FUEL SYSTEM - Injection Nozzles (1 PZ and 1 HZ)
FU-11
HINT: Proper nozzle operation can be determined by a
swishing sound.
If the opening pressure is not as specified, disassemble he
nozzle holder and change the adjusting shim on the top of
the pressure spring. (See page FU-13).
Adjusted opening pressure: 135- 155 kg/cm
2
(1,920-2.205 psi)
(13,239-15,200 kPa)
Good Faulty
FU1347
Good Faulty
FU1481
HINT:
• Varying the adjusting shim thickness by 0.025 mm
(0.0010 in.) changes the injection pressure by about 4.5
kg/cm
2
(64 psi, 441 kPa) (1PZ).
• Varying the adjusting shim thickness by 0.025 mm
(0.0010 in.) changes the injection pressure by about 3.5
kg/cm
2
(50 psi, 343 kPa) (1HZ).
• Only one adjusting shim should be used.
(f) There should be no dripping after injection.
2. LEAKAGE TEST
While maintaining pressure at about 10-20 kg/cm
2
(142-284 psi, 981 -1,961 kPa) below 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.
3. 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 replaced or cleaned.
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