Toyota 3R-B 1969, Repair Manual

Page: 166 / 193

S T A R T I N G S Y S T E M - S t a r t e r 9-7
a tool similar to the one as shown
in the illustration.
D r iv e out the pinion stop collar
towards the starter clutch side
first using the tool, and rem ove
the snap ring.
N ext, re m o ve the stop collar and
the starter clutch.
T h e p r o p e r depth should be 0 .5
to 0.8 mm (0.02 ~ 0 . 0 3 " ) .
L im i t 0.2mm ( 0 . 0 0 8 ' )
C o r r e c t
Inspection & Repair
A rm atu re
1. Inspect the clearan ce between the
armature shaft and the bushings.
T h e clearance should not exceed
0 .2 mm (0 .0 08 " ) .
S e le c t a p ro p e r size bushing to
obtain a clearance of less than
0.035 ~ 0.135
mm (0.002 to
0 . 0 0 4 " ) .
A rm a tu re shaft diameter:
12.50 mm (0 .4 7 2 " )
A rm atu re shaft bushing inner
diameter:
S T D 12.535 ~ 12.560 mm
(0.493 I 0 .4 9 4 " )
U / S - 0 .30
12.235 ~ 12.260 mm
(0.482 ~ 0 .4 8 3 " )
U / S - 0 . 50
12.035 ~ 12.060 mm
(0.474 ~ 0 .4 7 5 " )
2. Check the commutator fo r rough­
n ess, burnt o r s co re d su rface.
If n e c e s s a r y , d r e s s o r cut with
a lathe just enough to re m o ve stock
to clean the su rface.
If the diameter of the commutator
is out-of-round m ore than 0.3 mm
(0 .012" ) , cut the commutator on
a lathe.
T h e out-of-round should be less
than 0.1 mm ( 0 . 0 0 4 " ) .
T h e servicea b le limit of the com ­
mutator is 36.8 mm ( 1 . 4 5 " ) , and
if the limit e x c e e d s , replace the
a rm atu re.
T h e specified commutator diameter
is 3 8 .8 m m ( 1 . 5 3 " ) .
3. Check the mica depth, and file off
the mica if the depth is less than
0 .2 mm ( 0 . 0 0 8 " ) .
I n c o r r e c t
F ig . 9-9 Mica Depth
G0151
4. Check the armature coil f o r ground
using a g r o w l e r .
Connect one test prod on the com ­
mutator , and the other test prod
on the armature c o r e o r shaft.
If the test lamp lights, the a rm a ­
ture coil is grounded.
R ep air o r replace the arm ature.
F i g . 9-10
Testing A rm a tu re
Coil fo r Ground
V2186
Check the armature coil f o r inter­
nal short by placing the armature
on the g r o w l e r , and hold a hack­
saw blade o v e r the armature c o r e
while rotating the arm ature.
If the hacksaw blade v ib r a te s , the
armature coil is shorted.
R e p a ir o r replace the arm ature.
Check the armature coil fo r open
circuit by placing the armature on
the g r o w l e r , and connect the two
commutator segments with the test
p r o d s , and check the reading.