Isuzu NHR 4J Series, Workshop Manual

Page: 364 / 406

CHARGING SYSTEM 6D3 – 19
7. Removal of Bearing (on the Rear Side) [Only for
Replace.]
Take out the bearing with a puller.
Insert it to see whether replacement is needed.
NOTE:
Conduct the bearing inspection mentioned below and
determine whether or not the bearing be replaced.
INSPECTION AND REPAIR
NOTE:
Standard values and limits vary with alternators, and
therefore, maintenance standards for each part
should be followed.
1) Fan
Check to see whether it is deformed.
2) Bearing
Turn it by hand to check for smooth and noiseless
turning.
3) Stator
•
Resistance between phases (neutral point and each
phase lead wire) should be 1
Ω
or less.
• Insulation resistance between the core and stator coil
should be 0.1M
Ω
or more by a 500V megohmmeter.
NOTE:
If there is no continuity, the connection of lead wire
should be checked as the disconnected stator coil
cannot be considered.
4) Rotor
•
Resistance between slip rings as shows in the
illustration, about 4
Ω
.
• Insulation resistance between slip ring and ball core:
0.1M
Ω
or more by 500V megohmmeter.
• Check slip rings for surface. If staind or rough, use
sand paper (#300 - #500).
6D3-19-1.tif
6D3-19-2.tif
6D3-19-3.tif
Tighten the lightly with
a vise with care not to
cause any damage
.