Isuzu N-Series. Manual — part 399
6C-74 FUEL SYSTEM
Governor A
d
justment
Governor adjustment
N6A0964E
FUEL SYSTEM 6C-75
Boost compensator adjustment
1. Select a push rod so (C) = 37.5
±0.5 mm (1.48±0.02
in) at full boost pressure. ((C) is the distance from
the end face of the housing to top of the lever.)
2. Adjust the boost compensator stroke using screw
(A). (0 boost pressure position adjustment)
Adjust the beginning of boost compensator opera-
tion by adjusting the notch adjusting nut (B).
Timing cam adjustment (Timing cam No: 510)
1. Hold speed control lever against full speed stopper
bolt.
2. Supply boost pressure of at least 44.0 kPa (330
mmHg/6.38 psi)
3. Operate pump at the timing cam adjusting point
(point a table below: Np = 1,000 r/min).
4. Perform timing cam adjustment so output voltage
is within range of a1 — a2 actually measured for
pore-stroke output voltage during injection timing
adjustment in 3 — 4.
5. Operate the pump at the timing cam confirmation
point.
(point b in table below: Np = 1,200 r/min)
6. Confirm that the pre-stroke output voltage is within
the range b1 — b2.
Legend
1. Top of lever
2. Push rod
3. Boost pressure inlet
4. Boost compensator spring
Adjusting point
Pre-stroke
(mm (in))
Output
voltage
(actual)
Remarks
a
3.70
(0.1457)
a1
+ tolerance
3.44
(0.1354)
a2
− tolerance
N6A0965E
Confirmation
point
Pre-stroke
(mm (in))
Output
voltage
(actual)
Remarks
b
3.24
(0.1276)
b1
+ tolerance
3.04
(0.1197)
b2
− tolerance
6C-76 FUEL SYSTEM
Injection Quantity
FICD Adjustment
1. Stop the injection pump.
2. Hold speed control lever against idling stopper bolt.
3. Adjust clearance between FICD actuator lever and
speed control lever to approx. 1+1 mm
(0.0394+0.0394 in).
4. Loosen nut (3) and fully tighten FICD set bolt (2).
5. Apply 53.3 kPa (400 mmHg/7.73 psi) negative
pressure to the actuator (1) and set the pump
speed at 450 r/min.
6. Gradually loosen set bolt (2) then fix bolt using nut
when the rack position is 8.1±0.1 mm
(0.3189
±0.0039 in).
7. Apply above negative pressure several times and
confirm FICD actuator is operating properly and
clearance between FICD actuator lever and speed
control lever.
Adjust-
ing point
Rack
position
(mm (in))
Pump
speed
(r/min)
Injection
q’ty (cm
3
/1,000
strokes)
Max.
variation
between
cylinders
Fixed
Pre-stroke
at adjust-
ment
Remarks
—
16.1
(0.6339)
1,000 124
±1.6
±4
Rack
a1 — a2
(v)
Basic
Cylinder variation adjust-
ment standard
Z
8.7
±0.5
(0.3425
±
0.0197)
585
14
±1.5
±14
Rack
c (v)
Cylinder variation adjust-
ment standard
A
R1 (16.1
(0.6339))
1,000
124
±1
—
Lever
a1 — a2
(v)
Basic
Boost press. kPa (mmHg/
psi)
Above 44.0 (330/6.38)
B
R1+0.45
(0.0177)
1,150
123.5
±2
—
Lever
Measure
Boost press. kPa (mmHg/
psi)
Above 44.0 (330/6.38)
D*
16.15
±0.1
(0.6358
±
0.0039)
1,150
—
—
Lever
Measure
Boost press. kPa (mmHg/
psi)
Above 44.0 (330/6.38)
Negative press. kPa
(mmHg/psi)
53.3 (400/7.73)
D*: Aneroid compensator actuator adjustment point
Legend
1. Actuator
2. Set bolt
3. Nut
4. Speed control lever
5. FICD actuator lever
6. Tightening torque 5 — 7 N
⋅m (0.5 — 0.7 kg⋅m/
3.7 — 5.2 lb
⋅ft)
N6A0966E
FUEL SYSTEM 6C-77
Aneroid Compensator Actuator Adjustment (In-
jection Quantity Decrease)
Notice:
Set this actuator after adjusting the full rack position.
1. Stop injection pump.
2. Adjust wire nut so full load set lever contacts full
load set bolt and aneroid compensator actuator
wire is not loose. Then, fix the nut.
3. Apply 53.3 kPa (400 mmHg/7.73 psi) negative
pressure to aneroid compensator, set pump speed
at 1,150 r/min.
4. Apply at least 44.0 kPa (330 mmHg/6.38 psi) boost
pressure to the boost compensator.
5. After operating full load set lever, adjust aneroid
compensator set bolt so control rack position is
16.15±0.1 mm (0.6358
±0.0039 in) and fuel injec-
tion quantity is as specified. Then, fix the set bolt.
Rack Sensor Adjustment
1. Before removing rack position measuring device,
apply at least 44.0 kPa (330 mmHg/6.38 psi) boost
pressure and confirm rack position is R1 = 16.1
mm and fuel injection quantity is 124
±1 mm
3
/st at
N = 1,000 r/min.
2. Remove the rack position measuring device.
3. Attach the rack sensor core to the control rack.
Legend
1. Rack position (mm)
2. Pump speed (r/min)
3. Stroke
4. Injection quantity decrease adjustment point
N6A0967E
Legend
1. Nut
2. Set bolt
3. Full load set lever
4. Full load set bolt
Legend
1. Rack position (mm)
2. Pump speed (r/min)
N6A0968E
N6A0969E
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