FUEL SYSTEM
8-10
2.1.2 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.
Checking fuel spray pattern from fuel injection nozzle
2.1.3 Cleaning and replacing faulty nozzle
&$87,21
When pulling out the nozzle tip, be careful not to dam-
age the tip.
(1) Loosen the retaining nut, then remove the nozzle tip,
and clean the needle valve and body.
(2) Clean the nozzle tip in clean wash oil. After cleaning,
assemble the needle valve and body in clean diesel fuel.
Note: The needle valve and body are precision parts.
Handle them carefully, and do not change the
combination of the valve and body.
(3) Tighten the nozzle tip retaining nut to the specified
torque.
(4) If the spray pattern is still faulty after cleaning and
adjusting, replace the nozzle tip.
Note: When using a new nozzle tip, remove the anti-
corrosive agent from the nozzle tip, and clean the
nozzle tip in wash oil. Then clean the tip again in the
fuel before assembly.
Cleaning nozzle tip assembly
Good
Large
spray
angle
After
dribble
Branched
spray
Deflected
spray
Defective spray pattern
Needle
valve
Body
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