Leakage Test; Spray Pattern Test; Adjusting Shim Thickness - Toyota 1PZ Repair Manual

FUEL SYSTEM - Injection Nozzles (1 PZ and 1 HZ)
Good Faulty
Good Faulty
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
HINT:
• Varying the adjusting shim thickness by 0.025 mm
(0.0010 in.) changes the injection pressure by about 4.5
2
kg/cm
• Varying the adjusting shim thickness by 0.025 mm
(0.0010 in.) changes the injection pressure by about 3.5
2
kg/cm
• Only one adjusting shim should be used.
(f) There should be no dripping after injection.
2.

LEAKAGE TEST

While maintaining pressure at about 1 0 - 2 0 kg/cm
(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.
FU1347
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.
FU1481
(1,920-2.205 psi)
(13,239-15,200 kPa)
(64 psi, 441 kPa) (1PZ).
(50 psi, 343 kPa) (1HZ).
FU-11
2
2