ignition DATSUN B110 1973 Service Owner's Manual

ENGINE

4
Install

a

timing
light
on
No

cylinder
spark

plug

wire
and
install

a
tachometer

5

Set

idling
speed
to

approximately
800

rpm

6

Check

ignition
timing
if

it
is
50BTDC
Before

Top
of

Dead
Center

by
the

use
of

timing
light

If

necessary
adjust
it

as
follows

Loosen
set
screw
to
such
an
extent
that

distributor
can

be
moved

by
hand

2

Adjust
ignition
timing
to
50BTDC

3

Lock
distributor

set
screw
and
make
sure
that

timing

is
correct

Fig
ET
9

Checking
ignition
timing

Ignition
timing
degree
50
B
T
D
C

Checking
or

replacing
distributor

breaker

point
condenser
and

spark

plugs

Distributor
breaker

point

Check
distributot
breaker

points
for
abnormal

pitting

and
wear

Replace
if

necessary
Make
sure

they
are
in

correct

alignment
for
full
contact
and
that

point
dwell

and

gap
are
correct
Clean
and

apply
distributor

grease

to
earn
and
wick

Note
Do
not

apply
grease
excessively
Distributor

Point

gap
0
45
to
0
55
mm

0
018

to
0
Q22
in

49
to
55

degrees
Dwell

angle

ET004

Fig
ET
10

Checking
distributor

point
gap

Condenser

I

Clean
outlet
of
condenser
lead

wire
and
check
for

loose

set
screw

Retighten
if

necessary

2

Check
condenser

capacity
with
a

capacity
meter

Condenser
insulation
resistance

may
be
also
checked

using
a

tester

by
adjusting
its

range
to
measure

large

resistance
value
When
condenser
is
normal
the

tester

pointer
swings
largely
and

rapidly
and
moves

gradually

back

to
the

infmite
side
When
the

pointet
does

not

stay
still
or
it

points
zero
in
resistance

replacement
is

necessary

Condenser

capacity

0

221LF
Micro
Farad

Condenser
insulation
resistance

5
Mn

Mega
ohms

Spark

plugs

Remove

and
clean

plugs
in

a
sand
blast
cleaner

Inspect

each

spark
plug
Make
sure
that

they
are
of
the

specified
heat

tange
Inspect
insulator
for
cracks
and

chips
Check

both
center
and

ground
electrodes
If

they
are

excessi
ely
worn

replace
with
new

spark

plugs
File
center
electrode
flat

Set
the

gap
to
0
8
to

0

9
rom
0

031
to
0
035
in

using
the

proper

adjusting

tool

Tighten
plugs
to

1
5
to
2
0

kg
m
11
0
to
15
0

ft

lb

torque

ET
6

EMISSION
CONTROL
AND

TUNE
UP

Fig
ET
11

Checking
spark
plug
gap

Checking
distributor

ignition
wiring

and

ignition
coil

Distributor

Check

centrifugal
advance
unit
for
loose
connection

or

improper
operation

If
it
is
not

operating

properly
the
trouble

may
be
due

to
a

sticky
spring
or

excessively
worn

parts

This

operation
needs
a
distributor
tester
As
to

inspection
procedure
and
reference
data
refer

to

relative

topic
under
Distributor
in
Section
EE

Page

EE
32

If
vacuum
advance
mechanism
fails
to

operate

proJr

erly
check
for
the

following
items
and
correct
the

trouble
as

required

1

Check
vacuum
inlet
for

signs
of

leakage
at
its

connection
If

necessary
retighten
or

replace
with
a

new
one

2

Check
vacuum

diaphragm
for
air
leak

If
leak
is

found
replace

diaphragm
with
a

new
one

3

Inspect
breaker

plate
for
smooth

moving

If

plate
does
not
move
smoothly
this
condition
could

be
due
to

sticky
steel
balls
or

pivot

Apply
grease
to
steel
balls
or

if

necessary
replace

breaker

plate
as
an

assembly

For
vacuum
advance
characteristics
refer
to
Distribu

tor
in

Section
EE

Page
EE
32

Ignition
wiring

Use
an
ohmmeter
to
check
resistance
of
secondary

cables
Disconnect
cables
from

spark
plugs
and
install

the

proper
adapter
between
cable
and

spark
plug
Remove

distributor
cap
from
the
distributor

with

secondary
cables
attached
Do
not
remove
the
cables

from
the

cap

Check
the
resistance
of
one

cable
at
a
time

Connect
the
ohmmeter
between

the

spark
plug
adapter

and

the

corresponding
electrode

inside
the

cap
If

resistance
is

more
than
30

000
ohms
remove
the
cable

from
the

cap
and
check
cable
resistance

only
If
the

resistance
is
still

more
than
30
000
ohms
replace
cable

assembly

T

I

II

Fig
ET
12

Checking
high
tension
cables

Ignition
coil

Check

ignition
coil

for

appearance
oil

leakage
or

performance
For
details
refer
to
Section
EE

Page

EE36

Checking
distributor

cap
and
rotor

Note
This

operation
is
to
be

performed
while

chekcing

distribuotr

points
Inspect
distributor

cap
for

cracks
and
flash
over

External
surfaces
of
all

parts
of

secondary
system
must

be
cleaned
to
reduce

possibility
of

voltage
loss
All
wires

should
be
removed
from
distributor
cap
and
coil

so
that

terminals
can
be

inspected
and
cleaned
Burned
or

corroded
terminals
indicate
that
wires
were
not

fully

seated
which

causes
arcing
between
end
of
wire

and

terminal
When

replacing
wires
in

terminal
be
sure

they

are

fully
seated
before

pushing
rubber

nipple
down
over

tower

Check
distributor
rotor
for

damage
and
distributor

cap
for
cracks

ET
7

ENGINE

Adjusting
carburetor
idle

rpm

mixture
ratio

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
NO

position
for
automatic
transmission

4
Check

ignition
timing
if

necessary
adjust
it
to
the

specifications

Ignition
timing
SO

800

rpm

S

Adjust
idle

adjusting
screw
so
that

CO

percentage
is

1
5
t
O
S

6

Repeat
the

adjustments
as
described
in

steps
3

and

S

above
so
that

CO

percentage
is
I
i
t
O

S
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

CO

percentage

with
lever
in

D

position
6S0

I
S
t
O
S

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
idle

adjusting
screw

completely
to
avoid

damage
to

the

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

Idle

adjust

ing
screw

3
Idle

limitter

cap

4

Stopper

Fig
ET
13
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
re

adjust
it

at

the

time
of

installation
To

adjust
proceed
as
follows

L
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

CO
RICH

direction

CARB
STOPPER

J

Z

3
8
ROTATION

0

IDLE
LIMITER
CAP

0
to
RICH

CO
LEAN

Fig
l
T
14

Setting
idle
limiter

cap

ET
8

EMISSION
CONTROL
AND

TUNE
UP

Checking
and

adjusting
dash

pot

automatic
transmission
model

only

Check

operation
of
dash

pot
It
should

not
be
cracked

or

bound
It

is
also
essential
to
check
to
be
certain

that
it

is
in

correct

adjustment

L
Check
to
be
sure
that
dash

pot
contacts

stopper
lever

when

engine
speed
reaches
1
900

to
2

000

rpm

2

Engine
should
be
slowed
down
from
3

000
to
1

000

rpm
within
a
few

seconds

Readjust
dash

pot
or

replace
it
with
a
new
one
if
it

fails

to
meet

the
above

conditions

Checking
carburetor
return

spring

Check
throttle
return

spring
for

sign
of

damage
wear

or

squareness
Discard

spring
if
found
with

any
of
above

excessively
beyond
use

Checking
choke
mechanism

choke
valve
and

linkage

1

Check
choke
valve
and

mechanism
for
free

operation

and
clean
or

replace
if

necessary

A

binding
condition

may
have

developed
from

petro

leum

gum
for
motion
on
choke
shaft
or

from

damage

2

Check
bimetal
cover

setting
position
The

index
mark

of
bimetal
cover
is

usually
aligned
at
the

middle

point
of

the
scale

Note
When
somewhat
over
choked
turn
bimetal

caver

clockwise

slightly

3
Prior
to

starting
check
to
be
sure
that

choke
valve

closes

automatically
when

pressing
down
on
accelerator

pedal

Should
it
fail
to
close

automatically
the
likelihood
is

that
fast
idle
cam
is
out
of

proper

adjustment
or

that

bimetal
is

not

properly
adjusted
calling
for

adjustment

Refer
to
Carburetor
in
Section
EF

Page
EF
15
Checking
anti

dieseling
solenoid

If

engine
will
not

stop
when

ignition
switch
is
turned

off

this
indicates

a

striking
closed
solenoid
valve

shutting
off

supply
of
fuel
to

engine
If
harness
is
in

good

condition

replace
solenoid
as
a
unit

To

replace
proceed
as
follows

Removal

and
installation

of
anti

dieseling
solenoid

Removal

Solenoid
is
cemented

at

factory
Use

special
tool

STl
91
50000
to
remove
a

solenoid

When

this
tool
is

not
effective
use
a

pair
of

pliers
to

loosen

body
out
of

position

lnstalltion

I
Before

installing
a
solenoid
it
is

essential
to
clean

all
threaded

parts
of
carburetor

and
solenoid

Supply

screws
in
holes
and
turn
them
in

two
or

three

pitches

2
First
without

disturbing
the
above

setting
coat
all

exposed
threads
with
adhensive
the

Stud
Lock
of

LOCTlTE
or

equivalent

Then

torque
screws
to
35
to
55

kg
cm
30

to
48
in

lb

using
a

special
tool
STl9150000

After

installing
anti

dieseling
solenoid
leave
the
carbu

retor
more
than
12

hours
without

operation

3

After

replacement
is
over
start

engine
and
check

to
be
sure
that
fuel
is
not

leaking
and
that
anti

dieseling
solenoid
is
in

good
condition

Notes
a
Do
not
allow
adhesive

getting
on
valve

Failure
to
follow
this
caution
would
result
in

improper
valve

performance
or
clogged
fuel

passage

b
I
n

installing
valve
use
caution
not
to
hold

body
directly
Instead

use

special
tool

tighten

ing
nuts
as

required

ET
9

EMISSION

CONTROL
AND
TUNE
UP

Ignition
switch

0

Speed
switch

Ignition
switch

6

Transmission
A12

Engine
with
Manual
Transmission

l

Battery

J

Below
10

mph

switch

ON
To
throttle

opener

Servo

diaphragm

Needle
valve

To
air
cleaner
To

intake

manifold

f

Vacuum
control

valve

p

Throttle

opener

noid

ON
Car

speed
below
16
km
h
10
MPH

OFF

Car

speed
above
16
km
h
10
MPH

A12

Engine
with
Automatic
Transmission

Inhibitor
switch
1

J
Battery

To
intake

manifold

t

ET
11
OFF
ON

Fig
BY
16

Schematic

drawing
of
throttle

opener
system
To
throttle

opener

Servo

diaphragm
Vacuum
control

valve

P

Throttle

t
opener

solenoid

7
7

ON
transmission
in
N
and
P

positions

OFF
Transmission
in
0

position

ENGINE

Gear
Vacuum
advance
Note

R
No

1st
No

2nd
No

3rd
No

4th
Yes
Immediately
after

starting
the

engine
in
cold

weather
vacuum
advance
is
available

for
all

gear

positions

A12

Engine
with
Manual
Transmission

Distributor

Ignition
switch

8

1

J
Battery
Thermo
switch

9

Transmission

L

r
l

r
Vacuum
advance
unit

To
carburetor

Needle

valve

OFF

l
To
air
cleaner

ON

Vacuum

cutting
valve

solenoid

Top
switch

Top
off
I

7
1

OFF
Vacuum
actuated

ON
Vacuum
eminated

into

atmosphere

Fig
ET
28

Schematic

drawing
of
transmission
controlled
vacuum

advance

system

When

electric
current
flows

through
the

vacuum

cutting
valve

solenoid
the
needle
valve

opens
and
intro

duces
air
from
the
air
cleaner
into
the
vacuum
advance

unit

of
the
distributor

through
the

vacuum
hose
and
the

vacuum
advance
is
eliminated
When
the
vacuum

cutting

valve
solenoid
is

deenergized
the

needle
valve

closes
and

the
vacuum
created

by
the
carburetor
is

introduced
into

the

vacuum
advance
unit
of
the
distributor
to

provide

usual
vacuum
advance

The

Top
switch
located

on
the
transmission
case

operates
so
as

to

interrupt
the
flow

of
electric
current

when
the

gear
is

placed
into

Top
but

allows
it

to
flow

in

other

gear
positions

Fig
ET
29

Top
switch
installation

ET
18

EMISSION
CONTROL
AND
TUNE
UP

SERVICE
DATA
AND

SPECIFICATIONS

Valve

clearance

Hot
Intake

Exhaust
mm
in

rom

in

rom
in

kg
lb
0
35
0
014

0
35
0
014

10
to
15
0
394
to
0
591

10
22

Fan
belt
tension

Tightening
torque
Cold

Cylinder
head
bolts

kg
m

ft
lb

1st

turn

2nd
turn

Re

tightening
torque
Hot

Manifold
nuts

Carburetor
nuts
4
0

to
4
5

29
to
33

5
5

to
6
0
40

to
43

6
0

to
6
5
43

to
47

0
9

to
I
4

6
5
to
10

0
5

to
1
0
3

6
to
7
2

1
5

to
2
0
II
to
14

Spark
plugs

Oil

capacity
of

engine
including
oil
ftIter

Maximum
L

US

gal
Imp
gal

L

US

gal
Imp
gal
3
3

U
14

2
3

Ii
Minimum

Water

capacity
of

cooling
system

Without
heater

L
US
gal

Imp
gal

With
heater

L

US

gal
Imp
gal
4
2
1

U

4
9

I
4
11

12
5

to
14
5

I78
to
206
350

Compression
pressure
at

rpm
kg
em

psi

Battery
specific
gravity

Permissible
value
Fully
charged
value

at
200C
680F

Frigid
climates

Tropical
climates

Other

elima
tes
Over
1
22

Over
1
18

Over
1
20
1
28

1
23

1
26

Ignition
timing
degree

Distributor
50
B
T
D
C

Condenser

capacity
mm
in

degrees

IlF
Micro
Farad
0
45
to

0
55
0
018

to
0
022

49
to
55

0
22

5
Point

gap

Dwell

angle

Condenser
insulation
resistance
Mil

Mega
ohms

ET
25

EMISSION
CONTROL
AND

TUNE
UP

Trouble

shooting
procedure
on

starting
circuit

Switch

on
the

starting
motor

with

light
put
on

When

light
goes
off
or
dims

considerably

a
Check

battery

b
Check
cable
for
connection

c

Check
starter
motor

When

light
stays
bright

a
Check

wiring
connection
between

battery

and
starter
motor

b

Check
starter
switch

c
Check
starter
motor

ENGINE
WILL
CRANK
NORMALLY
BUT
WILL
NOT
START

In

this
case

following
trouble
causes

may
exist
In

the
most
causes

ignition
system
or

fuel

system
is
in
trouble

Ignition
system
in

trouble

Fuel

system
in
trouble

Valve
mechanism
does
not

work

properly

Low

compression

Check

spark
plug
first
in
accordance

with
the

following

procedure

Disconnect

high
tension

cable
from
one

spark
plug
and
hold

it

about
10
rom

0
4
in

away
from
the

engine
metal

part
and

crank
the

engine

Good

spark
occurs
a
Check

spark
plug

b
Check

ignition
timing

Check
fuel

system

d
Check

cylinder
compression

No

spark
occurs
Check

the
current
flow

in

primary
circuit

Very
high
current

Inspect
primary
circuit
for
short

Check
breaker

point
for

operation

Low

or
no
current
Check
for
loose
terminal
or
disconnection

in

primary
circuit

Check
for

burned

points

Ignition
system
in
trouble

Burned
distributor

point
Repair
or

replace

Improper
point
gap
Adjust

Defective

capacitor
Replace

Rotor

cap
and
rotor
leak

Replace

ET
27

ti

ENGINE

Defective

spark
plug

Improper
ignition
timing

Defective

ignition
coil

Disconnection
of

high
tension

cable

Loose
connection
or
disconnection
in

prima

ry
circuit

Lack
of
fuel

Dirty
fuel
strainer

Dirty
or

clogged
fuel

pipe

Fuel

pump
will
not
work

properly

Carburetor

auto
choke
will
not
work

prop

erly

Improper
float
level

adjustment

Improper
idling

Dirty
or

clogged
carburetor

Damaged
anti
dieseling
solenoid

Clogged
breather

pipe

Incorrect

spark
plug
tightening
or
defective

gasket

Improper
grade
engine
oil

or

viscosity
drop

ping

Incorrect
valve
clearance

Compression
leak
from
valve
seat

Sticky
valve
stem

Weak
or

defective
valve

springs

Compression
leak
at

cylinder
head

gasket

Sticked
or
defective

piston
ring

Worn

piston
ring
or

cylinder

Troubleshooting
procedure

Pour

engine
oil
from

plug
hole
and

then
measure
cylinder
compression
Clean

adjust
plug
gap
or

replace

Adjust

Replace

Replace

Repair
or

replace

Supply

Replace

Clean

Repair
or

replace

Check
and

adjust

Correct

Adjust

Disassemble
and

clean

Replace

Clean

Tighten
to
normal

torque
or
replace

spark
plug
assembly

Replace
with

proper
grade
oil

Adjust

Remove

cylinder
head
and

lap
valves

Correct
or

replace
valve

Replace
valve

springs

Replace
gasket

Replace

piston
ring

Overhaul

engine

Compression
increases
Trouble
in

cylinder
or

piston
ring

Compression
unchanged
Compression
leak
from
valve
cylinder

head
or
head

gasket

ET

28

IMPROPER
ENGINE

IDLING

Fuel

system
in

trouble

Low

compression

Others

Ignition
system
in
trouble

Engine
idle
too
fa
t

ENGINE
POWER
NOT

UP
TO
NORMAL

4
w

compression

Ignition

system
in

trouble

Fuel

system
in
trouble
EMISSION
CONTROL
AND
TUNE
UP

Clogged
or

damaged
carburetor

jets

Incorrect

carburetor

adjustment
idle

speed

idle
mixture

Clogged
air

cleaner

Defective

gaskets
of
manifolds
or

carburetor

insulator

Improper
float
level

adjustment

Incorrect
valve
clearance

Extremely
low
revolution

Incorrect
basic

ignition
timing

Incorrect
automatic

teinperature
control
air

cleaner

Defect
or
malfunction
of

ignition
system

spark
plug
high
tension
cable
breaker

point
ignition
coil
etc

Trouble
in
throttle
link
and
cable

Incorrect
throttle

opener

adjustment

Trouble
in

PCV
valve

Trouble
in
automatic

choke

Defect

or
malfunction
of

ignition
system

spark
plug
high
tension
cable

breaker

point
ignition
coil
etc

Incorrect

ignition
timing

Defective

spark
plugs

Defective
distributor

points

Malfunction
of
choke

system

Clogged
fuel

pipe

ET
29
Clean
or

replace

Adjust
idle

speed
mixture

Replace
element

Replace

gasket

Adjust

Previously
mentioned

Adjust

Adjust
idie

rpm

Adjust
ignition
timing

Adjust
automatic

temperature
control

air
cleaner

Adjust
or

replace
ignition
system

Check
throttle
link
and
cable

Adjust
throttle

opener

Replace
PCV
valve

Adjust
automatic
choke

Adjust
or

replace

ignition
system

Previously
mentioned

Adjust

Clean

adjust
or

replace
plugs

Dress
or

replace
points
Check
con

denser

Adjust

Clean