wsm Kubota L4100, Workshop Manual

Page: 88 / 346

ENGINE L4100, WSM
1-S16
(EU)
(8) Injection Nozzle
CAUTION
• Check the nozzle injection pressure and condition after confirming that there is nobody standing in the
direction of the injected fuel.
• If the injected fuel from the nozzle directly contacts the human body, cells may be destroyed and blood
poisoning may be caused.
9Y1210278ENS0012US0
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.
9Y1210278ENS0013US0
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)
9Y1210278ENS0014US0
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.
9Y1210278ENS0015US0
(a) Good (b) Bad
Fuel injection pressure Factory specification
13.73 to 14.70 kPa
140.0 to 150.0 kgf/cm
2
1992 to 2133 psi
(1) Adjusting Washer
Valve seat tightness Factory specification
No fuel leak at
12.75 MPa
130.0 kgf/cm
2
1849 psi
KiSC issued 08, 2012 A