1973 DATSUN B110 ignition

ABNORMAL

COMBUSTION

backfire
afterflfe

run
on
etc

Improper
ignition
timing

Fuel

system
in
trouble

Defective

cylinder
head

etc

EXCESSIVE
OIL

CONSUMPTION

Oil

leakage

Excessive
oil

consumption
ENGINE

Improper
ignition
timing

Improper
heat

range
of

the

spark
plugs

Damaged
carburetor
or
manifold

gasket

backfire
afterflre

Defective
carburetor

jet

Improper
function
of
the
float

Uneven

idling

Improperly
adjusted
valve
clearance

Excess
carbon
in
the
combustion
chamber

Damaged
valve

spring
backfire
afterure

Loose
oil
drain

plug

Loose

or

damaged
oil

pan
gasket

Loose
or

damaged
chain
cover

gasket

Defective
oil
seals
in
front
and

rear
of
the

crankshaft

Loose
or

damaged
locker

cover
gasket

Improper
tightening
of
oil
filter

Loose
or

damaged
oil

pressure
switch

Worn

cylinder
and

piston

Improper
location
of
the

ring
split
or
reo

versed

assembly

ET
32
Adjust
the

ignition
timing

Use

specified
spark
plugs

Replace
them
with
new
ones

Disassemble
the
carburetor
and

check

it

Adjust
the
level
and

check
the
needle

valve

Adjust

Readjust

Remove
the

cylinder
head
and

remove

carbon

Replace
it
with

a
new
one

Tighten
it

Renew
the

gasket
or

tighten
it

Renew
the

gasket
or

tighten
it

Renew
the
oil

seals

Renew
the

gasket
or

tighten
it

Do
not

tighten
excessively

Renew
the

gasket
and

tighten
it
cor

rectly

Retighten
or
renew

the
oil

pressure

switch

Overhaul
the

cylinder
and
renew
the

piston

Reassemble
the

piston
rings
correctly

FUEl
SYSTEM

Secondary
throttle
valve

is

operated
by
throttle
lever

The

high

power
and

good
acceleration
are

gained
with

combination
of

the

auxiliary
valve

2

Accelerating
pump
gives
excellent

acceleration

3

The

power
valve
mechanism
is
of
a

vacuum
actuated

boost

type
and

improves

high
speed
driving

4
The

throttle

opener
control

system
Refer
to
Section

ET

incorporates
a

servo

diaphragm
The
servo
dia

phragm
helps
open
the
throttle

valve
at
a

decreasing
speed

so
as

to
reduce

the
emission
of

hydrocarbons
to
a

minimum

5
An

anti
dieseling
solenoid

is
used
as
a

means
of

preventing
dieseling
When
the

ignition
key
is
turned
off
the
fuel

passage
involved
in
the
slow

system
is

closed

and
the
fuel

supply
is
shut

down

completely

6
In

the
choke

mechanism
an

electric
automatic

choke

is
used
to

automatically
control
the
choke
valve

operation

during
the
warm

up
of
the

engine

7
The
carburetor

for
automatic
transmission
is

equipped
with
so
called

dash

pot
that

is
it
makes
smooth

decelerating
without

engine
stall
at

any

operating
condi

tion

These

carburetors
are

quite
similar
in

appearance
as

explained
above

except
the

dash

pot
for
the
au
tomatic

transmission
model
The

differences
in

performance
are

explained
in
the

following
as

necessary

for
Manual
transmission

for
4utomatic
transmission

Fig
EF
14
External
view

of
carburetor

STRUCTURE
AND
OPERATION

These

carburetors
consist
of

the

primary
system
for

normal

running
and

secondary
system
for
full

load

running
The

float

system
which
is

commonly
used

by
the
primary
and

secondary
systems
the

secondary
switch
over

mechanism

accelerating
mechanism
etc
are

also
at

tached

The
anti

dieseling
solenoid
valve
and
the

power
valve

mechanism

are
used

The

carburetor
is
of
down
draft
two
barrel

type

EF
9

ENGINE

Step
system

The
construction
of
this

system
corresponds
to

the

idling
and
slow
system
of
the

primary
system

This

system
aims
at
the

power

filling
up
of
the

gap

when
fuel

supply
is

transferred
from
the

primary

system
to
the

secondary

system
The

step
port
is

located

near
the

auxiliary
valve
in
its

fully
closed

state

Anti

uesetmg

solenoid

Ignition
switch

OFF
ON

I

L
i1

7

I
Anti

dieseling
solenoid

valve

When
the

ignition
key
is
turn

to
OFF

current
will

not
flow

through
the

solenoid
and
the
slow

system
fuel

passage
is

closed
to
shut
down

the

engine
without

dieseling

If
anti

dieseling
solenoid
is
found

defective

replace
the

solenoid
as
an

assembled
llnit

Fuse

Ignition
switch

T
Baitery

717

Fig
EF
20
Schematic

drawing
of
anti

dieseling
solenoid

Removal
and

installation
of
anti
dieseling
solenoid

Removal

Solenoid
is

cemented
at

factory
Use

special
tool

STl9
I

50000
to

remove
a

solenoid

When

this
tool
is

not
effective
use
a

pair
of

pliers
to

loosen

body
out
of

position

Installation

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

carburetor

move
than
12
hours
without

operation

3
Mter

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

In

installing
valve
use
caution
not
to
hold

body
directly
Instead

use
special
tool

tight

ening
nuts

as

required

Float

system

Fuel
fed
from
the

fuel

pump
flows

through
the
filter

and
needle
valve
into
the
float
chamber
A
constant
fuel

level
is
maintained

by
the
float
and

needle
valve

As
ventilation
within
the
float

chamber
is
of
an

air
vent

method

Electric
automatic
choke

An
electric
heater

warms
a

bimetal
interconnected
to

the
choke
valve
and
controls
the

position
of
choke
valve

and
throttle
valve
in
accordance
with
the

elapse
of
time

or

the
warm

up
condition
of

engine

The
construction
and
function
of
each

part
of
this

automatic

choke
are

as
follows
See

Figure
EF
21

EF
12

FUEl

SYSTEM

l

I

@

1J
w

I

I

I

I

1

1
1
t

2

3

4

5

6

7

8

9

10

tt

12
Hi
metal

Heater

Bi
metal

cover

Fast
idle

earn

Bi

metal

Bi

metal

index
mark

Choke

shaft
lever

Choke
valve

Unloader

tang

Vacuum

diaphragm

Throttle
valve

Fast
idle

adjusting
screw
j

@

Fig
EP
21

Construction

of
electric

automatic
choke

Bi

metal
and
heater

Electric
current
flows

through
the
heater

as
the

engine

starts
and
warms
bi

metal
See

Figure
EF
22
The

deflection
of
bi
metal
is
transmitted
to
the

choke
valve

through
the
choke
valve
lever

Ignition
switch
Fuse

Alternator

T

o

o
Auto
choke
relay

Auto

choke
heater

Fig
EF
22
Schematic

drawing
of
electric

automatic
choke
heater

Fast

idle
C3m

The
fast
idle
cam
determines
the

opening
of
throttle

valve

so
as

to
obtain

proper
amount
of
mixture

corresponding
to
the

opening
of
the

choke
valve
which

depends

upon
the
warmed

up
condition
of
the

enigne
Fast
idle

adjusting
screw

This

screw

adjusts
the

opening
of

the
throttle
valve

by

fast
idle

cam

Unloader

When

accelerating
the

car

during
the
warm

up
period

that

is
before
the
choke
valve
does
not

sufficiently

open
this
unloader
makes
the

choke
valve

open
to
a

certain
extent

so
as
to
obtain
an

adequate
air

fuel

mixture

Vacuum

diaphragm

The

moment
when

engine
starts
this

diaphragm
forces

choke
valve

open
to
the

predetermined
extent
so
as

to

provide
necessary
amount
of
air

fuel
mixture

Bi

metaI
index
mark

The
bi

metal
index
mark

is
used
for

setting
the

moment
of
the

bi
metal
which
controls
the

mixing

ratio

required
for

starting
the

engine

EF
13

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

Troubles

Improper
idling

Rough
engine
idle
or

engine

stop

Engine
idle
too
fast

Engine
hesitation
FUEl
SYSTEM

Possible
causes

ruel
strainer

clogged

Vacuum

jet
clogged

Power
valve

operated

improperly

Slow

jet
clogged

Each
throttle
valve
does

not
close

Secondary
throttle

valve

operated
im

properly

Each
throttle
valve
shaft
wear

Packing
between
manifold
and
carburetor

defective

Fuel
overflows

Incorrect
carburetor

adjustment
idle

speed

idle
mixture
choke

setting

Incorrect
basic

ignition
timing

Incorrect
automatic

temperature
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

Each
main

jet
slow

jet
clogged

By
pass
hole
idle

passage
clogged

Emulsion
tube

clogged

EF
23
Remedies

Clean

Clean

Adjust

Clean

Adjust

Overhaul
and

clean

Replace

Replace
tightening

See
the
first
item

Adjust
idle

speed
mixture
and

timing

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
auotmatic

choke

Adjust
or

replace
ignition
system

Clean

Clean
tube

Clean

Troubles

Car
knock
when

coasting

Engine
does
not

start
ENGINE

Possible

causes

Idling
adjustment
incorrect

Secondary
throttle

valve

operated
im

properly

Incorrect

throttle

opener
adjustment

Trouble
in
PCV
valve

Defect

or
malfunction
of

ignition
system

spark

plug
high
tension
cable

breaker

point
ignition
coil
etc

Fuel
overflows

No
fu
el

Idling
adjustment
incorrect

Fast
idle

adjustment
incorrect

Damaged
anti
dieseling
solenoid

Bi
metal
rod
in

contact
with
hi
metal

case

EF
24
Remedies

Correct

adjustment

Overhaul
and

clean

Adjust
throttle

opener

Replace
PCV
valve

Adjust
or

replace

ignition
system

See
the
first
item

Check

pump
fuel

pipe
and

needle
valve

Correct

adjustment

Correct

adjustment

Replace

Adjust

DATSUN

1200

MODEL
B
11

0
SERIES

L
NISSAN

I

NISSAN
MOTOR
CO

LTD

TOKYO
JAPAN
SECTION

EE

ENGINE

ELECTRICAL

SYSTEM

BATTERY

STARTING
MOTOR

CHARGING

CIRCUIT

ALTERNATOR

REGULATOR

IGNITIO
N

CIRCUIT

DISTRIBUTOR

IGNITION
COIL

SPARK
PLUG
EEl

EE
3

EE

15

EE

16

EE

23

EE

29

EE
29

EE

36

EE

37