Testing Air Tightness; Injectors; Injector Checking And Setting - Kohler KD 477-2 Workshop Manual

XI
INJECTION EQUIPMENT
40
41
42
43
- 28 -

Testing air tightness

Feed pressurized air at 6 kg/cm² into the fuel sullpy union and com-
pletely immerse the pump in oil or diesel fuel for about 20 ÷ 30 secon-
ds (fig.40); check that no air bubbles are released.
N.B.: Tightness can be checked by compressing the springs to
52.8 ÷ 54.4 mm, which corresponds to the bottom dead centre wor-
king position of the pump.
Injectors (fig. 41)
1.Body - 2.Nozzle - 3.Ring nut - 4.Plate - 5.Rod - 6.Spring -
7.Adjustment shim.

Injector checking and setting

1. Clean out nozzle holes with a thin piece of wire (fig. 42) of the
same size as that of the nozzle holes indicated on the table:
Engine
KD477-2
2. Set up injector on a test bench (tool cod. 00365R0430).
3. Unscrew injector lock coupling (No 3 fig. 41) or nozzle ring nut and
insert adjustment shim (7, fig. 41) until the pressure indicated in
the table hereunder is reached on the pressure gauge while pum-
ping.
Engine
KD477-2
4. Tighten the nozzle ring nut (No 3 fig. 41) at:
5. When setting is complete, while still at the test bench, run pum-
ping elements a few times and check the amount of diesel that
passes through the upper leak-off of the injector (fig. 43).
KD 477-2 Workshop Manual_cod. ED0053029370_1° ed_ rev. 00
Ø holes mm
0,25
Setting kg/cm
225 ÷ 235
5 kgm (49 Nm)
2