OPERATIONS INSIDE THE ENGINE COMPARTMENT
PERIODIC INSPECTION AND MAINTENANCE
2-20
A17. CHECK INJECTION NOZZLE [IF
DARK SMOKE IS EXHAUSTED OR
ENGINE POWER IS LOW] <4M40>
M6020201800080
FUEL INJECTION INITIAL PRESSURE
CHECK
1. Install the injection nozzle to a nozzle tester.
2. Move the lever of the nozzle tester 2 − 3 times to
inject fuel and to bleed the air.
3. Gently press down the lever of the nozzle tester,
and take a reading of the indication value on the
pressure gauge at the point where the needle
slowly rises and then suddenly drops.
Standard value (Fuel injection initial pres-
sure): 14,710 − 15,690 kPa
4. If the fuel injection initial pressure is outside the
standard value, disassembly the nozzle holder to
clean it, and the change the thickness of the shim
to adjust the fuel injection initial pressure.
NOTE: When the shim thickness is increased by
0.1 mm, the fuel injection initial pressure
increases by approximately 1,177
−
2,157 kPa.
INJECTION SPRAY CONDITION CHECK
1. Move the lever of the nozzle tester rapidly (4 − 6
times per second) to eject the fuel continuously.
Check to be sure that the injection spray comes
out evenly in a cone shape (injection spray comes
out evenly in a cone shape (injection spray angle
is 0
° ). The injection spray patterns shown in the
illustration.
a. Injection angle is tool large
b. Bias
c. Intermittent fuel injection
2. Check to be sure that no fuel drips after injection
is completed.
3. If there are any drips, disassemble the nozzle,
clean it and reinspect, or replace the nozzle.
NOZZLE FUEL-TIGHT CHECK
1. Gently raise the lever of the nozzle tester until the
pressure inside the nozzle (value displayed on
pressure gauge) becomes 12,750
− 13,730 kPa,
and after holding this pressure for approximately
10 seconds, check to be sure that there are no
fuel leaks from the nozzle.
2. If there are any leaks, disassemble the injection
nozzle, clean it and re-inspect, or replace the
nozzle.
AK500622 AB
AK500623 AB
ABC
AK500624
AK500625 AB
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