Isuzu N-Series. Service manual — part 623
6C-62 ENGINE FUEL
Engine ; 4JB1 (For
′91/542A) (Gear drive)
Injection pump identification No. ; 104742-1451, 1461, 1471
Adjustment specification of injection volume
N6A3470E
Pump rotation
(rpm)
Average injection
quantity
(mm
3
/ST)
Uneven amplitude
(mm
3
/ST)
Oil temperature
(
°C)
Remarks
500
(29.7
±4.5)
—
48
±2
1000
(46.4
±3.5)
—
50
±2
1150
47.6
±1.0
3.5
50
±2
Standard
1800
(55.5
+0.4
-6.0
)
—
50
±2
2100
14.9
±3.0
4.0
52
±2
Standard
375
7.3
±2.0
2.0
48
±2
Standard
N6A3471E
ENGINE FUEL 6C-63
Adjustment specification of timer and pump case pressure
Adjustment specification of aneroid compensator (For 104742-1471)
Pump rotation
(rpm)
Timer piston stroke
(mm)
At of pressure pump
(MPa(kg/cm
2
))
Remarks
Solenoid timer
Solenoid timer
ON
OFF
ON
OFF
700
Over 0.5
—
—
—
1400
—
1.5
±0.4
—
—
1600
—
3.0
±0.2
—
0.53
±0.02
(5.4
±0.2)
Standard
2100
—
5.7
+0.4
-0.3
—
—
N6A3617E
Pump rotation
(rpm)
Altitude
(m)
Air pressure differ-
ence
(kPa (mmHg))
Amount of reduction
(mm
3
/ST)
Rate of reduction
(%)
1150
0
0
0
0
(500)
−5.9±3.3
(
−44±25)
Inflation point
Inflation point
2000
−21.9
(
−164)
(
−5.2±1.3)
(
−11±3)
6C-64 ENGINE FUEL
Engine ; 4JB1 (For
′91/542A) (Gear drive)
Injection pump identification No. ; 104742-1480, 1490
Adjustment specification of injection volume
N6A3470E
Pump rotation
(rpm)
Average injection
quantity
(mm
3
/ST)
Uneven amplitude
(mm
3
/ST)
Oil temperature
(
°C)
Remarks
500
(29.7
±4.5)
—
48
±2
1000
(46.4
±3.5)
—
50
±2
1150
47.6
±1.0
3.5
50
±2
Standard
1800
(55.5
+0.4
-6.0
)
—
50
±2
2100
14.9
±3.0
4.0
52
±2
Standard
375
7.3
±2.0
2.0
48
±2
Standard
100
(60 -100)
—
48
±2
N6A3471E
ENGINE FUEL 6C-65
Adjustment specification of timer and pump case pressure
Pump rotation
(rpm)
Timer piston stroke (mm)
At pressure of pump
(MPa (kg/cm
2
))
Remarks
1400
(1.5
±0.4)
—
1600
3.0
±0.2
0.53
±0.02
(5.4
±0.2)
Standard
2100
5.7
+0.4
-0.3
—
N6A3619E
N6A3470E
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