FUEL SYSTEM - Injection Nozzles (1 HD-T) FU-17
4. REMOVE INJECTION NOZZLES
(a) Remove the bolt, washer, nozzle holder clamp, injec-
tion nozzle and seat.
(b) Remove the O-ring from the injection nozzle.
HINT: Arrange the injection nozzles in correct order.
TEST OF INJECTION NOZZLES
1. LEAKAGE TEST
While maintaining pressure at about 10-20 kg/cm
2
(142-284 psi, 981-1,961 kPa) below No.1 opening
pressure (adjust by tester handle), check that there is no
dripping for 10 seconds from the injection hole or around
the retaining nut.
If the nozzle drips within 10 seconds, replace or clean and
overhaul the nozzle assembly.
2. SPRAY PATTERN TEST
(a) The injection nozzle should shudder at a certain
pumping speed between 15 - 60 times (old nozzle) or
30-60 times (new nozzle) per minute.
(b) Check the spray pattern during shuddering.
If the spray pattern is not correct during shuddering, the
nozzle must be clean or replaced.
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