1973 DATSUN B110 Service Repair Manual

ENGINE
ELECTRICAL

SYSTEM

2

Remove
two
bolts
llsed
to

secure
the

starting
motor

on
the

clutch

housing
Pull
the

starter

assembly
forward

and

remove
the

starting
motor

DISASSEMBLY

Remove
the
brush

cover
and
take
out
the

brush

6

Fig
EE
7

Removing
the

brush
cover

2
Loosen
the

nut
used

to
secure

the

connecting
plate

to
the

magnetic
switch
M

terminal
Remove

two
screws

used

to
secure
the

magnetic
switch

Remove
the

cotter

pin
and
withdraw

the
shift

lever

pin
Now

remove
the

magnetic
switch

Fig
EE
8

Removing
the

magnetic
switch

assembly

3
Remove

two

through
bolts

and

rear
cover
assembly

Remove
the

yoke
assembly
by

lightly
tapping
with
a

wooden
mallet
Fig
EE
9

Removing
the
brush
cover
and

yoke

assembly

4

Withdraw
the

armature

assembly
and

shift
lever

Fig
EE
l0

Removing
the
armature

assemlby
and

shift
lever

5

Remove
the

pinion
stopper
from
the
armature
shaft

end
To

remove
the

stopper
first

remove
the

stopper

washer
and

push
the

stopper
to
the

over

running
clutch

side
and
after

removing
the

stopper
clip
remove
the

stopper
together
with
the

over

running
clutch
Withdraw

the
over

running
clutch

assembly
from
the

armature
shaft

Fig
EE
11

Removing
the
over

running
clutch

assembly

EE
5

ENGINE

CLEANING
AND

INSPECTION

Clean

all
disassembled

parts
Be

careful
not

to
use

grease
dissolving
solvent

for

cleaning
of
the
over

running

clutch
armature

assembly
magnetic
switch

assembly
and

field
coils
since

solvent
dissolves

grease
packed
in
the

clutch
mechanism
and

damages
the
coils
or
insulators

Check
them
for

damage
or
excessive
wear

Replace

them
as

required

Terminal

Check
the
terminal

for

damage
and
wear
and

replace
if

necessary

Field
coil

Check
the

field
coil
for
insulation
If
the

coil
insulator

is

damaged
or
worn

replace

Testing
field
coil

for

continuity

Connect
test

probe
of
a
circuit
tester
or
a
resistance

counter
to
the
field
coil

positive
terminal
and

positive
brush

holder
If
the

tester
indicates

no

continuity
the
field
circuit
or

coil
is

open

O

Fig
EE
12

Cotltinuity
test

of
field
coil

Testing
field
coil
for

ground

Place
one

probe
of

a
circuit
tester
onto
the

yoke
and

the
othef
on
to
the
field
coil

positive
tenninal
If

resistance
is

read
the
field
coils
are

grounded
ol

I

Fig
EE
13
CTound
test

of
field
coil

Field
coil
test
for

short
ircuit

Un
solder
the

connected
section

of
each
coil

and
check

the

circuit
with
a
tester
in
the
same

manner
as

described
above

When
the
coil
is
defective

replace
the
coil

Brush
and
brush
lead
wire

Check
the
brush

contact
for

surface
condition
and

wear
When
the

brush
contact
is

loose

replace
the
brush

If
the
brush
is
worn
and

height
is
less

than
6
5

rom

0
2569
in

replace
it

Check
the
connection
of
the
lead

clip
and

lead
wire
for

conditions

Check
brush

holders
and

spring
clip
to

ensure
that

they

are
not
deformed
or
bent
and

properly
hold
brushes

against
the

commutator

If
the
brushes
Of
brush
holders
are

dirty
clean

Brush

spring
tension

Measure
the
brush

spring
tension

using
a

spring
scale
as

shown
in

Figure
EE
14
The

reading
should
be

approxi

mately
0
8

kg
I
76
Ib

EE
6

ENGINE
ElECTRICAL
SYSTEM

l

J
r

@

V

I

Fig
EE
14

Inspection
of
brush

spring
pressure

Armature

assembly

Check
external

appearance
of
the

armature
and
the

commutator

I
Measure
the

armature
shaft
for
bend

using
a

dial

gauge
Replace
the
armature
shaft
if

the
bend

exceeds

0

08
mm
0
0031
in

EE019

Fig
EE
15

Inspection

of
aTmatuTe

shaft
faT
bend

2

Inspect
the

commutator
If
the

surface
of
the

commutator
is

rough
smooth
it

lightly
with

a
No
500

emery
paper
Check
the
commutator
also
for

out
of

round
Ifthe
out
of
round
is
more
than
0
4

mm
0
0157

in
turn
the

commutator
armature
in

a
lathe

so
that
the

out
of
round
is

less
than
0

05

mm
0
0020
in
When

depth
of
mica
from
the
surface

of
commutator

segment
is
reduced
to
less
than
0
2

mm
0

0079
in

under
cut

the

mica
so

that

depth
is
in

range
from
0
5

to
0
8
mm
0
0197

to
0
0315
in

The

wear
limit
of
the

commutator
diameter
is
2
nun

0
0787
in
If

the
commutator
is

worn

excessively
repair

or

replace
it

Fig
EE
16

Inspection
of
commutator

f

L
I
C

9

File

4

J

Round
0
5
to
0
8
rom

Commutator

O

OI97tOO
0315m

S
t

egmen

1l1
Mica

Correct

Incorrect

EE021

Fig
EE
j
7

Undercutting
insulating
mica

3

Inspect
the
soldered
connection
of
armature
lead

and

commutator
If
loose

connection
is
found

resolder

using

rosin

flux

4

Testing
armature
for

ground

Place
one
test

probe
of
a

circuit
tester
on

to
arma

ture

shaft
and
the

other
on
to

each
commutator
bar

If
the

tester
shows

continuity
armature
is

grounded

Replace
the

armature
with
a

new

one

EE
7

ENGINE

EE022

Fig
EE
18

Ground
test

of
armature

5
Check
the

armature
for
short
circuit

by
placing
it

on

an
armature
tester

placing
a
hack

saw
blade
over
the

armature
core
and

by

rotating
the
armature
If
the
saw

blade
vibrates
armature
is
short
circuited

EE023

Fig
EE
19
4
rmature
test

for
short
circuit

6
Check
the

armature
for

continuity
by

placing
probes

of
a
tester
on

two

segments
side

by
side

If
the
tester

shows
no

conduction
the
circuit
is

open

Over

runnmg
clutch

assembly

Check
the

over

running
clutch
for

operation
and

replace
if
the
clutch
is
defective
due
to

slippage
or

dragging

Inspect
the

pinion
assembly
and
sleeve

Slceve
must

slide

freely
along
the
armature
shaft

spline
I

f

damages
are

found
or
there

is
a
resistance
while

sliding
replace
Inspect
the

pinion
teeth
for
excessive

rubbing
and

replace

as

required
Check
the

flywheel
ring
gear
also
for

damage

and
wear

Testing
brush
holder
for

ground

Place
one
test

probe
of
a
circuit
tester
on
to
the
rear

cover
and
the
other
on

to
the

positive
side
brush

holder
If

the

tester
shows
conduction
the
brush
holdcr
is
shorted

to

ground
Replace
the
insulator
or
brush
holder

od

l

Fig
EE
20

GTound
test

of
bTush
holder

Pinion
case

bearing
metal

Inspect
the

bearing
metal
for

wear
and
sidc

play
If
the

clearance
between
the

bearing
metal
and
the

arma
ture

shaft
is

mOTe
than
0
2

mm
0
0079
in

replace
the
metal

Install
a
new

bearing
and

adjust
the
clearance

to
0
03

to

0
10
mm
0
0012
to
0

0039
in

Install
the

bearing
metal

so

that
the
end
of

the

bearing
metal
is

flush
with

gear
case

end

plane

Magnetic
switch

assembly

Inspect
the

magnetic
switch

contact
surface
If
the

contact

surface
is

rough

replace
Replace
the

pinion

sleeve

spring
if

weakened

When

inspecting
the
series

coil

apply
voltagc
8
to

12V
between
Sand
M

terminals
The
series
coil
is
normal

if

the

plunger
is
attracted

When

inspecting
the

shunt
coil
connect
the

S
terminal

M

terminal
and
switch

body
as
shown

in

Figure
EE
21

With
the

plunger
attracted

open
the

M
terminal
The

EE
S

ENGINE
ElECTRICAL
SYSTEM

shunt
coil
is

satisfactory
if
the

plunger
is
attracted

continuously

s

SERIES
COIL

S

SHUNT
COIL

Fig
EE
21

Inspecting
series
and
shunt
coils

When

measuring
the
L

dimension

depress
the

plunger

against
a
wall
and
measure
the

length
L

between

the

adjusting
nut
and

magnetic
switch
cover
as

shown
in

Figure
EE

22
and

adjust
if

necessary

II
L

T

Plunger
L
dimension

31
7
to
32
3
mm
1
248

to
1
272
in

I

11
I
Adjusting
nut

121
Plunger

adjuster

Fig
BE
22

Adjusting
L
dimension

REASSEMBLY

Reassemble
the

starting
motor
in

reverse

sequence
of

disassembly

When

assembling
be
sure
to

apply
grease
to
the

armature
shaft

spline
and

apply
oil
to
the
rear

cover
and

gear
case

bearing
metals
and

pinion
slightly
TEST

Performance

test

The

starting
motor
should
be

subjected
to
no
load

and
lock

torque
tests
whenever

it
has
been
overhauled

to
ensure
that
it

operates
correctly
when
installed
on
the

engine
The

starting
motor
should
also
be

subjected
to

these
tests
when
the

cause
of

abnormal

operation
is

to
be

determined
These
tests
are

summarized
as

follows

No

load
test

Connect
the

starting
motor
in
series
with

the

specified

battery
12
volts

and
an

ammeter

capable
of
indi

cating
1

000

amperes

Specified
current
draw

and
revolution
in
these

tests
are

shown

in

specifications
and
service
data

STARTER

MOTOR

s
SWITCH

o
BATTERY

EtJ

VOLTMETER
AMMETER

EE026

Fig
EE
2J
No
load
test

Torque
test

Torque
testing
equipment
should
be
used

to
measure

the

torque
the
motor
will

develop
A

high
current

carrying
variable
resistance

should
be
connected
to
the

circuit
so
that
the

specified
voltage
at
the

starting

motor

may
be
obtained
since

a
small
variation
in
the

voltage
will

produce
a

marked
difference
in
the

torque

development

Specified
power
voltage
and

torque
are
shown
in

Figure
EE
24

EE
9

ENGINE

Characteristic
curve

i
8

s

l00
0

OJ

m
v

1

2

1
0
tc

0
8
E

u

6
E

o
4

0

2
L

c

0
00
J
300

Current
IAI

Fig
EE
24
Characteristic
curve

of
S
114
B
7M

Diagnoses
of
test

1
Low

speed
with
no
load
and

high
current
draw

may

result
from

following

1

Tight
dirty
or

worn

bearings

2
Bent
armature
shaft

3

Shorted
armature

Check
armature
further

4

Grounded
armature
or
field

Remove

copper
connector
Remove

negative
side
brush

and

insulate
it
from
the
commutator
before

inspection

Using
a
circuit
tester

place
one

probe
on
the

insulated

terminal
and
the
other
on

the
rear
cover
If

the
tester

indicates
conduction

remove
the
other
brush
and
check

field
and

armature

separately
to
determine

whether
the

field
is

grounded
or

armature
is

grounded

2
Failure
to

operate
with

high
current
draw

may
result

from

following

I

Grounded
or

open
field
coil

Inspect
the

connection
and
check
the

circuit

by
the
use

of
a
circuit

tester

2

The
armature
coil
does
not

operate

Inspect
the
commutator
for
excessive

damage
due
to

buring
In
this
case
arc

may
occur
on
defective
commu

tator

during

operating
the

motor
with
no
load

3
Burned

out

commutator
bar

Weak
brush

spring
tension

broken
brush

spring
rubber

brush

thrust
out
of
mica

in
the

commutator
or

a
loose

EE
10
contact

brush
and
commutator
would
cause

burning
of

the

commutator
bar

3
Low

torque
low
current

draw
or
low
no
load

speed

causes

high
internal
resistance

due
to
loose
connections

defective
leads

dirty
commutator
and

causes
listed
on

item
2

3

4

High
no
load

speed
with

low

developed

torque
causes

grounded
field
coil

Replace
the
field
coil
and
check

for

improvement
in

performance

Magnetic
switch

assembly
test

SWITCH

STARTER
MOTOR

61

1u

i
T

0
0118
to

0
0591
n

Fig
EE
25
Circuit

of
magnetic
switch

assembly
test

When
the

starting
motor
is
checked

completely
check

the

magnetic
switch

assembly
Connect

jumper
cables

between
the

negative
battery
terminal
and
the

starting

motor
lM

terminal
the

positive
battery
terminal
and

the

starting
motor
S
terminal

connecting
switch
in

series

as
shown
in

Figure
EE
25

With

the

ignition
switch
on
measure
the

gap
I

between
the

pinion
front

edge
and
the

pinion
stopper
and

adjust
by
changing
the

plunger
L
dimension

if
nec

essary

Gap
l

0
3
to
1
5
mm

0
0118

to
0
0591
in

l

Fig
EE
26
Measurement

of

gap
L

ENGINE

ElECTRICAL

SYSTEM

SPECIFICATIONS
AND
SERVICE

DATA

Specifications

Manual

Automatic

Transmission

Transmission

Make
and

type
HITACHI

SI14
87M
HITACHI
S114
156

Nominal

output
KW

1
0

1
0

System

voltage
V

12
12

Weight
kg
Qb
4

6
10
1
54
11

9

No

load

Terminal

voltage
V

12
12

Current
A

less
than
60
less

than
60

Revolution

rpm
more
than
7

000
more
than
6

000

Load

Terminal

voltage
V
6
3

6
3

Current
A

less
than
420
less

than
420

Torque
kg
m
ft

Ib

more
than
0

9
6
5

more
than
1
0

7
2

Shifting
type
of

pinion
gear

Magnetic
shift

Magnetic
shift

Number
of
teeth
on

pinion

gear
9

9

Service
data

S114

87M

S114
156

Brush

length

Standard

height
mm
in

16

0
630
14

0
551

Wear
limit

mm
in

6
5
0

256
4
5
0

177

Brush

spring
tension

Standard

pressure
kg
Qb
1
6

3
5

0
8
1
8

Commutator

Outer
diameter

Standard
OD

mm
in

33
1

299
33

I
299

Wear

limit
mm
in

2
0

079
2

0
079

Difference
between
maximum

and

minimum

diameters

Repair
limit
mm
in

0
4

0
0157
0
4
0

0157

Repair
accuracy
mm
in

0
05
0
0020

0
05
0

0020

Depth
of
mica

Repair
limit
mm
in

0
2

0

0079
0
2
0

0079

Repair
accuracy
mm
in

0
5

to
0
8
0

5
to
0
8

0

0197

to
0
0315
0
0197
to
0
0315

Clearance

between
arma
ture
shaft
and

bushing

mm
in

Repair
limit

0

2
0

0079
0
2

0
0079

Vi

Repair

accuracy
mm
in

0
03
to
0
1
0
03
to
0
1
1

r

0

0012
to
0
0039

0
0012
to
0
003Q

EE

11

ENGINE

Arma
ture
shaft

Outer
diameter

Pinion
side
mm
in
12

950
to
12
968

0

5082
to
0

5105

11

450
to
II

468

0
4507
to
0
4515

0

1
0

0039

0
08
0
0031
Rear
end
mm
in

Wear
limit

Bend

limit
mm
in

mm
in

Gap
1
between
the

pinion
front

edge

and
the

pinion
stopper
mm
in
0
3
to
1
5

0
0118
to

0
0591

Magnetic
switch

Coil
resistance

Series
cuil
Q

Shunt
coil
n

Plunger
L
dimension
mm
in
0
3
at
20De

68UF

0
9
at
ooe
680F

317t032
3

l
248
to
1
272

TROUBLE

DIAGNOSES
AND

CORRECTIONS
12
950
to
12
968

0
5082
to
0
5105

11

450
to
II

468

0
4507
to
0
4515

l

0
1

0
0039

0
08

0
0031

0
3
to
1
5

0

0118
to
0

0591

0
3

at
20De

680Fl

0
9
at
200e
680F

317
to
32
3

l
248
to
I
272

Troubles
Trouble
location
Causes
Remedies

Starting
motor
will
not

operate

No

magnetic
switch
Battery
Defective

battery
Replace
battery

operating
sound

Over
discharging
Measure

specific
gravity

of

e
Ie

ctrolyte
and

ch
lrge
or

replace
the

battery

Ignition
switch
Defective
contact
Correct

or

replace
ig

nition
switch

Wiring
Faulty
starting
motor

grounding
Correct

Faulty
battery
grounding
Correct

Broken
or
disconnected
cable
Correct

or
replace

EE

12