Isuzu engine 4j series. Manual - part 84

6D2 – 6  STARTING SYSTEM

3. Yoke Assembly

Separate the yoke from the solenoid switch.

4. Yoke Cover

5. Brush and Brush Holder

Remove (pull out) the brushes and the brush holder from
the armature with a pair of long-nose pliers.

6. Armature

7. Drive Side Housing

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STARTING SYSTEM  6D2 – 7

8. Overrunning Clutch

Remove the overrunning clutch from the housing.

9. Return Spring

Remove the return spring from magnetic switch.

10. Steel Ball

Remove the steel ball from the overrunning clutch.

11. Idle Pinion

Remove the idle pinion from housing.

12. Retainer

Remove the retainer from housing.

13. Roller

14. Magnetic Switch

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6D2 – 8  STARTING SYSTEM

INSPECTION AND REPAIR

Make necessary correction or parts replacement if wear,
damage or any other abnormal condition are found
through inspection.

ARMATURE

Check the commutator for run-out and replace if the
amount of run-out exceeds the limit.
Run-out test

mm (in.)

kw

Standard

Limit

2.2

2.0

0.02 (0.0008)

0.05 (0.0020)

Check the mica segment for wear.
Depth of mica segment

mm (in.)

kw

Standard

Limit

2.2

2.0

0.7 - 0.9 (0.028 - 0.035)

0.20 (0.008)

Check the commutator outer diameter.
Commutator outer diameter

mm (in.)

kw

Standard

Limit

2.2

2.0

35.00 (1.378)

34.00 (1.339)

Armature short circuit test

Check the armature for short circuit by placing it on a
growler tester.  Hold a piece of hacksaw blade against the
armature core while slowly rotating the armature.  A short-
circuited armature will cause the blade to vibrate and to be
attracted by the core.  If the hacksaw blade is attracted or
vibrates, the armature, is short circuited, and must be
replaced.

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STARTING SYSTEM  6D2 – 9

Armature ground test

Touch one probe of a circuit tester to the commutator
segment and the other to the armature core.  There
should be no continuity.  If there is a continuity, the
armature is grounded.  Replace the armature if it is
grounded.

Armature continuity test

Connect the probes of a circuit tester across the 2
segments.  There should be continuity at any test points.
Replace if it is open-circuited.

YOKE

Field winding ground test

Using circuit tester, touch one probe to the field winding
end or brush and the other to the bare surface of yoke
body.
There should be no continuity.  If the tester indicates a
continuity, the field coil is grounded and yoke assembly
should be replaced.

Field winding continuity test

Using a circuit tester, touch one probe to the "C" terminal
lead wire and the other to the brush.  There should be
continuity.  Replace the yoke if it is open.

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