Kubota SM-E3B Series - Servicing; Nozzle Spraying Condition; Fuel Injection Pressure; Nozzle Valve Seat Tightness

S-20
SM-E3B SERIES WSM
DIESEL ENGINE
CAUTION
• Check the nozzle injection pressure and condition after confirming that there is nobody standing in the
direction the fume goes.
• If the fume from the nozzle directly contacts the human body, cells may be destroyed and blood poisoning
may be caused.
Nozzle Spraying Condition
1. Set the injection nozzle to a nozzle tester, and check the nozzle
spraying condition.
2. If the spraying condition is defective, replace the nozzle piece.
W10181310
Fuel Injection Pressure
1. Set the injection nozzle to a nozzle tester.
2. Slowly move the tester handle to measure the pressure at which
fuel begins jetting out from the nozzle.
3. If the measurement is not within the factory specifications,
replace the adjusting washer (1) in the nozzle holder to adjust it.
(Reference)
• Pressure variation with 0.025 mm (0.00098 in.) difference of
adjusting washer thickness.
Approx. 590 kPa (6.0 kgf/cm
2
, 85 psi)
W10182100
Nozzle Valve Seat Tightness
1. Set the injection nozzle to a nozzle tester.
2. Raise the fuel pressure, and keep at 12.75 MPa (130.0 kgf/cm
2
,
1849 psi) for 10 seconds.
3. If any fuel leak is found, replace the nozzle piece.
W10183690
(a) Good (b) Bad
Fuel injection pressure Factory spec.
13.73 to 14.70 MPa
140.0 to 150.0 kgf/cm
2
1992 to 2133 psi
(1) Adjusting Washer
Valve seat tightness Factory spec.
No fuel leak at
12.75 MPa
130.0 kgf/cm
2
1849 psi
KiSC issued 03, 2011 A