1973 DATSUN B110 ignition

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

Air
intake

system
in

trouble

Overheating

Overcooling

Others

NOISY

ENGINE

Car

knocking

Car
knock
when

coasting
ENGINE

Diny
ur

clogged
fuel
strainer

Fuel

pump
will
not
work

properly

Clogged
carburetor

jets

Clogged
air
cleaner

Air

inhaling
from
manifold

gasket
or
carbu

retor

gasket

Insufficient
coolant

Loosened
fan
belt

Worn
or
defective
fan
belt

Defective
thermostat

Defective
water

pump

Clogged
or

leaky
radiator

Defective
radiator
filler

cap

Air

mixing
into

cooling
system

Improper
grade

engine
oil

Incorrect

ignition
timing

Defective
carburetor

lean
mixture

Defective
thermostat

Low

octane
fuel

Improper
tire

pressure

Dragging
brake

Slipping
clutch

Overloading
to

engine

Carbon

knocking

Timing
knocking

Fuel

knocking

Preignition
misusing
of

spark
plug

Incorrect
throttle

opener
adjustment

Trouble
in
PCV
valve

ET
30
Replace

Repair
or

replace

Disassemble
and
clean

Replace
element

Replace
gasket

Replenish

Adjust

Replace

Replace

Replace

Flush

repair
or

replace

Replace

Retighten
each

part
of

cooling
system

Replace
with

proper
grade
oil

Adjust

Overhaul
carburetor

Replace

Replace
with

specified
octane
fuel

Adjust
to

the
specified

pressure

Adjust

Adjust

Use

right

gear
in

driving

Disassemble
cylinder
head
and
remove

carbon

Adjust
ignition
timing

Use

specified
octane
fuel

Use

specified
spark
plug

Adjust
throttle

opener

Replace
PCV
valve

EMISSION
CONTROL
AND

TUNE
UP

Mechanical

knocking

Crankshaft

bearing

knocking

Connecting
rod

bearing

knocking

Piston
and

cylinder

noise

Piston

pin
noise

Water

pump
noise

Others
Defect
or

malfunction
of

ignition
system

spark
plug
high
tension
cable
breaker

point
ignition
coil
etc

This

strong
dull
noise
increases
when
the

engine
is
accelerated
To
locate

the

place

calise
a
misfire

on
each

cylinder
If
the
noise

stops
by
the

misfire
this

cylinder
generates

the
noise

This
is
a
little

higher
pitched
noise

than
the

crankshaft

knocking
and
also
increases

when
the

engine
is
accelerated
Cause
a

misfire
on
each

cylinder
and
if
the
noise

diminishes
almost

completely
this
crank

shaft

bearing
generates
the

noise

When

you
hear
an

overlapping
metalic
noise

which
increases
its

magnitude
with
the
revo

lution
of
the

engine
and

which
decreases
as

the

engine
is

warmed

up
this
noise
is
caused

by
the

piston
and
cylinder
To
locate
the

place
cause
a
misfire
on
each

cylinder

This
noise
is

heard
at
each

highest
and

lowest
dead

end
of
the

piston
To
locate

the

place
cause
a
misfire
on
each

cylinder

This

noise

may
be

caused

by
the
worn
or

damaged
bearings
or

by
the
uneven

surface

of

sliding
parts

An

improper
adjustment
of
the
valve
clear

ance

Noise

of
the

timing
chain

An

excessive
end

play
on
the
crankshaft

Remarks

Disengage
the
clutch

slightly
and

this

noise
will

stop

Wear
on
the
clutch

pilot
bushing

Remarks
This
noise
will
be
heard
when
the

clutch
is

disengaged

ET
31
Adjust
or

replace
ignition
syste
m

This
is

caused

by
the
wom
or

damaged

bearings
or

unevenly
worn
crankshaft

Renew
the

bearings
and

adjust
o

change
the

crankshaft

Check
the
lubrication

system

Same
as
the

case
of
crankshaft
bear

ings

This

may
cause
an
abnormal

wearing

of
the

cylinder
and
lower

compression

which
in

turn
will

cause
a

lower

output
power
and
excessive

consump

tion
of
oiL

Overhaul
the

engine

This

may
cause
a

wear
on
the

piston

pin
or

piston
pin
hole

Renew
the

piston
and

piston
pin
as

sembly

Replace
the

water

pump
with
a
new

one

Readjust

Adjust
the
tension

of
the
chain

Disassemble
the

engine
and
renew
the

main

bearing
bushing

Renew
the

bushing
and

adjust
the

drive
shaft