49
Injectors
The job of the injectors is to atomize and spray the fuel,
metered precisely by the injection pump, into the en-
gine’s combustion chambers. This injection takes place
under extremely high pressure so that atomization and
combustion of the fuel takes place as effectively as pos-
sible.
Each injector basically comprises a nozzle holder and a
nozzle (jet). When the fuel pressure increases to a set
value (opening pressure), the nozzle needle (10), which
is pressed in its seat by the pressure spring (5), is
raised, and atomized fuel is sprayed into the engine
through carefully calibrated holes in the nozzle body.
The tension of the pressure spring determines the
opening pressure of the injector.
The injectors should be checked regularly by authorized
personnel, refer to maintenenance chart. An incorrect
opening pressure or faulty nozzle will result in smoky
exhaust gases and lower engine output.
Injectors
1. Injector mounting
2. Hollow screw
3. Gasket
4. Adjustment shim
5. Spring
6. Thrust pin
7. Guide pin
8. Guide
9. Guide pin
10. Nozzle needle
11. Jet
12. Jet nut
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