Fuel Injectors - New Holland FX25 Repair Manual

FUEL INJECTORS

Fuel injector components
1. Exhaust union
2. Washers
3. Casing
4. Washers
5. Union
6. Adjust washer
7. Spring
8. Cap
9. Spacer
10. Nozzle
11. Retaining nut
Injectors consists of a nozzle holder and a nozzle.
The injector function is to admit atomised fuel under
pressure into the combustion chamber.
NOTE: The injectors are the same as used on the
TX68 and TF78 combines but the calibration pres-
sure is different!
Bench test and calibration
To calibrate an injector means to give its spring such
a load that the pressure preset for injection is necess-
ary to lift up the nozzle needle.
Correct calibration pressure is obtained by changing
the adjusting washer 6 (Fig. 3) thickness, so as to
suitably changes spring load 7.
Injector 1 test and calibration are carried out using
tool 2 (Ref. IVECO 99301116). The calibration value
should be 250 bar.
+ 8
-- 0
After calibration, verify the nozzle seal acting on the
pump until the gauge indicates a pressure of 120 bar.
Check that a pressure drop from 120 to 70 bar takes
place in 4" to 20".
Injector mounting bolts torque: 21 Nm.
SECTION 10 - - ENGINE - - CHAPTER 1
51864
51865
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3
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