Takeuchi TB 175 Handbuch Seite 756

(5) Fuel injection nozzle pressure inspection
Wear protective glasses when testing injection from the fuel injection valve. Never approach the injection
nozzle portion with a hand. The oil jetting out from the nozzle is at a high pressure to cause loss of sight or
injury if coming into careless contact with it.
(a)Injection pressure measurement
Model
3TNV82A to TNV88 (CL)
3TNV82A to TNV88 (VM)
4TNV94L4 to TNV106(T)
[NOTICE]
As for the opening pressure of the brand-new fuel
nozzle, about 0.5 Mpa (5 kgf/cm) declines by the
engine operation for about 5 hours because of the
initial wear-out of a spring etc. Therefore, adjust
0.5 MPa (5 kgf/cm) higher than the standard value of
the above table when adjusting a new fuel nozzle of a
spare part.
Remove carbon deposit at the nozzle hole thoroughly
before measurement.
1)Connect the fuel injection valve to the high pressure
pipe of the nozzle tester.
2)Operate the nozzle tester lever slowly and read the
pressure at the moment when the fuel injection from
the nozzle starts.
3)If the measured injection pressure is lower than the
standard level, replace the pressure adjusting shim
with a thicker one.
Thickness of pressure adjusting shims
0.13, 0.15, 0.18, 0.4, 0.5, 0.8
Standard
2
MPa (kgf/cm )
19.6-20.6
(200-210)
21.6-22.6
(220-230)
mm
The injection pressure is increased by approx. l.9 MPa (l9 kgf/cm
when the adjusting shim thickness is increased by 0.l mm.
43
2. Inspection and adjustment
Injection nozzle
Injection pressure measurement
with nozzle tester
Injection pressure adjustment
Nozzle tester
2
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