carb DATSUN 210 1979 Workshop Manual

Fig
EC
33
R

moving
Shoe

Springs

If

replacement
of
fron
t

bearing
is

necessary
proceed
as
follows

7
Remove
air

pump
drive
hub

with

standard

puller

8
Remove
screws

securing
front

bearing
cover
in

place
and

detach

bearing
cover

9

Support
the
rear
end
face

of
air

pump
housing
with
Rotor

Adapter

STI
9890000

Drive
rotor
out
by

push

ing
rotor
shaft
with

Bearing
Pressing

Tool
STI
9940000

STl9940000

JJr

STl9890000

EC303

Fig
EC
34

Removing
Rotor

Shaft

10

Support
the
fron
t
end
face
of

housing
with

Bearing
Stand

STI9930000
Attach

Bearing
Driver

STI
9910000
to
front

bearing
on
the

inside
of
air

pump
housing
and

press

out
I

STl9910000

1

c

R
9930000

II
EC304

Fig
EC
35
R

mouing
Ball
B

aring
Emission
Control

System

II

Keep
disassembled

parts
in

order

Assembly

Front

bearing

Support
the

rear
end
face
of
air

pump
housing
with
Rotor

Adapter

STI
9890000
Press
front

bearing
into

place
with

a

press
and

Bearing
Pressing

Tool
STI
9940000

I
I

J

j
71
EC306

Fig
EC

36

Pre88ing
Ball

Bearing

2

Bearing
cover

T

ighten
bearing
cover

securing

bolts

@
Tightening
torque

Bearing
cover
securing
bolts

0
1
to
02

kg
m

0
7
to

1
4
ft
Ib

3

Rotor
shaft

Support
the
in
ard
bottom
of
ro

tor
with
Rotor

Staild
STI
9920000

Press
rotor
into

place
with
a

press

and

Bearing
Driver
STI9910000
until

the

stepped
portion
of
rotor
shaft

touches
front

bearing
inner

race

t
7

STl9910000

STl9920000

i
I
EC307

Fig
EC
37

Pressing
Rotor

Shaft

Note

a
Be

sure
to
drive
front

bearing
inner

race
in

EC
15
b
After
rotor
is
installed
in

place

ensure
that
the

rotor
end
is

posi

tioned
helow
the
end

face
of
air

pump
housing

Position
of
rotor
end
below
air

pump
housing

0
050
to
0
150

mm

0
0020
to
0

0059
in

4
Air

pump
drive
hub

Support
the

inward
bottom

of
ro

tor
with
Rotor
Stand
STI
9920000

Press
drive
hub
into

place
with

a

press
and

Bearing
Driver
STI99l0000

until
the
end

face
of
drive
hub
touches

front

bearing
inner
race

H

STl99
10000

EC30B

Fig
EC

38
Pre

sing
A
ir

Pump
Drive

Hub

5

Carbon
shoe

I
Place
air

pump
drive
hub
in
a

vise

2
Clean

carbon
dust
etc
from

shoe

grooves

3

Align
rotor

with

housing
prop

erly
Then
insert
carbon
shoes
into

place
noting
their
directions

EC5
0

Fig
EC

39
Install
Carbon
Sho

Note

a
Carbon

sh
A

is
I
mm
0
04
in

wider
than
B
Do

not
confuse

them

b
If
carbon
shoes
are

exposed
beyond

the
rotor
end
face
remove
carbon

shoes
and
clean
shoe

grooves
Reas

semble
carbon
shoes

6

Vane

1
Pack

vane

bearing
with

high

melting

poinf
grease
MIL
G
3S45
A

Es

o
ANDOK260
or

equivalent
and

insert

dummy
shaft
into
the
vane

bearing

STl9900000

EC563

Fig
EC
40

Va
Assembly

2
Install
vane
in

place
on
rotor

uMng
Dummy
Shaft
STl9900000
as
a

guide

Note
The
woes

may

require
6
to
16

km
4
to
10
miles
wear
in
running

time
In
the
event

a

slight
squeaking

still
remains
drive
the
car

about
64

to
80

km
h
40
to
SO
MPH
In

most

cases
6

to
16
km
4
to
10

miles
will
be
sufficient
for
wear
in

7

Shoe

spring

Place
shoe

springs
in

deeper
groave

of
shoe

11

I

11

1

EC123

Fig
EC
4I
Ins

tolling
Shoe

Spring

Note
When

installing
a

shoe

spring

make
sure
that
the
outward
bend

ing
side
faces
in
shoe
and
that
both

ends
of

sJlri
face
in
the
wall
of
Emission
Control

System

shoe

groove
6e
Sure
to

push
spring

in

SO
that

spring
end
face
is
flush

with
rotor

8
Rotor

ring

Install
rotor

ring
by
correctly

align

ing
the
rear
end
face
of
rotor
with

the

on

mark
in
rotor

ring
and

tighten

screws
with

Hexagon
Wrench

ST
98
10000

l
l
Tightening
torque

Rotor

ring
screw

0
5
to
0

7

kg
m

13

6
to
5
1
ft
lb

Fig
EC

42
Installing
Rotor

Ring

9
Removal
of

dummy
shaft

CarefuDy
withdraw

dummy
shaft

from
vane

10
Vane
shaft

Pack
rear

bearing
with

high

melting

pain
t

grease
MIL
G
3S45
A

Esso
ANDOK
260
or

equivalent

Apply
thin

coating
of

grease
to
vane

shaft
and

rotor
ring
and
insert

vanf

shafi
into
its

bearing

Note

a

Do
not

apply
an
undue
stress
to

vane
shaft
when

inserting

b
If
two
vanes
are
dislocated
when

inserting
vane
shaft

correctly
align

Yanes

by
inserting
dummy
shaft

Then
draw
out

dummy
shaft
and

insert
vane
shaft

c
When
wear
occurs
on

vane
shaft
or

when

replacement
of
rear

bearing
is

necessary
replace
rear
rover
assem

bly

J
I

End
cover

Position
end

cover
in

place
Snugly

tighten
the
bolt
close
to
the
dowel

Then

tighten
end
cover

bolts

EC
t6
l
l
Tighteningtnrque

End
cover
bolts

0
7
to
0
9

kg
m

5
1

to
6
5
ft
bl

EC302

Fig
EC
43
lnstolling
End
Cover

12

Pulley

Tighten

pulley
securing
bolts

Tightening
torque

Pulley
securing
bolts

0
75

to
0
90

kg
m

5
4

to
6
5
ft

Ib

INSPECTION

The
following

procedures
are
re

commended
for

checking
and
or

as

certaining
that
the
various

components

of
the

exhaust
emission
control

system

are

opera
ting
properly

The

engine
and
all

components

mu
t
be
at
normal

operating

tempera

tures
when
the
tests
are

performed

Prior
to

performing
any
extensive

diag

nosis
of
the
exhaust
control

ystem
h

must

be
determined
that
the

engine
as

a
unit
is

functioning
properly

Air

injection
s

stem
hoses

Check
air

system
hoses
for
loose

connections
cracks
or
deterioration

Retighten
01

replace
if

necessary

Air

pump

I

Operate
engine
until
it
reaches

normal

operating
temperature

2

Inspect
all
hose
hose
connec

tions
and
air

gaDery
for
leaks
and

correct
if

necessary
before

checking

air

injection

pump

Note
When
tho
vaCUUm
hose

is
dis

connected

plug
it

up
or

engine
will

stumble

EC
47A

FiJ
Fig
EC
49

Disconnecting
Vacuum

Hose

from
C
A

C
Valve

5

Connect

hand
operated
vacuum

pump
in

place
and

manipulate
it
in

order

to

apply
a

pressure
of
2oo
to

250

mmHg
7
87

to
9
84

inHg

to

C
A
C

valve
Increase

engine
speed

to
3
000

rpm
and
confIrm
that

no
air

leaks
from
C

J
C
valve

Fig
EC

50

Checking
C
A
C

Valve

1

6
With
the
above

condition
discon

nect
air
hose
at
check
valve
and

plug
it

up
At
this

point
confirm

the
air

leaks

from

C
A

C
valve

ECl48A

Fig
EC

51

Checking
C
A
C
Volve
2
Emission

Control

System

7
If

teshesults

satisfy
3
4
5

and
6

the
C
A
C
valve

is

properly
function

ing

AIR
INDUCTION

SYSTEM
A
I
S

DESCRIPTION

The
air

induction

system
A
1
s
is

adopted
on
the
FU
model
and
Canada

models
and
is

designed
to
send
see

ondary
air
to
the

exhaust
tube
utiliz

ing
a
vacuum
caused

by
exhaust

pulsa

tion
in
the

exhaust
tube

Air
inductIon
valve

A
reed

valve

type
check
valve
is

installed
in

the
air

cleaner
When
the

exhaust

pressure
is
below

atmospheric

pressure

negative
pressure

secondary

air

is
sent
to
the
exhaust
manifold

When
the
exhaust

pressure
is

above

atmospheric
pressure
the

reed
valve

prevents

secondary
air

from

being
sent

back
to
the
air
cleaner

EC
t8
The

exhaust

pressure
in

the
exhaust

tube

usually
pulsates
in

response
to

the

opening
and

closing
of

the
exhaust

valve
and

it
decreases

below
atmos

pheric
pressure
periodically

If
a

secondary
air
intake
is

opened

to
the

atmosphere
under

vacuum
con

ditions

secondary
air

can
be

drawn

into

the
exhaust
tube
in

proportion
to

the
vacuum

Therefore
the
air
induction

system

A
I
s
reduces
CO

and
HC
emissions

in

exhaust

gases

operatiug
the
same
as

the
air

injection

system
A
I
s
The

system
cpnsistsof
an
air

in

tJctio

valve

a
filter
an

A
B
valve

and
hoses

fl

V

t

5

1

Air

ind9ction
valve

2
Air

c
eancr

3
Carburetor

4

Exhaust
manifold

5

Anti
obRcldlre
valve

EC919

Fig
EC
52

Ai
Induction

SYltem

1

Reed
valvo

2

Stopper

EC920

Fig
EC

53
Air
Induction

Val

Emission
Control

System

EXHAUST
GAS

RECIRCULATION

E
G
R
CONTROL

SYSTEM

DESCRIPTION
to
lower
the

spark
flame

temperature

during
combustion
This
results

in
a

reduction
of
the

nitrogen
oxide

NOx

content
in
the
exhaust

gas

When

the
E

G
R
control
valve

is

open
some
of
the
exhaust

gas
is
led
from
the

exhaust
manifold
to
the

E
G

R

chamber

through
the
E

G
R

passage
The

exhaust

gas
is

then
con

trolled
in

quantity
by
the
E

G
R

valve
and

is
introduced
into
the
intake

manifold

In

the
exhaust

gas
recirculation

system
a

part
of
the

exhaust

gas
is

returned
to

the
combustion

chamber

U
S
A

models

c

r

i

From
carburetor

EC309A

1
E
G
R
thermal
vacuum
valve

2
E

G
R
control

valve

3
Carburetor

4
E
G
R

passage

5
Intake
manifold
6
Exhaust
manifold

7

E
G
R

tube

8
Orifice

9
B
P
T
tube

10

B
P
T

valve

Canada
models

CD

o

1

Thermal
vacuum

valve

2
E
C
R
control
valve

3
Carburetor

4

E
C
R

passage
5
Intake
manifold

6
Exhaust
manifold

7

E
G
R

tube
Thermal
vacuum

valve

3
port
type
T
V
V

Thermal
vacuum
valve

2
port
type
T
V
V
for
FU
model
E
G
R
tube

E

G
R

control
valve

4

Thermal
vacuum
valve

2

port
type
T
V
v

E
G
R
tube

EC155A

Fig
EC
63
E
G

R

System

EC
21

Emission
Control

System

ATloN

The

operation
of
the
E

G
R

system
is

as
follows

U

S
A

models

Except
FU
model

Thermal

Water

temperature
Oc
OF

vacuum
valve
B
P
T
valve

Exhaust

pressure
mmH20
inH20
E
G
R

system

Below

SO
to

63

I22
to
145
Open
Exhaust

pressure

Below
21

to
33
0
82
to
1
30
Open

Not

actuated

Above

21
to

33
0
82
to

1
30
Closed

Exhaust

pressure

Open
Not
actuated

Aliove

Closed
Below
21
to
33

0
82
to
1
30

SO
to

63

I
22

to
145

Above
21
to
33

0
82

to
130
Closed

Actuated

FU
model

Water

temperature
Oc
F
Thermal
B

P
T
valve

E
G
R

system

vacuum
valve

Exhaust

pressure

mmH20
inH2O

Below
Below
21
to
33
0
82
to

1
30

Open

Closed
Not
actuated

40
to
63
104
to
145

Above
2
to

33
0
82
to
1
30
Closed

Above
Below
21

to
33

0
82
to
1
30

Open
Not
actuated

40
to
63
104
to
145
Open

Above
21
to

33
0
82
to
1
30
Closed
Actuated

Canada
models

Water

temperature
Oc
OF
Thermal

vacuum
valve
E

G
R

system

Below
40

to
63

I04
to
145

Closed

Not
actuated

Above
40
to
63

I04
to
145

Open
Actuated

E
G
R
control
valve

The
E

G
R
control

valve

controls

the

quantity
of
exhaust

gas
to
be
led

to
the
intake

manifold

through
vertical

movement
of
the

taper
valve
con

nected
to
the

diaphragm
to
which
vacuum
is

applied
in

response
to
the

opening
of

the
carburetor
throttle

valve

E
G
R

control
valve
construction

and

type
vary
with

transmission

type
and
car
destination
For
identification

purposes
the

part
number

is

stamped

on
the
recessed

portion
at
the

top
of

the
valve

EC22

1l

I

I

1J

1

Diaphragm
spring

2

Diapliragm

3
Valve
shaft

4
Valve

5
ValVe

seat

6
Valve
chamber

EC231

Fig
EC
64
E
G
R
Control
Value

Thermal
vacuum
valve

2

port

type

FU
and
Canada
models

The
2

port

type
thermal
vacuum

valve
is
mounted
on
the

engine

thermostat

housing
It

detects

engine

coolant

temperature
by
means
of
a

built
in

bi
metal
and

opens
or
closes

the
vacuum

passage
in
the

thermal

vacuum
valve

When
the
vacuum

passage
is

open

the

carburetor
vacuum

signal
is

applied

to
the

diaphragm
of
the
E
G
R
con

trol

valve
to
actuate
the

taper
valve

connected
to
the

diaphragm

1

Spring

2

Bi
metal

3
O

ring

EC232

Fig
EC
65
Thermal
Vacuum
Valve

2

port
type
Emission
Control

System

Thermal
vacuum
valve

3

port
type

U
S
A
models

except

FU

model

The
3

port
type
thermal

vacuum

valve
is
located

on
the
rear

end
of
the

cylinder
head

It

defects

engine
coolant

tempera

ture

by
means
of
wax

expansion
and

opens
or
closes
the
air

passage
from

the
air

cleaner

When

the
air

passage
is
closed
the

carburetor
vacuum
signal
is

applied
to

the

diaphragm
of
the
E
G
R

control

valve
to
actuate
the

taper
valve
con

nected
to
the

diaphragm
This
valve
is

also
co
used
as
a

component
for
the

Spark
Timing
Control

System

JiI2
To
air
cleaner

From
B
P
T

valve

From
distributor

EC156A

Fig
EC
66
Thermal
Vacuum
Valve

3

port
type

B
P
T
valve

The
B
P

T
valve
monitors
exhaust

pressure
to
activate
the

diaphragm

controlling
intake

manifold
vacuum

applied
to
the
E
G
R

control
vaNe
In

other
words
the

amount
of
recirculat

ed
exhaust

gas
vari

s
with
the

position

of
the
E
G
R

valve

regulated
by
the

operating
condition
of
the

engine

EC
23
To
E

G
R

control
valve
Vacuum
nal
Curce

Air
bleed
1

Exhaust

pressure

EC310A

Fig
EC
67
B
P
T
Value

REMOVAL
AND

INSTALLATION

E
G
R
control
valve

I
Disconnect

vacuum
hose
and
re

move
nuts

securing
E
G
R

control

valve
to
E

G
R

passage
The
E

G
R

control
valve

can
then
be
taken
out

Fig
EC

68

Remouing
E
G
R

Control
Valve

CAUTION

Pay
attention

not
to

give
damage
to

packing
of
E
G
R

control
valve

2

Installation
is
in

the
reverse
se

quence
of
removal

Note
In

installing
new
E
G
R

control

valve
confirm
that

the
model

num

ber
and

identification
marks
at

the

top
of
valve
are

as
follows

CAUTION

Do
not
allow
water
to

get
inside
the

thermal
vacuum
valve

EC161A

Fig
EC
77
Ch

c

jng
Th
rmal
Vacuum

Valve

3

port
type

Thermal

vacuum

valve

2

port
type

Dismount
thermal

vacuum
valve

from

engine

Note

Before

dismounting
drain
en

gine
c
oolant
from

engine

Apply
vacuum
to
thermal

vacuum

valve
and

check
to
be
sure

that
ther

SPARK
TIMING

CONTflOL

SYSTE
VI

DESCRIPTION

The

spark

timing
control

system
is

designed
to
control

the
distributor

vacuum
advance

under

varying

driving

conditions
so

as
to
reduce
He
and

NOx
emissions
Emission
Control

System

mal

vacuum
valve

opens
or
closes
in

response
to

engine
coolant

tempera

ture

as

specified

Thermal

vacuum
valve

should

open

at

a

temperature
specified
below

com

pleting
the
vacuum

passage

Thermal

vacuum
valve

opening

temperature

40
to

63
c
104
to
1450

Fl

CAUTION

00

not
allow
water
to

get
inside
the

thermal1
acuum
valve

Jl
i

g

J

eC
42

Fig
EC
78
Ch

ckjng
Thermal
Vacuum

Valve

M
T
model

When

the
transmission

is
shifted

into
the

4th
or
5th

gear
the
electric

current
flows
into

the
vacuum

switch

ing
valve
The
vacuum

switching
valve

is

then
actuated
and

close
the
vacuum

passage
As

a

res
li
the

distributor

fully
advances

its

ignition

liming

When
the
transmission
is

shifted

into

any
gear
other

than
4th
and
5th

current
flow
is

interrupted
The

vacu

umswitclting
valve
is

then
deactuated

and
the

vacuum
leak

passage
is

E026
BoP

T
valve

1

DiSCOIUlect
two
vacuum
hoses

on

BY
T
valve

2

Plug
one
of
two

port
of
BY
T

valve

Apply
a

pressure
above
SO

nimH20

1
97

inHP
to
B
P
T
valve
and

orally
suck
back
other

port
of
B
P
T

valve

as
shown
below

to
check
for

leakage
If

a
leak
is
noted

replace

valve

Apply
pressure
above

SO
mmH10
2
inH10

EC311A

Fig
EC
79

Checking
B
P
T
Valve

opened
This
weakens
the
vacuum

signaUransmitted
from
the
carburetor

As
a
result
the

ignition
timing
of
the

distributor
is

slightly
advanced

On
U
s
A
models

except
for

the

FU
model
a
thermal

vacuum
valve

3

port
type
is
added
on
the

vacuum

line
between
the
carburetor
and
dis

tributor

The
vacuum

signal
is
controlled

by

this
thermal

vacuum
valve

in
accord

ance
with
variation

in

engine
cooling

water

temperature

Emission

Control

System

AfT
models

Spark
timing
control

systems
on

Arc
models

are
divided
into
3

types

On
California

models
a

top
detect

ing
switch
i3

added
on
the
line

pressure

circuit
beside

the
transmission
case
The
vacuum

switching
v
iJve

and

thermal
vacuum
valve

3

port

type

control

the

spark
advance

by
the

engine
cooling
temperature
and

gear

position

On

non
California
models

excpt

AfT
models
Califomle
models

Distributor

To
B
P

T

valve

1
Orifice

i1J

1
ICh

OJ

L
J
To
air

cleaner

Fu

EJ
Top
5witch

D3
R
ON

Others
4
OFF

Battery

Non
californla
models

except
Canada

To
air
cleaner

l

o

o
0

Ig

o

g
00

00
00

r
Vacuum

delay
valve

Thermal

vacuum

valve

Water

temperature

OC
OF
Thennal

vacuum

valve

Oosed
Ignition
timing

Below
5
10
18

41
io
64

Between

5
to

IB
and

50
to
63

411064
and
122
10
145

Above
50
to
63

122
to
145
Fully
advanced

PartiaDy
advanced

Open

Fully
advanced
Oosed

EC2a
Water

temperature

OC
oF

Bdow

51018
41
to
64

Between

5
to
18

and
50
10
63

411064
and

12210145

Above
50
to

63

122
to

145

Distributor

Carburetor

J

l
Canada
the
thermal

vaCUUDl

Vl
lve

3

port
type
and
vacuum
delay
valve

control
the

spark
advance

On

Canada
models
the
vacuum

delay
valve
is
installed

midway
on
the

vacuum

passage
from
the

carburetor

to

the
distributor

Transmission

gear

position
Thermal

vacuum

va1ve
Ignition
timing

R
and

D

3
FuBy

advanced

Other
than

Rnand

D
3
Oosed

Partially

advanced

R

a
gd

D
3

Other
than

R
and

0

3
Partially

advanced
Open

R
aud

D

3
Fully

advanced

Other
than

R
and

m
3
Oosed

Partially

advanced

Canada
models

Vacuum

delay
valve
Distributor

Carburetor

J

l

EC163A

Fig
EC
81

Spark

Timing
Control

Sy
tem

Af1

J

gear
box

I
Disconnect

a

pair
of
lead
wires

2
Unscrew
the
switch

body
itself

The

switch
can
then
be
taken

out

3

Installation
is
in
the
reverse
se

quence
of
removal

dl
Tightening
torque

Top
cietectingswitch

2
0
to
3
0

kll
m

14
to
22

fHbl

@

EC892

Fig
EC
89

Remouing
Top

Detecting

Switch

Top
detecting
switch

For

AfT
models

The

top
detecting
switch
is

installed

on
the
side
face
of
the

gear
box

I

Disconnect
a
lead
wire

for

top

switch

2

Loosen
switch
itself

Switch
can
then
be
taken
out

Note

When
the

switch
is

remo
ed

automatic

transmission
fluid

flows

out

Prepare
some

rugs
to

prevent
the

fluid
rom

flowing
out

EC169A

Fig
EC
90

Remouing
Top

Detecting

Switch

An
models

3

Insta
tion

is
in

the
reverse
se

quence
of

removal
Emission
Control

System

dl
r

ingtorq

Top
detecting
switch

2
0
to
3
0

kll
m

14

to
22
ft

bl

Thermal
vacuum
valve

3

port
type

The

thermal
vacuum
valve
is
instal

led

on
the
rear
end
of

the

engine

cylinder
head

I

Drain

engine
coolant
about

one

liter

lUllS
qt
Ulmp
qt

2

Remove
manifold

nut

securing

heat
shi
eld

plate

r

l

EC170A

Fig
EC
91

Remouing
Hoot
Shield

Pwte

3
Disconnect
3
vacuum
hoses
and

unscrew
valve

itself
Valve
can
then
be

taken
out

4
Install

thermal

vacuum
valve
in

the

reverse

sequence
of

removal
At

this
time

the
valve
should
be

tighten

ed
to

a
tilt

angle
of
300

Note
Be
sure
to

apply
oealer
to

threads
o
the
valve

prior
to
instal

ling
new

valve
t
J
T1g11taning
torqUe

Thermal

cuum
waive

Less
than

2
2

kll
m
16
ft

bl

Manifold
nut

1
5

to
2

0kg
m

11
to
14
ft

bl

From
distributor

From
B
P
T

valve

From
air
cleaner

ECl71A

Fig
EC

92

mtalling
Thermal
Vacuum

Value
3

port
type

Vacl
ul11

delay
valVe

The
vacuum

delay
Valve
is

installed

on
the

midway
o
the
vacuum
tube

between

the
carburetor
and
distributor

vacuum
advance
mechanism

In

installing
the
valve
make
sure

that
the
brown
face

sid
is
connected

to
the
carburetor

side

Carburetor
sid

C
r

i

J

EG
30
Distributor

side

One
way

umbreDa
valve

Sintered
metal
disc

EC277

Fig
EC
93
In

tolling
Vacuum

Deloy
Value

e

In
o

L

1

Ignition
switch

2
Vacuum
switching

v3
lve

3

Top
detecting
switch

4
Function
check
connector

EC330A

i

Fig
EC
99

Checking
Top
Detecting

l

Switch

Vacuum

dela
valve

Remove
vacUum

delay
valve

2

Blow
air
from
th

port
of

the

distributor
side
The
vacuum

delay

valve
is
in

go
ij
condition
if
the
air

flows

through
the
valve

3

Try

again
from
the
opposit

side

of
the
valve
Th
valve
is
in

goo

condition
if
th
a
flow
resistance
is

greater
than

the

step
2
abov

Distributor
side

Carburetor
side

Distribu
tor
side

Carburetor
side

EC346

Fig
EC
100

Checking
Vocuum

Dewy
Valve
Emission

Control

Syst
m

4

If
the
condition
of

spark
delay

valve
is

questionable
dip
port
into

a

cup
filled
with
water
Blow
air
from

brown
face
side
Small
air
bubbles

should

appear

CAUTION

Be
c
areful
to
avoid

entry
of
oil
or
dirt

into
valve

7

E
C279

Fig
EC
101

Checking
Vacuum

D

lDy
Valve

CATALYTIC

CONVERTER

California
dels

DESCRIPTION

1

The

catalytic
converter

accelerates

the

chemical
reaction
of

hydrocarbons

CD
0
He
and

carbon
monoxide
O
in

the
exhaust

gas
and

changes
them
into

non
harmful

carbon
dioxide

C02

and
water

H20
This
chemical

reac

tiOD

process
requires
the

proper
a

mount
of
air
which
is

supplied
by
the

air

pump
Refer
to
the
item
AJ

S

This
air
is
called

secondary
air

The

Catalytic
converter
is
mounted

0

the
models
destinbd
for
California

OPERATION

Exhaust

gas
emitted

from
the
en

gine
contains

some
harmful
substances

due
to

incomplete
combustion
in

the

combustion
chamber
The
air

injection

stem
i

designed
to
reduce
the

con

tent
of

such
substances
in

the
exhaust

gas
In
this

system
the

secondary
air

is

led
from
the
ch
ck
valve
and

injected

in
o
the

exhaust
manifold
With
this

injection
of

the

secondary
air

hydro

carbons

He
and
carbon
monoxide

CO
in
the

exhaust

gas
are
gradually

oxidized
with

oxygen

02
in
the

secondary
air

and
converted
into
nOD

harmful
carbon
dioxide

C02
and

water

HP

The

catalytic
converter
further

cleans

engine
exhaust

gas
Through

catalytic
action
it

changes
residual

hydrocarbons
and

carbon
monoxide

contained
in

exhaust

gas
into

carbon

dioxide
and
water
before
exhaust

gas

is

discharged
to
the

atmosphere

0

Secondary
air

Carbon
monoxide

hydrocarbon

Carbon
dioxide

gas

Nater

EC

i

A

I
Front
tube

2

Catalytic
converter

3
Center
tube

4
Main
murner

EC
33
EC215

Fig
EC

I02
Function
of

Catalytic
Converter