Mitsubishi S12A2 User Manual

8-20
Chapter 8 FUEL SYSTEM
2.4 Fuel Injection Nozzle - Inspect and Adjust
2.4.1 Fuel Injection Start Pressure - Inspect and
Adjust
(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.
Fuel Injection Start Pressure - Inspect
Fuel Injection Start Pressure - Adjust
(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.
Valve Opening Pressure of Fuel Injection Nozzle -
Adjust
Never touch fuel spray during fuel injection nozzle
test.
Item Nominal value Standard value
Fuel injection start-
ing pressure
21.6 MPa
{220 kgf/cm
2
}
[3129 psi]
22.1 to 22.6 MPa
{225 to 230 kgf/cm
2
}
[3200 to 3271 psi]
Nozzle tester
P/N:04239-00050
Cap nut
Adjusting screw
Pressure
- increase
Pressure
- decrease
44 ± 5 N·m
{4.5 ± 0.5 kgf·m}
[33.2 ± 3.7 lbf·ft]
Item Nominal value Standard value
Fuel injection start-
ing pressure
29.4 MPa
{300 kgf/cm
2
}
[4267 psi]
29.9 to 30.7 MPa
{304 to 313 kgf/cm
2
}
(the value when it is new)
Pressure adjustment
by shim combinations
68.5
68.5
±
±
9.5 N
9.5 N
·m
·m
{7
{7
± 1
± 1
kgf
kgf
·m}
·m}
[50.5 ± 7.01 lbf·ft]
[50.5 ± 7.01 lbf·ft]
68.5 ± 9.5 N·m
{7 ± 1 kgf·m}
[50.5 ± 7.01 lbf·ft]

Mitsubishi S12A2 Specifications

General

Brand	Mitsubishi
Model	S12A2
Category	Engine
Language	English