporated in
the sheath tube (1) of the super glow plug.
The resistance of this heater (3) cum resistor is small
when the temperature is low, while the resistance
becomes large when the temperature rises.
Therefore, because sufficient current is flown to the
heater (4) during the initial period of energization, the
temperature rises quickly and the resistance grows with
the rise in the temperature of the resistor, the flowing
current is reduces to prevent the heater (4) from being
heated.
The ignition point is in the area of 2 to 3 mm (0.079
to 0.118 in.) from the tip of the plug in order to reduce its
projection into the combustion chamber.
(1) Sheath Tube
(2) Insulation Powder
(3) Heater also functioning as a
Resistor
(4) Heater
(5) Super Glow Plug
(6) Conventional Quick-heating
type Glow Plug
(7) Glow Plug Current
Flowing of the battery current into the key stop
solenoid, the plunger (2) move to left side so that the
movement of control rack (4) becomes free. When the
battery current stops, the plunger (2) is returned to the
original position by the spring to keep the control rack (4)
in "No fuel injection" position.
(1) Key Stop Solenoid
(2) Plunger
9-M11
ELECTRICAL SYSTEM
temperature rise, and
(a) Glow Plug Temperature
(°C)
(b) Current (A)
(c) Time (Sec.)
9Y1210436ELM0005US0
(3) Injection Pump
(4) Control Rack
9Y1210436ELM0006US0
KiSC issued 06, 2012 A
has