Isuzu N-Series. Service manual — part 621
6C-54 ENGINE FUEL
INJECTION PUMP DATA
Test Conditions
Notice:
′91/542A; Euro 1
′91/542B; Euro 2
Items
Conditions
Engine Type
4JB1 (Gear)
4JG2 (Belt)
(For
′91/542B)
Euro 2
4JB1 (Gear)
(For
′91/542A)
Euro 1
Injection Nozzle
ZEXEL Part Number
105780-0000
105780-0000
Bosch Type Number
DN12SD12T
DN12SD12
Injection Nozzle holder
ZEXEL Part Number
105780-2080
105780-2080
Bosch Type Number
EF8511/9
EF8511/9
Injection Nozzle Opening Pressure
MPa (kg/cm
2
/psi)
14.7 (150 / 2,133)
13.0 (133 / 1,891)
Injection Line di-
mensions
mm (in)
Inside Diameter
2 (0.079)
Outside Diameter
6 (0.236)
Length
840 (33.1)
450 (17.7)
Fuel delivery Pres-
sure
kPa (kg/cm
2
/psi)
20 (0.2 / 2.84)
Test Fuel
SAE Standard Test Diesel Fuel (SAE967D)
ISO Standard Test Diesel Fuel (ISO4113)
Test Fuel Tempera-
ture
°C(°F)
48 - 52 (118-126)
Identification Numbers
104746-1230
196000-1042
104742-1451
104746-1240
104742-1461
104746-1250
104742-1471
104746-1260
104742-1480
104746-1270
104742-1490
104746-1280
104746-1290
104746-1370
ENGINE FUEL 6C-55
Notice:
′91/542A ; Euro 1
′91/542B ; Euro 2
Items
Conditions
Engine Type
4JB1-TC
Injection Nozzle
ZEXEL Part Number
105780-0060
Bosch Type Number
Injection Nozzle holder
ZEXEL Part Number
105780-2150
Bosch Type Number
—
Injection Nozzle
MPa (kg/cm
2
/psi)
13.0 (133 / 1,891)
Opening Pressure
Injection Line di-
mensions
mm (in)
Inside Diameter
2 (0.079)
Outside Diameter
6 (0.236)
Length
450 (17.7)
Fuel delivery Pres-
sure
kPa (kg/cm
2
/psi)
20 (0.2 / 2.84)
Test Fuel
SAE Standard Test Diesel Fuel (SAE967D)
ISO Standard Test Diesel Fuel (ISO4113)
Test Fuel Tempera-
ture
°C(°F)
48 — 52 (118 — 126)
Identification Numbers
104746-6601
104766-6620
6C-56 ENGINE FUEL
Identification Plate and Number
Use the data following the injection pump identification
number to adjust the injection volume.
N6A3462E
N6A3463E
N6A3464E
ENGINE FUEL 6C-57
INJECTION VOLUME AND GOVERNOR PERFORMANCE DIAGRAM
Governor Performance Diagram
Engine ; 4JB1
Injection pump assembly No. ;
8943616830 (104741-6410)
8943616850 (104741-6430)
Adjustment specification of injection volume
Adjustment specification of timer and pump case pressure
Pump rotation
(rpm)
Average injection
quantity
(mm
3
/ST)
Uneven amplitude
(mm
3
/ST)
Oil temperature
(
°C)
Remarks
500
(38.6)
—
48
±2
700
34.9
±2.5
—
50
±2
1000
42.1
±1.0
4.0
50
±2
Standard
1450
44.5
±2.5
—
50
±2
1800
47.6
±3.0
—
60
±2
2100
12.9
±3.0
4.0
52
±2
390
6.7
±3.0
2.0
48
±2
100
60 -100
—
48
±2
N6A3465E
Pump rotation
(rpm)
Timer piston stroke (mm)
Air pressure of pump
(kPa (kg/cm
2
))
Remarks
Solenoid timer
Solenoid timer
ON
OFF
ON
OFF
700
Over 0.5
—
—
—
1300
—
1.4
±0.4
—
—
1600
—
3.9
±2
—
490
±20
(5.0
±0.2)
Standard
1950
—
7.0
+ 0.4
-0.3
—
—
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