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Page 405 of 513

DATSUN B110 1973 Service User Guide
ENGINE

AD
JUSTMENT

Idling
adjustment

Idle

mixture

adjustment
requires
the

use
of
a
CO

meter
When

preparing
to

adjust
idle
mixture
it
is

essential
to
have
the

meter

thorough

ENGINE

AD
JUSTMENT

Idling
adjustment

Idle

mixture

adjustment
requires
the

use
of
a
CO

meter
When

preparing
to

adjust
idle
mixture
it
is

essential
to
have
the

meter

thoroughly
warmed
and

calibrated

Warm

up
the

engine
sufficiently

2
Continue

engine
operation
for
one
minute
under

idling
speed

3

Adjust
throttle

adjusting
screw
so
that

engine
speed

is
800

rpm
in
N

position
for

automatic
transmission

4
Check

ignition

timing
if

necessary
adjust
it
to

the

specifications

Ignition
timing
50
800

rpm

5

Adjust
idle

adjusting
screw
so
that
ca

percentage
is

1
5
t
0
5

6

Repeat
the

adjustments
as

described
in

steps
3

and

5

above
so
that
ca

percentage
is
1
5

to
5
at
800

rpm

Cautions
a
On
automatic
transmission

equipped

model
check
must
be
done
in
the
0

position
Be
sure
to

apply
parking
brake
and

to
lock
both
front
and

rear
wheels
with
wheel

chocks

b
Hold
brake

pedal
while

stepping
down

on

accelerator

pedal
Otherwise
car
will
rush
out

dangerously

7
On
automatic
transmission

equipped
model
make

sure
that
the

adjustment
has
been
made

with
the
selector

lever
in
N

position

And
then
check
the

specifications
with

the
lever
in

D

position
Insure
that
CO

percent
and
idle

speed
are
as

follows

Idle

rpm
650

ca

percentage

with

lever
in
D

position
15
to
5

If

necessary
adjust
by

progressively
turning
throttle

adjusting
screw
and
idle

adjusting
screw
until
correct

adjustments
are

made

Notes
a
Do
not

attempt
to
screw
down
the
id
Ie

adjusting
screw

completely
to
avoid

damage
to
the

EF
14
tip
which
will
tend
to
cause
malfunctions

b
After
idle

adjustment
has
been
made
shift
the

lever
to
N
or
p

position
for
automatic

transmission

c

Remove
wheel
chocks
before

starting
the
car

Throttle

adjusting

screw

2
Idle

adjust

ing
crew

3
Idle
limiter

cap

4

Stopp
r

Fig
EF
23
Throttle

adjusting
screw
and
idle

adjusting

screw

Idle
limiter

cap

Do
not
remove
this

idle
limiter

cap
unless

necessary

If
this
unit
is

removed
it
is

necessary
to

fe

adjust
it
at

the
time

of
installation
To

adjust
proceed
as
follows

1
Make
sure
that
the

percentage
of

CO
contents

satisfies
the

specifications

2

Install
idle
limiter

cap
in

position
making
sure
that

the

adjusting
screw

can
further
turn
3

8
rotation
in
the

Ca
RICH
direction

j
j
Carburetor

stopper

o

u

o

i

r
3
8
rotation

0

0

Idle
limiter

cap

0
0

CO
lean

Fig
EF
24

Setting
idle
limite

cap

Page 424 of 513

DATSUN B110 1973 Service User Guide
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

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

Page 425 of 513

DATSUN B110 1973 Service User Guide
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

DISASSE

Page 430 of 513

DATSUN B110 1973 Service User Guide
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

Diagn

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

Page 432 of 513

DATSUN B110 1973 Service User Guide
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

Page 434 of 513

DATSUN B110 1973 Service User Guide
Pinion
intermeshes

with

ring
gear

Starting
motor

rotates

and

pinion
intermeshes

with

ring
gear
but
ro

tation
is

too
slow

When

starting
switch
is

set
to
OFF
the
start

ing

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