Isuzu AU-4LE1T, Maintenance Manual

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6. ENGINE ASSEMBLY AND OTHERS
To continue trouble free engine operation over a long period of time, the
servicing items need a skilled maintenance technician, therefore, consult
your machine supply source on the following items when necessary.
(1) Fuel Injection Nozzle
Use an injection nozzle tester to check the static injection starting
pressure and the fuel spray conditions.
Injection nozzle pressure test interval : Every 500 operation hours
When the injection starting pressure is too high or too low or the fuel
spray pattern is improper, an abnormal fuel combustion take place in
the engine leading a lowered output and blackish exhaust smoke.
Further, it causes a piston seizure or piston damage etc. In such cases,
contact ISUZU dealer or Bosch dealer to adjust the injection starting
pressure or replace the nozzle.
Injection starting pressure
Refer to the Engine Family Index.
WARNING: While using a nozzle tester, it may happen that high pressure
blow off the fuel oil and injure the worker. Keep off the nozzle
end.
Good No good
IMLE0071