Kubota M6800S Workshop Manual page 153

M6800 · M6800S · M8200 · M9000, WSM
(B) Injection Nozzle
CAUTION
• Check the 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.
Fuel Injection Pressure
1. Set the injection nozzle to the 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.
NOTE
• Heat seal and injection nozzle gasket must be changed when
the injection nozzle is remove for cleaning or for service.
Injection pressure Factory spec.
(Reference)
• Pressure variation with 0.01 mm (0.0004 in.) difference of
adjusting washer thickness.
Approx. 2.35 kPa (2.4 kgf/cm
(1) Adjusting Washer
Nozzle Spraying Condition
1. Set the injection nozzle to a nozzle tester (Code No. 07909-
31361), and check the nozzle spraying condition.
2. If the spraying condition is defective, replace the nozzle piece.
(a) Good
Valve Seat Tightness
1. Set the injection nozzle to a nozzle tester (Code No. 07909-
31361).
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.
Injection pressure Factory spec.
1-S68
13.73 to 14.71 MPa
140 to 150 kgf/cm
1991 to 2133 psi
2
, 34 psi)
(b) Bad
No fuel leak at
12.75 MPa
2
130 kgf/cm
1849 psi
ENGINE
2
W1073251
W1073359
2
,
W1073467
KiSC issued 03, 2008 A