Nanni N4.40, Workshop Manual, Page: 103 / 175

ENGINE
03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
1-S33
Fuel Tightness of Delivery Valve
[D1803-M-DI, V2403-M-DI, V2403-M-DI-T]
1. Remove the solenoid.
2. Remove the injection pipes and glow plugs.
3. Set the injection pump pressure tester to the injection pump.
4. Set the injection nozzle (2) jetted with the correct injection
pressure to the injection pump pressure tester (1).
5. Crank the engine with the starter to increase the pressure.
6. Stop the starter when the fuel jets from the injection nozzle.
Then turn the flywheel manually and increase the pressure to
approx. 18.63 MPa (190.0 kgf/cm
2
, 2702 psi).
7. Turn the flywheel back about half a turn (to keep the plunger
free) and keep the flywheel at this position.
8. Measure the time for the pressure to decrease from 18.63 to
17.65 MPa (190.0 to 180.0 kgf/cm
2
, 2702 to 2560 psi).
9. If the measurement is less than allowable limit, replace the
pump with a new one.
You can also repair the pump at a KUBOTA-authorized pump
service shop.
NOTE
• Do not try to disassemble the injection pump assembly.
Repair the pump at a KUBOTA-authorized pump service
shop.
M00000003ENS0031US1
Fuel tightness of delivery
valve
Factory spec.
10 seconds
18.63
→ 17.65 MPa
190.0 → 180.0 kgf/cm
2
2702 → 2560 psi
Allowable limit
5 seconds
18.63
→ 17.65 MPa
190.0 → 180.0 kgf/cm
2
2702 → 2560 psi
(1) Injection Pump Pressure Tester
(2) Injection Nozzle (3) Protection Cover for Jetted Fuel
KiSC issued 06, 2009 A