Kohler KD 500 워크샵 매뉴얼 - 페이지 27

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Kohler KD 500 워크샵 매뉴얼
36
37
38
39
Workshop Manual KD500 _ cod. ED0053029390 - 1° ed_rev. 00
5. Insert the adjuster sleeve unit and plunger (L) into the pump
casing (A), making sure that the helical profile is directed on a
level with the return union with ball.
6. Fit in the adjuster block (M), matching the reference marks
applied during the demounting phase.
7. Tighten the plug (N) to a 0.5 to 0.6 Nm torque, locking it in
place with Loctite 290.
8. Insert the spring (O) and lower cap (P).
9. Compress the tappets in the various operating positions to
check that the adjuster sleeve (L) slides perfectly. Resistance
or jamming will make the engine to hunt during operation.

Leak test

Plug the fuel return union and let air in through the fuelling
union at a pressure of 6 Kg/cm². Fully immerse the pump in a
receptacle containing diesel fuel for about 50 - 60 seconds (fig.
37) and make sure that no bubbles appear.
NOTE: the position of the pump adjuster sleeve is of no
importance for this test.
Injector
Details of fig. 38:
1. Filter - 2. Fuel inlet union - 3. Fuel return union - 4. Nozzle
holder - 5. Calibration washer - 6. Spring - 7. Pressure rod - 8.
Spacer - 9. Nozzle - 10. Ring nut.

Injector inspection and calibration

1. Clean the nozzle holes with a thin steel wire (fig. 39) with the
following diameters:
Diameter of steel
wire (mm)
0,24
2. Mount the injector on the test bench (code 00365R0430, fig.
40).
Disconnect the pressure gauge and rapidly operate the lever.
The nozzle must make the characteristic "trilling" sound and
inject with a good atomizing action.
3. Connect the pressure gauge. Slowly depress the level in a
continuous way until injection occurs.
The injector needle must "open" at the pressure of 230 to 238
bar. Vary the washer shims (N° 5 fig. 38) to calibrate in the
correct way.
4. Leak test: operate the test bench lever until the gauge pointer
is 20 Kg/cm² below the injection pressure value. Nozzle
tightness is good if no fuel comes out within 10 sec.
5. Checking for leaks on the nozzle return phase: operate the
test bench lever until the gauge pointer is 20 Kg/cm² below
the injection pressure value. Release the lever and
Injection equipment
Number
Diameter
of holes
of holes (mm)
5
0,25
11
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