Kubota D1102-B, Workshop Manual, Page: 61 / 109

KiSC issued 09, 2007 A
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Control rack position (
*
1 ) Speed (min-
1
(rpm)) Amount o-f inj-ction (rnm 3 /st) Allowance (mm
3
)( *3)
"
_, "
0
Checking Fuel-Tightness of Fuel Injection
Pump Plunger
1) ) Attach a pressu re ga uge to the pu mp.
2) Rotate th e f l ywheel to i ncrease the pressu re to 58.8 MPa. (600
kgf /cm
2
8532 l b./sq.i n.) .
3) Al ign the pl u nger wi th the top dead center.
4) Measu re the ti me needed to decrease the i n itial pressu re
f rom 58.8 MPa. to 49.0 MPa. (600 kgf /cm
2
to 500 kgf I
cm
2
,
8532 l b./sq.i n. to 7110 l b./sq.i n.)
5) I f the measu rement is not accepta ble, repl ace the pu m p
element. I n th is case, ask a repai r shop to do the repl ace-
ment. Be su re to give them adjustment reference data on
the f uel i njection pum p. (Shown l eft)
(A) Profile of fuel pump cam
9
sct
C
Ol 9 F036
• Adjustment reference data of fuel injection pump
• Test Conditions
Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . DN12SD12
Opening pressure . . . . . . . . . . 13.73 MPa (140 kgf/cm
2
)
Pipe . . . . . . . . . . . . . . . . 6 mm in diameter x 2 mm in
diameter x 600 mm
Fuel feed pressure . . . . . . . . . . . 19.6 kPa ( 0.2 kgf/cm
2
)
Cam profile . . . . . . . • . • . . . • . . . . . . See Fig. below.
Prestroke . . . . . . . . . . . . . . . . . . . . . 2.2
±
0.05 mm
Test fuel . . . . . . . . . . . . . • . . . • . Diesel Fuel No.2-D
• Adjustment of injection
9
1400 23 ±
1 .5
± 1.5 or less
8
1400
18.5 7.5 ± 3.8 or less
7
1400
13.5 ± 7.5
± 3.8 or less
0 to 3.5 1550
0 ( *2)
*1 Travel distance from non-injecting point of control rack
*2 Zero opening pressure and no injection
*3 Allowance on the basis of standard cylinder
57
0
Checking Fuel-Tightness of Delivery Valve of
Fuel Injection Pump
1) ) Attach a pressu re ga uge to t he pu m p.
2) Rotate th e flywheel to i ncrease the pressu re to 9.8 MPa.
(100 kgf /cm
2
,
1422 l b./sq.i n.) .
3) A l ign the pl u nger w ith the bottom dead center.
4) Measu re the t i me needed to decrease the i n itia l pressu re
from 9.8 M Pa. to 490.3 kPa. ( 100 kgf /cm
2
to 5 kgf /cm
2
1422 l b./sq.i n. to 71.1 l b./sq.i n.)
5) If the measu rement is not accepta ble, replace the del ivery
va l ve.
C
O J 9 F034