radiator cap DATSUN 610 1969 Workshop Manual

CoolIng
System

GENERAL

FAN
BELT
TENSION

FLUSHING
AND
DRAINING
THE
SYSTEM

THERMOSTAT

Testing

RADlA
TOR
Removal

GENERAL

The

cooling
system
is

pressurised
and

incorporates
a

water

pump
corrugated
fin

type
radiator
fan
and
a

pellet
type

thermostat

The
water

pump
is
of
the
centrifugal
type
and
has
an

aluminium
die
cast

body
The
volute
chamber
is
built
into

the

front
cover

assembly
and
a

high
pressure
sealing
mechanism

prevents
water

leakage
and
noise

The
fan

pulley
is
driven

by
the
V
belt
from
a

pulley
on

the
crankshaft

he

pellct
type
thermostat
enables
the

engine
to
warm

up

rapidlY
and
also

regulates
the

temperature
of
the
coolant
When

the
wax

pellet
in
the
thermostat
is
heated
it

expands
and
exerts

pressure
against
a
rubber

diaphragm
causing
the
valve
to

open

and
allow
the
coolant
to
flow
from
the

cylinder
head
back
to

the
radiator

As
the

pellet
is

cooled
itcontractsand
allows
the

spring
to

close
the
valve

thereby
preventing
coolant
from

leaving
the

cylinder
head

The
rad
ator
is
of
the
down

flow
type
with
an

expansion

tank
The
relIef
valve
in
the
radiator
filler

cap
controls
the

pressure
at

approximately
0
9

kg
sq
cm

l3Ib
sq
in
Always

try
to
avoid

removing
the
filler

cap
when
the

engine
is
hot
as

coolant

may
spray
out
and
cause

scalding

If
the

cap
must
be
removed
in
these
circumstances
use
a

lar
e

pic
c
of
cloth
to
hold
the

cap
and
turn

the
cap
sli

htlY

Walt
until
all

pressure
has

been
released
before

lifting
off
the

cap

F
AN
BELT
TENSION

The
fan
belt
drives
the
water

pump
and
alternator
as

well

as

the
fan
and
its
correct

adjustment
is
most

essential
A
loose

fan

belt
will

sl
ip
and

Y
e
r

and
most

probably
cause

overheating

alternatively
If
the
belt
IS
too

tight
the
pump
and
alternator

bearings
will
be
overloaded

The
belt
is

correctly
tensioned
if
it
can
be
depressed

by

approximately
10
mm

1
2
in
at
a

point
midway
between
the

fan
and
alternator
pulleys
See

Fig
R2

If

adjustment
is
neces

ary
slacken
the
alternator

mounting

and

adjustment
bolts
and

pivot
the
alternator

away
from
the

engine
to

tighten
the
belt
to

towards
the

engine
if

the
belt

is

to
be
slackened

NOTE

Always
apply
leverage
to
the
drive
end

housing
when

pivoting
the
alternator
and
never
to
the
diode
end

housing
or
the
alternator
will
be

damaged
Retighten
the
alternator
bolts
and
make
SUfe

that
the
belt

is

correctly
tensioned

FLUSHING
AND
DRAINING
THE
SYSTEM

The
radiator
and
water

passages
should
be
flushed
out

periodically
to
remove
the
accumulated
scale
or
sediment

Reverse

flushing
equipment
should
be
used
to

carry
out
a

completely
thorough
flushing
operation
but
the
owner
drivef

not

possessing
this

type
of

equipment
can
flush
out
the

system

in

the
following
manner

Drain
the
system
by
removing
the
radiator
filler

cap
and

opening
the
radiator
and

cylinder
block
drain

taps
Close
the

taps
again
and
refill
the
radiator
Run

the
engine
for
a
ShOft

period
and
then
rc
open

the
drain
taps
Continue
this

sequence

until
the
water

flowing
from
the

taps
is
clean
then
close
the

taps

and
refill
the
radiator

An
anti
freeze
mixture
should

always
be
used
in
Winter

time
The
Niss3n

long
life
coolant
L
L
c
is
an

ethylene
glycol

solution

containing
a
corrosion

preventative
which
can
remain

in
the
vehicle

throughout
the
year
but
must
not

be
mixed
with

other

products

It
is
advisable
to
check
the
radiator
and
heater
hoses
when

filling
with
anti
freeze
and
renew

them
if

signs
of
deterioration

are

apparent

WATER
PUMP

Replacement

The
water
pump
must
not
be
dismantled
and
should
be

renewed
if
it
becomes

faulty
The

pump
can
be
removed
in
the

following
manner

Drain
the

cooling
system

2
Take
the
fan
belt
off

the
pulley

3
Remove
the
fan
and

pulley

4
Remove

the
retaining
nuts
and
withdraw
the
water

pump

See

Fig
B
3

lnstallation
of

the

pump
is
a

reversal
of
the
removal

procedures

rERMOST
ATTesting

The
thermostat
is
located
in
the
water
outlet

passage

See

Fig
B
4
To
remove
the
unit
drain
the
cooling

system

remove
the
radiator
hose
and
the
water
outlet
elbow
Take
out

the
thermostat

25

The
thermostat
can
be

tested

by
suspending
it
with
a

thermometer
in
a

container
ftlled
with
water

Heat
the
water

gradually
and
stir
it
to

obtain
a
uniform

temperature
Maintain

a
constant

check
of
the

temperature
and

make
sure

that
neither
the
thermostat

or
thermometer

touch

the
sides
of
the
container
or
false

readings
will
be
obtained

The
thermostat
should

begin
to

open
at
a

temperature
of

820C

1
50C

179
60F
2

70Fj
and
should
be

fully

open

with
a
maximum
valve
lift
of
8
mm

0
315
in
at
a

temperature

of

950C
2030F

When

installing
the
thermostat

apply
adhesive
to

both
sides

of
the

gasket
before

refitting
the
water
outlet
elbow

RADIATOR
Removal

Drain

the

cooling

system
as

previously
described
and
remove

the
front

grille

2
Disconnect

the
radiator

upper
hose
lower

hose
and
hose
to

the
reservoir
tank

3
Remove
the

radiator

securing
bolts

and
lift
out
the

radiator

Fig
B
4
It
should
be
noted
that
cars
fitted

with
automatic
transmission

incorporate
a
transmission
oil
cooler

which
must

be
disconnected

Installation

is
a

reversal
of
the
removal

procedure
refill

the

system
as

previously
described

FLUID
COUPLING

The
water

pump
is

equipped
with

a
fluid

coupling
on

vehicles
fitted
with
an

air
conditioner

The
fluid

coupling

Limits

the
maximum
fan

speed
to

approximately
3000

r

p
ro

and
eliminates
noise

and
loss
of

power
at

high
engine

speeds

A
fault
in
the

coupling
may
be
caused

by
the

entry
of

foreign
matter

If
a
fault

developes
the

oupling
must
be

removed
and
dismantled

and
the
interior
cleaned

by

washing

in
solvent
The
condition
of
the
seal

and

bearing
must
be
care

fully
checked

and
the

coupling
replaced
if
the
latter

items
have

become
blackened
If
oil
leaks
occur

it
will
be

necessary
to

replace
the

water

pump
assembly
with
the

coupling
After

cleaning
the
unit
refill

with
11
5
cc
silicon
oil

using
a

suitable

syringe

TechnIcal

Data

Radiator

Radiator

cap
working
pressure

Radiator
core

heightxwidth

x

thickness

1400

and
1600
cc

engines
510

body

1600
and
1800
cc

engines
610

body
Corrugated
fin

type

0
9

kg

sq
cm

13Ib
sq
in

280x488x38mm

I
LOx
19
2x
1
49

in

360x502x32mm

l4
2x19

8x1
26
in

Thermostat

valve

opening

temperature

Standard

B20C
l
BOOF

Cold
climates
880C

1900F

Tropical
climates

76
50C
l700F

Max
valve
lift

Cooling
system

capacity

With

heater

Without
heater

Cooling
system

capacity

With

heater
Above
8
mm
0
31
in

6
8litres

1
75
US

gall

1
5

Imp
gall

6
4litres

1
75
US

gall

1
375

Imp
gall

1600

and
1800
cc

engines
610

body

6
5litres
l
7

US

gall

1
375

Imp
gall

6
0

Iitres
1
625
US

gall

1
375

Imp

gall
Without
heater

27