Isuzu N-Series. Service manual — part 410
6D3-8 CHARGING SYSTEM
UNIT REPAIR
Component
Legend
1. Vacuum pump assembly
11. Bearing retainer
2. Through bolt
12. Front ball bearing
3. Rotor and front cover assembly
13. Rear ball bearing
4. Stator and rear cover assembly
14. Terminal nut and bolt
5. Pulley nut
15. Stator
6. Pulley
16. Fan guide
7. Fan
17. Rectifier
8. Spacer
18. Brush and IC regulator
9. Rotor
19. Rear cover
10. Front cover
N6A1043E
CHARGING SYSTEM 6D3-9
Disassembly
1. Vacuum Pump Assembly
1) Loosen the vacuum pump fixing bolts.
2) Support the vacuum pump center plate.
3) Carefully remove the vacuum pump.
2. Through Bolt
3. Rotor and Front Cover Assembly
4. Stator and Rear Cover Assembly
1) Loosen the through bolts.
2) Remove the rotor and front cover assembly
from the stator and rear cover assembly.
Do not allow the stator to separate from the rear
cover.
Take care not to damage the oil seal.
Tape the rotor splines to protect them from
damage.
5. Pulley Nut
6. Pulley
7. Fan
8. Spacer
9. Rotor
1) Carefully clamp the rotor assembly in a vice.
2) Loosen the pulley nut (1).
3) Remove the pulley (2), the fan (3), the spacer
(4), the front cover (5) and the rotor (6).
10. Front Cover
11. Bearing Retainer
12. Front Ball Bearing
13. Rear Ball Bearing
14. Terminal Nut and Bolt
15. Stator
Legend
1. Taping
N6A1044E
N6A1045E
N6A1046E
N6A1047E
6D3-10 CHARGING SYSTEM
1) Loosen the terminal nuts and bolts.
2) Remove the lead wire, the insulators, and the
washers.
3) Remove the stator and the IC regulator assem-
bly from the rear cover.
16. Fan guide
17. Rectifier
18. Brush and IC Regulator
Disconnect the stator coil leads between each rec-
tifier and the N-terminal by melting the solder con-
nection.
Notice:
Hold the lead wire between the solder and the rectifier
with a pair of long nose pliers.
This will prevent heat transfer and resultant dam-
age to the rectifier.
Refer to “INSPECTION AND REPAIR” for the IC
regulator, the rectifier, the brush holder, and the
condenser replacement procedures.
19. Rear Cover
Inspection and Repair
Make the necessary adjustments, repairs, and part re-
placements if excessive wear or damage is discovered
during inspection.
Rotor
1. Inspect the slip ring faces for dirt and pitting.
Wipe away any dirt with a clean cloth soaked in al-
cohol.
Use a hand grinder to remove pitting.
2. Measure the slip ring diameter.
If the slip ring diameter is less than the specified limit,
the slip rings must be replaced.
N6A1048E
N6A1049E
Slip Ring Diameter
mm (in)
Standard
Limit
37.6 (1.480)
36.6 (1.441)
N6A1050E
N6A1051E
CHARGING SYSTEM 6D3-11
3. Measure the rotor coil resistance.
4. Check for continuity between the slip rings and the
rotor core or shaft.
If there is continuity, the entire rotor assembly must
be replaced.
5. Rear ball bearing
• Check to see if the ball bearings rotate lightly
with no noise heard.
• As the result of inspection, it is found that the
ball bearing do not rotate lightly or any noises
are heard, replace them with new ones.
Stator
1. Check for continuity across the stator coils.
If there is no continuity, the stator coils must be re-
placed.
Rotor Coil Resistance at
20
°C (68°F)
ohms
Standard
12.6
N6A1052E
N6A1053E
Legend
1. Ball bearing
Press-in measurement (L)
when changing bearings
mm (in)
Standard
58.0 — 58.2 (2.283 —
2.291)
N6A1054E
N6A1055E
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