FUEL SYSTEM
8-6
2.1.2 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.
Inspecting fuel injection valve opening pressure
Replacing fuel injection nozzle tips
2.1.3 Inspecting fuel spray pattern of fuel injec-
tion nozzle
(1) When adjusting the nozzle opening pressure using the
nozzle tester, check for nozzle hole condition, and fuel
spray pattern.
(2) Checking points of fuel spray are as follows:
· Fuel is injected from all spray holes simultaneously.
· Fuel is injected conically at the specified spray angle.
· Fuel is injected in a spray of fine droplets.
· Fuel is injected without after-dribbling.
(3) If spray condition is faulty, clean or replace the nozzle
tip.
Inspecting fuel spray pattern from fuel injection nozzle
Item Nominal Standard
Valve opening
pressure
13.73 MPa
{140 kgf/cm²}
[1991 psi]
14.22 to 15.00 MPa
{145 to 153 kgf/cm²}
[2062 to 2176 psi]
(New parts value)
Nozzle tester
Nozzle tip end
Good
Large
spray
angle
After
dribble
Branched
spray
Deflected
spray
Defective spray pattern
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