Perkins 1104E Systems Operation Testing And Adjusting page 19

SENR9977
Illustration 19
Timing advance for timing mechanism (side view and top view)
Illustration 20
Timing retard for timing mechanism (side view and top view)
The timing advance or the timing retard of the fuel
injection pump is shown in the following steps:
1. The ECU sends a signal to the timing solenoid
valve.
2. The timing mechanism is triggered by the timing
solenoid valve.
3. The timing solenoid valve changes the pressure in
the timing mechanism.
4. The timing mechanism changes the position of
the cam ring.
5. The cam ring changes the position of the rollers.
6. The rollers change the position of the cam plate.
7. The cam plate changes the timing of the fuel
delivery.
Control
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Illustration 21
Electronic control for the fuel system (typical example)
The ECU for the injection pump uses the command
from the ECM and the measured values from the
speed/timing sensor to actuate the fuel solenoid
valve.
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Systems Operation Section
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