DATSUN B110 1973 Service Repair Manual

ENGINE
ElECTRICAL
SYSTEM

BATTERY

CONTENTS

REMOVAL

CHECKING
ELECTROLYTE
LEVEL

CHECKING
SPECIFIC
GRAVITY
EE
1

EE
l

EE
1

REMOVAL

Disconnect
the

negative
terminal

first
and
then

the

positive
terminal

2
Remove
the
retainer
nuts
and
take
off

retainer

3
Release

retainer
bolts
and

remove

battery

CHECKING

ELECTROLYTE
LEVEL

Adjust
the

electrolyte
level
in
the

battery
when
the

battery
is
in
a

fully
charged
condition
The

electrolyte

hould
maintain
its
indicated

correct
level

in
the

battery

N
water
other
than

distilled
water
should
be
added

Q

cD

I

1
Vent

plug

2

Electrolvte

3
Level
indicator

Fig
EE
1

ElectTolyte
level

CHECKING
SPECIFIC
GRAVITY

The

specific
gravity
of
the

battery
liquid
is
measured

by
means
of
a

hydrometer
When

according
to

the
table

described

later
the

charging
of

the

battery
is
below

60

percent
the

specific
gravity
is
below
1

20
as
corrected

at

200e
680F
and
also

when
the
difference
in

the

specific
CHARGING

BATTERY
FREEZING
EE
2

EE
3

gravity
of

the
individual
cells
is
above
0
025
the

battery

must
be

changed
or

adjusted

tl

f

ead

p
level

jSCale
2

II

It
I
TheTmat

gauge

I
2

Hydrometer

Fig
EE
2

Checking
specific
gTavity

Temperature
conversion
in

measuring

specific
gravity

The
standard

specific
gravity
of
the

electrolyte
is

obtained
when
the

battery
is

fully
charged
at
an
electro

lyte
temperature
of
200

e
680
F

When

temperature
rises
loe
1
80F
the

specific

gravity
decreases
0

0007
and

reversely
when

temperature

drops
loe
I
ROF

the

specific
gravity
increases

0
0007

Therefore

assuming
the

specific
gravity
at
tOe
is

St

S20

the

specific

gravity
at
200e
680F

is
calculated

according
to

the

following

expressions

S

o
St

0
0007
t
20

If
0

0007
t
20
is
X

S

o
St
X

Accordingly
if
X
is
known
beforehand
S

o
can
be

obtained

easily
The
values
of
X

are
shown
in
the

following
table

EE
1

ENGINE

Temperature

Oc
of
Temperature

C
F
x
Temperature

Oc
F
x

0
32
0
0
014
14
572
28

82
4

0

004
0

006

33
8
IS
59
0
19

I
84
2

0
013

2

35
6
16
60
8

0
003
30
86
0

0
007

3

37
4
0
012
17
61
6

0
001
31
87
8

0
008

4

39
2
18
64
4

32
89
6

0
011

0
001

5
41
0
19

66
2

33
91
4
0
009

6
42
8
0

010
20
68
0

0
34
93
2
0
010

7
44

6
0
009
21
69
8
35
95
0

0
001
0
01l

8
46
4
22
71
6
36
96
8

0
008

9
48
2
23

73
4
0

002
37
98

6
0
012

10
50
0
0
007
24

75
2

0
003
38
100
4

0
013

II

51
8
25

77
0

39
t02
2

0
006

0
004

12
53
6

16
78
8
40

104
0

0
Ot4

13
55
4
0

005
27
80
6
0

005

The
state

of

discharge
of

the

battery
can
be
determined

by
checking
the

specific
gravity
according
to
the
follow

ing
table
The

electrolyte
level
should
be

satisfactory

U

tn

l

k
1

I
P

I

IZf

I
r7

42
I

bt
7

J
I
I

11
0

I
M
I

L
J
I

10
20
30
0
50

60
70
aD
90

100

Charging
condition

Fig
EE
3

Charging
condition

CHARGING

When
the

specific
gravity
of
he

electrolyte
is

below

1

20
with

the

electrolyte
level

being

satisfactory
it
is

necessary
to

recharge
the

battery
Whenever
a

quick
x

Converted

specific
gravity
520

V

9d

f

o
1

28

u
1
6

c

E

1
24

l
22

o

0

U5

S

I

1

1
2

1
10

1

NON
M

i

Electrolyte

temperature
lOCI

charge
is
carried
out
the

negative
terminal
of
the

battery
must
be
disconnected
The
corroded
terminal

posts
of
the

battery
should
be
cleaned
with
warm

water
of

bicarbonate

of
soda
solution

prior
to

charging
The

following

points
should
be
observed
in

charging

If
the
electrolyte
level
is

below
the

plates
add

distilled
water

2
Remove
all
the
vent

plugs
and

keep
them

at
a

particular
place

3

Keep
the

electrolyte

temperature
below
450C

l130F
during
charging

4

During
charging
the

voltage
increases

gradually
until

it

reaches
the

particular
maximum
value
2
5

Vice
II
The

charging
is

completed
when
this
value

stays
almost

constant
for
more
than
one
hour
and
all
cells

gas
freely

EE
2

ENGINE
ElECTRICAL
SYSTEM

5

If
the

specific

gravity
is
above
1
260
200C
or
680F

after

charging
adjust
it

by
adding
distilled
water

6

Keep
any
open
flame

away
from
the

place
where
the

battery
is

being

charged

7

Replace
vent

plugs
and
clean
the

upper
face
of
the

battery
after

charging

BATTERY

FREEZING

Temperatures
at
which

battery

electrolyte
freezes

vary

with

acid
concentration
or
its

specific

gravity
A

battery

with

an
insufficient

state
of

charge
will

freeze
at
lower

temperatures
If

specific

gravity
of
a

battery
falls
below

I
I

the
indication
is
that
the

battery
is

completely

discharged
and
will

freeze

readily
when

temperatures
fall
below

freezing

point

Note
Use
extreme
caution
to
avoid

freezing

battery
since

it
will

usually
ruin
the

battery

o

I

I
1

G
10

I

1
o

i
20

I

u
30

I
I
0

40

I
0

SO

I

60

0

I
E

f
o

70

I

80

1
00

1
04
1
08
I
12

1
16
20

24
1

28
1
32

E

E004

Specific
gravity
of

electrolyte

Fig
EE
4

FTeezing
point
of
electrolyte

STARTI
NG

MOTOR

CONTENTS

OPERATION

CONSTRUCTION

REMOVAL

DISASSEMBL
Y

CLEANING
AND

INSPECTION

Terminal

Field
coil

Brush
and
brush

lead
wire

Brush

spring
tension

Armature

assembly

Over

running
clutch

assembly

Testing
brush

holder
for

ground
EE
3

EE
4

EE
4

EE

5

EE
6

EE
6

EE

6

EE

6

EE
6

EE
7

EE
8

EE
8

OPERATION

The

purpose
of
this

starting
system
is
to
crank
the

engine

When
the

ignition
switch
is
set

to
start
current
flows

through
the
series

and
shunt

coils
of
the

solenoid
and
Pinion

case

bearing
metal

Magnetic
switch

assembly

REASSEMBL

Y

TESr

Performance
test

Diagnoses
of
test

Magnetic
switch

assembly
test

SPECIFICATIONS
AND
SERVICE
DATA

Specifications

Service
data

TROU8LE

DIAGNOSES
AND

CORRECTIONS
EE
8

EE
8

EE
9

EE
9

EE
g

EE
10

EE
10

EE
11

EE
11

EE

11

EE
12

thus
the

solenoid
is
excited
The

plunger
is

pulled
into

the
solenoid
so
that

it

operates
the
shift
lever
to

engage

the
drive

pinion
with

flywheel
ring

gear
and

the

magnetic

switch
is

closed

EE
3

When

the
contacts

stationary
and

movable
are
dused

the
motor

operates
to
crank
the

engine
and
the
series

coil
of
the
solenoid
is
cut
out
The

magnetic
force
of
the

shunt
coil
is

sufficient
to
hold
the

pinion
in
mesh
after

shifting
the

system

When
the

engine
is

operated
and
the

ignition
switch
is

set
to
ON
the
series
coil

demagnetizes
the
shunt

coil
and
the
return

spring
actuates
the

plunger
to
return

to
the

original
position
Consequently
the

motor

stops

More

positive
meshing
and
demeshing
of
the

pinion
and

the

ring
gear
teeth

are
secured

by
means
of
the
over

running
clutch
The

over

running
clutch
employs
a
shift

lever
to

slide
the

pinion
along
the

armature
shaft
so
as
to

engage
or

disengage
with
the

ring
gear
teeth
The

over

running
clutch
is

designed
to
transmit

driving
torque

from
the

motor
armature
to
the

ring
gear
and

to

permit

the

pinion
over

running
the

armature
when
the

engine
is

started
ENGINE

ijJ

1

t

2

3

4

5

6

7
Stationary
contact

Serie
coil

Ignition
switch

Solenoid

Shunt
coil

Plunger

Return

spring
8

Shift
lever

9
Drive

pinion

10

Ring
gear

11
Pinion
sleeve

spring

12

Armature

13
Movable

contactor

14

Battery

Fig
EE
5

Starting
motor
circuit

CONSTRUCTION

1

2

3

4

5

6

7

8

9

10

11

12

13
j
@

Gear
case

Du
t
cover

Shift
lever

Dust
cover

Shift
lever

pin

Magnetic
switch

Center
bracket

Armature

Thrust
washer

Metal

Stopper
washer

Stopper
l

lip

Pinion

stopper
@

@

o

@
i
1I
@
@
@

14

15

t6

17
Pinion

Over

running
clutch

Field
coil

Yoke
18
B
rush
cover

19

Brush

20
Rear
cover

21

Through
bolt

Fig
EE
6

Exploded
view

of
staTting
motoT
SI14
B7M

Disconnect
the

black
and

yellow
wire
from
the

magnetic
switch

terminal
and

black

battery
cable
from

the

battery
terminal
REMOVAL

I
Disconnect
the

ballery
ground
cable

EE
4

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