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6.3.8 Calibrating the injector
To carry out setting, the injector pump must be
disassembled from the engine.
Per conoscere la procedura corretta, vedi "Smontaggio
pompe-iniettori".
1. Remove the non-return valve (A) and replace it with the
plug supplied with the "7107-1460-074" tool.
2. Mount the tool head (B) and fasten with the screws.
3. Connect the pump for calibrating the diesel injectors to
the head union.
4. Press the pump and bring to a pressure of 130 bars for
10 sec, in order to check the needle seal. Replace
the nozzle (see "Nozzle-injector replacement") if
there is any dripping.
5. Press the pump again and check to see whether the
fuel comes out at a pressure of 140-155 bars
(optimal operating calibration).
6. If calibration is not optimal, it is possible to modify
the action of spring, using the adjustment shims.
The adjustment shims are available in 11 sizes
between 1mm and 2mm, uprated at 0.1mm gaps.
If after inserting the largest adjustment shim (2mm)
optimal calibration is still not achieved, the spring
(see "Nozzle-injector replacement") must be
replaced.
6.3.9 Checking and overhauling the speed governor
Disassemble the speed governor before checking or
overhauling.
See "Disassembling the speed governor and flow limiter"
for the correct procedure.
Exploded diagram of the speed governor
Caption
1) Oil seal
2) Screw
3) Cover
4) O-ring
5) Ball bearing
6) Plate
7) Screw
8) Weighted support
9) Spacing collar
10) Fith wheel coupling
11) Nut
12) Idle spring
13) Maximum speed ring
14) Barrel
15) Thrust washer
16) Stop ring
17) Pivot
18) Leverage assembly
19) Clearance ring
20) Hose (in some versions)
74
Service Manual LDW FOCS 502 automotive _ cod. ED0053027270 - 3° ed_rev. 02
OVERHAULS AND TUNING
73
7. After replacing the spring, calibrate at 10 bars higher than the
optimal operating calibration of 140-155 bars. When the
spring settles, the calibration will level at the optimal value.
8. Remove the tool "7107-1460-074".
9. Replace the non-return valve.
10. Assemble the injection-pump on the engine (see "Assemble
injection –pumps").
1. Use a gauge to make sure that the distance (A) is between 45
and 46 mm.
2. Make sure that the contact surfaces (B) are perfectly
level with a deviation of no more than 0.05 mm.
If the deviation is greater than this, replace the speed
governor with an original spare.
Pump
A
Union
B
6
A
B
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