1979 DATSUN 210 fuel

If
not

adjust
throttle
valve
switch

Fig
EF

59

Adjusting
Throttle

Valve
Switch
Eng
ine
Fuel

If
throttle
valve
switch
cannot
be

adjusted
to

specification
replace

Engine
operation
Throttle
valve
switch

continuity
Engine
speed

rpm

When

engine
speed

increases
OFF
ON
1
150

t200

When

engine
speed

decreases
ON

OFF
I
000
t
200

Inspecting
engine
revolution

switch

Note
Before

checking
the

engine

revolution
switch

make
sure

the

functions
of
other

components
are

correct
in
accordance

with
the

items

described
above

Disconnect
throttle
valve

switch

connector
2
Connect
circuit
tester

3
Run

engine
at

idling
speed

4

Depress
clutch

pedal
and
shift

gear
into
5th

position

5

Depressing
clutch

pedal
increase

engine
speed
slowly
Make

sure

engine

speed
is
within
the

specified
range

when
voltmeter

goes
from
OV
to
l2V

Then
decrease

engine

speed
slowly

and
make

sure

engine
speed
is
within

the

specified
range
when
voltmeter

goes
from
12V

to
OV

EF
23
MAJOR
SERVICE

OPERATION

The

perfectly
adjusted
carburetor

deliver
the

proper
fuel
and
air
ratios

at
aD

speeds
for
the

particular
engine

for
which
it

was

designed
By
com

pletely
disassembling
at
re
ular
inter

vals
which
will
allow

cleaning
of
all

parts
and

passages
the
carburetor
can

be
maintained
in
its

original
condition

and
will

continue
to
deliver
the

proper

ratios

To
maintain
accurate
carburetion

of

passages
and

discharge
holes
ex

treme
care
must
be
taken
in

cleaning

Use

only
carburetor
solvent
and

compressed
air

to
clean
all

passages

and

discharge
holes
Never

use
wire

or

other

pointed
instrument
to
clean
or

carburetor
calibration
will
be
affected

REMOVAL

Remove
carburetor
from

engine

taking
sufficient

care
to
the

following

Precautions

a
When

disconnecting
fuel
lines
do

not

spill
fuel
from
fuel

pipe

b
When

removing
carburetor

do
not

drop

any
nut

or
bolt
into

intake

manifold

c
Be

careful
not
to
bend
or
scr
tch

any

part

d
Link

system
of
carburetor
differ

between
models
for
U
S
A

and

Canada
For
details
see

Figure
EF

60
which
is
based
on
Canadian

models

En9ineFuel

DISASSEMBLY
AND
ASSEMBLY

Except
FU

model

A

JS

@fB

@
Choke

chamber

@
Center

body

@
Throttle

chamber

1

Servo

diaphragm
of
throttle

opener

2
Dash

pot

3

Automatic
choke

cover

4

Automatic
choke

I
ody
and

diaphragm
chamber

S

Accelerating

pump
lever

6

Auxiliary
valve

7

Venturi

stopper
screw

8

Primary
and

secondary
maU

venturi

9

Secondary
slow

jet
I

I
l

c
I
liO

JCJ

@

c

1
@

11
i

I

rJ

@

10

Power

valve

11

Secondary
main
air

bleed

12

Primary
main
air
bleed

13

Injector

weight

14

Primary
slow
air
bleed

15

Accelerating
pump

16

Plug

17

Primary
slow

jet

18

Needle
valve

19

Float

20
Anti
c1ieseling

solenoid
valve

21

Primary
main

jet

22

Secondary
main

jet
23
Idle

limiter

cap

24
Idle

adjust
screw

25

Spring

26
Throttle

adjust
screw

27

Spring

28

Primary
and

secondary
throttle

valves

29
Fast
idle

adjust
screw

30

Accelerating
pump
rod

31
Throttle
retum

spring

32
Stroke
limiter

Note
Do
nOt
remove
the

puts

marked
with
an
uterisk

EF420A

Fig
EF
60
c
rburetor

EF
24

FU
model
Engine
Fuel

If

@
Choke
chamber

@
Ceo
ter

body

@
Throttle
chamber

1
Dash

pot

2
An
tomatic
choke

cover

3
Automatic
choke

body
and

diaphragm

chamber

4

Throttle
valve
switch

assembly

5
Throttle

valve
switch

adjust
screw

6
Fast
idle

adjust
screw

7

Secondary
slow

jet
EF567A

8

Secondary
small
venturi

9

Primary
small
venturi

10
Power
valve

11

Secondary
main
air

bleed

12

Plug

13

Primary
main
air
bleed

14

Plug

15

Injector
weight

16

Primary
slow
air
bleed

17

Accelerating
pump

18
Needle
valve

19

Plug
20

Primary
slow

jet

21
Float

22
Anti
dieseling
solenoid

valve

23

Secondary
main

jet

24

Primary
main

jet

25
Idle
limiter

cap

26
Idle

adjust
screw

27
Throttle

adjust
screw

28
Vaeuum
screw

29

Primary
and

secondary
throttle

valves

Note
Do

not
remove
the

parts
muked

with
an

utemk

Fig
EF
61
Carburetor

EF
25

Engine
Fuel

Dhassembly

1

Properly
fitting
wrenches

and

screwdrivers
must
be

used
on
the

nozzles
and

jets
as

well
as
on
the
screws
arid
nuts
and
cafe
must
be

exercised
not
to

damage
any
parts

2

Clean
the
carburetor
thoroughly

before
disa
lSembly

Choke
chamber

parts

Except
FU
model

@

FU
model
3
Do
not

attempt
to
remove

any

parts
marked
with
an
asterisk

Servo

diaphragm
of

throttle

opener

2

Automatic
choke

cover

3
Dash

pot

4

S

pring
hanger

S
Automatic

chl
ke
body
and

diaphragm
chamber

6
Choke
valve

7

Pump
lever

retufn

sprina

8

Accelerating
pump
lever

9

Accelerating
pump
lever

shaft

10

Accelerating
pump
dust
cover

11

Accelerating
pump

12

Primary
slow
air

bleed

13
Needle
valve

14
Float

IS
Stroke
limiter

Notc
Do
Dot
remove

the

parts

marked
with
an

asterisk

EF085A

CHOKE

CHAMBER
PARTS

1

Dash

pot

2

Automatic
choke
cover

3
Automatic
choke

body
and

diaphragm
chamber

4

Throttle
valve
switch

assembly

S

Primary
slow

air
bleed

6
Needle
valve

7

Float

EF

26
EF086A

Fig
EF

62
Chohe

Chamber

Engine
Fuel

Choke
chamber

parts

FU

model

Except

FU
model
R

5

7

@

l
i

1

I
ft

Y

mJ

r

ft
1
@

@

1

EF421A

Tl@@

EF568A

EF
27
1

Secondary
slow

jet

2

Plug

3
Power
valve

bleed
d
mam
au
4

Seeon

ary

bleed
P

imary
maID
aIr

5
r

ight
6

Injector
we

7

Plug

t
8

Primary
slow

Je

d

valve
9
Anti
dieseling
solenOl

t
O
P

imary
malO

Je
1
r

main

Jet
11

Secondary

iliary
valve
12
Aux

screw
13
Venturi

stopper

duv

small
nd

seeon
J
14
Prima
a

ventuns

tl
not
J

eIIlove

the
p
Note
Do

tIt
an

asterISk
markedwt

CENTER

BODY
PARTS

slow

jet
1

Secondary

aU
yen
turi
2

Secondary
sm

Yen
turi
3

Primary
small

4
Power
valve

n

air
bleed
5

Secondary
m3J

6

Plug

on

air
bleed
7

Primary
mm

8

Plug

9

nJ
eetor

weight

pump
10

Accelerating

11

Plug

et
12

Primary
l
w

J

lenoid
valve
13
An
ti
dieseling
50

mamJet
14

Secondary

t
IS

Primary
mamJc

ill

y
valve
16
Aux
ar

the

parts
Do
not

remOVe

t
Note

th
an
utens
marked
WI

EF

63
Center

Body
FIg

Engine
Fuel

Throttle
chamber

parts

Except
FU
model

1
1

4
@

EF087A

1

Throttle
return

spring

2

lluottlc

opencr
adjusuctew

3

Accelerating
pump
rod

4

Fa
t
idle

adjust
5CICW

5

Primary
and

secondary

throttle
valve
6
Sprin8

1
Idle

adjust
screw

8
Idle
limiter
cap

9

Spring

10
Throttle
adjust
rew

oG

I
l

I
r

Y
Note
Do
not
remove
the

puts

ked
with
an
uterisk
FU
model

on

TIlROTfLE
CHAMBER
PARTS

1
Throttle
valve
switch
adjust
screw

2
Fast
idle

adjust
screw

3
limiter

cap

4
Idle

adjust
screw

S
Throttle

adjust
screw

6
Vacuum
screw

7
Primary
and

secondary

throttle

valves

Note
Do
not
remove

the
putl

marked
with
an

uterist
EF864

Fig
EF
64
Throttle
Chamber

EF

28

CLEANING
AND
INSPECTION

Dirt

gum
water
or
carbon
con

tamination
in
or
on
exterior

moving

parts
of
a
carburetor
are
often

respon

sible
for

unsatisfactory
performance

For
this

reason
efficient
carhuretion

depends
upon
careful
cleaning
and

inspection
while

servicing

Blow
all

passages
and

castings

with

compressed
air
and
blow
off
all

parts
until

dry

Note
Do
not

pass
drills
or
wires

through
calibrated

jets
or

passages

as
this

may

enlarge
orifice
and

seriously
affect
carburetor
calibra

tion

2
Check
all

parts
for
wear
If
wear

is
noted

damaged
parts
must
be
re

placed
Note

especially
the

following

I
Check
float
needle
and
seat
for

wear
If
wear
is

noted
assembly
must

be

replaced

2
Check
throttle
and
choke
shaft

bores
in
throttle
chamber
and
choke

chamber
for
wear
or
out
of
roundness

3

Inspect
idle

adjusting
needle
for

hurrs
or

ridges
Such
a
condition
re

quires
replacement
Engine
Fuel

3

Inspect
gaskets
to
see
if

they

appear
hard
or

brittle
or
if

edges
are

torn
or

distorted
If

any
such

condi

tion
is
noted

they
must
be

replaced

4

Check

filter
screen

for
dirt
or
lint

Clean

and
if
screen
is

distorted
or

remains

plugged
replace

5

Check

linkage
for

operating

condition

6

Inspect
operation
of

accelerating

pump
Pour
fuel
into
float
chamber

and
make
throttle
lever

operate
Check

condition
of
fuel

injection
from
the

accelerating
nome

7
Push

connecting
rod
of
dia

phragm
chamber
and

block

passage
of

vacuum
with
finger
When

connecting

rod
becomes
free
check
for
leakage
of

air
or

damage
to
diaphragm

Jets

Carburetor
performance
depend

on

jets
and
air
bleeds
That
is

why

these

components
must
be
fabricated

with
utmost
care
To

clean
them
use

cleaning
solvent
and

blow
air

on
them

Larger
inner
nwnbers

stamped
on
the

EF

29
jets
indicate

larger
diameters
Ac

cordingIy
main
and
slow

jets
with

larger
numbers

provide
richer
mixture

the
smaller
numbers
the
leaner
mix

ture

Conversely
the
main

and
slow
air

bleeds

through
which
air

to

passes

make
the
fuel

leaner
if

they
bear

larger

numbers
the
smaller

numbers
the

richer
fuel

Assembly

To
assemble
reverse

the
disassem

bly

procedure
taking
care
to
the

following

I
Thoroughly
wash
all
the

parts

before

assembling

2

Inspect
gaskets
to

see
if

they

appear
hard
or
brittle
or
if

edges
are

torn
or
distorted

If

any
of
such
undesirable
condi

tions
is

noted

they
must
be

replaced

3
Install

jet
and
air

bleed

having
the

Same
size

number
as
that
of

original

one

4

After
reassembling
carburetor

check
each

rotating
portion
or

sliding

portion
for
smooth

operation

Engine

fuel

TROUBLE

DIAGNOSES
AND

CORRECTIONS

In
the

following
table
the

symp

toms
and
causes
of
carburetor
troubles
and
remedies
for
them
are
listed
to

facilitate

quick
repairs

There
are
various

causes
of

engine

malfunctions

It
sometimes

happens

that
a

carburetor
which
has
no
fault

appears
to
have

some

problems
when

Condition
Probable

cause

Overflow

Dirt
accumulated
on
needle
valve

Fuel

pump
pressure
too

high

Needle
valve

improperly
seated

Excessive
fuel

consumption
Fuel
overflow

Slow

jet
too

large
on
each
main

jet

Main
air

bleed

clogged

Choke
valve
does

not

open
fully

Outlet

valve
seat
of

accelerator

pump

improper

Unked

opening
of

secondary
throttle
valve

opens
ioo

early

Power

shortage
Mainjels
clogged

Every
throttle
valve
Joes

not

open

fully

Idling
adjustment
incorrect

Fuel
filter

clo
ll
ed

Vacuum

jet
clogged

Air
cleaner

clogged

Diaphragm
damaged

Power
valve

operating
improperly

Improper
idling
Slow

jet

clogged

Every
throttle
valve

does
not
close

Secondary
throttle
valve

operating
im

properly

Throttle
valve
shafts
wom

Packing
between

manifold
carburetor

faulty

Manifold
carburetor

tightening

improper

Fuel
overflow

T

O
C
S

adjustment
incorrect

Vacuum
control
solenoid

damaged

Stuck
dash

pot

EF
30
acfuaJIy
theelectric

syslem
i
at
fatilt

Therefore

whenever
the

engine
is
mal

functioning
the

electrical

system

should
be
checked

fust
before

adjust

ing
carburetor

Corrective

action

Clean
needle
valve

Repair
pump

Replace

See
above

item

Replace

Clean

Adjust

Lap

Adjust

Clean

Adjust

Repair

Repair

Clean

Clean

Replace

Adjust

Clean

Adjust

Overhaul

and
clean

Replace

Replace

packing

Correct

tightening

See
the
first

item

Adjust

Replace

Replace