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Chapter 8 FUEL SYSTEM
2.4 Fuel Injection Nozzle - Inspect and Adjust
2.4.1 Fuel Injection Start Pressure - Inspect and
Adjust
Never touch fuel spray during fuel injection nozzle
test.
(Screw adjust type)
(1) Install the fuel injection nozzle to the nozzle tester.
(2) Push down the handle at a speed of one stroke a second
and measure the pressure when injection starts. If the
pressure is out of the standard, adjust it to the standard.
(3) To adjust the injection start pressure, remove the set
screw on the nozzle holder and the cap nut, and turn the
adjusting screw with a screwdriver.
(4) After adjustment, tighten the cap nut and set screw to
the specified torque.
(5) After tightening the set screw, inspect the injection start
pressure again to make sure it is within the standard
value.
Item
Nominal value
21.6 MPa
Fuel injection start-
{220 kgf/cm
ing pressure
[3129 psi]
(Shim adjust type)
(1) Install the fuel injection nozzle to the nozzle tester.
(2) Push down the handle at a speed of one stroke a second
and measure the pressure when injection starts. If the
pressure is out of the standard, adjust it to the standard.
(3) Adjust the injection start pressure by increasing or
decreasing the number of shims. Shims are available in
5 thicknesses from 0.40 to 0.70 mm [0.0157 to 0.0275
in]. Valve opening pressure difference of 0.1 MPa can
be achieved by using a shim having a thickness of
approximately 0.0045 to 0.0083 mm [0.0002 to 0.0003
in.].
(4) After the adjustment, tighten the retaining nut to the
specified torque.
(5) After tightening the retaining nut to the specified
torque, inspect again the injection start pressure to see
that it is as specified.
Item
Nominal value
29.4 MPa
Fuel injection start-
{300 kgf/cm
ing pressure
[4267 psi]
8-20
Standard value
22.1 to 22.6 MPa
2
}
{225 to 230 kgf/cm
2
}
[3200 to 3271 psi]
Standard value
29.9 to 30.7 MPa
2
}
{304 to 313 kgf/cm
2
}
(the value when it is new)
Nozzle tester
P/N:04239-00050
Fuel Injection Start Pressure - Inspect
44 ± 5 N·m
{4.5 ± 0.5 kgf·m}
[33.2 ± 3.7 lbf·ft]
Cap nut
Pressure
- increase
Fuel Injection Start Pressure - Adjust
Pressure adjustment
by shim combinations
68.5 ± ± 9.5 N
68.5 ± 9.5 N·m
68.5
9.5 N·m
·m
{7 {7 ± 1
{7 ± 1 kgf·m}
± 1 kgf
kgf·m}
·m}
[50.5 ± 7.01 lbf·ft]
[50.5 ± 7.01 lbf·ft]
[50.5 ± 7.01 lbf·ft]
Valve Opening Pressure of Fuel Injection Nozzle -
Adjust
Pressure
- decrease
Adjusting screw
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