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Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
FUEL INJECTION NOZZLE
ENGLISH
FUEL SYSTEM
39.1.2 Orifice restriction test
1. Look at the orifice discharge pattern (shape of
discharge) when fluid begins to flow through the
injection nozzle. The discharge must be straight.
Any change is an indication of a bad nozzle.
2. Operate the tester handle at a speed of one stroke
per second to make sure the discharge is straight.
39.1.3 Nozzle tip washing and replacement
1. Loosen the retaining nut and remove the tip from
the injection nozzle. Wash the needle valve and
body in clean diesel fuel. After washing, put the
needle valve in the body in clean diesel fuel.
2. After cleaning the tip, install it in the nozzle and
tighten the retaining nut to the specified torque.
3. If the injection nozzle is still bad after the tip has
been washed, replace the tip.
Figure 217 Orifice restriction test
Good nozzle
Discharge pattern for orifice with a
restriction (recondition or replace)
Figure 218 Washing nozzle tip
Needle valve
Body
CAUTION
Do not hit the tip when removing it from the injection
nozzle.
NOTE
Keep the need valves with their respective bodies.
Do not use needle valves or bodies with other bodies
or needle valves.
Tightening torque
3.75 ± 0.25 kgf·m
(27 ± 1.8 lbf·ft)
[36.8 ± 2.5 N·m]
NOTE
a. Do not touch the sliding surface of the needle
valve.
b. When installing the new nozzle tip, remove
synthetic resin film from the tip and slide the
needle valve in the body in clean diesel fuel to
wash off inhibitor completely.
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