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Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
ENGLISH
FUEL INJECTION NOZZLE FUEL SYSTEM
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FUEL SYSTEM
39 FUEL INJECTION
NOZZLE
39.1 Inspection
39.1.1 Injection pressure (valve opening
pressure) test
1. Install the injection nozzle on the tester. Slowly
operate the tester handle to bleed (remove) air
from the tester.
2. Operate the tester handle at a speed of one stroke
per second to make a slow increase in pressure
until the valve in the injection nozzle starts to open.
Read the maximum gauge pressure at the instant
fluid flows from the tip.
3. If the injection pressure is incorrect, disassemble
the nozzle and change the thickness of the
washer.
Figure 215 Fuel injection nozzle ready for test
Figure 216 Removing tip from injection nozzle
Injection pressure (valve
opening pressure) Standard
140
0
+5
kgf/cm
2
(1991
0
+71
psi)
[13729
0
+490
kPa]
NOTE
An increase or decrease of washer thickness by 0.1
mm (0.004 in.) will vary the injection pressure by 10
kgf/cm
2
(142 psi) [981 kPa]. 10 kinds of washer are
available in thicknesses from 1.25 mm (0.049 2 in.) to
1.70 mm (0.066 9 in.) in increments of 0.05 mm
(0.002 0 in.).
îîWARNING
When the injection nozzles are tested, be sure to
wear eye protection. Fuel comes from the orifices in
the nozzle tip with high pressure. The fuel can pierce
(go through) the skin and cause serious injury to the
operator. Keep the tip of the nozzle pointed away
from the operator and into the fuel collector.
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