DATSUN 210 1979 Manual Online

2
Loosen

belt
then
remove
fan

blade
from

torque
coupling
and

torque
coupling
and

pulley
from

hub

Air

conditioning
system
equipped

models

only

4
Remove

pump
assembly
and

gas

ket
from
front
cover

C0051

Fig
CO
3

Removing
Water

Pump

INSTALLATION

1
Be
sure
to
clean
the

gasket
sur

faces
in
contact
with

pU
flP
and
front

cover

Always
use
new

gaskets
when

installing
pump
assembly
Be

sure
to

tighten
bolts

i
l
Tightening

torque

Water

pump

securing
bolts

0
9
to
1
4

kg
m

6
5
to
10
1
ft
Ib

2
Fill

cooling
system
and

check
for

leaks
at

pump

3

InstaD
fan

pulley

spacer
or

torque

coupling
and

fan
blade

and

tighten
attaching
bolts

securely
Install

belt

and

adjust
for

specified
tension

4

Operate
the

engine
at

fast
idle

and

re

Check
for
leaks

S

Install
fan

shroud

Note

Ensure
that
clearance
between

shroud
and
fan
even
at

any

place

DISASSEMBLY

Water

pump
should
not
be
disas

sembled
Cooling

System

INSPECTION

Inspect
pump
assembly
for
the

following
conditions
and

replace
if

necessary

I

Badly
rusted

or
corroded

body

assembly
and
vane

2
Excessive
end

play
or

roughness

of

bearings
in

operation

Note
If

excessive
mechanical
seal

squeak
occurs
when

engine
is
mn

ning
use
suitable
water

pump
seal

lubricant
to

prevent
squeak

ADJUSTMENT

Check
belt
deflection
between

alternator
and

fan

pulley
by
a

force
of

10

kg
22
Ib

Fan
belt
deflection

8
to
12

mm

0
31
to
0
47
in

If

adjustment
is

necessary
loosen

bolt

retaining
alternator

adjusting
bar

to
alternator
Move
alternator
toward

or

away
from

engine
until
the

correct

tension
is

obtained

TORQUE
COUPLING

The

torque
coupling
keeps
the
fan

speed
at
2
900

rpm
rated

or
below
to

conserve

horsepower
at

high

engine

speed
It
also

helps
reduce
fan
noise
to

a
minimum

during
high
speed
opera

tion

This
unit
is
filled
with
a

special

silicone
oil
used

as
a
fluid

coupling

which
controls
the

fan

speed
Silicone

oil

can
not
be

replenished

The

torque
coupling
is
installed

only
on
the
model

equipped
with
the

air

conditioning
system
In
this
case

use
7
x
350
mm

13
78
in
diam

eter

cooling
fan

CO
3
C0052
t
Wheel

2
Disc

3

Bearing

Fig
CO

4

Torque
Coupling

REMOVAL

Lousen
fan

belt

2
Remove

fan
blade
from

torque

coupling

3
Remove

torque

coupling
from

pulley
and
water

pump
hub

by
re

moving
securing
nuts

INSTALLATION

I
InstaD
the

torque
coupling
in
the

reverse
order
of
removal

2
Install
belt
and

adjust
belt

ten

sian

DISASSEMBLY

The

torque
coupling
is
so

designed

that

it
can
not
be

disassembled

INSPECTION

Inspect
torque

coupling
for
oil

leak

age
If

necessary
replace

Cooling
System

TEM
COUPLlNG

Non
Califomia

model

equipped
with
air

conditioning

Tem
coupling
is

a

type
of
fan

coupling
which
is

provided
with
a

temperature
control

system

The
conventional

coupling
always

slips
the
fan
at

a

high

speed
under
a

constant

ratio

regardless
of
the

engine

cooling

requirement

The

slipping
ratio
of
the
Tem

coupling
however
is

properly
changed

with
the

cooling
requirement

ON
denotes
that

cooling
is

required
and
the
fan

operates
up
to

about
2

900rpm
When

high
cooling
is

not

required
during
cold
season
with

the

engine
warmed

up
etc
the

oper

ation

is

placed
under
OFF
condition

and
the
fan

slips
at
about
2

050

rpm

The
coiled
bimetal
thermostat

installed
on
the
front
center

portion
of

the
Tem

coupling
detects

temperature

of
air

passing

through
the
radiator

The
air

temperature
is

directly

relative

to
the

engine
coolant

tempera

ture

and
the
inside
slide
valve

is

opened
or

closed
as

required
and
thus

the
ON
OFF
control
is

performed

When
the
air

temperature
rises

the

bimetal
is

expanded
and
the
valve
is

opened
silicone

oil
is
forwarded

to
the

groove
that

transmits

torque
and
the

system
is

placed
under
ON

con

dition

When

the
valve
closes
silicone
oil
is

not

supplied
to
the

groove
oil
in

the

groove
is
accumulated

on
the
Tem

coupling
periphery
due
to
the
centrifu
1
Bi
metal

thermostat

2

Slide
valve

3

Reserve
chamber

fOl
OFF

4

Bearing

5

Coupling
part
labyrinth

6
Driven

part

C0130

Fig
CO
5

Tem

coupling

gal
force
and
led
into

the
reserve

chamber
Now
oil
is
eliminated
from

the

groove
and
the

system
is

placed

under
OFF
condition

With
this

system
when
fan

cooling

is

not

required
the

output
loss

IS

miniinized
and
noise
can
be
far

reduced

Q

i
tionalCOUPling

WATER
PUMP

SPEED

Q

ON

OFF

Tem
coupling

WATER
PUMP

SPEED

C0029

Fig
CO

6
Characteristic

of

Tern

coupling

I

SPECTION

Check
Tem

coupling
for

oil

leakage

or
bend
of
bimetaL

If

the
above

symptoms
are
found

replace
it

with
a
new
one
as
an

assembly

CO
4
THERMOSTAT

REMOVAL
AND

INSTALLATION

I
Drain

cool
nt

partiaUy

2

Disconnect

upper
radiator

hose
at

water

outlet

3

Disconnect
air

hose
for

air

injec

tion

systein
at
check
valve

Fxcept

FU

models

4

Loosen
belt

for
air

injechon

system
by
loosening
idler

pulley
se

curing
nut

and

adjusting
bolt

Except

FU
models

CD
@
ID

I

2

3
C0053

Idler

pulley

Nut

Water
outlet

Fig
CO
7

Disconnecting
Air
Hose
and

Loosening
Belt

Except
FU
models

5
Loosen
bolts
and
remove
idler

pulley
bracket

Except
FU
models

6
Disconnect
air

induction

pipe

FU
models

7
Remove

bolts
and
remove
water

outlet

gasket
and
thermostat
from

thermostat

housing

I

Thermostat

2
Air
check
valve

Except
FU
models

3
Water
outlet

Fig
CO

Removing
Thennostat

8

After

checking
thermostat
rein

stall
with
a
new

housing
gasket
in

place

9
Reinstall
water
outlet

10

Replenish
coolant
and

check
for

leaks

INSPECTION

I

Submerge
thermostat
in

hot

water
SOC
90F
above
the

specified

temperature
Refer
to
Service
Data

and

Specifications

2

After

preparing
for
the
marked

screwdriver

at
about
8

mm
0
31
in

from
the

tip
inspect
the
lift

height

H
of
valve

by

inserting
it

f

C0097

Fig
CO
g
In

pecting
Thermostat

3
Now

place
thermostat
in

water

SoC
90F
below
the

specified
temper

ature

If
thermostat
does
not

operate
at

the
above

specified
temperature
it

must
be

replaced
because
it
cannot
be

repaired

Note

If

necessary
check
a
new
ther

mostat
before

installing
it
in

the

engine

RADIATOR

The
radiator
filler

cap
is

designed
to

maintain
a

pre
set

pressure
0
9

kgfcm2

13

psi
above

atmospheric

pressure

The
relief
valve

consisting
of
a

blow
off
valve

and
a

vacuum
valve

helps
to

prevent
the

coolant
from

boiling
by
giving

pressure
to
it
How

ever
when
the

pressure
is

reduced

below

atmospheric

pressure
the
vacu

wn
valve
allows
air
to

re
enter
the

radiator

preventing
the
formation
ofa

vacuum
in
the

cooling
system

On
models

equipped
wi

th
the
au
to

malic

transmission
the
oil
cooler
is
Cooling
System

combined
with
the
radiator
to

cool

transmission

fluid

REMOVAL
AND

INSTALLATION

1
Drain

coolant
into
a

clean
con

tainer

2
Disconnect
radiator

upper
and

lower
hoses

On
models
with
automat

ic

transmission
disconnect
cooler
inlet

and
ou
tlet
lines

from
radiator

3
Rem
Ne
fan
shroud

retaining

bolts
and
remove
fan
shroud

4
Remove
radiator

retaining
bolts

and
then

remove
radiator

upward

S
I

nstaD
radiator
in

the
reverse
se

quence
of
removal
Note
the
fol

lowing

I
Insert

hoses
in
their

positions

until

they
bottom

2
Ensure
that
arrow
marks
on

hoses

are
clearly
visible
from

upper

direction

when
hoses
are
assembled

3
Ensure
that
clearance
between

radiator
hose
and

any

adjacent
parts
is

30
mm
1
18
in
min
On
air
condi

tioner

equipped
models
a
minimum

clearance
of
18
mm
0
71
in
should

exist
between

compressor
and
hose

4

Ensure
that

clearance
be
tween

shroud
and
fan
is

even
at
any
place

Note
Be
careful
not
to

damage
radi

ator
fins
and
core
tube
when
install

ing

INSPECTION

Radiator

cap
should
be
checked
for

working
pressure
at

regular
tune

up

intelVals
First
check
rubber
seal
on

cap
for
tears
cracks
or
deteriontion

after

cleaning
it
Then
ins
taD
radiator

cap
on
a

tester
If

cap
does
not
hold

or

will

not
release
at
the

specified
pres

sure

replace
cap

Fig
CO
lO

Testing
Radiator

Cap

CO
5
Also

inspect
radiator
for

leakage

using
cap
tester
and

applying
a

pres

sure
of
1

6

kgfcm2
23

psi

If

a

leakage
is
detected

repair
or

replace
radiator

ET116

Fig
CO
II

Testing
Cooling
System

Prtuurt

RADIATOR

RESERVOIR
TANK

OPERATION

The
radiator
reservoir
tank
is

mounted
to
the

right
hand
side
core

support
through
the
bracket
When

the

coolant

temperature
in
the
radiator

rises

and

pressure
builds

up
to
an

extent
the

pressure
relief
valve

provided
in

the
radiator

cap

opens
to

release
excess
coolant
into

the
re

servoir

tank
When
the
coolant

temper

ature
lowers
and

pressure
decreases
in

the
radiator
the
vacuum
valve

provid

ed

in
the
radiator

cap
opens
to
allow

the
coolant
to

re
enter
the
radiator

u

V

O
I

MAX
Ii

1i

i

iT

1
I

I

11

1

i

MINij

o

f

G

p

rl

MAX
ii
i

p

It

ot

MINi
II

L
Cooling
System

l

CQ074

Pressure
relief
valve

opens

f

C007S
Vacuum
valve

opens
INSPECTION

1
Check
the
amount
of

coolant
in
the

reservoir
tank
If
the
coolant
level

is

below

the
MIN
level
remove

the
re

servoirtank
ruler

cap
and
add

enough

oolant
to
reach
MAX

level

If
the
reservoir
tank
is

empty

check

the
coolantlevel
in
the

radiator

If
the
coolant
in

the
radiator
is

insuf

ficient

pour
it
into

radiator

up
to
the

radiator

cap
and

also

pour
it
into
the

reservoir

tank
until
MAX

level

If
the

coolant
in
the
reservoir
tank

d
ecreases

abnormally

rapid
check
for

a
leak
in
the

cooling

system

REMOVAL
AND

INSTALLATION

1
Reservoir
tank
is

only
inserted
to

reservoir
tank

bracket
and
can
be

easily
removed

To
install
reservoir
tank
reverse
the

order
of

remova

Fig
CO
12

Opefation
of
ReserVoir
Tank

SERVICE
DATA
AND

SPECIFICATIONS

Thermostat

Valve

opening

temperature
Oc
OF

Maximum

valve
lift

mmjOC
in
oF

Radiator

Type

Manual
transmission

Automatic
tralUJ1lission

Cap
relief

pressure
kg
cm2

psi

Testing
pressure

kg
cm
2

psi

Fan

Fan

belt
deflection

mm
in

cO

6
Temperate

type
Frigid
type
Tropical
type

82

180
88

190
76
5

I
70

8

95
8
loo
8
90

0
3
I

203
0
31j2
i
2

0
31
194

Corrugated
fm

type

Corrugated
fm

type
equipped
with
oil
cooler

0
9

I
3

1

6
23

8
to
12

0
31
to
0
47

Condition

Loss
of

water

Poor
circulation

Corrosion

Overheating

Over

cooling
Cooling
System

TROUBLE
DIAGNOSES
AND
CORRECTIONS

Probable
cause

Damaged
radiator
seams

Leaks

at
heater
connections

or
plugs

Leak
at

water

temperature
gauge

Loose

joints

Damaged
cylinder
head

gasket

Cracked

cylinder
block

Cracked

cylinder
head

Loose

cylinder
head
bolts

Restriction
in

system

Insufficient
coolant

Inoperative
water

pump

Loose
fan
belt

Inoperative
thermostat

Excessive

impurity
in
water

Infrequent
flushing
and

draining
of

system

Inoperative
thermostat

Radiator
fin
choked
with
mud
chaff
etc

Incorrect

ignition
and
valve

timing

Dirty
oil
and

sludge
in

engine

Inoperative
water

pump

Inoperative
torque
coupling
or

tem

coupling

Loose
fan
belt

Restricted
radiator

Inaccurate

temperature
gauge

Impurity
in
water

Inoperative
thermostat

Inaccurate

temperature
gauge

CO
7
Corrective
action

Repair

Repair

Tighten

Tighten

Replace

Check

engine
oil
for

contamination
and
reml

as

necessary

Replace

Check

engine
oil
in

crankcase
for

mixing

with
water

by
pulling
oil

level

gauge

Replace

Tighten

Check
hoses
for

crimps
and
clear
the

system

of
rust
and

sludge
by
flushing
radiator

Replenish

Replace

Adjust

Replace

Use
soft
clean
water
rain

water
is
satis

factory

Cooling
system
should
be
drained
and
flush

ed

thoroughly
at
least
twice
a

year

Permanent
antifreeze

Ethylene
glycol
base

can
be

used

throughout
the

seasons
of
the

year
and

change

periodically
at

intervals

recommended

Replace

Clean
out
air

passage
thoroughly
by
using
air

pressure
from

engine
side
of
radiator

Adjust

Refill

Replace

Replace

Adjust

Flush

radiator

Replace

Use
soft
dean
water

Replace

Replace

DATSUN
210
Model
8310
Series

SECTIONEF

ENGINE
FUEL

CONTENTS

AUTOMATIC
TEMPERATURE

CONTROL
A
T
C
AIR
CLEANER

DESCRIPTION

OPERATION

REMOVAL
AND
INSTAllATION

INSPECTION

IDLE
COMPENSATOR

DESCRIPTION

INSPECTION

FUEL
FILTER

DESCRIPTION

FUEL
PUMP

OPERATING
TEST

REMOVAL
AND
INSTAllATION

DISASSEMBLY
EF
2

EF
2

EF
2

EF
3

EF
4

EF
5

EF
5

EF
5

EF
6

EF
6

EF
6

EF
6

EF
7

EF
7
INSPECTION

ASSEMBLY

CARBURETOR

DESCRIPTION

STRUCTURE
AND
OPERATION

INSPECTION
AND
ADJUSTMENT

MAJOR
SERVICE
OPERATION

TROUBLE
DIAGNOSES
AND

CORRECTIONS

SERVICE
DATA
AND

SPECIFICATIONS

GENERAL

SPECIFICATIONS

INSPECTION
AND
ADJUSTMENT

TIGHTENING
TORQUE
EF
7

EF
7

EF
B

EF
B

EF
B

EF
14

EF
23

EF
30

EF
32

EF
32

EF

32

EF
34

Engine
Fuel

AUTOMATIC
TEMPERATURE
COtirROL
A
T

C

AIR
CLEANER

DESCRIPTION

U

S
A

mode
18

ExC
FU

model

I

C1J
Cana
ia
and
FU

models

I
Air

relief
valve
Non

alifornia

models

2

Air
hole
for
T
C

S

3
P

C
V

mter

4
Air

hole
for
A
B

valve
5
Idle

compensator

6
Outlet
for
C
A

C
valve

California
model

7

Temperature
seIl50r

8

Heat
control
valVe

EF415A

Fig
EF
l
A
T
C

Air
Cleaner
U
S
A
model

except
FU
model
8
3

1

Air
hole

for
T

C
S

2

Air
induction
valve
and

ftIter

3
P

C
V

mtet
Air

hole
for
A
B

valve

Idle

compen
ator

Temperature
sensor

Heat
control
valve

EF041A

Fig
EF
2
A
T
C
Air
Cleaner
Canado
ond
FUmodel

The

automatic

temperature
control
system
of

the
air

cleaner
is

control
ed

by
the
inlet
air

temperature
and
the

load
condition
of
the

engine
The
inlet
air

temperature
is
detected

by
th

sensor
and
the

vacuum
motor
is

actu

ated

by
the

engine
intake
vacuum
OPERATION

Engine
Under
hood
air

temperature
Sensor
vacuum
at

vacuum
motor

side
Air

con
trol
valve

operation
Sensor

operation

Below
380e

IOO
F
Below
40

mmHg

1
57

inHg
Open
cold
air

AI4
A15
Above
160

mmHg

6
30

inHg
Closed

Closed
hot

air

38
to

S40C

100

to
l290F
Partially
open

cold
air
hot
air
Partially
open

Above
550e

1310F
Open
cold
air

Open

HOT
AIR

OPERATION

When

the

engine
intake
air

tempera

ture
is

low
the

sensor
air
bleed
valve

remains
in

the
closed

position
and

establishes
vacuum

passage
betw

n
the
intake
manifold
and

vacuum

motor
With

this
condition
the
vacu

um
at

the
intake
manifold
side

actuates
the
air

control
valve
attached
to
the

vacuum
motor

diaphragm
to

introduce
hot
air
into
the
air
cleaner

through
the
hot
air

duct
on
the
ex

haust
manifold

EF
2

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

its

spring
force
to
close

within
30

seconds

replace
vacuum
motor

as
an

assembly
since
this

may
be
resulted

from
air
leak

at
vacuum
motor
dia

phragm

TEMPERATURE
SENSOR

If
tests
indicate
that
A
T
C

system

is

malfunctioning
and
motor
is
func

tioning
properly
check
temperature

sensor
for

proper
operation

Confirm
that

engine
is

cold
before

starting
tests

Start

engine
and

keep
idling

Immediately
after

starting
engine

disconnect
vacuum
motor
inlet

vacu

um
hose

and
make

suce
that
intake

vacuum
is

present
at

end
of
vacuum

DESCRIPTION

The
idle

compensator
is

basically
a

thermostatic
valve
which

functions
to

introduce
the
air

directly
from
the
air

cleaner
to
the
intake
manifold
to

compensate
for
abnormal
enrichmerit

of
mixture

in

high
idle

temperature

The
bi
metal
attached
to
the
idle

compensator
detects

the

temperature

of

intake
air

and

opens
or

closes
the

valve
Two

idle

compensators
having

different

temperature
characteristics

are
installed

one

opens
at
an
intake
air

temperature
of
60
to
700C

140
to

IS80F
and
the
other

at
70

to
800C

158
to

1760
F

EF222
1

Orifice

2

Bi
metal

3
Rubber
valve

Fig
EF
ll

Idle

Compensator
Engine
Fuel

hose

If
vacuum
is
weak
or
is
not

present

at
all
check
vacuum
hoses
for

leakage

Replace
temperature
sensor
if
vacuum

hoses
are
in

good
order

EF978

Fig
EF

l0
Checking
for
Pressure

of

Intake
Vacuum

IDLE

COMPENSATOR

INSPECTION

I
Check
that
valve

is
in
closed

position
when

bi
metal

temperature
is

lower
than

operating

temperature
To

check
breathe
air
into

tube
or

suck

air
If
excessive
air

leakage
is
found
at

the
valve

replace
idle

compensator
as

an

assembly
Note
that
two
idle

com

pensators
are
mounted
to
air

cleaner

and
that
it
is
ne

essary
to

plug
the

valve

of
one
of
these
idle

compensa

tors
so
as
to

prevent
air
leak
while

checking
the

other
one

I

t
I

I
Orifice

2
Rubber
valve

EF225

Fig
EF

12
Checking
Idle

Compensator

Note
When

checking
idle

compensa

tor
on
car
disconnect
hose

leading

EF

5
2

Reconnect
vacuum
hose
to

vacu

um

motor
and
warm

up
engine

3

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
air
control
valve

does
not

open

check
air
control

valve

linkage
for

binding
Replace
temperature
sensor
if

air

control
valve

linkage
is

functioning

properly

to
idle

compensator
and
connect

other
hose
then

carry
out
check
as

described
above

2
Warm

up
engine
completely

3

Open
engine
hood
and
remove
air

cleaner
cover

4

Direct
warm
air
to
idle

compensa

tor
with
a

heat

gun

And

measure

operating
temperature

of
idle

compensator

EF043A

Fig
EF
13

Checking
Idle
Compemator

for
Op
ration

Note
Locate
stick

temperature
gauge

as
close
to
sensor
as

possible
so
that

warm
air

from

dryer
is

directed
to

these

parts
evenly