Table of Contents
Advertisement
46
47
48
49
25 LD 330-2_425-2 Workshop Manual_cod. ED0053031690_1° ed_ rev. 00
Injection equipment
Injectors
Details of fig.46:
1.Injector casing
2.Adjusting shim
3.Spring
4.Rod
5.Distance ring with locating pin
6.Nozzle
7.Ring nut
Checking and setting the injectors
1. Clean the nozzle holes with 0.25 mm gauge steel wire
(fig.47).
2. Place the injector on the test bench (p.n. 00365R0430,
fig.48) bypass the pressure gauge and operate the lever
rapidly. The nozzle should chatter audibly and spray
correctly.
3. Connect the pressure gauge while pressing the lever slowly
and steadily until injection occurs.
The opening pressure registered on the gauge should be
230 Kg/cm² (200 Kg/cm² on silenced versions).
Change the adjusting shims (nr. 2, fig. 46) in order to
achieve correct adjustment.
4. Testing fortightness: Operate test bench hand lever until
the pressure gauge reads 20 Kg/cm² below the opening
pressure of the needle valve. The nozzle can be considered
well sealed if there no Diesel fuel accumulates at the nozzle
tip after 10 seconds.
Disassembly and re-assembly of injectors
Unscrew the ring nut on the injector nozzle using a ring wrench
and a special tool as illustrated in figure 49 serving to release
the pressure exerted by the spring on the ring nut.
1. Visual check: make sure that the seat of the needle shows
no signs of hammering or excess roughness, that the needle
is not worn or damaged, and that the holes are free of
carbon deposits.
2. Smoothness test: the needle, previously immersed in diesel
and inserted into the nozzle casing, must be pulled out to a
third of the length of the guide while holding the nozzle in
a vertical position. When the needle is released it should
return freely to its seat by the effect of its own weight.
Reassemble the injector following the assembly order shown
in figure 46; during reassembly make sure that the locating
elements on distance ring 5 (fig.46) are correctly inserted to the
corresponding holes. Torque the nozzle securing ring nut to:
kgm 3,5 (Nm 34,3)
5
- 35 -
Advertisement
Table of Contents
