Isuzu N-Series. Manual - part 633

ENGINE ELECTRICAL 6D-25

• Connect the magnetic switch harness connec-

tor.

9. A/C compressor Drive Belt (A/C Model)

• Install A/C compressor drive belt and adjust

belt tension.

• Depress the drive belt mid-portion with a 98N

(10 kg/22 lb) force.

• Tighten the idler lock nut to the specified

torque.

Tighten:
Idle Pulley Lock Nut to 27 N

⋅m (2.8 kg⋅m/20 lb⋅ft)

4JG2

4JB1

• Connect the battery ground cable.

Drive Belt Deflection

mm (in)

New 7 — 8 (0.28 — 0.31)

Check 12 — 14 (0.47 — 0.55)

N6A3290E

N6A3297E

Legend

1. A/C compressor drive belt
2. P/S oil pump drive belt
3. AC generator fan pulley drive belt

Legend

1. AC compressor drive belt & PS pump drive belt
2. AC generator & fan pulley drive belt

N6A3295E

6D-26 ENGINE ELECTRICAL

Unit Repair

Component

12V-50A

Legend

1. Vacuum pump

8. Terminal bolt and nut

2. Lead wire

9. Rear cover

3. Through bolts

10. Stator

4. Rotor and front cover assembly

11. Diode

5. Stator and rear cover assembly

12. IC regulator assembly

6. Rotor

13. Brush holder

7. Rear bearing

N6A3527E

ENGINE ELECTRICAL 6D-27

Disassembly

1. Vacuum Pump

• Drain fluid from discharged port.
• Remove the vacuum pump fixing bolts. Hold

the center plate and remove the vacuum pump
horizontally in direction in line with the rotor
shaft.

2. Lead Wire
3. Through Bolts

4. Rotor and Front Cover Assembly
5. Stator and Rear Cover Assembly

• Insert a screwdriver into the clearance between

the front cover and the stator core, and remove
the assembly.

Notice:
Take care not to damage the stator coil with the screw-
driver. When the assembly will not come off, hold down
the rear cover and hit the end face of the shaft gently
with a plastic hammer to detach it.

6. Rotor

• With the rotor gripped with a vise, remove the

pulley nut (1), and then take off the pulley (2),
fan (3), front cover (4) and the rotor (5).

7. Rear Bearing
8. Terminal Bolt and Nut
9. Rear Cover

• Remove the nuts fixing the B terminal and di-

ode holder.
Separate the stator and rear cover.
Note the position of insulation washers to en-
sure reassembly into original position.

10. Stator
11. Diode

Legend

1. Seal protector

N6A3528E

N6A3529E

N6A3530E

N6A3531E

6D-28 ENGINE ELECTRICAL

• Separate the diodes from the stator by melting

away solder on stator coil and diode.
When melting solder, hold the lead wire with
long nose pliers to prevent heat from being
transferred to the diodes.

12. IC Regulator Assembly

• Separate the IC regulator from the diode by

melting away solder on IC regulator holder
plate and removing the nut.

13. Brush Holder

• Remove the serrated bolts and melt away sol-

der on IC regulator.

• Do not remove the serrated bolts unless the re-

placement of brush or condenser.
To install, follow the removal steps in the re-
verse order.

Inspection and Repair

Repair or replace necessary parts if extreme wear or
damage is found during inspection.
Rotor

1. Check the rotor slip ring surfaces for contamination

and roughness. If rough, polish with #500 — 600
sandpaper.

2. Measure the slip ring diameter, and replace if it ex-

ceeds the limit.

3. Check for continuity between slip rings, and re-

place if there is no continuity.

Legend

1. Terminal bolt
2. Terminal plate
3. Rivet
4. Diode

N6A3532E

Legend

1. Wear limit

mm (in)

Standard

Limit

34.6 (1.36)

33.6 (1.32)

N6A3533E

N6A3534E