Nanni N4.40 Workshop Manual page 105

03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
Fuel Injection Pressure
[D1803-M-DI, V2403-M-DI, V2403-M-DI-T]
1. Set the injection nozzle to a nozzle tester.
2. Slowly move the tester lever to measure the pressure at which
the fuel start to jet out from the nozzle.
3. If the measurement is out of the factory specifications, replace
the injection nozzle assembly.
Fuel injection pressure
Factory spec.
(1st stage)
Valve Seat Tightness
[D1503-M, D1703-M, D1803-M, V2003-M, V2203-M, V2403-M,
V2403-M-T, D1703-M-BG,
V2203-M-BG, V2403-M-BG]
1. Set the injection nozzle to a nozzle tester.
2. Increase the fuel pressure, and keep it at 12.75 MPa
2
(130.0 kgf/cm , 1849 psi) for 10 seconds.
3. If you find a fuel leakage, replace the nozzle piece.
Valve seat tightness Factory spec.
Valve Seat Tightness
[D1803-M-DI, V2403-M-DI, V2403-M-DI-T]
1. Set the injection nozzle to a nozzle tester.
2. Increase the fuel pressure, and keep it at 16.67 MPa
2
(170.0 kgf/cm , 2418 psi) for 10 seconds.
3. If you find a fuel leakage, replace the injection nozzle assembly.
Valve seat tightness Factory spec.
1-S35
ENGINE
18.64 to 20.10 MPa
190.0 to 205.0 kgf/cm
2703 to 2915 psi
M00000003GEG0041US1
V2003-M-BG, V2003-M-T-BG,
No fuel leak at
12.75 MPa
2
130.0 kgf/cm
1849 psi
M00000003GEG0042US1
No fuel leak at
16.67 MPa
2
170.0 kgf/cm
2418 psi
M00000003GEG0043US1
KiSC issued 06, 2009 A
2