Nanni N4.40, Workshop Manual

Page: 43 / 175

GENERAL
03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
G-28
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.
M00000003GEG0041US1
Valve Seat Tightness
[D1503-M, D1703-M, D1803-M, V2003-M, V2203-M, V2403-M,
V2403-M-T, D1703-M-BG, V2003-M-BG, V2003-M-T-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
(130.0 kgf/cm
2
, 1849 psi) for 10 seconds.
3. If you find a fuel leakage, replace the nozzle piece.
M00000003GEG0042US1
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
(170.0 kgf/cm
2
, 2418 psi) for 10 seconds.
3. If you find a fuel leakage, replace the injection nozzle assembly.
M00000003GEG0043US1
Fuel injection pressure
(1st stage)
Factory spec.
18.64 to 20.10 MPa
190.0 to 205.0 kgf/cm
2
2703 to 2915 psi
Valve seat tightness Factory spec.
No fuel leak at
12.75 MPa
130.0 kgf/cm
2
1849 psi
Valve seat tightness Factory spec.
No fuel leak at
16.67 MPa
170.0 kgf/cm
2
2418 psi
KiSC issued 06, 2009 A