Isuzu N-Series. Manual — part 413
6D3-20 CHARGING SYSTEM
• Increase the number of the generator rotations
gradually until the reading of the voltmeter indi-
cates 27V. Measure the number of rotations at
this time.
4. Output current measurement
• Set the resistance of the variable resistor at the
minimum, and rotate the generator with SW1
and SW2 closed.
• While keeping the voltage steady at 27V after
adjusting the variable resistor, read the indicat-
ed value of the ammeter at the generator rota-
tion of 5,000 rpm.
Current at 27V with 5,000 rpm = 35A or more (for
35A specification)
Current at 27V with 5,000 rpm = 45A or more (for
50A specification)
5. Unit test of vacuum pump
• With a pipe arrangement as shown in the illus-
tration, use the vacuum pump tester to conduct
the measurement.
• Pour about 20 liter (5.28 US gal/4.40 UK gal) of
engine oil into the vacuum pump tester.
• Increase the generator rotations gradually, and
check to see if the engine oil is fully circulated
by discharging oil from the exhaust side of the
vacuum pump.
• Close the release valve and measure the “vac-
uum characteristic” and the “vacuum drop char-
acteristic (air tight characteristic)”. Then check
the obtained values based on the following ta-
ble.
N6A1082E
N6A1085E
N6A1662E
N6A1663E
CHARGING SYSTEM 6D3-21
• 4HE1-TC LR180-510 (12-50A)
6. On-vehicle test of the vacuum pump
• Install the generator to the engine.
• With the engine idling, check to see if oil is be-
ing discharged sufficiently from the exhaust
side of the vacuum pump.
• Idle the engine until the engine oil temperature
gets to the range of 70 — 80
°C (158 — 176°F).
• Connect the pipe only to the suction side of the
vacuum pump tester, and conduct the test in
the same manner as in the unit test. When the
resulting value is outside the specified range,
re-check the vacuum pump.
Item
Performance
Specifications
Vacuum
characteristic
5000 rpm — 66.7
kPa (500 mmHg /
9.67 psi)
Less than 4
sec.
Max. 5000 rpm
More than
90.7 kPa (680
mmHg / 13.15
psi)
Vacuum-
down perfor-
mance
Valve of vacuum-
down 15 sec. after
the vacuum pump is
stopped at 53.3 kPa
(400 mmHg / 7.73
psi).
Less than 2.67
kPa (20
mmHg / 0.39
psi)
Test condition Oil used
Mobil oil #30
Oil tempera-
ture
75
±5°C (167±41°F)
Oil pressure
441 kPa (4.5 kg/cm
2
/
63.96 psi)
Item
Performance
Specifications
Vacuum
characteristic
5000 rpm — 66.7
kPa (500 mmHg /
9.67 psi)
Less than 10
sec.
Max. 5000 rpm
More than
90.7 kPa (680
mmHg / 13.15
psi)
Vacuum-
down perfor-
mance
Valve of vacuum-
down 15 sec. after
the vacuum pump is
stopped at 53.3 kPa
(400 mmHg / 7.73
psi).
Less than 2.67
kPa (20
mmHg / 0.39
psi)
Test condition Oil used
Mobil oil #30
Oil tempera-
ture
75
±5°C (167±41°F)
Oil pressure
441 kPa (4.5 kg/cm
2
/
63.96 psi)
Legend
1. Vacuum pump tester
2. Intake
N6A1090E
6D3-22 CHARGING SYSTEM
QOS II PREHEATING SYSTEM 6D6-1
ENGINE 4H SERIES
SECTION 6D6
QOS II PREHEATING SYSTEM
Contents
GENERAL DESCRIPTION . . . . . . . . .6D6-2
Component . . . . . . . . . . . . . ..6D6-3
STARTING CIRCUIT DIAGRAM (REFERENCE)...6D6-4
Component . . . . . . . . . . . . . ..6D6-4
Inspection and Repair. . . . . . . . . ..6D6-5
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