Isuzu engine 4j series. Manual - part 89

6D3 – 14  CHARGING SYSTEM

VACUUM PUMP

Visual check

•

Inspect the following parts for wear, damage or other
abnormal conditions.

Disassembly of Vacuum pump

•

For the center plate, rotor and vane in the mentioned.

Housing

•

Measure the inside diameter of housing and place if it
exceed the standard.

mm (in)

Standard

57.0 - 57.1

(2.244 - 2.248)

Vane
Measure the length of vanes

mm (in)

Standard

12.5 - 13.5 (0.492 - 0.531)

Check Valve

1. Apply a light pressure onto the "B" side of valve with a

screw driver and check that valve operates smoothly.

2. Apply compressed air 1 - 5 kg/cm

2

 onto "A" side of

valve and check if there is air leak.

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

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6D3-14-4.tif

CHARGING SYSTEM  6D3 – 15

REASSEMBLY

13. Brush Holder

12. IC Regulator Assembly

•

Hold the brush in the holder as shown in the illustration
and solder the lead wire.

•

Put the IC regulator on the brush holder and press the
bolt.
Bushing and connecting plate must be installed when
pressing the bolt.

11. Diode

•

Connect the terminals by fixing the rivet at 1 and
soldering the terminal at 2.

10. 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.

9. Rear Cover

8. Terminal Bolt and Nut

7. Rear Bearing

6. Rotor

•

Cover vice with copper plates, clamp the rotor with the
vice, and tighten nut to the specified torque.

Pulley Nut Torque

N∙m (kg∙m/lb∙ft)

                                                                                                                   

90 (9.2/67)

                                                                                                                   

6D3-15-1.tif

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6D3-15-3.tif

6D3-15-4.tif

6D3-15-5.tif

6D3 – 16  CHARGING SYSTEM

5. Stator and Rear Cover Assembly

4. Rotor and Front Cover Assembly

3. 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

Through Bolts Torque

N∙m (kg∙m/lb∙in)

                                                                                                                   

3.5 (0.36/31)

                                                                                                                   

2. Read wire

1. 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 to the specified torque.

Pump Fixing Bolts Torque

N∙m (kg∙m/lb∙in)

                                                                                                                   

3.5 (0.36/31)

                                                                                                                   

•

Pour engine oil (5 cc or so) throuh the filler port, and
then check the pulley for smooth rotation.

6D3-16-1.tif

6D3-16-2.tif

CHARGING SYSTEM  6D3 – 17

UNIT REPAIR

DISASSEMBLY

1. Removal of Through Bolts

Remove the three through bolts.

2. Separation of Drive End Frame and Rear End Frame &

Stator
As illustrated, put a screw-driver into the notched part of
the drive end frame and separate the rear end frame and
stator from the drive end frame.

NOTE:

Be careful not to put in a screw-driver to excess so as
to prevent the stator coil from being scratched.

6D3-17-2.tif

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6D3-17-1.tif