1979 DATSUN 210 engine

for
Leaks
Here
is

how
leaks

are

stopped

I

Check

torque
on

the
connection

fitting
and
if
too
loose

tighten
to
the

proper
lorque
Check
for

gas
leakage

with
a
leak
detector
Air

Conditioning

2
If

leakage
continues

ven
after

the

fitting
has
been

retightened
dis

charge
refrigerant
from

system
disc
on

net

the

fittings
and

check
its

seating

face

for

damage

Always
replace
even

if

damage
is

slight
J

Check

compressor
6il

and
add
oil

if

required

4

Charge

refrigerant
and
recheck

for

gas
leaks

If

no
leaks
are
found

evacuate

and

charge
system

SERVICE
PROCEDURES

FAST
IDLE

ACTUATOR

ADJUSTMENT
OF

IDLE
SPEED

Engine
model

Transmission
When

A
C
is
OFF
When
A
C
is
ON

F

LCD
is

actuated

Manual

700

rpm
800

rpm

A14
A15

Automatic
650

rpm
800

rpm

at
D

position
at
N

position

The
fast
idle

control
device
is
used

on

cars

equipped
with

an
air

condi

tioner
to
raise
the

idle

speed
auto

matically

Use
the

following
procedures
when

adjusting

1
Run

engine
until
it

reaches

oper

ating

temperature

2

With
air
conditioner
in

OFF

when

compressor
is
not

operated

make

sure
that

clearance
e
between

levers
A
and

8
is

more
than

J
mm

0
12
in

If
clearance
C
is

less
than

J

mm
0
12
in

loosen
cable
lock

screw
and

push
down

on
lever
A

so

that
clearance
C
is

more
than
J
mm

0
12
in

3
Make
sure

that

engine
is
at
cor

rect
idle

speed

4

With
air

conditioner
in

ON
when

F

LC
D
is
actuated

set

engine
speed

to
800

rpm
using

following
procedures

as
a

guide

I
Turn

adjusting
screw
until
en

gine
speed
is
800

rpm

On
cars

equipped
with
automatic

transmission

make
this

adjustment

with
shift
control
lever
in

N

posi

tion
2
If

engine
speed
cannot
be

adjust

ed

properly
with

adjusting
screw

check
and

adjust
clearance
e

again

3

Depress
and
release
accelerator

pedal
several
times
and
make

sure
that

engine

speed
reduces
to
800

rpm
as

pedal
is

released

If
correct

adjustment
is
not
made

repeat

steps
I
to
3
above
until

engine
speed
is

800

rpm
at

idling

1

FlCD

adjusting
screw

2
Lever
A

3
Lever
B

4

Cable
lo
k

screw
Clearance

e

AC381
A

Fig
AC
24
Fast
Idle
Actuotor

AC
18
REMOVAL
AND

INSTALLATION

Remove

vacuum
hose
from
actua

tor

2

Remove
air

cleaner

assembly

3

Remove
cotter

pin
and

pin
and

disconnect

actuator
from
F

LC
D

lever
connected

to
throttle
shaft

4

Remove

actuator

attaching
nuts

then
remove
actuator

5
Install

actuator
in

the
reverse

order
of
removal

6
After

installing
adjust
actuator

Refer
to

Adjustment
of

Idle

Speed

Air

Conditioning

IDLER
PULLEY
AND

COMPRESSOR
DRIVE
BELT

ADJ
USTMENT
OF
BELT
TENSION

Idler

pulley

Alternator

Crankshaft

pulley

Unit

mm
in

Idler

pulley

Fig
AC
25

Belt
Tension

Specified
compressor
belt

tension
is

8

to
12
mm
0
31
to
0
47

in
when

thumb

pressure
of
10

kg
22

Ib
is

applied
midway
between
idler

pulley

and

compressor
pulley

1
Loosen

idler

pulley
lock

nut
and

then

adjust
pulley
by
turning
adjusting

bolt

2

After

adjustment
tighten
idler

pulley
lock
nut
bolt

3
Remove
idler

pulley

4
Install

pulley
in
the

reverse

order
of
removal

5

Adjust
compressor
belt
tension

REMOVAL
AND

INSTALLATION

1

Jack

up
front

of
car
and
remove

under
cover

2
Remove
idler

pulley
lock
nut

and
loosen
belt
tension

adjusting
Fig
AC26
AC382A

Idler

Pulley

TIghtening
torque

@
3
7
to

5
1

kg
m
27
to
37
ft

lb

AC383A

Fig
AC
27

Compressor
and
Bracket

AC
19
REMOVAL

I

Operate

compressor
if

possible

at

engine
idling
speed
with
air
condi

tioner

controls
set
for
maximum
cool

ing
and

high
blower

speed
for20
to

30

minutes
with
all

windows

open
to

return

oil
into

compressor

2
Disconnect

battery
ground
cables

and

compressor
lead
wire
at
con

nector

3

Discharge
refrigerant
from

cool

ing
system
Refer
to

Discharging
Sys

tem

4

Jack

up
front
of
car
and

remove

under
cover

5
Loosen
idler

pulley
lock
nut
and

loosen
tension

adjusting
bolt

fully

Remove

compressor
drive
belt

See

Fig
AC
26

6
Remove

high
and
low
flexible

hoses
from

compressor

WARNING

Gradually
loosen

discharge
side

hose

fitting
and
remove
it
after

remaining
pressure
has
been
re

leased

CAUTION

Be
sure
to

immediately
put
plug
in

flexible
hose
and

compressor
open

ings

7
Remove
bolts

securing
lower

part

of

compressor

8
Remove
bolts

securing
upper
part

of

compressor
Hold

compressor
with

one
hand
when

removing
bolts
and

then
remove

compressor

With

compressor
clutch

up
lift

compressor
out
with

both
hands

CAUTION

00
not

attempt
to
leave
the
com

pressor
on
its
side
or

upside
down

for
more
than
10
minutes
as
the

compressor
oil
will
enter
the
low

pressure
chambers
If
under
that

condition

compressor
should
be

oper

ated

suddenly
internal

damage
would

result
To

expel
oil
from
chambers

hand
crank

compressor
several
times

in
its
installed
condition

REFRIGERANT
LINES
Air

Conditioning

@

I

J

L

S

r
Z
S
t

@

See

Fig
AC
29
When

replacing

flexible
hose
and
tube
observe
the

following

1

Before

starting
work
be

sure
to

discharge
system

2

When

disconnecting
tubes
be

sure
to

use
two

wrenches
on
both

tubes

3

After
discon

ecting
tubes

plug

all

openings
immediately
to

prevent

entrance
of
dirt
and
moisture

4

Compressed
air
must
never
be

used
to
clean

dirty
line
Clean
with

refrigerant

gas

5
In

connecting
tubes
be
sure
to

apply
compressor
oil
to

seating
surface

and
then

tighten
tubes
to

specified

tightening
torque
See

Fig
AC
30

Be

sure
to
use
two
wrenches
when

tightening
a
flare

nut
of
tube

Coat
seat
surfaces
with
com

pressor
oil
and
then

tighten

AC263

Fig
AC

30
Line
Connection
CD

6
Make
sure

refrigerant
line
is

clamped
securely
Start

engine
and

raise

engine
speed
to

inspect
if
there
is

vibration
or
unusual
noise

7

Conduct
leak
t
st
and
make
su
e

that
there
is
no
leak

from
connections

8
Refer
to

General
Service
for

evacuating
and

charging
system

COOLING
UNIT

REMOVAL

I

Disconnect

battery
ground
cable

2

Discharge

refrigerant
from

sys

tern
Refer
to
General
Service

3
Loosen

flare
nuts
at
each
con

nection
of
inlet

and
outlet

pipes
of

evaporator

AC
21
1

High
pressure
discharge
service

valve

2
Low

pressure
suction
service
valve

3

Compressor

4

Condenser

5
Receiver

drier

6

Cooling
unit

7

Low

pressure
switch

lightening
torque

kg
m
ft
lb

@
4

5
to

5
0
33
to
36

@
3
0
to
3
5
22
to
25

AC385A

Fig
AC
29

Refrigerant
Lines

CAUTION

Immediatelv
plug
up
all

openings

to

prevent
entrance
of

dirt
and

moisture

4
Remove
instrument
under

cover

5
Remove

glove
box

6
Disconnect

wiring
harness

con

nectors
from

compressor
relay
and

thermostat

7
Remove

upper
and
lower

attach

ing
bolts
and

remove

cooling
unit

AC386A

Fig
AC
31
Removing
Cooling
Unit

Com
pressor
OFF
I

I

Blower
makes

noise
Repair
or
re

place
blower

Bearings
of
com

pressor
clutch
or

idler
pulley

make
noise

Replace

C
l
W
Noisy
Compressor
itself
makes

noise
Repair
or

replace
com

pressor
Belt
is
loose

Adjust
belt

Suction
pressure
is
low

Strainer
in
pipe

Line
Is
restricted

Replace
strainer

Pipe
at
receiver

drier
outlet
has

low
temperature

Receiver
drier
is

restricted
Replace

receiver
drier
I

Fin
and
tube
of

evaporator
or

laminated
evapo

rator
have
some

dents
Replace
or
repair

evaporator

Expansion
valve
is

close
excessively

or
gas
leakage
from

thermo
bulb

Replace
expansion

valve
Compressor
ON
J

I

When
engine

rpm
is
changed

there
are
reso

nant
sounds

Retighten
com

pre
ssor
bracket

bolts
Piping
is
reso

nating
Add

clamp
Insufficient
cooling

Bubbles
in
sight
glaS

Check
refrigeration
line

for
gas
leaks
and
repair

leaks
if
any
Charge
re

frigerant
to
correct

level
In
case
of
too

many
leaks
stop
com

pressor
discharge
the

system
evaCUate
and

recharge
the
system

As
necessary
replace

receiver
drier

Air
in
system
may

cause
bubbles
in
sight

glass

System
pressure
and
temperature
of
discharge
air
llre

abnormal
Refer
to
Performance
Test
Diagnoses

for
detail

Suction
pres

sure
is
high

Expansion

valve
is
open

excessively
Replace
ex

pansion
valve
Discharge
pressure
is

high

Overcharge
of
refrigerant

Discharge
some
of
refrig

erani
to
correct
level

Air
is
mixed
in
Discharge

system
and
replace
drier

Evacuate
and
recharge

system
Condenser
s
fin
is
dented

or
clogged
with
dust

Clean
exterior
surface

with
water
No
bubbles
in

sight
glass

With
manifold
gauge

check
system
pres

sures
Measure
tem

perature
of
discharge

air
Refer
to
Perform

ance
Test
Blower
does
not

rotate
Refei
to
Blower

Motor
Diagnoses

Temperature
of
discharge

air
is
abnormal
but
system

pres5ure
is
normal

Suction
pressure
iJ

high
while
dis

charge
pressure
is

low
Valve
or
gasket

of
compressor
is

damaged
Repair
or
replace

compreuor
Check
air
flow

system
Refer
to
Air

Conditioner
Operation
Chart
Compressor
does
not
run

Refer
to
Com

pressor
Diagnoses

Check
grommets

on
car
s
dash

panel
for
air

leaks
check

other
seal
of

car

J
COnlp
reSSOI
clutch
is
not
J

engaged
c
00

ha
voltage
decreased

to
es
thall
lO
5V

Lead
wire
or
com

pressor
clutch
is

dead
I
Ground
terminal
of
coil

is
poor
a
t
connection

Repair
connection

Refer
to
CompreSior

Clutch
Diagnoses
J
J

r
In
c
e
Clutch
is
not
en

gaged
yet
replace

compressor
dutch

lr1

vetChatgO
of
Ief
ge1ant

I

I
e
refrigotant
gas
10
n
o
t
cnt
j

that
sight
gla
ss
of
receiver
drier
has

onlY
a
few
bubble

Engine5peed
l
OOrpm

i
l

r
Check
for
dis

charge
pressure

OK
if
dbcnarge

pres
ure
is

reduced
Discharge
pres

sure
is
not

reduced
l
Compressor
clutch
is
engaged
but
compre
sor

doe
not
IUn

Cbeck
and
re

adjust
gap
of

clutch
Clea
Il
oil
OJ
dust

on
contact
sur

face
of
clutch

if
slipping
con

ti
n
ues
rCPlaO
J

compressor
clutch
Check
belt
teMion

and
adjust
it

lfbelt
bwor
l
out

or
damaged
ie

pl
ce
iI

Air
in
refrigeration
System

J

Discharge
system
ftom
service

valve
on
discharge
side

Evacuate
a
nd
rech
arge
the

Lystem
J

When
torque
is
stm
grellt
repair

or
rtV1ace
compressor

j
T

son
rod
l

mp
teSSOI

j
Internal
problem

in
cornpre
sor
cyl

inder
Check
y
tem

Repau
or
replace

nece
tY
J
r
Compte
r
oille
ing
J

Air
blOW
on
spot
whcre
oil
leak
e
vidence
is

round
Then
check
for
refrigerant
leakS
us
n

leak
detectof

Refrigerant
leaking

Repau
01
replace

compttUOr
I

NO
teftig

lea
ing

Wipe
clean
oil

wi
h
Jag

L
Noisy
onlY
when

clutch
is
engaged

Check
for
oo
c

comprenor
mount

ing
Dolts

Retighten
bolts

Compressor
drive

belt
islOosc
Adjust

belt
ttM1on

If
cotTlpre
sor
is

noisY
yet
repair

or
replace
compres

sor
Noisy
when
clutch

is
not
engaged

Remove
cQm1JressOt

belL
Turn
pulley
of

compressot
clutch
by

hand
and
check
for

noise
If
noisC
is

MaId
repair
com

preM
or
clutCh

01
o
B
0
a
Ut
Ut
o
a
a
i
o
Ut
A
o
l
Cl
o
l
l

tC

Condition

I
FAULTY
CONDENSER

I

I

@
@

AC215A

I
HIGH
PRESSURE
liNE
BLOCKED

I

r

@

@

AC216A

I
FAULTY
COMPRESSOR

I

r
j
@

rg

AC217A
Air

Conditioning

o

cooling
action

engine

may
overheat

Bubbles

appear
in

sight

glass
of
drier

Suction
line
is

very
hot

Insufficient

cooling

Frosted

high
pressure

liquid
line

Insufficient

cooling

AC
39
Probable
cause

Condenser
is

often
found

not
functioning
well

Drier

clogged
or
restric

tion
in

high
pressure
line

Internal

problem
in
com

pressor
or

damaged
gasket

and

valve
Corrective
action

Check
fan
belt
and

fluid

coupling

Check
condenser
for

dirt

accumulation

Check

engine

coqling

system
for
overheat

Check
for

refrigerant

overcharge

Note
If

pressure
remains

high
in

spite
of
aU

above
actions
taken
re

move
and

inspect
the

condenser
for

possible

oil

clogging

I

Discharge

system

2
Remove

receiver
drier

or
strainer

and

replace

it

3

Evacuate
and

charge

system

I

Discharge
system

2
Remove
and
check

compressor

3

Repair
or

replace
com

pressor

4

Check
oil
level

5

Replace
receiver
drier

6
Evacuate
and

charge

system

PERFORMANCE
CHART

TEST
CONDITIONS

Test
car
location

Door
windows

Door

Hood

Air
lever

Temperature
lever

Fan
switch

Engine
speed
Indoor
or
in
the
shade

Open

Closed

Open

COOL
Ale

Max
cold

3rd

1
500

rpm

TEST
READING
Air

Conditioning

Inside
air

Recirculating
air

at

cooling
unit
inlet

Relative
humidity

40
to

60

60
to

80

Relative

humidity
Ambient
air

temperature

oe
OF

40
to

80
20
68

25
77

30
86

35
95

40

104
Discharged
air

temperature
at

center
outlet

oe
OF

Air

temperature

oC
OF

20
68

25
77

30
86

35
95

20
68

25
77

30
86

35
95
1
5
to
5
0
35
to
41

6
0
to
9
5
42
to

49

10
5

to
14
0
51
to
57

i5
O
to
19
6

59
to
66

5
0
to
8

0
41
to

46

9
5
to
13
0
49
to
55

14
0
to
18
0
57
to
64

19
0
to
23
0

66
to
73

Pressure

high
Discharge
side

kg
cm2

psi
Pressure
low
Suction
side

kg
cm
2

psi

9
8
to
10

7

139
to
152

10
5
to
11
8
149

to
168

12
0
to
13

9
171
to
198

13
9
to

16
7

198
to
237

16

5
to

20
5
235
to
292
1
1

to
1

8

16
to

26

ii

1

2
to
1
9
17
to
27

14
to
2
3
20

to
33

1

9
to
2
8
27
to

40

2
7
to
3
8
38
to

54

AC
41

r

Air

Conditioning

SERVICE
DATA
AND

SPECIFICATIONS

GENERAL

SPECIFICATIONS

Compressor

Model

Type

Displacement

Cylinder

Bore
x

stroke
cc
ell
in

rev
SC206

Yoke

100
6
10

mm
in

47

6
x
28
1

1
874
x
1
106

Clock
wise

View
from
drive
end
Direction
of
rotation

Lubrication

oil

Type

Capacity
in

refrigeration

system
cc
US
11

OZ

Imp
11
oz
SUNISO
5GS

237
8
0
8
3

Refrigerant

Type

Capacity
kg

lb
R
12

0
8
to
1
0
1

8
to
2
2

INSPECTION

AND
ADJUSTMENT

Belt

tension

mm
in

kg

lb

Fan

belt

applied
pressure
8
to
12

0
31
to
0
47

10
22

8
to
12

0
31
to
0
47

10
22
A
C

compressor
belt

applied
pressure

F
I
C
D

adJustment

Automatic
700

rpm

650

rpm

at
Du

position
When

AlC
is

ON

F

LC
D
is

actuated

800

rpm

800

rpm

at
Nu

position
Engine
model
Transmission
When

AlC
OFF

Manual

AI4
AI5

Clutch
hub
to

pulley
clearance
mm
in

0
4
to
0

6
0

016
to
0
024

AC
42