1977 DATSUN PICK-UP radiator

IDENTIFICATION

NUMBERS

The
unit
and
vehicle
numbers
are

stamped
and

registered
at
the

factory

The

engine
and
vehicle
identifica

tion

numbers

are
used
on

legal
docu

ments
These
numbers
are
used
for

factory
communications
such

as

Technical

Reports
Warranty
Claims

Service
Journals
and
other
informa

tion

Vehicle
IdentHication

plate

The
vehicle
identification

plate
is

located
at
the
hood

ledge
in
the

engine

compartment

SP029

Fig
GI
3
Vehicle

identification
plat

location

Vehicle
serial
number

The
vehicle
serial
number
is

stamp

ed
on
the

upper
face
of
the

right
side

member
The
number
is
identified

by

the

follQwing
flgUres
as
a
serial

number

HL620
XXXXXX

I

Serial
number

Vehicle
model

j

e

G1268

Vehicle

serial
number

location
Fig
GI
4
General
Informa
tion

Engine
serllii
number

The

engine
serial
number
is

stamped
on
the
right
hand
side
of
the

cylinder
block

L20B
XXXXXX

I

Serial
number

Engine
model

k

Color
code
number

The
color
code
number
label
is

stuck
on
the
radiator

support

GI326

Fig
01
6
Color
code
number
label

location

M
V
S
S
c
rtlflcatlon
label

The
M
V

S
S
certification
label
is

located
at
the
driver
side
lock

pillar

Gl
5
tW

I

1

I

il

j

SP031

Fig
GI
7
M
V
S
S

certification

label
location

Vehicle
emission
control

Information
label

The
vehicle
emission
control
infor

mation
label
is
stuck
on
the

insicre
of

the

hood

panel

SP076

Fig
GI
B
Vehicle
emia
ion
control

information
label
location

Manual
transmission
number

The
transmission
serial
number
is

stamped
on
the
front

upper
face
of

transmission
case

Number
system

x
X
XXXXX

I

Serial
number

monthly

Month
of

manufacture

2
9
X
Y
Z

Line
code
of

manufacture

Engine
Tune

up

BASIC
MECHANICAL
SYSTEM

ADJUSTING
INTAKE
AND
EXHAUST

VALVE
CLEARANCE

CHECKING
AND

ADJUSTING
DRIVE

BELT

RETIGHTENING
CYLINDER
HEAD
BOLTS

MANIFOLD
NUTS
AND
CARBURETOR

SECURING
NUTS

CHECKING
ENGINE
OIL

REPLACING
OIL
FILTER

CHANGING
ENGINE

COOLANT

ADJUSTING
INTAKE

AND

EXHAUST

VALVE
CLEARANCE

Note
After

tightening
cylinder
head

bolts

adjust
intake

and
exhaust

valve
clearances

Valve
clearance

adjustment
is

impossible
when
the

engine
is
in

oper

ation

1
Loosen

pivot
locking
nu
t
and

turn

pivot
screw
until
the

specified

clearance
is
obtained
while
cold

Using
service

tool

tighten
pivot

locking
nut

securely
after

adjustment

and
recheck
the
clearance

2
Warm

up
engine
for
at
least

several
minutes

and

stop
it
Measure

valve
clearance
while
hot
If
out
of

specifications
adjust

Unit
mm
in

Intake
0
20

0
008

Cold

Exhaust
0
25
0

010

Intake
0
25

OmO

Wann

I
Exhaust

0
30
0

012

STl
064000

I

ET009

Fig
ET

5

Adjusting
valve

clearance
CONTENTS

ET
7
PERMANENT
ANTI
FREEZE

COOLANT

CHECKING
COOLING
SYSTEM
HOSES

AND
CONNECTIONS

INSPECTION
OF

RADIATOR
CAP

COOLING
SYSTEM
PRESSURE
TEST

CHECKING
VACUUM

FITTINGS
HOSES

AND
CONNECTIONS

CHECKING
ENGINE
COMPRESSION

COMPRESSION
PRESSURE
TEST

TEST
RESULT
ET
7

ET7

ET
B

ET
B

ET
B

CHECKING
AND

ADJUSTING

DRIVE

BELT
ET

B

ET

B

ET
B

ET
B

ET

B

ET
9

ET
9

ET
9

2

Normal
drive
belt
deflection
is

8

to
12
mm

0
315
to
0
472

in
when

moderate
thumb

pressure
is

applied

midway
between

pulleys

1
Check
for

cracks
or

damage
Re

place
if

necessary

Compressor
pulley

8
to
12
mm
0
315
to
0
472
in

Idler

pulley

Water

pump
pulley

8
to
12
mm

0
315
to
0
472
in

Air

pump
pulley

Alternator

AC456

Fig
ET
6
Driue
belt
tension

RETIGHTENING

CYLINDER
HEAD

BOLTS
MANIFOLD

NUTS
AND

CARBURETOR

SECURING

NUTS
Tightening
torque

Cylinder
head
bolts

1st

turn

4

0

kg
m
29
ft
Ib

2nd
turn

6
0

kg
m

43
ft
Ib

3rd
turn

6
5
to

8
5

kg
m

47

to
61
ft
lb

Refer
to
the

following
tightening

torque
specifications

ET
7

r

ManifolJ
nuts

I

2
to
1
6

kg
m

8
7
to
I

6
ft
lb

Carburelor
nuls

0
5
to
1
0

kg
m

3
6
to
7
2
fl
tb

Fig
ET
7
Tightening
s

quence

CHECKING
ENGINE

OIL

Check
if
oil
is
diluled
with
water

or

gasoline
Drain
and
refill
oil
if

necessary

Notes

a
A

milky
oil
indicates
the

presence

of

cooling
water
Isolate
the
cause

and
take
corrective
measure

b
An
oil
with

extremely
low

viscosity

indicates
dilution
with

gasoline

2
Check
oil
level
If
below
the

specified
level

raise
it

up
10
the
H

level

Engine
oil

capacity

including
oil

filter

Maximum
H
leven

4
3
liters

4

MUS
qt
3
Y

Imp
qt

Minimum
L

level

3
3
liters

3
f
US

qt
2
U

Imp
ql

REPLACING
OIL

FILTER

The
oil
mter
is

a

cartridge
type
and

can
be
removed

using
Oil
Filter

Wrench
STI9320000

I
Check
for
oil
leaks

past
gasketed

flange
If

leakage
is

found

retighten

just
enough
to

stop
leakage
If

retight

ening
is

no

longer
effective

replace

mter
as
an

assembly
Engine
Tune

up

2
When

installing
oil

filter

tighlen

by
hand

Note
Do
not

overtighten
oil

flIt

lest

leakage
should
occur

CHANGING
ENGINE

COOLANT

PERMANENT
ANTI
FREEZE

COOLANT

Permanent
anti

freeze
coolant
is
an

ethylene
glycol
base

producl
conlain

ing
chemical
inhibilors
10

protect
the

cooling
system
against
corrosion

The
anti
freeze
does
not
contain

any

glycerine
ethyl
or
methyl
alcohol

It
will
not

evaporate
or
boil

away
and

can
be
used
with
either

high
or
low

temperaturethennoslat

It

flows

freely
transfers
heat
effi

ciently
and
will

not

clog
passages
in

the

cooling
system

The
anti
freeze
must
not
be
mixed

with
other

products

This
coolant
can
be
used

through

out

the
seasons
of
the

year

Whenever
coolant
is

changed
the

cooling

syslem
should
be
flushed
and

refilled
with
a

new
coolant

Check
the
level
See
the
instruc

lions
furnished

by
the
manufacturer

for
the
mixture
ratio

of
anti
freeze
10

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

kg
cm2
13

psi
1
to
radiator

cap
by

means
of

a

cap
tester
to
see
if
it
is

satisfactory
Replace
cap
assembly
if

necessary

ET
8
Fig
ET
fJ

Teltill
l
rod
ioto

cop

COOLNG
SYSTEM

PRESSURE
TEST

With
radiator

cap
removed

apply

reference

pressure
1

6

kg
cm2
23

psi
to
the

cooling
system
by
means

of
a
lesler
to
detect

any
leakage

Water

capacity

Without
heater

7
4
liters

7
U
US

qt
6
f

Imp
qt

With
heater

8
0
liters

8
f
US

qt
7

Imp
qt

CHECKING
VACUUM

FITTINGS
HOSES

AND
CONNECTIONS

Check
the
condition
of

filtings
and

hoses

Retighten
or

replace
if
neces

sary

All
vacuum
hoses
can
be
identified

by
colors

White
line

Vacuwn
tube
to
carburetor
E

G
R

Tube

Vacuum
tube
to
thermal
vacuum

valve

Thennal
vacuum
valve
to
E
G
R

control
valve

Engine
Tune

up

SERVICE
DATA
AND

SPECIFICATIONS

Ignition
timing
and

idling

Manual
transmission

Automatic
transmission

in
D

position

Valve

clearance

Cold
Intake

Exhaust

Intake

Exhaust
Hot

Belt
tension

Fan

Air

pump

Air

coo

compressor

Pressure

Compression
pressure
at
350

rpm

Standard

Minimum

Radiator

cap
relief

pressure

Cooling
system

Leakage
testing
pressure

Battery
specific

gravity
at
200C
680F

Distribu
tor

Point

gap

Air

gap

Dwell

angle

Condenser

capacity

Condenser
insulation

resistance

Spark
plug

Gap
degree
rpm
120
B
T
D

C
j750
Non
Calif

models

100

B
T
D

C
j750
California
models

degree
rpm
l20B

T
D

C
j650

mm
in

mm
in

mm
in

mm
in
0
20
0
008

0
25

0
010

0
25
0
010

0
30
0
012

mm
in

mm
in

mm
in

kg

lb
8
to
12
0
315
to
0
472

8to
12
0
315

to
0
472

8

to
12
0
315
to

0
472

10
22
is

applied

kg
cm2

psi

kg
em2

psi

kg
em
2

psi
12
0

171

9
0
128

0
9

13

kg
cm2

Psi
1
6
23

1

26

mm
in

mm
in

degree

IF

Mil
0
45
to
0
55
0

018
to
0
022

0
2
to
0
4
0

008
to
0
016

490
to
550

0
20
to
0
24

5

mm

in
0
8
to
0
9
0
031
to
0
035

Breaker

points
type

1

0
to
1
1
0
039

to
0
043

Transistor
ignition
type

Checking
CO

percent
at

idling
speed
No
air

Manual
transmission
model

rpm

Automatic
transmission
model

rpm

Adjustment
of

operating
pressure
of
B

C
D
D

B
C
D
D

set

pressure

Manual
transmission

Automatic

transmission
2
1

1
750

2
1
1
650

mmHg
in

Hg

mmHg
in
Hg
510
to
550
20
1

to
21
7

490
to
530
19
3
to
20
9

ET
25

Condition

ENGINE
POWER
NOT

UP
TO
NORMAL

Low
compression

Ignition
system
out
of

order

Fuel

system
out

of

order

Air
intake

system
out

of
order

Emission
control

Overheating

O

cooIing

Others
Engine
Tune

up

Probable
cause

Incorrect

iSnition
timing

Damaged

spark
plugs

Worn
distributor

points

Malfunction
of
choke

system

Clogged
fuel

pipe
or

floating
valve

Dirty
or

clogged
fuel
strainer

Fuel

pump
will
not
work

properly

C10ssed
carburetor

jets

Malfunction
of
altitude

compensator

CIOJBed
air
cleaner

Ail

inhaling
from
manifold

gasket
or

carburetor

gasket

Malfunction
of

E
G
R
valve

Stick
E
F
E

valve
shaft

Insufficient
coolant

Loose
fan
belt

Worn
or
oiled
fan
belt

Inoperative
thermostat

Worn
water

pump

Clogged
or

leaky
radiator

Worn
radiator
filler

cap

Ail

in

cooling
system

Improper
engine
oil

grade

Incorrect

ignition
timing

Clossed
carburetor
lean
mixture

Disconnected
altitude

compensator
hOlle

Inoperative
thermostat

Improper
octane
fuel

L

j
tire

pressure

Dragging
brake

Clutch

slipping

ET

30
Corrective
action

Previously
mentioned

Adjust

Clean

adjust
or

replace
plull

Dress

or

replace
points
Also
check

condenser

Adj
lst

Clean

Replace

Repair
or

replace

Disassemble
and
clean

Check
and

replace

Replace
element

Replace
gasket

Check
and
replace

Repair

Replenish

Adjust
fan
belt

Replace

Replace

Replace

Flush

repair
or

replace

Replace

Retighten
each

part
of

cooling
system

Replace
with

proper
grade
oil

Adjust

Overhaul
carburetor

Connect

Replace

Replace
with

specified
octane
fuel

Inflate

to

specified

pressure

Adjust

Adjust

Except
transistor

ignition
system

DESCRIPTION

COOLANT
LEVEL

DRAINING
AND
FLUSHING
THE

COOLING
SYSTEM

WATER
PUMP

REMOVAL
AND

INSTALLATION

DISASSEMBLY

INSPECTION
AND
ADJUSTMENT

TORQUE
COUPLING

REMOVAL
AND

INSTALLATION

DESCRIPTION

The

cooling
system
is
of
the
con

ventional

pressure
type
A

centrifugal

pump
installed
on

the

timing
chain

cover
serves
to
circulate
the

coolant

The

pressure
type
radiator
filler

cap

installed
on
the
radiator

operates
the

cooling
system
at

higher
than

atmos

pheric
pressure

The

higher

pressure
raises
the

boiling
point
of
the

coolant
and
in
Cooling
System

COOLING
SYSTEM

CONTENTS

CO
2

CO
2
OISASSEMBL
Y

INSPECTION

TEM
COUPLlNG

INSPECTION

THERMOSTAT

REMOVAL
AND

INSTALLATION

INSPECTION

RADIATOR

REMOVAL
AND

INSTALLATION

INSPECTION
CO
2

CO
2

CO
3

CO
3

CO
3

CO
3

CO
4

creases
the

cooling
efficiency
of

the

radiator

When
the

thermostat
is
closed

the

coolant
remains
in
the

cylinder
head

and

block
for
swift

warming
up
of
the

engine
After
it
reaches

normal

oper

ating

temperature
the

coolant
circu

lates

through
the
radiator

The

cooling
fan

drive
is
of
a

coupling
type

COOLANT

LEVEL

The

coolant
level
should

be
check

ed

and
maintained
at
SO

mm
1
97
in

below

the

upper
face
of
filler

neck

when
the

engine
is
cold
C0055

Fig
CO

I
Cooling

ry
lem

Caution

To
avoid
serious

personal

injury
never
remove
I3diator

cap

quickly
when

engine
is
hot
Sudden

release
of

cooling

system
pressure
is

very

dangerous

CO
2
CO
4

CO
4

CO
4

CO
5

CO
5

CO
5

CO
5

CO
5

CO
5

CO
6

If
it
is

necessary
to
remove
radiator

cap
wben
radiator
is
hot
turn

cap

slowly
counterclockwise

to
the
r

step
After
all

pressure
in
the
cool

ing
system
is
released
tom

cap

passing
the

stop
and
remove
it

DRAINING

AND
FLUSHING

THE

COOLING

SYSTEM

To
drain

the

cooling
system
re

move
radiator

cap
release
drain

cock

at
the
bottom

of
radiator
and
drain

plug
on

the

right
side
of

cylinder

block
If
the

heater

system
is
installed

set
heater

temperature
control
valve
to

open
position
After
the

coolant
is

drained

completely
close
drain

cock

and

plug
and
refill
the

system
with

clean
soft
water

WATER
PUMP

The

water

pump
cooling
fan

pulley

and

torque

coupling
are

a
unitized

construction

The
water

pump
is
of

a

centrifugal

type
which

is
mounted
on
the

engine

front
cover

The

pump
shaft
is

supported
by
a

double
row

of
ball

bearings

press
fit
in

an
aluminum
die
cast

pump
body
The

bearings
are

permanently
lubricated

and
sealed

to

prevent
loss
of
lubricant

and

entry
of

dirt

The

pump
is

provided
with
an

impeller
which
turns
on
a
steel

shaft

The

steel
shaft
rotates

together
with

the

torque

coupling
wheeL
The
volute

chamber
is
built
in
the

engine
front

cover

assembly

The
inlet
of
the

pump
is

connected

to

the
radiator
s
lower
tank

by
a
hose

i

o

CQ047

Fig
CO
2
Water

pump
and

engine

front
cover

REMOVAL
AND

INSTALLATION

Removal

in
to
a
clean

con

assembly

I

CQ048

Fig
CO
3
Removing
water

pump

Installation

1
Be

sure
to
clean
the

gasket
sur

faces
in
contact
with

pump
and
front

cover

Always
use
new

gaskets
when

installing

pump
assembly
Be
sure
to

tighten
bolts
Cooling
System

Tightening

torque

0
4
to
0
5

kg
m

3
0
to
3
6
ft
lb

2

Fill

cooling
system
and
check
for

leaks
at

pump

3

Install
fan
blade
and

tighten
at

taching
bolts

securely
Install
belt
and

adjust
for

specified
tension

4

Operate
the

engine
at
fast

idling

and
recheck
for
leaks

5
Install
fan
shrouds

Note
Ensure
that
clearance
between

shroud
and
Can
is

even
at

any

place

DISASSEMBLY

Water

pump
is

made
of
aluminum

and
its

bearing
outer
race
is
of
a

press

fit

type
For
this

reason
water

pump

should
not
be
disassembled

INSPECTION
AND

ADJUSTMENT

Inspection

Inspect
pump
assembly
for
the

fol

lowing
conditions
and

replace
if
nee

essary

1

Badly
rusted
or
corroded

body
as

sembly
and

vane

2

Excessive
end

play
or

roughness
of

bearings
in

operation

3
Reduced

cooling
efficiency
due
to

deteriorated
silicone
oil

4
Oil

leakage
in

torque
coupling
Adjustment

Fan

belt
should
be

properly
ad

justed
at
all
times
A

tight
belt
causes

wear
of

alternator
and
water

pump

bearings
A
loose
belt

brings
about

improper
cooling
fan
water

pump

and
alternator

operation

Check
the
belt
slack
between
alter

nator
and
fan

pulley
by
force
of
10

kg

22
lb

Slackness
of
fan
belt

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

Except
air

conditioner

equipped

models

The

torque
coupling
keeps
the
fan

speed
at
2
500

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

1

Torque
coupling
wheel

2

Torque
coupling
cover

3

Torque
coupling
bearing

4
Pulley

5
Water

pump

C0060

Fig
CO
4
Sectional
view
of

torque
coupling
and
water

pump

00
3

REMOVAL
AND

INSTALLATION

To

replace
the

torque

coupling

follow
the

same

procedure
as
in
the

water

pump
The

torque
coupling
can

not
be

separated
from
the
water

pump
Cooling
System

DISASSEMBLY

The

torque
coupling
is

so

designed

that
it

can
not
be

disassembled
INSPECTION

Inspect

torque
coupling
for
oil

leakage
If

necessary

replace

TEM

COUPLl
G

For
air
conditioner

equipped
models

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
Tern

coupling
however

is

properly
changed

with
the

cooling
requirement

ON
denotes

that

cooling
is
re

quired
and
the
fan

operates
up
to

about

2
150

rpm
When

high

cooling
is

not

required

during
cold
season
with

the

engine
warmed

up
etc
the

oper
w

6
I

1
Bi
metal

thermostat

2

Slide
valve

3
Reserve
chamber

for
OFF

4

Bearing

5

Driving
chamber
for

ON

6

ouplingpart
labyrinth

coon

Fig
CO
5
CrQM
sectional
view

of
Tem
coupling

ation
is

placed
under

OFF
condition

and
the
fan

slips
at
about

1
650

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
silicon
oil
is
forwarded

to
the

groove
that
transmits

torque
and
the

CO
4
system
is

placed
under
ON

con

dition

When
the

valve
closes
silicone
oil
is

not

supplied
to
the

driving
chamber

oil
in

the

driving
chamber
is

accumu

lated
on

periphery
due
to
the

centrif

ugal
force
and
led

into
the
reserve

chamber
Now

oil
is

eliminated
from

the

driving
chamber

and
the

system
is

placed
under
OFF
condition

With
this

system
when
fan

cooling

is
not

required
the

output
loss
is

minimized

and
noise

can
be
far

reduced