New Holland 667TA/EBF, Repair Manual

Page: 70 / 150

2-52
Issued 11-06 Bur 87519804 NA
CHAPTER 2 - 667TA ENGINE OVERHAUL
ENGINE REPAIR MANUAL
ELECTRO-INJECTOR
BS06K068 Figure 2-67
INJECTOR IN REST POSITION
The injector is similar to the conventional injectors,
except for the absence of plunger return springs.
The injector can be considered in terms of two basic
parts:
•
Actuator- spray nozzle composed of pressure rod
(1), plunger (2) and nozzle (3).
•
Control solenoid valve composed of coil (4) and
pilot valve (5).
The solenoid valve controls spray nozzle plunger lift.
BS06K069 Figure 2-68
INJECTION START
When coil (4) is energized, it makes ball shutter (6)
move upwards. The control volume (9) fuel flows
towards control fuel outlet (12) making a pressure
drop occur in control volume (9). Simultaneously the
fuel pressure into pressure chamber (8) makes
plunger (2) lift, causing injection of fuel into the
cylinder.
INJECTION END
When coil (4) is de-energized, shutter ball (6) goes
back to its closed position to restore a balance of
forces to make plunger (2) go back to its closed
position and end the injection cycle.
IMPORTANT: The injector has no serviceable parts
inside, so it is not repairable.
1. PRESSURE ROD 9. CONTROL VOLUME
2. PLUNGER 10. CONTROL DUCT
3. NOZZLE 11. SUPPLY DUCT
4. COIL 12. CONTROL FUEL OUTLET
5. PILOT VALVE 13. ELECTRIC CONNECTION
6. BALL SHUTTER 14. SPRING
7. CONTROL AREA
15. HIGH PRESSURE FUEL
INLET
8. PRESSURE CHAMBER
6
1
11
12
15
4
13
2
3
8
14
9
10
7
5
6
1
11
12
15
4
13
2
3
8
14
9
10
7
5