THEORY OF OPERATION - CONTINUED
FUEL SYSTEM - CONTINUED
Generation of High Pressure.
Fuel flows from fuel transfer pump outlet passage. High pressure is generated by distributor plunger axial
movement. Cam plate is driven by fuel injection pump shaft. Cam plate has six cams, corresponding to
number of engine cylinders. Cams on cam plate run on rollers. Rollers are fixed on cam ring. Rotating and
lifting movement of cam plate generates high pressure.
Cam plate moves distributor plunger
toward distributor head. High pressure is
created by a decrease in volume between
distributor plunger and distributor head.
Cam plate is pressed to ring by two
springs, which brings distributor plunger
back to its original position. Fuel sole-
noid valve closes high pressure volume.
Distribution and Injection.
Fuel distribution to injectors takes place through distributor plunger rotating movement. Fuel solenoid
valve meters amount of fuel by:
(a) Time of closure
(b) Duration time
(c) Start of injection
(d) Amount of fuel