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5.6. Injection Nozzle Maintenance
(by authorized specialist personnel)
The injectors are designed to spray the
fuel delivered by the injection pump direct-
ly into the spherical combustion chamber
in the piston crown.
The injector consists of the nozzle and the
nozzle holder.
A copper seal fitted to the injector ensures
gas-t
ight seating and good he
at dissipation.
The opening pressure of the nozzle is
adjusted by means of shims at the com-
pression spring.
•
Install a nozzle to a nozzle tester.
•
Check injection pressure, and adjust the nozzle using the adjusting shim if the pressure does not
meet the specified limit.
•
Check nozzle spray patterns and replace if damaged.
CAUTION :
The injection lines are designed for high operating pressures and should thus be handled with
particular care.
•
When mounting the pipes to the engine take care of good fitness.
•
Do not bend pipes to permanent deformation (not for replacing the nozzles either).
•
Do not mount any heavily bent pipes.
•
Avoid bending the pipes at the ends by more than 2 to 3 degrees.
In case of faults in the injection system which might have resulted in excessive operating pres-
sures, not only the failed part but also the injection line has to be replaced.
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