DATSUN 210 1979 Service Manual

Emission
Control

System

GENERAL

DESCRIPTION

There
are
three

types
of

control

system
These
are

I
Closed

type
crankcase
emission

control

system
2

Exhaust
emISSIon
control

system

3

Evaporative
emission
control

system

Periodic

inspection
and

required
sefVIcmg
of
these

systems
should
be

carried
out

to
reduce
harmful
emis

sions

to
a
minimum

CALIFORNIA

MODEL

1
Distributor

2
Thrott1

opener
vacuum

cont
rol
valve

3
From
3

way
connector
to
air
cleaner

4
Throttle

opener
servo

diaphnigm

5

Vacuum

switching
valve

6

Thermal
vacuum

valve

7

Vacuwn
motor

8
From

vacuum
motor
to

temperature
sensor

9
Carburetor

10
From
idle

compensator
to
intake

manifold

H
To
A
R
valve

Check
vane

B

B
P
T
vallie

C

P

c
V

nIter

o

Auto

choke
heater

E

A
B
valve

f

E
G
R
control

valve
A

E
D

j

L

I
E
G
R

pa
8e

H
C
A
C

valve

I
Carbon
canister

J
Air

pump

Throttle

opener
control

valve

EC377A

Fig
EC
l
Emi
sion
Control

System
California
model

EC
2

Emission
Control

System

NON
CALIFORNIA
MODEL

Except
Canada

5

CD
O@

j

l

t
AfT

M

T

1
Distributor

2

Vaellum

delay
valve

3

Throttle

opener
vacuum
control
valve

4

From
3

way
connector
to
air
cleaner

5
Throttle

opener
servo

diaphragm

6
Thermal
vacuum
valve

3

port
type

7
Vacuum

switching
valve

eMIT

8
Vacuum
motor

9
From
vacuum
motor
to

temperature
sensor

10
Carburetor

11
From

idle

compensator
to
intake
manifold

12
To
A
B

valve
rom

I

It
Intake
manifold

Check
valve

B

P
T
valve

C
Air

pump
air
relief
valve

D
P

C
V
mter

I

Auto
choke
heater

A
B

valve
I
E
G
R
control
valve

E
G
R

passage

Carbon
canister

Air

pump

Throttle

opener
control
valve

@

@
to

EC136A

Fig
EC
2
Emission
Control

System
Non

Californin
model

except
Canada

EC
3

Emission
Control

System

FU

MODEL
S

speed
Hatchback

1

Carbon
canister

2
Vacuum
motor

3
Back

pressure
transducer
valve

B

P
T
valve

4
Thermal
vacuum
valve

S

I
istributor

6
To
air
cleaner

1

Vacuum

switching
valve

8
Anti
backfire
valve
A
B
valve

9
To
A

B
valve

10
From
idle

compensator
to
intake

manifold

11
Carburetor

12
E
G
R
control

valve

13
From
vacuum

motol
to
temperature

sensoI
ET502

EC308A

Fig
EC
3
Emission
Control

System
FU
model

EC
4

Emission
Control

System

CANADA
MODEL

1
Distributor

2
Vacuum

delay
valve
AfT

3
Thermal
vacuum
valve
E
G
R

4
Throttle
opener
vacuum
control
valve

S

To
air
cleaner

6
Throttle

opener
servo

diaphragm

7
Carbon
canister

8
Vacuum
motor

9
From
vacuum
motor
to
temperature

sensor

10
E
G
R
control
valve

11

Carburetor

12
From
idle

compensator
to
intake

manifold

13
To
A
B
valve

14
Anti
backltre
valve

A
B
valve

15
Vacuum

switching
valve
M
T

@

CD

ft

o@o

0

LA
T

CID

om
fuel

tank
Intake

manifold

Intake

manifold

@
It
Il
9

EC138A

Fig
EC
4
Emission

Control

System
Canada
model

EC
5

Emission
Control

System

CRANKCASE
EMISSION
CONTROL
SYSTEM

DESCRIPTION

This

system
returns
blow
by

gas
to

both
the

intake
manifold
and
carbure

tor
aitdeaner

The

positive
crankcase
ventilation

P

C
v
valve
is

provided
to

conduct

crankcase
blow

by
gas
to
the
intake

manifold

During
partial
throttle

operation
of

the

engine
the
intake
manifold
sucks

the
blow

by
gas
through
the
P

C
V

valve

Normally
the

capacity
of
the

valve

is

sufficient
to
handle

any
blow

by
and

a

small
amount
of

ventilating
air

L

J

J

o

I

Fresh

air

Blow

by
gas
The

ventilating
air
is

then
drawn

from

the
dust
side
of
the
carburetor

air

cleaner

through
the
tube
connect

ing
carburetor
air

cle
er
to
rocker

cover
into
the
crankcase

Under
full
throttle
condition
the

manifold
vacuum
is

insufficient
to

draw
the

blow
by
flow

through
the

valve
and
its

flow

goes

through
the

tube
connection
in
the

reverse
direc

tion

On
cars
with
an

excessively
high

blow
by
some
of
the
flow
will

go

through
the
tube
connection

to
car

buretor
air

cleaner
under
all
condi

tions

r

IiI
e
1

LJ

1

Seal

type
oil
level

gauge

2
DafOe

plate

3

Flame
arrester

4
Filter

5

P
C
V
valve

6
Steel
net

1
Baffle

plate

EC871

Fig
EC
5
Crankcase
Emis
ion
Control

Sy
tem

EC
6
INSPECTION

p
C
V
VALVE
AND
FILTER

With

ei
gine

runnirig
at
idle
remove

the
ventilator
hose
from
P

C
V

valve

if
the
valve
is

working
a
hissing
noise

wiD
be
heard

as
air

passes
through
the

valve
and
a

strong
vacuum
should
be

felt

irnniediately
when
a

fmger
is

placed
over
valve
inlet

EC139A

Fig
EC
6

Checking
PC

V
Vo
ve

VENTILATION

HOSE

I
Check
hoses

and
hose
connec

tions
for
ieaks

2
oisconn
ct
all
hoses
and

clean

with

compressed
air

If

any
hose

cannot
be

free
of

obstructions

replace

Ensure
that
flame

arrester
is

surly

inserted
in

hose
between

air
cleaner

and
rocker
rover

ET277

Fig
EC

7

Checking
Ventilation
Hose

Emission
Control

System

EXHAUST
EMISSION
CONTROL
SYSTEM

DESCRIPTION

The
exhaust
emission
control

system
is
made

up
of

the

following

components

Early
fuel

evaporative
system
E

F
E

Air

injection
system

Air

induction

system

E

G
R

system

Spark

tirningcontrol
system

M
T

model

Spark
timing
control

system

A
T

model

Catalyst
Non
California

California

models
models

except
CanadaY
FU
model

Manifold

stove

Heat
valve

Air

pump

C
A
C
valve

A
B
valve

Check
valve
Air

pump

Air

relief
valve

A
B

valve

Check
valve

E
G
R

control
valve

Thermal
vacuum
valve
3

port
type

B

P
T
valve

Vacuum

switching
valve

Top
switch

Thermal

vacuum
valve
3

port

type

Vacuum

delay
valve

Non
California

models

only

Vacuum

switching

valve

Top
switch

Thermal
vacuum

valve
3

port

type
Vacuum
delay

valve

Thermal
vacuum

valve
3

port
type

Catalytic

converter

EC
7
Canada
models

Air
induction
valve

A
B
valve

E

G
R
control

valve

Thermal
vacuum

valve
2

port

type

B
P

T
valve
E

G
R
control

valve

Thermal
vacuum

valve
2

port

type

Vacuum

switching
valve

Top
switch

Catalytic

converter
Vacuum

delay

valve

Emission
Control

System

EARLY
FUEL
EVAPORATIVE
E
FE

SYSTEM

DESCRIPTION

@
jl
D

W

o

0
0
UL
@

1

Intake
manifold

9
Screw

2

Stove

gasket
10

Thermostat

spring

3
Mar
fold
stove
11

Heat
control
valve

4
Heat
shield

plate
12
Control

valve
shaft

5

Snap
ring
13
Exhaust

manifold

6

Countczwcight
14

Cap

7

Key
15

Bushing

8

Stopper
pin
16

Coil
spring

The

early
fuel

evaporative
system
is

provided
with
a
chamber
above
a

manifold
stove
mounted
between
the

intake
and
exhaust

manifolds

During

engine
warming
up
air

fuel
mixture
in

the
carburetor
is

heated
in

the
cham

ber

by
exhaust

gas
This
reuslts
in

improved
evaporation
of
atomized
fuel

droplets
in

the
mixture

and
in

smaller

content
of

hydrocarbons

HC
in
the

exhaust

gas

especially
in
cold
weather

operation

OPERATION

The

counterweight
rotates
counter

clockwise
and

stops
at

the

stopper
pin

mounted
on

the
exhaust
manifold

while
the

engine

temperature
is
low

With
this
condition

the
heat
control

valve
is
in

the

fully
closed

position

obstructing
the
flow

of
exhaust

gas
As

engine

temperature
goes

up
and
the

ambient

temperature
becomes

high

enough
to
actuate

the
thermostat

spring
the

counterweight

begins
to
j

@

l

7

1
1

5

If

@

I

Exhaust
gas
flows

valve
dosed

valve

opened

EC247

Fig
EC

8
Early
Fuel

Eaaporatiae
E
F
E

System

rotate
clockwise
and

again
comes
into

contact

with
the

stopper
pin
With
this

condition
the

heat
control
valve
is
in
the

full

open
position
and
exhaust

gas

passes
through
the

exhaust
manifold

without

heating
the
manifold
stove

REMOVAL
AND
INSTALLATION

1

Snap
ring

2
Lock
bolt

3

Key

4

Counterweight

5
Thermosta
t

spring

6
Coil

spring

7

Heat
controlvalve

EC913
8
Valve
shaft

Fig
EC

9
KF
E

Sy
tem
Component

EC

8

Remove

snap
ring
CD
and
lock
bolt

@
and
the

following

parts
can
be

detached
from
heat

control
valve

shaft

Key

ID

Counterweight

@

Thermostat

spring

@

Coil

spring

@

Note
As

previously
descnbed

heat

control

valve

j
is

welded

to
valve

shaft

@
at

exhaust
manifold

and

cannot
be
disassembled

To
install

reverse
the
removal

procedure

INSPECTION

1
With

engine
stopped
visually

check
the

quick
heat
manifold

system

for
the

following
items

I
Check
heat
control
valve
for

malfunction
due

to
break
of

key
that

locates

counterweight
to
valve
shaft

2
Rotate
heat
control
valve
shaft

with

fingers
and
check
for

binding

between
shaft
and

bushing
in

closing

and

opening
operation
of

heat
control

valve
If

any
binding
is
felt
in

rotating

operation
move
valve
shaft
in
the

rotation

direction
several
times
If
this

operation
does
not
correct

binding

condition
it
is

due
to
seizure
between

shaft
and

bushing
and
exhaust
mani

fold
should

be

replaced
as
an

assem

bly
Emission
Control

System

Counterweight

Heat
control
valve

Stopper
pin

EC249

Fig
EC
IO

Checking
Heat
Control

Valve
Movement

2
Run

engine
and

visually
check

counterweight
to
see
if
it

operates

properly

I
When

engine
speed
is
increased

discharge

pressure
of

exhaust

gases

causes

counterweight
to

move

down

ward

clockwise

2
For

some
time

after

starting

engine
in

cold
weather

counterweight

turns
counterclockwise
until
it

comes

into

contact
with

stopper
pin
installed

to

exhaust
manifold

EC
9
Counterweight
gradually
moves

down

clockwise
as

engine
warms

up

and
ambient

temperature
goes
higher

around
exhaust
manifold

If
it
does
not
move
at
all
check

and

replace
thermostat

spring

AIR

INJECTION

SYSTEM
A

I
S

DESCRIPTION

The
Air

Injection
System
A
I
S

is

adopted
on
U
S
A

models

except
FU

models

and

injects
compressed
air

secondary
air

coming
from
the
air

pump
into

the
exhaust

port
of
the

cylinder
head
to
reduce

hydrocarbons

He
and

carbon

monoxide
CO
in

exhaust

gas
through
recombustion

There

are
two

types
of
Air

Injection

System

Fresh
outside
air
is
drawn

by
the
air

pump
through
the

air

pump
air

cleaner

Compressed
air
is

injected
into

the

exhaust

manifold

through
the

check
valve

The
A
B

valve

supplies
air
from
the

carburetor
air
cleaner
to
the

intake

manifold

so
as

to

prevent
after

fire

during
deceleration

The
amount

of

injected
air
is
con

trolled

by
C
A

C
valve

California

models
or
air

relief
valve

Non

California
models

California
modelS

D

I

n

rn
lrr

I

00

1

Air
pump

2
Air

pump
air

cleaner

3
Air
relief
valve

4

Air
deaner

Non
Califomiamodels

I

I
mission
Control

System

hi

T1rID

j

I

S

Check
valve

6
Exhaust
manifold

7
Carburetor

8
Anti
backfire

valve

EC141A

Fig
EC
ll
A
l
S

for
CalifomitJ
Mod
1s

9

f

I
I

Ira

Pt
p

i

I

Air

pump

2
Air

pump
air
deaner

3
C
A

C
valve

4
Air

cleaner
SCheck
vav1e

6
Carburetor

7
Exhaust
manirold

8
Anti
backfire
valve

EC142A

Fig
EC

12
A
I
S

for
Non

CalifomitJ
Models

EC10
AJrpunip
air
cleaner

The
air

cleaner
ftlter
is

a
viscous

paper
type
and

requires
periodic
re

placement
The
air

pump
air

cleaner
i

bolted
to
the
carbon
canister

attaching

bracket

Fig
EC

13

AirPumpAirCl
an
r

Air

pump

The
air

pump
has
two

po
itive

displacement
vanes
which

require
no

lubricating
service

The
vane
rotate

freely
around
the

off
enter

pivot
pin
and
follow

the

circular

shaped

pump
bore

The
vanes

form
two
chambers
in
the

housing

Each
vane

complete
a

pumping

cycle
in

every
revolution
of
the

rotor

Air
is

drawn
into

tile
inlet

cavity

through
a

tllbe
connected
to
the
air

pump
air
cleaner
Air
is
sealed

between

the
vanes
and
moved
into

a
maller

cavity
the

compression
area

After

compression
a

yane

passes

the

outlet

cavity
Subsequently
it

passe
the

stripper
and

a
section
of

the

housing
that

parate
the
outlet

and
inlet

cavilies
and

again
reaches
the

inlet

cavity
to

repeat
the

pumping

cycle

Carbon
shoes
in

the
slots
of
the

rotor

upport
the
vanes

They
are

designed
to

permit
sliding
of
the
vanes

and
to
sealthe
rotor
interior
from

the

air

cavities
Leaf

springs
which

are

behind
the

leading
side
of
the

shoes

compensate
for
shoe
abrasion

The
front

bearing
uses
ball

bearing

and
the
rear

bearings
use
needle
bear

ings
The
vane
uses
needle

bearing
AU

bearings
have
been

greased
There

are

two

types
of

bearings
which

support

the

rotor
The

ball

bearing
is
used
for

the
front
and

the
needle

bearing
is

used
for

the
rear

Emission
Control

System

r

@
@
CD

L

I

1
Air

pump
drive
hub

5
V
ne

2

Housing
6
Carbon
shoe

3
Rotor

rins
7
Shoe

spri
ng

4

End
cover
8

Stripper

with
needle

bearing
9
Rotor
shaft

Anti
backfire
A
B
valve

This
valve
is
actuated

by
intake

manifold
vacuum
to

prevent
backfire

in
the

exhaust

system
at
the

initial

period
of
deceleration

At

this

period
the
mixture
in
the

intake
manifold

becomes
too
rich
to

ignite
and
burn
in

the
combustion

chamber
and

burns

easily
in

the
ex

haust

system
with

injected
air

in
the

exhaust
manifold

The
A

B
valve

provides
air
to
the

intake
manifold
to

make
the
air

fuel

mixture

leaner
and

prevents
backfire

To
in
take

manifold

vacuum

EC069

Fig
EC

15
A
B
Valve
10
Ball

bearing

11
Front

bearing
cOYer

12

Pulley

13

Pulley

for
air
conditioner

Check
valve

A

check
valve
is

located
in
the

air

pump
discharge
lines
The
valve

pre

vents
the

backflow
of
exhaust

gas

which
occurs
in

the

following
cases

I

When
the
air

pump
drive
belt

fails

2
When

relief
valve

spring
fails

1

11
rom

pump

1

Spring

2
Rubber
valve

3

Seat
SecondarY
air

4
J
Exhaust

gas

EC322

Fig
EC

16
Check
Valve

Air

gallery

The

secondary
air

fed
from
the
air

pump
goes

through
the
check
valve
to

the

air

gallery
in
the

cylinder
head
It

EC
lt
14
Inlet

cavity

15

Outlet
cavity

EC066A

Fig
EC
14
Air

Pump
two
vane

lype

is
then

distributed
to

each
exhaust

port
and

injected
near
the

exhaust

valve

0

iJl

Ai

gallery

2

Exhaust

port

3
Exhaust

manifold

EC316

Fig
EC

17
Air

Gallery

Air
pump
relief
valve

Non
California

models

The
air

pump
relief

valve
controls

the

injection
of

secondary
air
into

the

exhaust

system
when
the

engine
is

running
at

high
speed
under
a

heavily

loaded

condition
It

accomplishes
the