5.6. Injection Nozzle Maintenance (by authorized specialist personnel)
The injectors are designed to spray the fuel
delivered by the injection pump directly into
the spherical combustion chamber in the pis-
ton crown.
The injector consists of the nozzle and the
nozzle holder.
A copper seal fitted to the injector ensures
gas-tight seating and good heat dissipation.
The opening pressure of the nozzle is adjust-
ed by means of shims at the compression
spring.
¥
Install a nozzle to a nozzle tester.
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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.
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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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