automatic transmission DATSUN PICK-UP 1977 Service Manual

r
General

Information

Differential

Pay
load

Destination
Class
Model

Engine
Transmission
carrier

model

kg
lb

and

gear
ratio

Standard
HL620TUN
F4W71B

wheelbase

HL620KTUN

3N71B

0

HLG620TUN

F4W7IB

Long
E

wheelbase
2

I
HLG620KTUN
Hl90

Canada

L20B

3N71B
500
1
100

4
375

I
KHL620TUN

F4W71B

0

Deluxe
Z

I
KHL620FTUN

Cab
FS5W7IB

I
KHL620KTUN

3N7J
B

Model
identification

KHLG620KTUV

I
I

L
U

V

N

T

K

F

0

G

o

H

K
I

Note

0
means
no
identification
Destined
for
U
s
A
and
Canada

California
model

Canada
model

Floor
shift
vehicle

Automatic
transmission

5

speed
manual
transmission

4

speed
manual

transmission

Long
wheelbase

Standard
wheelbase
and
Deluxe
Cab

Equipped
with
L20B

engine

Deluxe
Cab

GI
4

Fig
GI
9
Manual
trammiuion
number

location

Automatic

transmission

number

The
transmission

serial
number
is

attached
to
the

right
hand
side
of

transmission

case

Numbering
system

X
XXXXX

I

Serial
number

monthly

Month
of

manufacture

I
2

9
X
Y
Z

last

figure
of

year
of

manufacture

AT344

Fig
01
10
Automatic
trammi

sion

number
location

LIFTING
POINTS

AND
TOWING

LIFTING

POINTS

Screw

jack

Before

using
the

jack
proceed
a

follows
Generallnforml
ition

Apply

parking
brake

firmly
and

block
rear
wheels
if
the
front

of
the

vehicle
is
to

be
raised

Notes

a
Never

get
under
the
vehicle

while
it

is

supported
only
by
the

jack

Always
use

safety
stands
to

support

frame

or
rear
axle

case
when

you

have

to

get
beneath
the
vehicle

b
In
no
event
should
the

jack
be

applied
to

any
points

except
the

following
specified
portions

When

jacking
up
the
front
side

place
a
screw

jack
under
side
frame

about
520
nun

20
5
in
at
rear

of

front
axle
center

WT012

Fig
GI
ll
Front

lifting
point

When

jacking
up
the

rear
side

place

a
screw

jack
under
rear
axle
case
close

to
the
side

of
rear

spring

WH077

Fig
GI
12
Reor

lifting

point

Notes

a
When

the

yellow
mark

appean
on

the
screw

jack
it
indicates
the

maximum

permissible
height
Do

not

jack
up
further

b

When
the

jack
is
at
lower
llinit
do

not

add

large
force
downward

GI
6
YeDow
mark

WHOSO

Fig
GI

13

Warning

ogai
t

over
stroke

Garage

Jack

Note
When

carrying
out

operntions

with
a

garage

jack
be
sure
to

support
the
vehicle
withstands
in

a
safe
manner

When

jacking
up
the
front
end

apply
garage
jack
to
front
cross

member
or
center

portion
of
sus

pension
member

When

jacking
up
the
rear
end

apply
the

jack
to
rear
axle
case

r
J

uc

I

GI075
n9

Fig
GI

14
Front

lifting
point

GI076

Fig
GI
15
Rear

lifting

point

SUPPORTABLE
POINTS

The
front

supportable
points
are

under
frame

side
member

The
rear

supportable
points
are

under
rear

axle
case

Fig
GI

16
Front

supportable
points

v

GI078

Fig
GI
17
Rear

supportable
points

TOWING

When
the
vehicle
is
to
be

towed

forward
connect

a

rope
securely
to

the
hook
under
the
1st

CrosSIn
ember

Before

towing
make
sure
the

parking

brake
is

released
General
Information

To
tow
another
car
connect
t1ie

rope
to
rear
leaf

spring
shackle

Notes

a
A

towing
rope
should
not
be
con

nected
to

any
position
other
than

as
described
above

b
Avoid

applying
load

suddenly
to
a

towing
rope
as
it

may
cause
dam

age

WH131

Fig
Gl
18

Fronttowing
point

Fig
01
19
Rear
towing
point

GI
7
Manual
transmission

Before

towing
make
sure

the
trans

mission
is
in
neutral

gear

If
the
rear
axle
or
transmission
is

inoperative
the
vehicle
should
be

towed
with
its

rear
wheels
off
the

ground
or
the

propeller
shaft
must
be

re
l1oved

Automatic
transmission

When
the
vehicle
is
towed
on
its

rear
wheels
make
sure
the
trans

mission
is
in
N

Neutral
position

Don
t
exceed
30
km
h
20

MPH
and
a

distance
of
Hi
kin

6
miles
If
the
rear

axle
or
transmission
is

inoperative
or

if
the

speed
exceed
the
above
condi

tions

the
vehicle
must
be
towed
with

its

rear
wheels
off
the

ground
or
the

propeller
shaft
must
be
removed

Note
When
the
vehicle
is
towed
with

its
front
wheels
on
the

ground
the

steering
wheel
shouId
be
secured

to

maintain
a

straight
ahead

position

TIE
DOWN

The
front
two
tie

down
hooks

are

located
under

the
1st
crosSInember

The
hook
is

available
as
a

towing

hook
For
rear
tie
down
the
rear
leaf

spring
shackle
be
used
lIDs

point
is

also
used
as
a

towing
point

General
Information

APPROXIMATE
REFILL
CAPACITIES

I
Uter
u
s

measure

Imper
measure

Fuel
tank

I
45
J
IUi

gal
9

Ji

gal

Cooling
system
ManUal
transmission

I
8

0J

I
8Jiqt
7

qt

with
heater

Automatic
tr
smission

I
7

8J

I
8Y

qt

6Jiqt

Engine
lubrication
with
oil

f1lter

I
4

3J

I
4
Ji

qt
3

qt

system

without
oil
f1lter

I
3

8J

I
3Xqt
4

ql

I
4

speed
transmission

I
1

7J

I
3X

pl
3

pI

Manual
transmission

I
5

speed
transmission

I
2
0

I
4Y

pt
3Mpt

Automatic
transmission

I
5
s
J

I
5Uqt
4Uqt

Steering

gear
box

I
0
33J

I
pt
pt

Differential

carrier

I
1
0
J

I
2M

pI
I

pt

RECOMMENDED
FUEL

Use

an
unleaded
or
low
lead

gasoline
with
a
minimum
octane

rating
of
91

RON
Research

Octane

Nuniber
For
California

models
use
only
unleaded

gasoline
to

protect
the

catalytic
converter
from
contamina

tion

RECOMMENDED

LUBRICANTS

RECOMMENDED
SAE

VISCOSITY

NUMBER

C

ENGINE

on

12O
II
O
10Vt4ll
10Wf
2

I
ICWI
I

ao
40

J

SAE
5W
20
oils

ate
not
lecom

mended
for
sustained

high
speed

drivin

GEAR
On

I

J

w

c

30
20
0

20
40
60
80
100

Temperature
Range

Anticipated
Before

Next
Oil

Change
OF

GI
8

General
Information

LUBRICANT
SPECIFICATIONS

Item

Specifications
Remarks

SAE
Classification
Furthermore
refer
to

Gasoline

engine
oil

SD

or
SE
SAE
recommended

viscosity

table
See

Poge
GI
B

Transmission

and
API
GL
4

0

steering

Differential
API
GL
S

Automatic

TIM
fluid

Type
DEXRON

Multipurpose

grea
NLGI2
lithium

soap
base

Brake
and
clutch
fluid
DOT

3

Permanent
anti

freeze

Antifreeze

Ethylene
glycol
ba
e

GI
9

p

r

ET002

Fig
E1
11

Checking
specific
gravity

of
bottery
electrolyre

Clean

top
of

battery
and
terminals

with
a
solution
of
bakin

soda
and

Pennissible

value

Frigid
climates
Over
1

22

Tropical
climates

lOver
1
18

Other
climates

lOver
1
20

CHECKING
AND

ADJUSTING

IGN

ITIONTIM
iNG

AD
IUSTING
IGNITION

TIMING

I
Check

spark
plugs
and
distributor

breaker

points
for
condition

2

Thoroughly
remove
dirt
and
dust

from

timing
mark
on
crank

pulley
and

timing
indicator
on
front
cover

3
Warin

up
engine
sufficiently

4
Imtalla
timing
light
on
No
I

cylinder
spark
plug
wire
and
install
a

tachometer

5
Set

idling
spero
toapproxintate
y

750

rpm

6
Check

ignition
timing
with
a

timing
light
if
it
is

specified
value

If

necessary

adjust
it

as
follows

1
Loosen
setscrew
until
distribu

tor

can
be
moved

by
hand

2

Adjust
ignition

timing
to

speci

fied
value

3
0
Lock
distributor
setscrew

ai1d

make

sure
that

timing
is
correc
Engine
Tune

up

water

Rinse
off
and

dry
with
com

pressed
air

Top
of

battery
must
be

clean
to

prevent
current

leakage
be

tween
terminals
and
from

positive

terminal

to
hold
down

clamp

In
addition
to
current

leakage
pro

longed
accumulation
of
acid

and
dirt

o
n

top
If
l

l
ry
may

ca
u
iCbli
t

rj
I
g

of
the
material

covering
connector

straps
and
corrosion
of

straps
After

tightening
terminals
coat
them
with

petrolatum
vaseline
to

protect
them

from
corrosion

Full

charge

value

at
200C
680F

1
28

1
23

1
26

oo

I

ET169

Fig
ET

13

Checking
ignition
timing

Ignition

timing

Manual
transmission

120
750

rpm

Non
California
models

100
750

rpIll

California
models

Automatic
transmission

120

650

rpin

in

0

position

ET
10
CHECKING

ANb

REPLACING

SPARK

PLUG

I

Remove

and
clean

plugs
in

a
sand

blast
cleaner

2

Inspect
insulator
for
cracks
or

chips

3

Check
both
center
and

ground

electrodes

If

they
are

excessively
worn
re

place
with
new

spark

plugs

4

Spark
plug
gap

Breaker

points

type

0

8
to
0
9

mm

0
031
to
0
035
in

Transistor

ignition

type

1
0

to
1
1

mm

0
039
to
0
043
in

Tightening

torq

1
5
to
2
0

kg
m

11
to
A4
ft
lb

Fig
ET
14

Checking

spark
plug
point

gap

CHECK
I
G

DISTRIBUTOR

OPERATING

PARTS

AND

1

lrI9N

WIRING

BREAKER

POINTS

Non

California
models

Check
the
distributor
breaker

points
for
abnonnal

pitting
and
wear

Replace
if

necessary
Make
sure

they

are

properly

aligned
and
that

point

dwell

and

gap
are
correct
Clean
and

apply
distributor

grease
to
the
carn

lobes

Note
00

not

apply
grease
excessively

Point

gap

0

45
to
0
55
mm

Om8
to
0
022

in

Owell

angle

49
to
55

degrees

EE322

Fig
ET
15
Checking
diltribu
tor

point

gap

AIR
GAP

California
models

For

inspection
procedures
and

reference
data
refer

to
the

topic
Air

Gap
in

Section
EE

page
EE
29

DISTRIBUTOR

Check

centrifugal
advance
unit
for

loose
connection
or

improper
opera

tion
If
it
is
not

operating
properly

the

problem
may
be

due
to
a

sticky

spring
or
excessively
worn

parts
This

operation
needs
a
distributor
tester

For

inspection
procedures
and

ref

erence
data
refer
to

relative

topic

under
Distributor
in

Section
EE

If
vacuum
advance
mechanism
does

not

properly
operate
check
for
the

following
items
and

correct
the

prob

lem

as

required

1
Check
vacuum
inlet
for

signs
of

leakage
at
connection
If

necessary

retighten
or

replace

2

Check
vacuum
diaphragm
for
air

leak

If

necessary
replace
diaphragm

3

Inspect
breaker

plate
for
smooth

movement

If

plate
does
not
move
smoothly

this
condition
could
be
due

to

sticky

steel
balls
If

necessary
replace
break

er
plate
assembly

IGNITION
WIRING

Use

an
ohmmeter
to
check
resist

ance
of

secondary
cables
Disconnect

cables
from

spark

plugs
and
install
a

proper
adapter
between
cable
and

spark
plug
Remove

distributor
cap

and
secondary
cables
as
an

assembly

Do
not
remove
cables
from

cap

Check
resistance
of
one
cable
at
a

time

Connect
ohmmeter
between

spark

plug
adapter
and

corresponding
elec

trade
inside
cap
If
resistance
is
more

than
30
000
ohms
remove
cable
from
Engine
Tune

up

cap
and
check
cable
resistance

only
If

resistance
is
still
more
than

30
000

ohms

replace
cable

assembly

EF125

Checking
high
tension

cable

CHECKING

DISTRIBUTOR
CAP

ROTOR
AND

CONDENSER

Note
This

operation
is

to
be

per

formed
while

checking
distributor

points
Inspect
distributor

cap
for

cracks
and

flashover

External
surfaces
of
all

parts
of

secondary
system
must
be
cleaned
to

reduce

possibility
of

voltage
loss
All

wires
should
be
removed
from
distrib

utor

cap
and
coil
so
that
terminals

can

be

inspected
and
cleaned
Burned
or

corroded
terminals
indicate
that
wires

are
not

fully
seated
which

causes

arcing
between
end
of
wire
and
ter

minal
When

replacing
wires
in

ter

minai
be

sure
they
are

fully
seated

before

pushing
rubber

nipple
down

over
tower
Check
distributor
rotor
for

damage
and
distributor
cap
for

cracks

CONDENSER

I
Clean

outlet
of
condenser
lead

wire

and
check
for

loose
setscrew

Retighten
if

necessary

2
Check

condenser
with
a
con

denser
tester

Condenser

capacity

0
20
to
0
24

IF

Micro
Farad

Condenser
insulation
resistance

5Mn

Mega
ohms

ADJUSTING

CARBURETOR
IDLE

RPM
AND
MIXTURE

RATIO

Cautions

a
On
automatic
transmission

equip

T
11
ped
models
check
should
be

per

fonned
in

the
D

position

Be
sure

to

engage
parking
brake
and

to
lock
both
front
and
rear

wheels

with
wheel
chocks

b

Keep
your
foot
down
on
the
brake

pedal
while

depressing
the
accelera

tor

pedal
Otherwise
vehicle

surges

forward

dangerously

Notes

a
Do
not

attempt
to
screw
the
idle

adjusting
sc
ew
down

completely

Doing
so
could
cause

damage
to

tip

which
in

turn
will
tend
to
cause

malfunctions

b

If
idle
limiter

cap
obstructs

proper

adjustment
remove
it

To
install
idle
limiter

cap
refer
to

Idle
Limiter

Cap

c

After
idle

adjustment
has

been

made
shift
the
lever
to
the
N
or

P

position
for
automatic
trans

mission

d
When

measuring
CO

percentage
in

sert

probe
into

tail

pipe
more
than

40
em
15
7
in

CO
idle

adjustment
with

CD
meter

Idle
mixture

adjustment
requires

the
use
of
a

CO
meter

especially
for

California
models
When

preparing
to

adjust
idle
mixture
it
is

essential
to

have
the
meter

thoroughly
warmed

up

and
calibrated

I
Check
carburetor

pipes
for

proper

connection

2

Warm

up
engine
until
water
tem

perature
indicator

points
to
the
middle

of

gauge
The

procedure
to
warm

up

engine
is
not

specifically
recom

mended
Either

driving
vehicle
or

oper

ating
engine
at

no
load
will
be

good

3
Make

sure
that
water
tempera

ture
indicator

points
to

the
middle

Further

keep
engine
running
at
about

2

000

rpm
for
about
5
minutes
with

out

applying
load
to

engine
in

order
to

stabilize

engine
condition
Engine

hood
should
be

open

4
Run

engine
for

about
10
minutes

at
idling
speed
During
this
10

minutes

proceeq
as
described
i

steps

5

to
9
below

5
Remove
air
hose
between
3

way

connector
5

way
connector
for
Cali

fornia
models
and
air

check
valve
as

shown
in

Figure
ET
17

Plug
the

dis

r

connected

hose

to

prevent
dust

from

entering

To

air
check

valve

Fig
ET
17
Disconnect
air
hose

from
ojr
check
valve

6

Race

engine
1
500
to
2
000

rpm

two
or
three
times
under
no

load
then

run

engine
for
one
minute

at

idling

speed

7

Adjust
throttle

adjusting
screw

until

engine
is
at

specified
speed

Engine
speed

Manual
transmission

750

rpm

Automatic
transmission

in
D

position

650

rpm

8
Check

ignition

timing
If

neces

sary

adjust
it
to

specifications

This

operation
need
not
be
carried

out

at
1
600

Ian

1
000

miles
service

Ignition
timing

Manual

transmission

120
750

rpm
Non

California

100
750

rpm
California

Automatic
transmission

in
D

position

120

650

rpm

9
At
about
10

minutes
after

engine

is

run
at

idling
speed

adjust
idle

adjusting
screw
so

that
CO

percentage

is
at

specified
level

CO

percentage

Manual

transmission

2
t
I
at

750

rpm

Automatic
transmission

in
D

position

2
t
I
at
650

rpm

10

Repeat

procedures
as
described

in

steps
6
7

and
9
above
so
that
CO

percentage
is
at

specified
level
Check

ing
idle
CO
in

step
9
can
be
carried
out

right
after

step
7

11

Race

engine
I
500
to
2
000

rpm
two

or
three
times

under
no
load

and
make
sure
that

specified
CO

per

centage
is
obtained
Engine
Tune

up

12
Connect
air

hose
to
air
check

valve

If

engine
speed
increases

readjust
it

to
the

specified
speed
with

throttle

adjusting
screw

CO
Idle

adjustment
without

CO
meter

If
CO
meter
is
not

available
the

following
procedures

may
be
used

I

Check
carburetor

pipes
for

proper

connection

2
Wann

up
engine
until
water

tern

perature
indicator

points
to
the
middle

of

gauge
The

procedure
to

warm

up

engine
is

not

specifically
recom

mended
Either

driving
vehicle

or

oper

ating
engine
at
no
load
will
be

good

3

Make
sure
that
water

temperature

indicator

points
to
the
middle
Further

keep

engine

running
at
about

2
000

rpm
for

about
5
minutes

without

applying
load
to

engine
in
order
to

stabilize

engine
condition

Engine

hood
should

be

open

4

Run

engine
for
about

10
minutes

at

idling
peed

During
this
10

minutes

proceed
as
described
in

steps

5

to
9
below

5

Remove
air
hose
between
3

way

connector
5

way
connector
for
Cali

fornia

modeis
and
air

check
valve

shown
in

Figure
ET
17

Plug
the

dis

connected
hose

to

prevent
dust
from

entering

6
Race

engine
1

500
to
2

000

rpm

two
or
three

times
under

no
load
then

run

engine
for

one
minute

at

idling

speed

7

Adjust
throttle

adjusting
screw
so

that

engine
speeds
are
as
indicated

below

Engine
speed

Manual
transmission

815

rpm

Automatic
transmission

in
D

position

670

rpm

8
Check

ignition
timing
if
neces

sary
adjust
it

to
the

value

required
by

specifications
This

operation
need

not

be
carried
out
at
1

600
Ian

1
000

miles
service

9
At
about

10
minutes
after

engine

is
run
at

idling
speed
adjust
idle

adjusting
screw
until
maximum

rpm
is

obtained

ET
12
10

Repeat
procedures
as
described

in

steps
6
7
and

9
above

until

engine

speed
at
best
idle
mixture
is

815

rpm

for
manual
transmission

models
and

670

rpm
for
automatic

transmission

models
in
D

position

Adjustment

in

step
9

can
be

carried
out

right
after

step
7

II

Turn
the
idle

adjusting
screw

clockwise
until

engine
speed
drops
off

below

specified
rpm

Engine

speed
drops
off

Manual
transmission

60
to
70

rpm

Automatic
transmission

in
D

position

15
to
25

rpm

12
Connect
air
hose

to
air
check

valve

If

engine
speed
increases

readjust
it

to
the

specified
speed
with

throttle

adjusting
screw

IDLE
LIMITER
CAP

Do
not
remove
this
idle

limiter

cap

unless

necessary
If
this
unit

is

removed
it
is

necessary
to

readjust
it

at
the
time
of

installation
To

adjust

proceed
as
follows

1

After

adjusting
throttle
or

idle

speed
adjusting
screws
check
to
be

Sure

that
the
amount
of

CO
con

tained
in

exhaust

gases
meets
the

established
standard

2

Install
idle
limiter

cap
in

position

making
sure
that
the

adjusting
screw

further
turn
1

8
rotation
in
the

CO
RICH
direction

Carburetor

stopper

3lSo
ldle

limiter

cap

T

ET031

Fig
ET
18

Setting
idle
limiter

cap

CHECKING

CARBURETOR

RETURN

SPRING

Check
throttle

return

spring
for

cracks

squarene
s
or

defonnation

if

necessary

replace
with
a
new
one

CHECKING
CHOKE

MECHANISM
Choke

plate
and

linkage

1
Check
choke

valve
and
mech

anism

for
free

operation
and
clean
or

replace
if

necessary
A
binding
can

result
from

petroleum

gum
formation

on
choke
shaft

or
from

damage

2

Check
bimetal
cover

setting

Index
mark

on
bimetal

cover
is

usually

set

at
center
of
scale

Note

Always
align
the
index

mark
on

bimetal
cover
with
the
center
index

mark
on
choke

housing

3

Every
day
before

starting
engine

depress
the
accelerator

P
dal
to
see
if

choke
valve
is
closed

automatically

If
it
fails
to
be
closed
the

chances

are
that
link
movement
is
unsmooth
Engine
Tune

up

or
that
bimetal
is

out
of
order
Refer

to
Carburetor
in
Section
EF

CHECKING
FUEL

LINES
Hoses

pipings
connections

etc

Check
fuel
lines
for

loose
con

nections

cracks
and

deterioration

Retighten
loose
connections

and
re

place
any
damaged
or
deformed

parts

REPLACING
FUEL

FILTER

Check
for
a

contaminated
filter
and

water

deposit
All

engines
use
a

replaceable

cartridge
type
fuel
filter
as
an
as

sembly

@

Fig
ET

19
Fuel

filler
ET011

EMISSION
CONTROL
SYSTEM

CHECKING
CRANKCASE
EMISSION

CONTROL
SYSTEM

REPLACING
P
C
V
VALVE
AND

FILTER

CHECKING
VENTILATION
HOSE

CHECKING
EXHAUST
MANIFOLD
HEAT

CONTROL
VALVE

CHECKING
SPARK
TIMING

CONTROL

SYSTEM

SPARK
DELAY
VALVE

Automatic
transmission
models

only

INSPECTION

CHECKING

AUTOMATIC
TEMPERATURE

CONTROL
AIR

CLEANER

OPERATING
PRESSURE
OF

BOOST

CONTROLLED
DECELERATION
DEVICE

B
CD
D
I
ADJUSTMENT

CHECKING
B
C
DD
CIRCUIT

WITH

FUNCTION
TEST

CONNECTOR

CHECKING

CRANKCASE

EMISSION

CONTROL

SYSTEM

REPLACING
P
C
V
VALVE

AND
FILTER

Check
P

C
V

valve
in

accordance
CONTENTS

ET
13

ET
13

ET
14

ET
14

ET
14

ET
14

ET
15

ET
15

ET
17

ET
17
ADJUSTMENT
OF
SET
PRESSURE
OF

BOOST

CONTROLLED
DECELERATION

DEVICE
B

CD
D

CHECKING
B
C
D
D
SOLENOID
VALVE

CHECKING
AMPLIFIER
Manual

transmission
models

REPLACING
AIR
PUMP
AIR
CLEANER

ELEMENT

CHECKING
EXHAUST
GAS
RECIRCULA

TION
E
G
R
CONTROL
SYSTEM

CHECKING
EVAPORATIVE
EMISSION

CONTROL

SYSTEM

CHECKING
CATALYTIC
CONVERTER

INSPECTION

CHECKING
FLOOR
TEMPERATURE

WARNING
SYSTEM

INSPECTION

with
the

following
method

With

engine
running
at

idle
remove

ventilator
ose
from
P
C
V

valve
If

the
valve

is

properly
working
a

hissing

ET
13
ET
18

ET
20

ET
20

ET
20

ET
20

ET
22

ET

23

ET
23

ET

23

ET
23

noise
will
be

heard
as
air

passes

through
the

valve
and
a

strong
vacuum

should
be
felt

immediately
when

a

finger
is

placed
over
valve
inlet

Fresh
air

Blow

by
gas

CHECKING

VENTILATION

HOSE

1

Check
hoses
and
hose
connec

tions
for
leaks

2
Disconnect
all
hoses
and
blow

them
out
with

compressed
air

If

any
hose

cannot
be
free
of

obstructions

replace

Ensure
that
flame

arrester
is

surely

inserted
in
the

hose
between
air

cleaner
and
rocker
cover

CHECKING
EXHAUST

MANIFOLD
HEAT

CONTROL
VALVE

Run

engine
and

visually
check

counterweight
to
see

if
it

operates

properly

I
For

some
time

after

starting

engine
in
cold

weather

counterweight

turns

counterclockwise
until

it
comes

into

contact
with

stopper

pin
installed

to

exhaust
manifold

Counterweight

gradually
moves

down

clockwise

as

engine
warms

up

and
ambient

temperature
goes
higher

around
exhaust
manifold

2

When

engine
speed
is

increased

discharge
pressure
of
exhaust

gases

causes

counterweight
to
move
down

ward

clockwise
Engine
Tune

up

CoOl
1

Oil
level

gauge

2

8affle

pia
te

3

Flame
arrester

4

Filter

5
P
C
V
valve

6

Steel
net

7

Baffle

plate

1fiI

o

EC716

Fig
ET
20
Crankcaae
emi
ion

control8
tem

3
When
heat

control
valve
is
in
the

full

open

position
counterweight

moves
further

clockwise

exceeding
the

position
described

in
1

1
above
and

stops

again
coming
into

contact
with

stopper

pin

ct

t

C

EC245

1

Counterwe
ht

2

Stopper
pin

3

Heat
control

valve

Fig
ET
21
Cold

operation
of
counte

weigh
t

EC246

1

Counterweight

2

Stopper
pin

3
Heat
control
valve

Fig
ET

22
Hot

operation
of
counter

weight

ET

14
2
With

engine

stopped
visually

check

E
F
E

system
for
the

following

items

I
Thermostat

spring
for
dismount

ing

2

Stopper

pin
for

bend
and
count

er

weight
stop
position
for

dislocation

3

Check
heat
control

valve
for

malfunction

due
to
break
of

key
that

locates

counterweight
to
valve

shaft

4

Check
axial
clearance

between

heat
control

valve
and
exhaust
mani

fold
Correct
clearance
is
0
7
to
1
5

mm
0
028
to

0
059
in

5

Check
welded

portion
of

heat

control

valve
and

valve
shaft
for

any

indication
of
crack

or

flaking

6
Rotate
heat

control
valve

shaft

with
a

fmger
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

CHECKING
SPARK

TIMING
CONTROL

SYSTEM

This

system
is

installed
on
non

California
automatic
transmission

models

SPARK
DELAY
VALVE

Automatic
transmission

models

only

This
valve

delays
vacuum

spark

advance

during
rapid
acceleration
it

also
cuts

off
the

vacuwn

spark
advance

imme

iately
upon
deceleration

The

valve
is

designed
for
one

way
opera

tion

and
consists

of
a
one

way
umbrel

la
valve
and
sintered
steel
fluidic

restrictor