Testing - Mitsubishi S4Q User Manual

FUEL INJECTION NOZZLES
Figure 170 Testing fuel injection nozzle
Figure 171 Removing nozzle tip
102 / 174

21.2 Testing

1. Injection pressure (valve opening pressure)
1) Install the injection nozzle on the tester. Slowly
operate the tester handle full strokes to bleed
(remove) air from the pipe and nozzle.
2) Make a slow increase in pressure by
operating the tester handle at a speed of more
than one stroke per second while observing
the pressure gage.
3) The pressure gage reading will slowly
increase and, when the nozzle starts
discharging fuel, it will go down fast. Take the
gage reading right then as the injection
pressure.
Item
Injection pressure
CAUTION
When testing the injection nozzle, keep its tip pointed
away from the operator. Fuel from the orifices in the
tip of the nozzle is under high pressure and can
cause injury to the operator.
4) If the injection pressure is not correct, make
an adjustment of the nozzle by adding or
removing the shims inside the nozzle holder.
ENGLISH Service Manual Mitsubishi SQ-Series diesel engines
FUEL SYSTEM
2
Unit: MPa (kgf/cm ) [psi]
Assembly Standard
+0.78
14.22
0
+8
(145 )
0
+113
[2063 ]
0
Version 08/2004