Kubota WSM B2050 Workshop Manual page 110

B2050, B2350, B2650, B3150, WSM
Nozzle Spraying Condition
CAUTION
• Check the injection pressure and condition after you make
sure that there is nobody standing in the direction the fume
goes.
• If the fume from the nozzle directly injects the human body,
cells may be destroyed and blood poisoning may be
caused.
1. Set the injection nozzle to a nozzle tester, and check the nozzle
spraying condition.
2. If the spraying condition is damaged, 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.
Fuel injection pressure Factory specification
(Reference)
• Pressure variation with 0.01 mm (0.0004 in.) difference of
adjusting washer thickness:
Approx. 235 kPa (2.4 kgf/cm
(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 kgf/cm
1849 psi) for 10 seconds.
3. If any fuel leak is found, replace the nozzle piece.
Valve seat tightness Factory specification
1-S21
(b) Bad
9Y1210982ENS0019US0
13.73 to 14.71 MPa
140 to 150 kgf/cm
1990 to 2130 psi
2
, 34 psi)
9Y1210982ENS0020US0
No fuel leak at
12.75 MPa
2
130 kgf/cm
1849 psi
9Y1210982ENS0021US0
KiSC issued 03, 2014 A
ENGINE
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