Kubota ZD21F - Fuel System

1-S16
ZD18(F) · ZD21(F) · ZD28(F), WSM
ENGINE
[4] FUEL SYSTEM
W1013874
Item Factory Specification Allowable Limit
Injection Pump Injection Timing 0.33 to 0.37 rad.
19.0 to 21.0°
before T.D.C.
–
Pump Element Fuel Tightness – 14.7 MPa
150 kgf/cm
2
2133 psi
Delivery Valve Fuel Tightness 10 seconds or more for
pressure falling
from 14.7 to 13.7 MPa
from 150 to 140 kgf/cm
2
from 2133 to 1990 psi
5 seconds for
pressure falling
from 14.7 to
13.7 MPa
from 150 to
140 kgf/cm
2
from 2133 to
1990 psi
Fuel Injection Nozzle Injection Pressure 13.73 to 14.71 MPa
140 to 150 kgf/cm
2
1991 to 2133 psi
–
Fuel Injection Nozzle Valve Seat Valve Seat
Tightness
When the pressure is
12.75 MPa
(130 kgf/cm
2
, 1849 psi),
the valve seat must be
fuel tightness.
–
KiSC issued 04, 2009 A