Checking Fuel-Tightness Of Fuel Injection Pump Plunger; Checking Fuel-Tightness Of Delivery Valve Of Fuel Injection Pump - Kubota D1102-B Workshop Manual

C
O J 9 F034
(A) Profile of fuel pump cam
9
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C
Ol 9 F036
sct
• Adjustment of injection
Control rack position (
9
8
7
0 to 3.5
*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
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
2
kgf /cm 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
cm 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)
• Adjustment reference data of fuel injection pump
• Test Conditions
Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . DN12SD12
Opening pressure . . . . . . . . . . 13.73 MPa (140 kgf/cm
Pipe . . . . . . . . . . . . . . . . 6 mm in diameter x 2 mm in
Fuel feed pressure . . . . . . . . . . . 19.6 kPa ( 0.2 kgf/cm
Cam profile . . . . . . . • . • . . . • . . . . . . See Fig. below.
Prestroke . . . . . . . . . . . . . . . . . . . . . 2.2
Test fuel . . . . . . . . . . . . . • . . . • . Diesel Fuel No.2-D
1
*
1 ) Speed (min- (rpm)) Amount o-f inj-ction (rnm
1400
1400
1400
1550
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.
2
(100 kgf /cm 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
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.
57
2
to 500 kgf
diameter x 600 mm
±
3 /st) Allowance (mm
1 .5
23 ± ± 1.5 or less
± 3.8 or less
18.5 7.5
± 3.8 or less
13.5 ± 7.5
0 ( *2)
" _, "
2
to 5 kgf /cm
KiSC issued 09, 2007 A
I
2
)
2
)
0.05 mm
3
)( *3)
2