coolant temperature DATSUN 210 1979 Service Manual

DATSUN
210
Model
8310
Series

SECTIONET

ET

ENGINE
TUNE
UP

CONTENTS

EMISSION
CONTROL
DEVICES

BASIC
MECHANICAL
SYSTEM

ADJUSTING
INTAKE
AND
EXHAUST

VALVE
CLEARANCE

CHECKING
AND
ADJUSTING
DRIVE

BELTS

CHANGING
ENGINE
OIL

REPLACING
01
L
FI
L
TER

CHANGING
ENGINE
COOLANT

CHECKING
COOLING
SYSTEM
HOSES

AND

CONNECTIONS

CHECKING
ENGINE
COMPRESSION

IGNITION
AND
FUEL

SYSTEM

CHECKING
BATTERY

CHECKING
AND
ADJUSTING

IGNITION
TIMING

CHECKING
IGNITION
WIRING

CHECKING
AND
REPLACING
SPARK

PLUGS

CHECKING
AND
ADJUSTING
CARBURETOR

IDLE
RPM
AND
MIXTURE
RATIO

CHECKING
CHOKE
MECHANISM

Choke

plate
and

linkage

CHECKING
FUEL
SHUT
OFF
SYSTEM

FU
models
ET
2

ET
3

ET
3

ET
3

ET
3

ET
3

ET
4

ET
4

ET
4

ET
5

ET
5

ET
5

ET
6

ET
6

ET
7

ET
9

ET
9
REPLACING
FUEL
FILTER
ET
10

CHECKING
FUEL
LINES

Hoses

piping
connections
etc
ET
10

REPLACING
AIR
CLEANER

FILTER
ETlO

CHECKING
AUTOMATIC
TEMPERATURE

CONTROL
AIR
CLEANER
ET
10

EMISSION
CONTROL

SYSTEM
ET
11

CHECKING
VACUUM
FITTING
HOSES

AND
CONNECTIONS
ET
11

REPLACING
AIR
PUMP
AIR
CLEANER
FILTER

Except
FU
models
and
Canada
models
E

1122i

REPLACING
AIR
INDUCTION
VALVE
FILTER

FU
models
and
Canada
models

E
tlil1r2
C

REPLACING
PCV
VALVE
AND
FILTER

ETf

CHECKING
VENTI
LATION
HOSES

E1P12

CHECKING
VAPOR
LINES

Eli
J2

CHECKING
FUEL
TANK
VACUUM
RELIEF
I

f
III

VALVE

ET
13

REPLACING
CARBON
CANISTER
W

FILTER
ET
d

SERVICE
DATA
AND

SPECIFICATIONS
ET
14

TROUBLE
DIAGNOSES
AND

CORRECTIONS
ET
16

SPECIAL
SERVICE
TOOL
ET
23

pl
ice
mter
as

an

assembly

2

When

installing
oil
mter

tighten

by
hand

Note
Do
not

overtighten
oil
filter

lest

leakage
shoUld
occur

CHANGING
ENGINE

COOLANT

PERMANENT

ANTI
FREEZE

COOLANT

Note

The

permanent
anti

freeze

coolant
is
an

ethylene
glya
l
base

product

containing
chemical
in

hibitors
to

protect
the

cooling

system
from

rusting
and
corrosion

The
anti

freeze
does
not
cOntain

any
glycerine
or

ethyl
alcohol
It

will
not

evaporate
or
boil
a

ay
and

can
be

ilsed
with
either

high
or
low

temperature
thermostats
It

flows

freely
transfers
heat

efficiently

and
will
not

clog
the

passages
in

the

cooling

system
The
anti
freeze

must
not
be
mixed

with
other

product
This
coolant
can
be
used

throughout
the
seasons
of
the

year

Whenever
coolant
is

changed
the

cooling

system
must
be
flushed
and

refilled
with
a
new
coolant
Check
the

coolant
level

See
instructions

attached
to

the

anti
freeze
container
for

mixing
ratio

of
anti
freeze

to
water

CHECKING
COOLING

SYSTEM
HOSES

AND
CONNECTIONS

Check
hoses
and

fittings
for
loose

connections

or
deterioration
Re

tighten
or

replace
if

necessary

INSPECTION
OF
RADIATOR

CAP

Apply
reference

pressure
0

9

kgj
cm2
13

psi
to

radiator

cap
by

means
of
a

cap
tester
to

see
if
it
is

satisfactory
Replace

cap
assembly
if

necessary
I

j
ngine
Tune

up

ET012

Fig
ET

3

Testing
Radiator

Cap

COOLING
SYSTEM

PRESSURE
TEST

Witli
radiator

cap
removed

apply

reference

pressure
1
6

kgfcm2
23

psi
to
the

cooling
system
by
means

0

no

Fig
ET
4

Water

capacity
M
Tmodelsl

Without
heater

5
2
liten

5
1f
US

qt
4

Imp
qt

With
heeter

5
9
Iiten

6
4
US

qt
5

Y

Imp
qt

Water

capacity
AfT
modelsl

Without
heater

5
0
liters

5

y
US

qt
4

Imp

qt

With
heater

5
7
liten

6
US

qt
5

Imp
ill

CHECKING
ENGINE

COMPRESSION

Note

a
To
check

cylinder

compression
it
is

essential

to
remove
all

spark
plugs

The

purpose
of
this
test
is
to

ET
4
determine
whether
there
is
exces

sive

leakage

past
piston
rings
head

gasket
etc
To
test

engine
should

be
heated
to
the

operating
t
M

ture
and
throttle
valve

opened

b

Cylinder
compre
on
in

Cylinders

should
not
be
less

than
llO
of
the

highest
reading
Different

compres

sion

in
two
ore
more

cYlinder
usual

ly
indicates
an

improperly
seated

valve
or
broken

piston
ring

c
Low

compression
in

cylinders
am

result
from
worn

piston

rings
This

trouble

may
usuaDy
be
accom

panied
by
ex
ssive
fuel

consump

tion

I

Warm

up
engine
sufficiently

2

Disconnect

aU

spark

plugs

3
Disconnect
anti
dieseling

solenoid

valve
connector

4

Properly
attach
a

compression

tester
to

spark

plug
hole
in

cylinder

being
tested

FiI
ET
S
ET529

Testing
Compre
sion

Pr
s8ure

5

Depress
accelenit6r

pedal
to

open

throttle
and
choke

valves

Note
Do
not

pump
pedal

6
Start

engine
as

quickly
as

pos

sible

Compression
pressllre

kg
cm2
ii
at

rpm

Standard
13

5
192

350

Minimum
12
5

1781
350

If

cylinder

compression
in
o
e

or

more
cylinders
is
low

pour
a

small

quantity
of

engine
oil
into

cylinders

through
the

spark

plug
holes
and
retest

compression

I

If

addingoil
helps
the

compres

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

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

INSPECTION

Entire

system

I

Make
a

thorough
vjsual
check
of

E

G
R

control

system
If

necessary

wipe
away
oil
to
facilitate

inspection

If

any
hoses

are
cracked
or

broken

replace

2

With

engine
stopped
inspect

E

G
R

control
valve
for

any
indication

of

binding
or

sticking
by

moving
dia

phragm
of
control
valve

upwards
with

a

finger

3
With

engine
running
inspect

E

G
R

control
valve
and
thermal
vacu

um
valve
for
normal

operation

1
When

engine
coolant

tempera

tun
is
low

Make
sure
that
E

G
R

control
valve

does

not

operate
when

engine
speed
is

increased
from

idling
to
3
000
to

3

500

rpm

Place
a

finger
on
the

diaphragm
of

E
G
R

control
valve
to
check
for
valve

operation

EC773

Fig
EC
73

Checking
E
G
R
Control

2

When

engine
coolant

tempera

tureishigh
Emission
Control

System

Make

sure
that
E
G

R
control
valve

operates
when

engine
speed
is
in

creased
from

idling
to
3
000
to
3
500

rpm
Place

fingers
on
the

diaphragm
of

E

G
R
control
valve
to
check
for
valve

operation

If
E
G

R
control
valve
does

not

operate
check
as
follows

Disconnect
one
end
E

G
R

control

valve
side

of
vacuum
hose
connect

ing
ihermal

vacuum
valve
to

E
G
R

control
valve

Increase

engine
speed
from

idling
to

3
000
to
3

500

rpm

Make
sure
that

thermal
vacuum

valve
is

open
2

port
type
or

closed
3

port
type
and

that
car

buretor
vacuum
is

present
at
the

end
E
G
R

control
valve
side
of

vacuum
hose

If

vacuum
is

weak
or

not

present
at

all

replace
thermal

vacuum
valve
If

vacuum
is

present
check
E
G
R

control
valve
or
B
P

T
valve

If

any
difficulty
is
encountered
in

judging
the
condition
of

any
com

ponent
during
above

inspection
check

the

questionable

component
in

dependently
as
follows

U

S
A

models

Ie

EC160A

Canada
models

ET429

Fig
EC
74

Checking
Vacuum

of

E
G
R
Control
Valve

EC
25
E
G
R
control
valve

Dismount
E
G

R
control
valve

from

engine

I

Apply
vacuum
to
E
G
R
control

valve

referring
to
the

following
figure

If
the
valve
moves
to
full

position
it
is

normal

E

G
R

control
valve
will
remain

open
for
more
than

30
seconds
after

vacuum
has
cut
off

5t
orr

rl

1

1

Fig
EC
75
EC129A

Checking
E
G
R
Control

Valve

2

Visually
check
E
G
R
control

wive
for

damage
wrinkle

or
deforma

tion

3

Clean
the

seating
surface
of

E
G
R
control
valve
with
a

brush
and

compressed
air
and

remove

foreign

matter
from
around
the
valve
and

port

Fig
EC

76

Cleoning
E
G
R
Control

Valve

Thermal
vacuum
valve

3

port
type

Remove
thermal
vacuum
valve
from

engine
Inhale
air

from

port
ofE
G
R

system
and
check
to
be
sure
that

thermal
vacuum
valve

opens
or
closes

in

response
to
its

temperature

Thermal

vacuum
valve

dosing

temperature

Above
50

to
630
C

122
to
1450
F

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

with
the

pin
hole
of
the
internal

rotor

combined
with
the
manual

shaft
and

check
their

alignment
by

inserting
a

1
5
mm
0
059
in
diameter

pin
into

the

holes
If
the

alignment
is

correct

fasten
the
switch

body
with
the
bolts

pull
out
the

pin
tighten
up
the
screw

in

the
hole
and
fasten

the
selector

lever
as
before
Check

the

continuity

pin
with
the
lesler
If

Ihe
malfunc

tion
still
remains

replace
the
inhibitor

switch

STALL
TEST

The

purpose
of
this
test
is
to
check

the
transmission
and

engine
for
trou

ble

by
measuring
the
maximum
num

bers
of
revoiutions
o
the

cngine
while

vehicle
is
held
in

a
stalled

condition

The
carburetor
is
in

fullthrollle

opera

tion
with
the
selector
lever
in

ranges

1
2
and
I

respectively
Com

pale
the
measured

results
with
the

standard

values

Components
to
be
tested
and

test
itelJUl

I

Clutches
brake
and
band
in
trans

mission
for

slipping

2

Torque
converter
for

proper
func

tioning

3

Engine
for
overall

properly

STAU

TEST
PROCEDURES

Before

testing
check
the

engine
oil

and

torque
converter

oil
warm

up
the

engine

cooling
w

ter
to

suitable
tem

perature
by

running
at
1
200

rpm
with

the

selector
lever
in
the

range
P

for

sevcral
minutes

Warm

up
the

torque

converter
oil

to
suitable

temperature

60
to
lOOoC

140
to
2120F

I

Mount
the

engine

tachometer
at
a

location
that

allows

good
visibility

from

the
driver

s
seat
and

put
a
mark

on

specified
revolutions

on
the

meter

2

Secure
the
front
and
rear
wheels

with
chocks

and

apply
the
hand

brake

Be
SIIre

to

depress
the
brake

pedal

firmly
with
the
left
foot
before
de

pressing
the

accelerator

pedal

3
Throw
the

selector
lever
into
the

range
11

4

Slowly

depress
the

accelerator

pedal
until
the

throttle
valvc
is

fully
Automatic

Transmission

opened
Quickly
read
and

record

the

engine
revolution

when
the

engine

begins
to
rotate

steadily
and
then

release
the
accelerator

pedal

5
Shift
the
selector
lever

to
N

and

operate
the

engine
at

approxi

mately
1
200
rpm
for
more
than
one

minute
to
cool

down
the

torque
con

verter
oil
and
coolant

6
Make
similar
staU
tests
in

ranges

2
I
and
R

CAUTION

The

dill
test

operstion
81

specified
in

i18m
4

should
be

I118de
within

fiv

lIeonds

If
it
tBkes
too

long
the

oil

If

and
the
cluti
hn
blllke

and
b
nd

elll

ly
I
Suf

ficient

cooling
time
should

be

given

r

eech
test
for
the
four

IlInges

0
Z
1
end
R

JUDGEMENT

High
stall
revolution

more
than

staitdard
revolution

If
the

engine
levolulion
in

stall

condi
ion
is

higher
than
the
standard

values
it
indicates

that
onc
or
more

clutches
in
the

transmission
are

slipping
and
therefore
no

further
test

is

required

For
the

following
abnormalities

the

respective
causes
are

presumed

High
rpm
in

all

ranges
low
line

pr
ssure

High
rpm
in
0

2
and
I

and

normal

rpm
in
6R

Rear
clutch

slipping

High
rpm
in
D

and
2
and

normal

rpm
in

One

way

clutch

slipping

High
Ipm
in
R

only
Front

clutch
or
low

and
reverse
brake

slipping

To

determine
which
is

slipping

front

clutch
or
low
and
reverse

brake

a
road

test
is

needed

If
while

coasting
after

starting

with
the
levcr
in
I

range
engine

braking
does
not

work

properly
the

low

and
reverse
brake
is

slipping

Otherwise
the
front
clutch
is

slipping

Slipping
of
the
band
brake
is
diffi

cuJt
to
ascertain

However
jf
it

occurs

with

the
lever
in
1

range
engine

AT
41
revolution
increases

up
to
the
same

level

as
in
1st

range
It

is

impossible

to

check
it
in
the

stall
test

2
Standard
stall
rnoluiion

If
the

engine
revoluiion
in

stall

ondition
is
within

he
standard

values
the
control
elements
are

nOf

mally

operating
in

the

ranges
D

2n
I

and
R

Also
the

engine
and
one

way

clutch
of
the

torque
converter
are

norinal
in

performance
and

operation

The

one

way
clutch

of
the

torque

converter

however
sometimes

sticks

This
is
determined

in
the
road

test

3

Lower

stall
revolution
than
lIand

ard

revolution

If

the

engine
revolution
in

stall

condition
is

lower
than
the

standard

values
it

indicates
that
the

engine
is
in

abnormal

condition
or
the

torque
con

verter
s
one

way
clutch
is

slipping

4
O
hers

I
If

the

accelerating
performance

is

poor
until
vehicle

speed
of

approxi

mately
SO

kmfh
30
MPH
is
attained

and
then
normal

beyond
that

speed
it

can
be

judged
that
the

torque
con

verte
c

s
one

way
clutch
is

slipping

2

If
the

torque
converter

sane

way
dutch
sticks

vehicle

speed
can

not

exceed

approximately
80

kmfh

SO
MPH
in
the

road
tesl

In
such

a

case
the

torque
converter

oil
tem

perature
rises

abnormally
and
so

special
care
is

required

3
If
the

transmission
does
not

op

erate

properly
at
all
vehicle

speeds
it

indicates

poor
engine
performance

ROAD

TEST

An

accurate

knowledge
of
the
au
to

matic

transmission
is

required
for
an

exact

diagnosis

II
is

recommended
that
a

diagnosis

guide
chart
with
the
standard

vehicle

speeds
for
each

stage
of

the

up
and

down

shiftings
be

prepared
Measured

vehicle

speeds
are
to

be
filled
in

the

adjoining
column
after
each

testing

Also
it

is
advisable
to

mount

a

stopper
for

positioning
the
throttle

opening