FUEL SYSTEM
8-9
2.1.1 Inspecting and adjusting fuel injection
valve opening pressure
&$87,21
Never touch the injection nozzle tip during nozzle
injection test.
(1) Mount the nozzle on the nozzle tester.
(2) Push down the handle at a speed of once a second and
read the pressure when injection starts. Make
adjustment if it is outside the standard.
(3) To adjust the injection start pressure, remove the set
screw on the nozzle holder, loosen the cap nut and turn
the adjusting screw with a driver.
(4) After adjustment, tighten the cap nut and set screw with
the specified torque.
(5) After tightening the set screw, check if the injection
start pressure is within the standard again.
Note: Change in washer thickness by 0.1 mm [0.004 in.]
results in a pressure change of 1.0 MPa {10 kgf/cm²}
[142 psi]. Washers are available in 10 different
thicknesses at intervals of 0.05 mm [0.0020 in.] in
the range between 1.25 and 1.70 mm [0.0492 and
0.0669 in.].
Checking valve opening pressure
Replacing fuel injection nozzle tips
Item Standard
Valve opening pressure
13.73 to 14.73 MPa
{140 to 150 kgf/cm²}
[1992 to 2134 psi]
Nozzle tester
Nozzle tip end
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