fuel filter DATSUN PICK-UP 1977 Service Manual

Yellow

line

Spark
delay
valve
to

distributor

Spark
delay
valve
to
vacuum
tube

Distributor

to
vacuum
tube

Vacuum
tube
to
carburetor

Vacuum
tube
to
canister

Green
line

Anti

backfire
valve
to
intake
mani

fold

Air

control
valve
to

emergency
air

relief
valve

Intake
manifold
to
vacuum
hose

connector

Intake

manifold
to
canister

CHECKING
ENGINE

COMPRESSION

COMPRESSION
PRESSURE

TEST

I
Warm

up
engine
sufficiently

2
Disconnect

all

spark
plugs

3
Disconnect
anti

dieseling
solenoid

valve
connector

4

Properly
attach
a

compression

tester
to

spark

plug
hole
in

cylinder

being
tested
Engine
Tune

up

I

ET010
Different

compression
in
two
or

more

cylinders
usually
indicates

an

improperly
seated
valve
or
broken

piston
ring

9
Low

compression
in

cylinders
can

result
from
worn

piston
rings
This

condition

may
usually
be

accompanied

by
excessive

fuel

consumption

TEST
RESULT

If

compression
in

one
or
more

cylinders
is
low

pour
a
small

quantity

of

engine
oil
into

cylinders
through

the

spark
plug
holes
and
retest
com

pression

I

If

adding
oil
increases
the
com

pression
pressure
the
chances
are
that

rings
are

faulty

2

If

pressure
stays
low

probable

cause
is

that
valve
is

sticking
or

seating

improperly

3
If

cylinder
compression
in

any

two

adjacent
cylinders
is

low
and
if

adding
oil
does
not

help
the

compres

sian
there
is

leakage
past
the

gasket

surface

Oil
and
water
in

combustion
cham

bers

can
result
from

leakage

IGNITION
AND

FUEL
SYSTEM
Fig
ET
10

Teding

compression

pressure

5

Depress
accelerator

pedal
to

open

throttle
and
choke
valves

Note
Do

not

pump
pedal

6
Start

engine
as

quickly
as

pos

sible

7

Compression
pressure

kg
cm2

psi
at

rpm

Standard

12
0

171
350

Minimum

9

0
128
350

8

Cylinder
compression
in

cylinders

Should
not
be
less
than

80
of

highest

reading

CONTENTS

CHECKING
BATTERY
ET
9

CHECKING
DISTRIBUTOR
CAP
ROTOR

CHECKING
AND

ADJUSTING
IGNITION
AND
CONDENSER
ET
11

TIMING
ET
10

CONDENSER
ET
11

ADJUSTING
IGNITION
TIMING
ET10

ADJUSTING
CARBURETOR
IDLE
RPM

CHECKING
AND
REPLACING
SPARK
PLUG
ETlO
AND
MIXTURE
RATIO
ET

11

CHECKING
DISTRIBUTOR
OPERATING
IDLE

LIMITER
CAP
ET
12

PARTS
AND

IGNITION
WIRING
ETlO
CHECKING
CARBURETOR
RETURN
SPRING
ET

12

BREAKER
POINTS

lNon
California
models

ET
10
CHECKING
CHOKE
MECHANISM

AI
R

GAP
lCalifornia
models
ET11
Choke

plate
and

linkage
ET13

DISTRIBUTOR
ET
11
CHECKING
FUEL

LINES

IGNITION
WIRING

ET
11
Hoses

pipings
connections
etc

ET
13

REPLACING
FUEL
FILTER
ET
13

CHECKING
BATTERY

Check

electrolyte
level
in

each
bat

tery
cell
I
Unscrew

each
filler

cap
and

inspect
fluid
level
If
the
fluid
is
low

add
distilled
water
to

bring
the
level

up
approximately
10
to
20
mm
0
39

H
9
to
0
79

in
above
the

plates
Do
not

overfill

2
Measure
the

specific
gravity
of

battery
electrolyte

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

3
If
there

is
a
leak

remove

top

cover
from

purge
contiol
valve
and

check

for
dislocated
or

cmcked
dia

phragm
If

necessary
replace
dia

phmgm
kit

which
is
made

up
of
a

retainer

diaphragm
and

spring

I
@

1
Cover

2

Diaphragm

3
Retainer

4

Diaphragm
spring

Fig
ET
47
ET350

Carbon
caniater

purge

control
valve

Carbon
unlster

filter

Check
for
a
contaminated

element

Element
can
be
removed
at

the

bottom
of
canister

installed
on
vehicle

body

Fig
ET
48

Replacing
carbon

canister

filter

Fuel
tank

vacuum
relief

valve

operation

Remove
fuel
filler

cap
and
see
it

functions

properly

I

Wipe
clean
valve

housing
and
have

it
in

your
mouth

2

Inhale
air
A

slight
resistance

ac

companied
by
valve
indicates
that

valve
is
in

good
mechanical
condition

Note
also
that

by
further

inhaling
air

the
resistance
should
be

disappeared

with
valve
clicks
Engine
Tune

up

3
If
valve

is

clogged
or
if
no
resist

ance
is

felt

replace
cap
as
an
assem

bled
unit

r

u

ET369

Fig
ET
49
Fuel

filler
cap

CHECKING

CATALYTIC

CONVERTER

INSPECTION

Preliminary
inspection

Visually
check
condition
of
all

component
parts
including
hoses

tubes
and
wires

replace
if

necessary

Refer
to

Inspection
of
A
I

S
on

page
EC
17

Catalytic
converter

Whether

catalytic
converter
is
nOf

mal
or
not
can
be
checked

by
ob

serving
variation
in
CO

percentage

The

checking
procedure
is

as
follows

Apply
parking
brake
Shift

gears

into

Neutral
for
manual
transmission

and
Neutral
or
Park
for
automatic

transmission

1

Visually
check

catalytic
converter

for

damage
or
cracks

2
Remove
air

hose
between
5

way

connector
and
air

check
valve

Plug
the

disconnected
hose
to

prevent
dust

from

entering
Refer
to

page
ET
12

3
Check
carburetor

pipes
for

proper

connection

4

Warm

up
engine
sufficiently

5
Race

engine
1
500
to
2
000

rpm

two

or
three
times
under
no
load
then

run

engine
for

one
minute
at

idling

speed

6

Adjust
throttle

adjusting
screw

until

engine
attains
to

specified
speed

Refer
to

page
ET
12

7

Check

ignition
timing
If

neces

sary

adjust
it
to

specifications
Refer

to

page
ET
10

ET
23
8

Adjust
idle

adjusting
screw
until

specified
CO

percentage
is

obtained

Refer
to

page
ET
12

9

Repeat
the

adjustment
process
as

described
in

steps
5
to

8
above
until

specified
CO

percentage
is

obtained

Note

Adjustment
in

step
9
should
be

made
ten
minutes
after

engine
has

warmed

up

10
Race

engine
1
500
to
2
000

rpm
two
or
three
times
under

no
load

and
make

sure
that

specified
CO

per

centage
is
obtained

I
1
Remove

cap
and
connect
air

hose
to
air
check
valve

If

idling

speed
increases

readjust
it

to

specified
speed
with
throttle
ad

justing
screw

12
Warm

up
engine
for
about
four

minutes
at
2
000

rpm
under
n
load

13
Measure

CO

percentage
at

idling

speed
After

step
12
has
been
com

pleted
wait

for
one
minute
before

making
CO

percentage
measurement

14

If
CO

percentage
measured
in

step
13
is
less
than
0
3
the

catalylic

converter
is

normal

15
If
CO

percentage
measured
in

step
13
is

over
0
3
recheck
A
I
S

and

replace
air

check
valve
Then

perform
inspection
steps
12

and
13

16
If
CO

percentage
is
still

over

0
3
in

step
15

catalytic
converter
is

malfunctioning
Replace
catalytic
con

verter

CHECKING
FLOOR

TEMPERATURE

WARNING
SYSTEM

INSPECTION

Floor

warning
temperature

system

Apply
parldng
brake
Shift

gears

into
Neutral
for

manual
transmission

and
Neutral
or
Park
for
automatic

transmission

1

Ensure
that
floor
tern

perature

warning

lamp
lights
when

ignition

switch
is

turned
to
the
S

position

If
not
check

lamp
for
burned

bul
bs

Condition

IMPROPER
ENGINE

IDLING

Fuel

system
out
of

order

Low

compression

Others

High
engine
idle

speed
Engine
Tune

up

Probable
cause

Clogged
or

damaged
carburetor

jets

Incorrect
idle

adjustment

Clogged
air
cleaner
filter

Damaged
manifold

gaskets
or
carburetor

insulator

Improper
float
level

adjustment

Loose
air

hoses
or
air

fuel
mixture
hoses
of

carburetor

Malfunctioning
carburetor
choke

Malfunctioning
anti

backfire
valve

Malfunctioning
automatic

temperature
con

trol
air

cleaner

Inoperative
idle

compensator

Carbon
canister

purge
line
hose

damaged
or

disconnected

Stick
E

F
E
valve
shaft

Incorrect
valve
clearance

Extremely
low
revolution

Faulty
malfunction
of
the

ignition
system

spark
plug

high
tension
cable
breaker

point
ignition
coil
etc

Incorrect
basic

ignition
timing

Malfunction
of
choke
valve
or

linkage

Malfunction
of
vacuum
motor
sensor
or

hoses
of
air
cleaner

Incorrect
idle

adjustment

Clogged
air
cleaner
fdter

Malfunction
of
idle

compensator
of

air

cleaner

Malfunction
of
E
G
R
control
valve

Loose
manifold
and

cylinder
head
bolts

Dragged
accelerator

linkage

Incorrect
idle

adjustment

Malfunction
of
B
CDD

system

Malfunction
of

speed
switch
and
harness

ET
29
Corrective
action

Clean
or

replace

Adjust

Replace
element

Replace
gasket
or
insulator

Adjust

Check
for
loose
connections

Check
and

adjust

Check
for
loose
connection
of
vacuum
hose

Check
A

r
C
air
cleaner

Check
for
connection
of
idle

compensator

hose

or
replace
idle

compen
tor

Connect
or

replace

Repair

Previously
mentioned

Adjust

Adjust

Replace

Adjust

Adjust

Check
for
loose
hoses

Replace
system
com

ponents
if
necessary

Adjust
idle

speed

Replace
air
cleaner
fdter

Replace

Clean
or

replace

Retighten
bolts

Check
and

correct
accelerator

linkage

Adjust
idle

speed

Check
for
loose

vacuum
hose
and
harness

connections

Adjust
or

replace
if

necessary

Check
for
loose
connections

Repair
or

replace
if

necessary

Condition

ABNORMAL

COMBUSTION

backfue
afterflre

run
on
etc

Improper

ignition
timing

Fuel

system
out
of

order

Faulty
cylinder
head
etc

Others

EXCESSIVE
OIL

CONSUMPTION

Oilloak

Excessi
lo
oil

consumption

Others
Engine
Tune

up

probable
cause

Improper
ignition
timing

Improper
heat

range
of

spark
plugs

Damaged
carburetor

or
manifold

gasket

backfue
afterfire

Clol
l
ed
carburetor

jet

Improper
function
of

the
float

Uneven

idling
Run
on

Improperly
adjusted
B

C
D
D

set

pressure

Malfunction
of
anti

dieseling
solenoid
valve

Malfunction
of
auio
choke

Improperly
adjusted
valve
clearance

Excess
carbon
in

combustion
chamber

Damaged
valve

spring
backfire
afterflre

Malfunction
of

A
T
C

air
cleaner

Inoperative
ariti
backfue
valve

Loose
oil
drain

plug

Loose

or
damaged
oil

pan
gasket

Loose
or

damaged
chain
cover

gasket

Worn
oil
seal
in
front
and
rear
of
crankshaft

Loose
or

damaged
locker
cover

gasket

Improper
tightening
of
oil
filter

Loose
or

damaged
oil

pressure
switch

Cylinder
and

pioton
wear

Improper
location
of

piston
ring

gap
or

reversely
assembled

piston
ring

Damage
piston
rings

Worn

piston
ring
groove
and

ring

Fatigue
of
valve
oil
seal

lip

Worn
valve

stem

Inadequate
quality
of

engine
oil

Engine
overheat

ET32
Corrective
action

Adjust
ignition
timing

Use

specified
spark
plugs

Replace
them
with
new

parts

Disassemble
carburetor
and
check
it

Adjust
the
level
and
check
needle
valve

Adjust

Adjust

Check
or

replace

Adjust

Adjust

Remove
head
and

get
rid
of
carbon

Replace
it
with
a
new
one

Check
for
loose
vacuum
hoses

Replace
if

necessary

Replape

Tighten
it

Renew

gasket
or

tighten
it

Renew

gasket
or

tighten
it

Renew
oil
seal

Renew

gasket
or

tighten
it
but
not
too

much

Renew

gasket
and

tighten
it
with
the

proper

torque

Renew
oil

pressure
switch
or

tighten
it

Overhaul

cylinder
and
renew

piston

Remoun
t

piston
rings

Renew

rings

Repair
or
renew

piston
and

cylinder

Renew

piston
and

piston
ring

Replace
seal

lip
with
a

new
one

Renew
valve
or

guide

Use
the

designated
oil

Previously
mentioned

r

I

I

PRELIMINARY
CLEANING
AND

INSPECTION

DISASSEMBL
Y

PRELIMINARY

CLEANING
AND

INSt

ECTION

Before

disassembling

engine
note

the

following

I
Fuel

oil
or
water

may
leak

past

cylinder
head
and
block
Prior
to

disassembling
check

cylinder
head

1
1ltermal
vacuum
valve

2
Check

valve

3
Altitude

compensator

in

air
cleaner

4
Air

gallery
pipe

S

Auto
choke

6
Automatic

temperature

control
air

cleaner

7
Anti
8ackfire
valve
A
B

valve

8
Boost
Controlled

Deceleration

Device
Bee
D
D

9
P
c
v

valve

to
Air
relief
valve

11
E

G
R

control
valve

12
B
C
D
D

control
valve
and

solenoid
valve

13

Emergency
air

relief
valve

14
Air

pump
air
cleaner

IS
Carbon
canister

16
Air
control

valve

11
Air

pump
Engine
Mechanical

ENGINE

DISASSEMBLY

CONTENTS

EM
4

EM
4
PISTONS
AND
CONNECTING
RODS

CYLINDER

HE
AD
EM
7

EM
7

front
chain

cover
oil

pan
and
oil

filter

gaskets
lInd
crankshaft
and
water

pump
seals
for

signs
of

leakage
past

their

gasketed
surfaces

2
Check
carburetor
and

fuel

pump

for
condition
fuel
hoses
for

deteriora

tion
cracks

or

leakage
of
fuel

past

their

jointed
or
connected

surfaces

Fig
EM

0
Emiuion
control
devic
s

California
mod
18
E
T366

3
Remove

carburetor
air

cleaner

Remove
fresh

air
duct

Disconnect
hot
air
duct
from

air

cleaner

Disconnect
air

cleaner
to
air

pump

hose
at
air

cleaner

Disconnect
air

cleanef
to
rocker

cover

hose
at
rocker
cover

Disconnect

air
cIeaner

to
air

con

trol

valve
hose
at
air

cleaner
Cali

fornia

models

only
Disconnect
air

cleaner
to
A

B
valve

hose
at
air

cleaner

Disconnect
air

cleaner
to

related

part
vacuum
hoses
at
air

cleaner

Loosen
air

cleaner
band
bolt
and

remove
carburetor
air

cleaner
as

sembly
from

carburetor

4

Plug
up
carburetor
air

horn

to

prevent
entry
of

foreign
matter

5

Remove

alternator
drive

belt

alternator
and

alternator
bracket

EM
4
6

Remove
air

pump
drive

belt
cool

er

compressor
and
idler

pulley
if

so

equipped

7
Remove
starter
motor
from
trans

mission

8

Visually

inspect
cylinder
head

cylinder
block
rocker
C
Ner

front

chain
cover
oil

pan
and
all
other
outer

parts
for
oil
water
and
fuel
leaks

breakage
or

missing
parts
such

as
bolts

and
nuts

9

Check

piping
and
electrical
cir

cuits
for
deterioration

breakage
fit

tings
discontinuity
or
insulation

DISASSEMBLY

To

remove

engine
from
vehicle

refer
to

the
instructions
under
the

Engine
Removal

and
Installation

ER
section

I

Remove
transmission
from

en

gine

2
Remove

clutch

assembly
from

flywheeL

3

Thoroughly
drain

engine
oil
and

coolan
t

by

removing
drain

plugs

Store

engine
oil
and

coolant
if

they

are

to
be

used

again

4
Place

engine
assembly
on

engine

stand

I

Remove

cooling
fan

2

Remove

right
engine

mounting

bracket

3

Remove
oil
filter
with
Oil

Filter

Wrench
STI9320000

4

Remove
oil

pressure
swi

tch

5

Install

engine
attachment
to

cylinder
block

utilizing
bolt

holes
in

alternator

bracket
and

water
drain

hole

6
Set

engine
on
stand

Engine
Attachment

ST05260001

Engine
Stand

ST050I

SOOO

30
Install
heatshieid

plate
on
mani

fold
assembly

31
Install
air

gallery
pipe
on
ex

haust
manifold

32
Install
manifold

gasket
and

manifold

assembly
on

cylinder
head

Tightening
torque

1
2to
1

6kg
m

8
7
to
11
6
ft
lb

33

Install
blow

by
gas

pipe
on

cyl

inder

block
and
tighten
with
rear

engine
slinger

34
Install
thermostat
housing

gas

ket
thermostat

housing
and

thermo

stat

35
Install
thermal
vacuum
valve
on

thermostat

housing
Before

installing

apply
a

liquid
packing
slightly
to
the

threads

36

Install
FJ

C
D
bracket
on

cylin

der

head

37

Install
E
G
R

passage
and

E
G
R
valve
on
intake
manifold

38
Connect
E

G
R
tube
to
E

G
R

tube
and

exhaust
manifold

39
Install
check
valve

on
air

gallery

pipe

40
Install
air
cleaner
bracket
on

intake
manifold

41
Install
air
control
valve
on
air

cleaner
bracket
California
models

42
Install
vacuum
and
fuel
tubes

combined
on

cylinder
head

43
Install
distributor

assembly

44
Install

heatshield
plate

joint

seat

and
carburetor

Carbure10r
tightening

torque

0
5

to
1

0

kg
m
3

6
to
7
2

ft
lb

Note
When

instalUng
joint
seat
be

sure
to

put
the
duct
into

primary

hole
in

intake
manifold

S

J

Heatshield

plate
4
Joint

seat

2

Primary
hole
5

Secondary
hole

3
Duct

EM534

Fig
EM
I06

Installing
carburetor

joint
seat
Engine
Mechanical

45
Install
dash

pot
bracket
and

dash

pot
to
intake

manifold

46
Connect
all
air

vacuum
and
fuel

hoses

and
then

secure
with

clamps

I
Cylinder
block
to

P
C
V
valve

hose

2
A
B

valve
to
E

G
R

passage
vac

uum
hose

3
A
B

valve
to
E
G

R

passage
air

hose

4
Vacuum
tube
to
carburetor
vac

uum
hoses

5
Fuel
ube

to
carburetor
fuel

hose

6
Fuel
tube
to
fuel

pump
fuelhose

7
Distributor
to
vacuum
switch
or

spark
delay
valve
vacuum
hose

8
Air
control
valve
vacuum
hose

9
Check
valve

to
air

control
valve

hose

10
Thermal
vacuum
valve
to

E
G
R
valve
vacuum
hose

I
I
Thermal
vacuum
valve
to

vacuum
tube
hose

47
Install
carburetor
air

cleaner
on

carburetor
and
then
connect
air

and

vacuum
hoses

as
follows

I

Air
cleaner
to

exhaust
manifold

hot

air
duct

2

Air
c1eaner
to
air

pump
hose

3

Air
cleaner
to
rocker

cover
hose

4

Air
cleaner

to
air
control
valve

hose

5

6

48
Install

spark
plugs
in

place

49
Connect
all
distributor

high
ten

sion

cables
to

spark
plugs

50
Install
air

pump
drive
belt
cool

er

compressor
and
idler

pulley

51

Install
left

engine
mounting

bracket

52
Install
clutch

assembly
on

flywheel
with
Clutch

Aligning
Bar

KV30100200
Air

cleaner
to
A
B

valve

hose

Other
vacuum
hoses

Tightening
torque

1
2
to
2
2

kg
m

8

7
to
15
9

ft
lb

EM
26
I

I

KV30100200

EM440

Fig
EM
I07
In

talling
clutch
embly

53

Using
an
overhead
hoist
and

lifting
cable
hoist

engine
away
from

engine
stand
and

then
down
onto

engine
carrier

54
Install

right
engine
mounting

bracket
oil
filter
oil

pressure
switch

oil

level

gauge
and
water

drain

plug

When

installing
oil

filter
fasten
it
to

cylinder
block

by
hand

Note
Do
not

overtighten

flit
or
oil

leakage
may
occur

55
Install
alternator
bracket

adjust

ing
bar
alternator

cooling
fan

and

belt

56

Adjust
the
deflection
of
drive

belts
when

thumb

pressure
is

applied

midway
between

pulleys
A

pressed

force
is
above
10

kg
22
0
lb

Deflection

of
drive
belts

8
to
12
mm

0
315

to
0
472
in

EM613

Fig
EM
lOB
Fan
belt
tension

57
Fill

engine
oil

up
to

specified

level

DATSUN
PICK
UP

MODEL
620
SERIES

l
NISSAN

I

NISSAN
MOTOR
CO
LTD

TOKYO
JAPAN
SECTION
EF

ENGINE

FUEL

AUTOMATIC
TEMPERATURE

CONTROL
A
T
C
l

AIR
CLEANER

IDLE
COMPENSATOR

FUEL
FILTER

MECHANICAL
FUEL
PUMP

ELECTRIC
FUEL
PUMP

CARBURETOR
H
2

H
7

H

8

H

9

H

ll

H
14

Engine
Fuel

AUTOMATIC

TEMPERATURE
CONTROL
A
T

C

AIR

CLEANER

DESCRIPTION

OPERATION

A
T
C

AIR
CLEANER

HOT
AIR

OPERATION

A
T
C
AIR
CLEANER
COLD
AIR

OPERATION

A
T
C
AIR
CLEANER
COLD
AND

HOT

AIR
OPERATION

TEMPERATURE
SENSOR

DESCRIPTION

The
air

cleaner
removes
dust
and

dirt
from
the

air
before

it
enters
the

carburetor
and

engine
It
also

muffles

noise

resulting
from
the
intake

of
air

into
the

engine

The
air

cleaner

especially
designed

for

improved
exhaust
emission

control

is
referred
to

as
Automatic

Tempera

ture
Control

Air
Cleaner
In
order
to

reduce
HC
emission

when
the

under

hood

temperature
is

below
300C

860F
the

automatic

temperature

control

system
maintains
the

tempera

ture
of
air
to

be
sucked
in
the

carbure

tor
at
30

to
540C
86
to
1290F

thereby
enabling
lean

setting
for

carburetor

calibration
n

addition
to

this
the

automatic

temperature
con

twl

system
is

effective
to

improve

warm

up
characteristics
of
the

engine
CONTENTS

EF
2

EF
3
VACUUM

MOTOR
AND
AIR

CONTROL

VALVE

REMOVAL
AND

INSTALLATION

TEMPERATURE

SENSOR

VACUUM

MOTOR

FRESH

AIR

DUCT

AIR

CLEANER

INSPECTION

1
AIR

CLEANER
ELEMENT

2

HOT
AIR

CONTROL

SYSTEM
EF
3

EF
4

EF
4

EF
5

and
to

remove

carburetor

icing

The

A
T
C
air

cleaner

system
con

sists

of
the

following
devices

1
Air
cleaner

element

The
air

cleaner

element

employed
is

a

viscous

paper
type
It

requires
only

periodical
replacment
and
should
not

be

cleaned

2

Automatic

temperature
control

air

cleaner

In
the
A

T
C
air

cleaner
the
air

control
valve
is
actuated

by
intake

manifold

vacuum
to
control

the
intake

air
flow

circuit
The

temperature
sen

sor
detects
the

temperature
inside
the

air

cleaner
and

opens
or
closes
the

vacuum

passage

3

Hot
air
duct

The
hot
air
duct
is

mounted
on
the

exhaust
manifold
The
air
warmed

up

EF
2
EF
5

EF

5

EF

5

EF

5

EF
5

EF
6

EF
6

EF

6

EF

6

between
the

exhaust
manifold
and
hot

air
duct

is
led
to
the
air
cleaner

through
the

hose

4
Blow

by

gas
filter

The
blow

by

gas
nIter
removes
dirt

and
oil
from
the

blow

by
gas
sucked

in

the
air
cleaner
from
the

engine
rocker

cover

5

Fresh
air

duct

Except
for

Canada

The
fresh
air

duct
leads
the

outside

fresh
air

directly
to

the
air
cleaner

6
Idle

compensator

See

paragraph
Idle

Compensator

Page
EF
7

7

Altitude

compensator
California

models

See

paragraph
Altitude

Compensa

tor

Page
EF
20

Engine
Fuel

REMOVAL
AND
INSTALLATION

Remove
air
cleaner

cover

2
Remove
hose

connecting
idle

compensator
and
3

way
connector

3
Loosen
screws

securing
idle
com

pensator
to
air

cleaner
then
remove

idle

compensator

Notes

a
When

removing
idle

compensator

remove

gasket
and

plate

b
When

removing
screw

securing
idle

compensator
to
air

cleaner
be
care

ful
not
to

miss
the
saew

4
To
install
reverse
the
removal

procedure

INSPECTION

I
Check

tha
t
valve
IS
m
closed

position
when
bi

metal

temperature
is

lower

than

operating

temperature
To

check
breathe
air
into

tube
or
suck

DESCRIPTION

The
fuel
fJlter
is

a

cartridge

type
It

uses
a

paper
element
which
can
be

checked
for
condition
from
the
out

side
EF718

Fig
EF
15
Location

of
idle

compenl
otor

air
If
excessive
air

leakage
is
found

at

the
valve

replace
idle

compensator
as

an

assembly
Note
that
two
idle
com

pensators
are
mounted
to
air
cleaner

and
that
it
is

necessary
to

plug
the

valve
of
one
of
these
idle

compensa

tors
so
as
to

prevent
air
leak
while

checking
the
other
one

@

CD

I

tl

1
Orifice

2
Rubber
valve

EF225

Fig
EF

16
Checking
idle

compelll
lor

FUEL
FILTER

1

Body

2

Paper
element

3
Cover
1

EFOO5

Fig
EF

18
Sectional
view

of
cartridge

type
fuel
filter

EF

8
Note

When

checking
idle

compensa

tor
on
vehicle
disconnect
hose

leading
to
idle

compensator
and

connect
other
hose
then

carry
out

check
as
descn
bed
above

2

When
bi
metal

temperature
is

above
the

specified
operating

tempera

ture

visually
check
to
see
if
the
valve

is
in

open
position
If

valve
is
not

open
replace
idle

compensator
as
an

assembly

Watcr

temperature
Observe

valve

11t
No

1
Bknctal

60
to
70De

140
to
1580F

NO
2
Bi
metal

70
to

900C

158to
1940F

EF226

Fig
EF
17

Checking
idle

compensator

3
Others

I
Check

hoses
for

correct
installa

tion

distortion
or
cracks

2

Check
rubber
valve
seat
of
idle

compensator
for

sticking
or

any
other

faulty
conditions

REMOVAL

Disconnect
inlet
and
outlet
fuel

lines
from
fuel

fJlter
and
remove
fuel

fJlter

Note

Before

disconnecting
fuel
lines

use
a
container
to

receive
the
fuel

remaining
in
lines