Isuzu N-Series. Manual — part 635
ENGINE ELECTRICAL 6D-33
Reassembly of Vacuum Pump
1. Position the rotor, with the serrated boss turned up,
on the center plate and housing.
Align the holes in center plate and rotor.
2. Install vanes into slits in rotor.
The vanes should be installed with chamfered side
turned outward.
3. Install the O-ring and center plate
Reassembly
1. Brush Holder
2. IC Regulator Assembly
• Hold the brush in the holder as shown in the il-
lustration and solder the lead wire.
• Put the IC regulator on the brush holder and
press the bolt.
Bushing and connecting plate (1) must be in-
stalled when pressing the bolt.
3. Diode
• Connect the terminals by fixing the rivet at (1)
and soldering the terminal at (2).
4. Stator
• When connecting stator coil leads and diode
leads using solder, use long-nose pliers and
finish the work as quickly as possible to prevent
the heat from being transferred to the diodes.
Legend
1. Chamfered side
N6A3547E
N6A3548E
N6A3549E
N6A3550E
6D-34 ENGINE ELECTRICAL
5. Rear Cover
6. Terminal Bolt and Nut
7. Rear Bearing
8. Rotor
• Cover vice with copper plates, clamp the rotor
with the vice, and tighten nut to the specified
torque.
Tighten:
Pulley Nut to 90 N
⋅m (9.2 kg⋅m/67 lb⋅ft)
9. Stator and Rear Cover Assembly
10. Rotor and Front Cover Assembly
11. Through Bolts
• Place guide bar through the holes in front cover
and rear cover flange for alignment, then install
the through bolts.
• Tighten the through bolts to the specified
torque
Tighten:
Through Bolts to 3.5 N
⋅m (0.36 kg⋅m/31 lb⋅in)
12. Lead wire
13. Vacuum Pump
• Install and mount the housing to the generator
using 3 bolts.
• Pour engine oil (5 cc or so) in through the filler
port, then check that generator pulley can be
turned smoothly with hand.
• Tighten the pump fixing bolts (A) to the speci-
fied torque.
Tighten:
Through Bolts to 3.5 N
⋅m (0.36 kg⋅m/31 lb⋅in)
• Pour engine oil (5 cc or so) through the filler
port, and then check the pulley for smooth rota-
tion.
N6A3551E
N6A3552E
N6A3553E
N6A3554E
ENGINE ELECTRICAL 6D-35
QOSII PREHEATING SYSTEM (4JB1/4JB1-TC/4JH1-TC ONLY)
General Description
QOS II preheating system features a quick-on glow plug with thermometer control of the glowing time and the after-
glow time function.
The system consists of a controller, indicator lamp, thermoswitch, relay, and glow plug (4 pcs).
With the employment of the thermoswitch, the glow time changes according to the engine coolant temperature, thus
allowing optimum starting conditions to be obtained.
System Diagram
QOS II Timing Chart
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N6A3573E
6D-36 ENGINE ELECTRICAL
Inspection on QOSII System Operation
Thermo Switch
The thermo switch is located on the water outlet pipe.
Use a circuit tester to check the thermo switch for conti-
nuity.
Glow Plug
Use a circuit tester to test the glow plugs for continuity.
OFF
→ ON : 7 — 13°C (44.6 — 55.4°F)
ON
→ OFF : Below 3°C (37.4°F)
Glow Plug Resistance (Reference)
Ohms
Conventional model
Approximately 1.5
Quick on start model
Approximately 0.9
N6A3387E
N6A3575E
N6A3576E
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