carb DATSUN 210 1979 Owner's Manual

Hot

air
Engine
Fuel

To
manifold
I
Air
inlet

pipe

2
Air

con
trol

valve

3
Hot
air

pipe

4

Diaphragm

5
V

Bellum
hose

6

Diaphragm
spring

7
Air

bleed
valve

closed

8

Temperature
sensor

assembly

Fig
EF
3

Hot
Air

Delivery
Mode
During
cold

engine
operation
EC007

COLD
AIR
OPERATION

1
When

the
vacuum
is
small
or

when
the

engine
is

operating
under

heavy
load
the

air
control
valve

opens

widely
irrespective
of
the

temperature

around
the
sensor
to
introduce
the

cold
air
for
increased

power
of
the

engine

2
When
the

engine
intake
air
tem

Cold
air

I
L
CD

mf

LlF

JII

1
perature
is

high

The
s
ns
r
air
bleed
valve

opens

fully
to
break
the
vacuum

passage

between
the
intake
manifold
and
the

vacuum

motor
Due
to
the
force
of
the

vacuum
motor

diaphragm
spring
tne

air
control
valve
closes
the
hot
air

pipe

of
the

air
cleaner
and
introduces
the

cold
air
See

Fig
EF
4

I

manifold
I
Air
nlet

pipe

2
Air
control
valve

3
Hot
air

pfpc

4

Diaphragm

5
Vacuum
hoses

6

Diaphragm
spring

7
Air
bleed
alve

fully
open

8

Temperature

assembly

EF715

Fig
EF
4
Cold
Air

Deliuery
Mode

During
hot

engine
operation

TEMPERATURE
SENSOR

The

temperature
sensor
is
attached

to

the
inside
of
the
air
cleaner
The

bi
metal
built
in
the

sensor
detects
the
engine
intake
air

temperature
and

opens
or

closes
the
vacuum

passage
in

the

sensor

I
Protector
cover

2

Screw

3

Adjusting
frame

4
Air

temperature
bi
metal

5
Rivet

6
Valve

seat
frame

7

Lower
frame

8
Air
bleed
valve

9
Gasket

EF206

Fig
EF

5
Temperature
Sensor

EF
3
VACUUM
MOTOR
AND

AIR
CONTROL
VALVE

The

vacuum
signal
from
the

tem

perature
sensor
acts

upon
the
vacuum

motor

diaphragm
The
valve

shaft
at

tached
to
the

diaphragm
is
then
moved

up
or
down

in

response
to
the
vacuum

on
the

diaphragm
This
movement
of

the
valve

shaft
actuates
the
air

control

valve
to
control
the

temperature
of
the

air
to
be
introduced
into
the

air

cleaner

@

@

@
I
Valve

spring

2

Diaphragm

3

Retainer

4
Valve
shaft

EF207

Fig
EF

6
Vacuum
Motor

REMOVAL
AND

INSTALLATION

AIR
CLEANER

I
Loosen
bolts

securing
air
cleaner

to
air
cleaner
bracket

2
Loosen
air
cleaner

lock
bolt
and

remove
air
cleaner
from
carburetor

Disconnect
the

following
hoses
when

dismounting
air
cleaner

I

Fresh
air
duct

2

Hot
air
duct

3
Vacuum
hose
Sensor
and

idle
com

pensator
to
intake

manifold

4
Hose
Air

pump
relief

valve
Non

California
models

except
Canada

5
Air

induction
hose
Canada
and

FU
models

6
Hose
A
B
valve
to

air
cleaner

7
Hose
Air
cleaner
to
throttle

opener

or
vacuum
switch

8
Blow

by
hose
Air

cleaner
to
rocker

cover

3
To
install

reverse
the
removal

procedure

TEMPERATURE
SENSOR

Removal

I

Using
pliers
flatten

clip
con

necting
vacuum

hose
to

sensor
vacuum

tube

1

Pipe

2
Catch

3
Fixed
with

adhesive

4
Hose

5
Tab

6

Clip

7
Gasket

EC019

Fig
EF
7

Removing
Seruor

2
Disconnect
hose
from

sensor

3
Take
off

clip
from
sensor
vacuum

tube
and
dismount
sensor

body
from

air
cleaner

Note

The

gasket
between

sensor
and

air

cleaner
is
bonded
to

the
air

cleaner

side
and

should
not

be

removed

Installation

Mount
sensor
on
the

specified

position

2

Insert

clip
into

vacuum
tube
of

sensor
After

installing
each
vacuum

hose

secure
hose
with
the

clip

Note
Be

sure
to
install
vacUl
11n

hose

correctly
Correct

position
is
R
H

side
to

Ntisan

mark
at
the

top

face
of
sensor
for
intake
manifold

L

H
side
for

Deuum
motor

VACUUM

MOTOR

1

Remove

screws

securing
vacuum

motor

to
air
cleaner

2

Disconnect

valve
shaft

attached

to

vacuum
motor

diaphragm
from
air

control
valve

and

remove

vacuum

motor

assembly
from
air

cleaner

3
To
install

reverse
the

removal

procedures
Engine
Fuel

Fig
EF

8
Removing
Vacuum
Motor

INSPECTION

AIR

CLEANER
FILTER

Viscous

paper

type
air

cleaner
filter

does

o
ot

rt

quire
any
cleaning
opera

tion

until
it

is

replaced
periodically

Brushing
or

blasting
operation
will

cause

clogging
and
result

in
enrich

ment

of
carburetor
mixture

and

should
never
be

conducted
For
reo

placement
interval
of
air

cleaner
filter

refer
to

Maintenance

Schedule

AUTOMATIC

TEMPERATURE

CONTROL
SYSTEM

Engine
failures

resulting
from
a

malfunctioning
A
T
C

system
are

manifest

during
cold
weather

opera

tion
Such
failures

include

Engine
stall
or
hesitation

Increase
in
fuel

consumption

Lack
of

power

If
these

phenomena
should

occur

check

A
T
e

system
as

described
in

the

following
before

carrying
out

inspection
of

carburetor

I
Check
that

vacuum
hoses
are

se

l

urely
connected
in
correct

position

2

Check
each
hose

for
cracks
or

distortion

3

Check
A
T

C

system
for

proper

function
as

follo
ys
Confirm
that

engine
is

cold
before

starting
test

With

engine
topped
disconnect

fresh
air

duct
if
so

equipped

Place
a
mirror
at
the
end

of
air

cleaner
inlet

pipe
as
shown
and

check

to
see
if
air
control
valve

is
in
correct

position

EF
4
Fig
EF
9

Inspecting
Valve
Po

man

Air
control
valve
is

in
correct

posi

tion
if
its
cold
air
inlet

is

open
and

hot

air
inlet
is

closed

4
Start

engine
and

keep
idling

Immediately
after

engine

starting

check
air
control

valve
for

correct

position
as
described
above
In

this

case
correct

position
of
air
control

valve
is

the

reverse
of

step
3

under

hood
air
inlet
is
closed

and
hot
air

inlet
is

open

S

Check
that
air
control
valve

grad

ually
opens
to

cold
air

inlet
side

as

engine
warms

up
When

environmental

temperature
around

temperature
sen

sor
is
low

spend
more
time

for

engine

warming
up
operation
to
facilitate

smooth

operation
of
air
control

valve

If
the
above

test
reveals

any
prob

lem
in
the

opera
ion
of
air
control

valve

carry
out
the

following
test

VACUUM
MOTOR

I
With

engine
stopped
confirm

that

cold
air
inlet
is

open
and

hot
air

inlet
is

c1
Sed

If
not

check
air
control
valve
link

age
for

proper
operation

2

DiscoJln
ct
ac
um

motor
inlet

vacuum
hose

and
connect

another

hose
to
the

inlet
to

apply
vacuum
to

vacuum
motor

Vacuum
can

be

appli
d

by
breathing
in

tile
hos
e
end

as

shown
Then

confirm
that

the
air

control
valve

moves

3
With
hot
air
inlet
in

open
posi

tion
as

described
in

step
2

above

pinch
vacuum
hose
with

fingers
and

cut
off
air
from

vacuum
hose
In

this

condition

check
that
air
control

valve

maintains
the

condition
described
in

step
2

for
more
than

30
seconds

and

that
hot

air
inlet

is

open
If

diaphragm

spring
actuates

the
air
control
valve

by

Engine
Fuel

S
Idle

compensator
is
ill

good
order

if
a

hissing
sound
is

heard
when
its

temperature
reaches

operating
tern

perature

If
not

replace
idle

compensator
ldlerompensator
l
b
l

r
I

No
1
60
to
700C

140
to
15

Of

No
2
70

to
800C

158
to
1760F

FUEL
FILTER

DESCRIPTION

t
t

I

J
i

l
The
fuel
filter
is
a

cartridge
type
It

useS
a

paper
element

1
Body

2

Paper
element

3
Cover
EFOOS

Fig
EF

14
Sectional
View
of
Cartridge

Type
FuelFilte

FUEL
PUMP

t

j
f

EC132

Fig
EF
15
Schematic
View

of
Fuel

Pump

EF
6
OPERATING
TEST

Note
When

disconnecting
fuel
hoses

me
a

container
to
receive
fuel

remaining
in
fuel
hoses

STATIC
PRESSURE
TEST

The
static

pressure
test
should
be

conducted

as
follows

I
Disconnect
fuel
hose

between
car

buretor
and
fuel

pump

2
Connect
a
rubber
hose
to
each

open
end
of
aT
connector
and
con

nect
this
connector
hose

assembly
be

tween
carburetor
and
fuel

pump

Note
Locate
this
T
eonnector

as

close
to
carburetor
as

possible

3

Connect
a
suitable

pressure
gauge

to

the

opening
of

T
connector
and

fasten
the
hose
between
carburetor

and
T

connector

secUrely
with
a

clip

4
Start
and
run
the

engine
at

various

speeds

5

The

pressure

gauge
indicates

static
fuel

pressure
in
the
line

The

gauge
reading
should
be
within
the

specified
value

Fuel

pump
pressure

0
21
to
0
27

kg
em2

3
0
to
3
8

pli
I

Note
If
the

fuel
in
the
carburetor

float
chamber
has

run
out
and

engine
has

stopped
remove

clip
and

pour
fuel
into

carburetor
Fasten

clip
securely
and

repeat
static

pres

sure
test

If

pressure
is
not
within
the

specifi

ed
limit
remove

pump
as
an

assembly

CAPACITY
TEST

The

capacity
test
is

conducted

only

when
static

pressure
is
within
the

specification
To

conduct
this

test

proceed
as
follows

1
Disconnect

pressure
gauge
from

T
connector
and
in
its
vacant

place

install

a
suitable

container

as
a
fuel

sump

2

Start

engine
and
run
at

1
000

pm

3

Pump
should
deliver
the

specified

amouni

of
fuel

If

little
or
no
fuel
flows
from

open

end
of

pipe
it
is

an
indication

that

fuel
line

is

clogged
or

pump
is

mal

functioning

Fuel

pump
capacity

450

cc
27
46

eu
inl
min

at
1
000

rpm

REMOVAL
AND

INSTALLATION

Note
When

disconnecting
fuel

lines

use
a

container
to
receive

fuel

remaining
in
fuel
hoses

I
Disconnect

inlet
and

outlet
fuel

hoses
from
fuel

pump

2
Remove

fuel

pump

3
To

install
reverse
the
order
of

removal
Engine
Fuel

DISASSEMBLY

@@

@@

@

@@

1

Remove
screws
and
detach

upper

and
lower
bodies

2

Remove
screws
and
take
off

cap

and

cap
gasket
from

upper
body

3

Remove
inlet

and
outlet

connee

tors

4
Remove
valve
retainer
screws
and

take

off
valve

retainer

S
To

remove
diaphragm

press

down
its
center

against
spring
force

With

diaphragm
pressed
down
ilt

it

until
end
of

pull
rod
touches
inner

wall
of

body
Then
release

diaphragm

to
unhook

push
rod

Note
Be

careful
not
to

damage
dia

phragm
or
oil

seal

INSPECTION

Check
all

components
for
cracks

EF
7
I

Packing

2
Valve
a5scm

bly

3
Retainer

4
Screw

5

Diaphragm
assembly

6

Diaphragm
spring

7
Retainer

8

Diaphragm
assembly

9

Complete
body
lower

10
Screw

11
Washer

spring

12
Fuel

pump
cap

13

Cap
gasket

14
Connector
inlet

15
Connector
outlet

16
Rocker

arm

spring

17
Nut

18

Washer

spring

19
Washer

pJain

20
Gasket

21

Spacer

22
Rocker

pin

23

Spacer

24
Rocker

arm

EC134

Fig
EF
16

Fuel

Pump

wear
or

any
abnormalities
and

replace

with
new

parts
if

necessary

ASSEMBLY

I
To
assemble

reverse
the
order
of

disassembly
Closely
observe
the

following
instructions

Use
new

gaskets

Lubricate
rocker
arm

rocker
arm

link

and
rocker
arm

pin
before

installation

2
After

assembly
test
the
function

as
follows

a

Position
fuel

pump
assembly
about

I

meter
3
3
ft

above
fuel

level
of

fuel
strainer
and

connect
a

pipe

from
strainer
to

fuel

pump

b

Operate
rocker
arm

by
hand
If
fuel

is

drawn

up
soon
after
rocker

arm
is

released
fuel

pump
is

functioning

properly

DESCRIPTION

The

carburetors
are

of
downdraft

two

barrel

type

designed
to
increase

ppwe
r
a
fu
l
eC

l
Il
Y
t

3
ell
a

to

reduce

exhaust

gas
emissions

These
carburetors

present
several

distinct
features
of

importance
to

car

owner

A

summary
of

features
is
as
fol

lows

1

Secondary
throttle
valve
is

oper

ated

by
throttle
lever

High
power
and

good
acceleration
are

gained
with
com

bination
of
the

auxiliary
valve

2

Accelerating

pump
provide
ex

cellent
acceleration

3
Power
valve
mechanism
is

a
vacuo

urn
actuated

boost

type
and

improves

high
speed
driving

4

The
throttle

opener
control

sys

tem

Except
FU
model

incorporates
a

servo

diaphragm
which

helps
open
the

throttle
valve
at

a

decreasing
speed
so

as
to

reduce

hydrocarbon
emissions

to

a
minimum

5
An
anti
d

eseling
solenoid

valve
is

installed
to

prevent
dieseling
When

ignition
key
is

turned
off
the

fuel

passage
involved
in
the
ow

system
is

closed
and
the
fuel

supply
is
shut

down

completely

The
solenoid
valve
also

serves
as
an

actuator
of
the
fuel

shut
off

system
on

the

FU
model

6
In
the
choke
mechanism
an

elec

trie
automatic

choke
is
used

to
auto

maticaDy
control
chok
valve

opera

tion

during
engin
war

up

7

The
carburetor
comes

equipped

with
dash

pot
which
ensures
smooth

deceleration
without

engine
stall
under

aU

operating
conditions

STRUCTURE
AND

OPERATION

These
carburetors
consist
of
a

main

system
for
normal

running
a
slow

system
for

idling
and

an

accelerating

and

power
mechanisIll

Some

emission
control
devices

are

added
E
ngine
Fuel

CARBURETOR

I

J

1

Primary
main

jet

2
Idle

adjust
screw

3
hUe
nozzle

4

By
pass
hole

5

Primary
throttle
valve

6

Primary
slow

jet

7

ptug

8

Primary
5l

w
air
bleed

9

Primary
main
air
bleed
10

Primary
air
vent

pipe

11

Primuy
main

nozzle

12

Choke
valve

13

Primary
small

venturi

14

Secondary
small

venturi

15

Secondary
air
vent

pipe

16

Secondary
main

nozzle

17

Secondary
main
air
bleed

18

Secondary
slow

air
bleed

1
Oloke
valve

2

Primary
air
vent

pipe

3
Prima
y
main
nozzle

4

Primary
slow

jet
19

Plug

20

Secondary
slow

jet

21

Needte

22
Fuel
fLlter

23

Secondary
tIuottle

valve

24

Auxiliary
valve

25

Secondary
main

jet

Note
Do
not
remo
the

parts
inarbd

with
anuteriak

EF416A

Fig
EF
17
Carburetor

PRIMARY

SYSTEM

PrlinarJ
main

sJstam

The
fUel

flowing
out
of
the

passages

at
bottom
of

float
chamber

passes

through
the

primary
main

jet
and
is

mixed
with
air

coming
from
main
air

bleed
The

gas
mixture
is

pulled
out

into
the

venturi

through
the
main

nozzle

When

throttle
valve
is
wide

open

and

engine
require
dense
mixture

gas

power
valve

opens
and
fuel
also
flows

into
main

system

EF044A

Fig
EF
18

PtJrlially

Loading

EF
8

I

Secondary
slow
air

bleed

2

Secondary
main
air
bleed

3

Secondary
main
nozzle

4

Primary
main
nozzle

5

Primary
main

air
bleed

6

Primary
slow
air
bleed

7

Primary
slow

jet

8

Primary
main

jet

9
Idle
nozzle

10
Primary
throttle
valve

II

Auxiliary
valve

12
Seco
dary
throttle
valve

13

Secondary
main

jet

14

Counterweight

IS

Secondary
slow

jet

EF419A

Fig
EF
24
At
Full

Open
High
Speed
Engine
Fuel

Secondary
slow

system

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

stepport

is
located

near
the

auxiliary
valve
in
its

fully
closed
state

ANTI

DIESELING
SYSTEM

The

carburetor
is

equipped
with
an

anti
liese1i

lg
solenoid

valye

As
the

ignition
switch
is

turned
off

the
valve
is

brought
into

operation

shutting
off
the

supply
of

fuel
to

the

slow
circuit

The

following
figure
shows
a
see

tional
view

of
this

control

An

ti
dies

eling
solenoid
valve

Ignition
switch
OFF

ON

t

L
li

FLOAT
SYSTEM

There
is

only
one
float
chamber

while
two
carburetor

systems

primary

and

secondary
are

provided

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

Because
of

the
inner
air

vent

type

float

chamber
ventilation
fuel
con

sumption
is

not
affected

by
dirt
ac

cumulated
in

the
air
cleaner
Ignition
switch

Q

1

T
Battery

niT

EC
3

Fig
EF
25

Anti
dieseling
Solenoid
Valve

The
needle
valve
includes

special

hard

steel
ball
and
wiD

not
wear
for
all

its

considerably

long
use

Besides
the
insertion
of

a

spring

will

prevent
the

flooding
at

rough
road

running

THROTTLE
OPENER

CONTROL
SYSTEM

T
O
C
S

Except
FU

model

The
function

of
the
throttle

opener

is
to

open
the

throttle
valve
of
the

carburetor

slightly
while
the
car
is
in

EF
10
deceleration

During
deceleration

the

manifold
vacuum
rises
and

the

quan

tity
of
mixture
in
the

engine
is

not

suffICient
for
normal

combustion
to

continue

4
consequently
a

great

amount
of

unburned
HC
is
emitted

Carburetors

equipped
with

the

throttle

opener
supply
the

engine
with

an

adequate
charge
of

combustible

mixture
to
maintain

proper
combus

tion

during
deceleration

resulting
in
a

dramatic
reduction
in
HC

emission

The

system
for
the

manual
trans

mission
model
consists
of

servo
dia

phragm
vlicuum

control
valve
throttle

opener
solenoid
valve

spee
l

detecting

switch
and

amplifier
On

the
auto

matic

transmission
model
an
inhibitor

and
inhibitor

relay
are
used
in

place
of

speed

detecting
switch
and

amplifier

on
the
manual
transmission

model
An

altitude

corrector
fitted
to
vacuum

control
valve

serves
to

automatically

regulate
the

operating
pressure
in

the

system
with

variation
of

atmospheric

pressure

T
o
C
S
n

operatIon

At
the

moment

when
the

manifold

vacuum
increases
as

occurs

upon
de

celeration

the
vacuum

control
valve

opens
to
transfer

the
manifold

vacuum

to
the
servo

diaphragm
chamber
and

the
throttle
valve
of
the

carburetor

opens

slightly

Under
this

condition
a

proper

amount

of
fresh
air

is
sucked

into
the

combustion
chamber
As
the
result

complete
combustion
of
fuel
is

as

sisted

by
this
additional
air

and
the

amount

of
H
C

contained
in

exhaust

gases
is

dramatically
reduced

Throttle

Clpener
sol
nold

valve

operation

Manual

transmission
models

The
throttle

opener
solenoid
valve

is
controlled

by
a

speed

detecting

switch
which
is

actuated

by
the

speed

ometer
needle

As
the

car

sp
ed
falls
below
16

km
h
10
MPH

this
switch
is
acti

vated

producing
a

signal

The

signal
is

led
to
the

amplifier
so

that
the

signal
can
be

amplified
to

a

degree

large
enough
to
actuate
the

Fuel
shut
oH

s
stein

operation

During
deceleration
when

the
en

gine

speed
is

above
a
certain
level
the

anti
dieseling
solenoid
valve
of
the

carburetor
closes
so
that
the
fuel
is

shut
off
When

engine
speed
falls

below

a
certain
level
the
anti

dieseling

solenoid
vaJv

oP
lS
so
that

the

f
el

flows
However

if
the

engine
speed
is

below
the

designated
level

even

during

deceleration
the
fuel

shut
off

system

does
not

operate
When
the
shift
lever

is
in
neutral

the
fuel

shut
off

system

does
not

operate

The

functions
of
each

part
of
this

system
are
as
follows

I

Engine
revolution
switch

The

engine
revolution

switch
turns

off
when

the

engine
revolution
is

above
2

100

rpm
and
turns

on
when

the

engine
revolution
falls
below
1

650

rpm
This
switch
is

actuated

hy
a

pulse

of

the

ignition
system

This
switch
is

located
on
the

right

hand

dash
side

panel
in
the

passenger

compartment
as
shown
in
the
follow

ing
figure
Engine
Fuel

I

Fig
EF
28
Location

of

Engine

Revolution
Switch

2

Neutral

detecting
switch

The
neutral

detecting
switch
turns

on
in

neutral
and
turns
off
in

other

shift

lever

positions

h

1

Neutral

detecting
switch

2

Revenelamp
switch

3

Top

detectim
switch
EC275
3
Throttle
valve

switch

The

throttle
valve

switch
is

installed

on

the
carburetor
It

turns
off
when

the

throttle
valve
is
closed

and
turns

on
when
the
throttle

valve
is

open

The

opening
position
of
the

throt

tle
valve

switch
is
calibrated
in

engine

rpm
when
the

engine
is
revved

up

under

no
load

The

switch
turns
on
when

the

engine
revolution
is

above
1

150

rpm

and

turns
off
when
the

engine
revolu

tion
is

below
1

000

rpm

1
Micro
switch

2

Connector

3

Adjusting
screw

EF848

Fig
EF
30
Location

of
Throttle

Valve
Switch

Fuel
shut
off
Anti

dieseling

Engine
revolution
Throttle
valve

opening
Shift
lever

position

system
solenoid
valve

Activated

Closed

Except
neutral
OFF

Closed
OFF

Neutral

ON

High
OFF

Except
neutral
OFF

Open
ON

Inactivated

Open
Neutral
ON

Closed
OFF
Excep
t
neutral
O
F

Low
ON
Neutral
ON

Except
neutral
OFF

Open
ON

Neutral
ON

Continuity
of
switch
Fig
EF
29
Locotion

of
Neutral

Detecting
Switch

EF
12

DASH
POT
SYSTEM

These

carburetors
are

equipped

with
a
dash

pot
interlocked
with
the

primary
thrott
Ie
valve

through
a

link

mechanism

The
dash

pot
prevents
the

throttle

valve

from

closing
abruptly
thereby

reducing
He
emissions

during
deceleia

tion
or

gear
shifting

In
automatic

transmissi9fi
models

it

also

prevents
engine
stall

resulting

from

quick
application
of
the
brake
or

from

quick
release
of
the

accelerator

pedal
after
it
s
been
tread

upon

slightly

INSPECTION

AND

ADJUSTMENT

CARBURETOR
IDLE
R
P
M

AND
MIXTURE
RATIO

CO
idle
adjustment
with

CO
meter

Refer
to
Carburetor
Idle

rpm
and

Mixture
Ratio
Section
ET
for
check

ing
and
a

justment

CO
idle

adjustment
without

CO
meter

Non
California
models

Refer
to

Carburetor
Idle

rpm
and

Mixture
Ratio
Section

ETl
fot
check

ing
and

adjustment

Idle

limiter

cap

Refer
to
Idle

Limiter

Cap

SeCtio

ET
for

checking
and

adjustment

FUEL

LEVEL

I

With

engine
idling

visually
check

fuel
level

through
sight
window
of

float
chamber

Fuel
level
is
correct

if
it

is
at
the

indicator

point

Note

Fuel
level
indicator

point
is

located
IS
mm
0
59
in
below

top

of
carburetor

body
H

as
shown
in

Figure
below
Engine
Fuel

EF088A

Fig
EF
33

Checking
Fuel
Level

To

adjust
fuel
level

proceed
as

follows

2

Remove
choke

chamber

3

Turn
down

choke
chamber

to

allow

float
to

come
into
contact
with

needle

valve
and

measure
H

shown

below

When
H

is

approximately
15
mm

0
59
in

top
float

position
is
correct

The

top
float

position
can
be
ad

justed
by
bending
float
seat

Upon

completion
of
the

adjust

ment

check
fuel

level
with

attached

level

gauge

nhH

J

1
Float

2
Float

stopper
3
Float

seat

4
Needle
valve

Fig
EF
34

Adjusting
Floot
Level

EF

14
4

Adjust
bottom
float

position
so

that
clearance

hl
between

float

seat

and
needle

valve
stem
is
1
3
to
I
7
mm

0
051
to
0
067
in
when

float
is

fully

raised
Bend
float

stopper
as

required

5

Install
choke
chamber

6
After

adjustments
in

steps
3
and

4
above
have
been

made
make

sure

that
when
fuel
is
delivered
to
the

float

chamber
the

fuel
level

is
maintained

within
the

specified
value

H

FAST

IDLE

I
Remove
carburetor

assembly

from

engine

2
Remove

bi
metal
cover

3

Place
fast
idle
arm
on
second

step

of
first
idle
cam
Then

adjust
fast
idle

adjusting
screw
as
shown
at
A
in

illustration

The
clearance
A

should
be

specified
value
in
the

following
table

4

To
check
fast
idle
cam

setting
by

engine
speed
proceed
as
follows

Warm

up
engine
sufficiently
Set

fast
idle

cam
at
2nd

step
and
read

engine

speed

Fast
idle
cam
is

properly
set
if

engine
speed
is
within

above

specifica

Hons

VACUUM
BREAK

I
Close
choke

valve
completely

2
Hold
choke
valve

by
stretching

rubber
band
between
choke
shaft
lever

and

stationary

part
of

carburetor

3
Push
vacuum
break

stem
with

plie
and

puD
fully
straight

4
Under

this
condition

adjust
gap

shown
at
8
in

illustration
between

choke

valve
and
carburetor

body

Clearance
Bu

All
model

except
FU
model

1
80
to
1
98
mm

0
0709
to

0
0780
in

FU

model

1

98
to
2
16
mm

0
0780
to
0
0850

in
Engine
Fuel

Clearance
A

mm
in
Engine
speed

rpm

Manual
transmission
0
73

to
0
87

0
0287
to

0
0343

1

00
to
1
14

0
0394
to

0
0449
2

400
to
3
200
1
900
to
2

700

Automatic

transmission

Fast

idle
earn

steps

g
g
2
5
t

to
J

A
ti

Ogc
j
jdle
adjusting
screw

o

0

II
r

Throttle

chamber

EF098A

Fiil
EF
35

Adjusting
Fast
Idle

@
B

@

cv

Push

I

4

Choke
valve

5

Vacuum
break
stem

EF885
1
Rubber
band

2

Vacuum
break

stem

3
Vacuum
break
rod

E
F099A

Fig
EF
36

Adjwtirig
Vacuum
Break

EF
15

CHOKEUNLOADER

I
Close
choke
valve

completely

2

Hold
choke

valve

by
stretching
a

rubber

band
between
choke
shaft
lever

and

stationary
part
of

carllUretor

3
Pull

throttle
lever
until
it

com

pletely
opens

4
Under
this
condition

adjust
clear

ance
e
See
illustration
between

choke
valve
and
carburetor

body
by

bending
unloader

tongue
See

Fig

EF
37

Clearance
C

All

modelS
ex

pt
F
U
model

2
36

mm
0
0929

in

FU
model

2
17

mm
0
0854
in

Note
Make

sure
that
throttle
valve

opensfuDy
when
carburetor
is

mounted

on
car

If
throttle
valve
fails
to

open
fully

unloader
becomes

inoperative
re

suiting
in

poor
acceleration
after

engine
is
started

AUTOMATIC

CHOKE

HEATE
IRCUIT

Checking
heater

circuit
with

function

connector

CAUTION

00

not
attach

test
leads
of
8
circuit

tester
to
those
other
than

designated

I

With

engine
not

running
check

for

continuity
between
A
and

B

If

continuity
exists
heater
is

fune

tioning
properly

If

continuity
does
not
exist

check

for
discon
nected

connector
or

open

P
T
C

heater
circuit

2

With

engine
running
at

idle
check

for

presence
of

voltage
across
A

and
B

If
voltmeter

reading
is
12
volts

heater
circuit
is

functioning
proper

ly

If
voltmeter

reading
is
zero

check

for
disconnected
connector

open

circuit
or

faulty
automatic

choke

relay

3

Replace
faulty

parts
Engine
Fuel

c

i

CD

1
Rubber
band

2
Unloa
er

tongue

3
Choke
vaJve

f
rC
EC150

Fig
EF

37

Adjusting
Choke
Unloader

SJ

v

1

Ignition
switch

2
Automatic
choke

relay

Engine
stop
ON

Engine
start
OFF
3
Automatic
choke
heater

4
Function
test
connector

5
L
terminal
of
alternator

EF

16
Fig
EF

38
EF433A

Checking
Automatic
Choke
Heater
Circuit

with
Function
Teat
Connector