Injection Nozzle - wsm Kubota L4100 Workshop Manual

L4100, WSM

(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.
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.
(a) Good
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
Fuel injection pressure Factory specification
(1) Adjusting Washer
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
1849 psi) for 10 seconds.
3. If any fuel leak is found, replace the nozzle piece.
Valve seat tightness Factory specification
1-S16
9Y1210278ENS0012US0
(b) Bad
9Y1210278ENS0013US0
2
, 85 psi)
13.73 to 14.70 kPa
140.0 to 150.0 kgf/cm
1992 to 2133 psi
9Y1210278ENS0014US0
No fuel leak at
12.75 MPa
2
130.0 kgf/cm
1849 psi
9Y1210278ENS0015US0
KiSC issued 08, 2012 A
ENGINE
2
2
,
(EU)