Nozzle Spraying Condition Check; Check Nozzle Injection Pressure; Valve Seat Tightness Check - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service
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 injection nozzle
assembly or repair at Denso service shop.
(a) Good
Checking Nozzle 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 injection nozzle assembly or repair at Denso service
shop.
Note
• Injection nozzle gasket must be replaced when the injection
nozzle is removed for checking.
Factory
Injection pressure
spec.
Valve Seat Tightness
1. Set the injection nozzle to a nozzle tester.
2. Raise the fuel pressure, and keep at 16.67 MPa (170 kgf/cm
2418 psi) for 10 seconds.
3. If any fuel leak is found, replace the injection nozzle assembly or
repair at Denso service shop.
Valve seat tightness Factory spec.
III-S-110
(b) Bad
W10371670
18.63 to 19.61 MPa
1st
2
190 to 200 kgf/cm
stage
2702 to 2845 psi
W1037280
No fuel leak at
16.67 MPa
2
170 kgf/cm
2418 psi
W10374150
Engine
2
,