Toyota 3R-B 1969, Repair Manual

Page: 149 / 193

8-10 C H A R G I N G S Y S T E M — Al ternator
7. R em ov e the brush holder a ssem ­
bly in the following manner.
a. R em ov e the brush lead w ir e s
from the holder.
b. R em ove the terminal insulators .
c . R em ove the stator coil MN n
terminal lead from the holder.
When removing the brush holder
a s s e m b ly , do not re m o ve it by
cutting the " N 11 terminal lead o r
melting the s o ld e r.
F i g . 8-13 Rem oving Brush V1141
H older
Inspection & R ep air
B e a rin g
Check the bearings fo r s c o r e s , rough­
n e s s , abnormal noise o r damage.
If defective, replace the bearing/s.
R o to r
1. Check the ro tor coil fo r open o r
short circuit.
Connect a circuit tester from the
slip ring to the other ring.
T h e coil resistance should be 3 . 5
to 3.7 ohms on the R S , R T 4 3 L ,
R T 5 2 L and R K 1 7 1 B s e r i e s , and
4.1 ~ 4 .3 ohms on R K s e r ie s
except on R K 1 7 1B s e r ie s .
If there is little o r no resistance,
the coil o r slip rings indicate a
short o r ground, and considerably
higher than that specified above,
indicates an opened coil o r con­
nection defect.
If the test show s that the rotor
coil is shorted o r opened, and the
slip rings a re defective, the rotor
assembly should be replaced.
F ig . 8-14 Testing R otor Coil V2196
fo r Open & S h ort Circuit
2. Connect the tester from the slip
ring to the ro tor o r rotor shaft,
and check the insulation between
them.
If the tester needle m oves, the
rotor coil o r slip rings a r e d e ­
fective .
T h e rotor assembly should be r e ­
placed .
F i g . 8-15 T estin g R otor V2197
Coil fo r Ground
Stator
1. Check the stator coil f o r insulation .
Connect the tester between the
stator coil lead and the stator c o r e .
If the tester needle m oves, the
coil insulation is defective.
R e p a ir the coil o r replace the
stator a s s e m b ly .