1977 DATSUN PICK-UP air filter

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

3
Check

diaphragm
for

small
holes

carcks
or
wear

4

Check

rocker
arm
for
wear
at
the

mating
portion
with

camshaft

5

Check
rocker
arm

pin
for
wear
A

worn

pin
may
cause
oil

leakage

6
Check
all

other

components
for

any
abnormalities
and

replace
if
neces

sary

DESCRIPTION

INSPECTION

REMOVAL
AND

INSTALLATION

DESCRIPTION

The
electric
fuel

pump
is

adopted

on
air

conditioner

equipped
models
Engine
Fuel

ASSEMBLY

Reverse

the
order
of

disassembly

Closely
observe
the

following
instruc

tions

L

Use
new

gaskets

2

Lubricate
rocker
ann
rocker
arm

link
and

rocker
arm

pin
before
installa

tion
3

To
test
the

function

proceed
as

follows

Position
fuel

pump
assembly
about

I

meter
3
3
ft

above
fuel
level
of

fuel

strainer
and
connect
a

pipe
from

strainer
to
fuel

pump

Operate
rocker

arm
by
hand
If

fuel

is

drawn

up
soon
after
rocker
arm
is

released

fuel

pump
is

functioning

properly

ELECTRIC
FUEL
PUMP

CONTENTS

EF
11

EF
11

EF
12
DISASSEMBL
Y

ASSEMBL
Y

TROUBLE

DIAGNOSES
AND

CORRECTIONS
EF
12

EF
12

The
silicon
transistor

type
fuel

pump

consists
of

a
transistor
diodes
a

sole

I
Tr

lOsistor

6
Ou
tIet
valve

2

Plunger

7
Return

spring

3

Diaphragm

8
Filter

4

Diode

9

Magnet

5

Magnet
coil

10
Inlet
valve

INSPECTION

I
Disconnect
fuel
hose
at

pump

outlet

2

Connect

a
suitable
hose

approxi

mately
6

mm
0

24
in
inner

dia

meter
to

pump
outlet
ev
J

J

Note
If
diameter
is
too
small
the

following

proper
delivery

capacity

cannot
be
obtained
even
if

pump

functions

properly

EF
11
EF
13

noid
a

pump
mechanism
and
filter

parts

I
T
nsistor

2

Re
ist
f
I

3
Dinde

4

Signal
coil

5
Main
coil

6
Resistor
3

7
Zener
dlOdl

8

Resistor
2

EF719

Fig
EF
22
Construction

of
electric

fuel

pump

3

With
hose
outlet
in
a

higher
posi

tion

than

pump

operate
pump
and

check

delivery
capacity
for
more
than

15

seconds

4

The

capacity
should
be
I
400

cc

854
co
in
in
one
minute
or
less

If
no

gasoline
or

only
a

little
flows

from

open
end
of

pipe
with

pump

operated
or
if

pump
does

not
work

perform
the

following
diagnosis

Notes

3
Do
not

connect
battery
in
reverse

polarity
which
if
left
for
a

long

time
would

damage
transitor

circuit
and
disable

pump
Engine
Fuel

b
Do
not
let
fall

pump
as
it

may

damage
electronic

components

c
Do
not

apply
overvoitage
max

l
8Y

Overvoltage
starting

by

quick
charge
or

tage
running

would
deteriorate
or

damage
elec

tronic

components

Fuel

pressure
maximum

0
32

kg
cm
4
6

psi

REMOVAL
AND
INSTALLATION

Flom
fuel
tank

Electric
fuel

pump
is
installed
on

bracket
with
two
bolts
This
bracket
is

located
on
R
H
side
member

adjacent

to
fuel
tank

I
Remove
inlet
hose
from
fuel

pump
Also
remove
outlet
hose
run

ning
to

engine
Receive
fuel

remaining

in
fuel
hose
in
a
suitable
container

2
Disconnect
harness
at

connector

3
Remove
bolts

securing
fuel

pump

to
bracket
and
detach
fuel

pump

4

Installation
is

the
reverse
order
of

removal

9

@

1
Cover

2

Magnet

3
Cover

gasket

4
Filter

5
Gasket

6

Spring
retainer

7
Washer
8
O

ring

9
Inlet
valve

10
Retutn

PIing

11
Plunger

12

Plunger
cylinder

13

Body
To
carburetor

1
Elecuic
fuel

pump

2

Mounting
bracket

3
Fuel
mter

EF72D

Fig
EF
23
Electric
fuel

pump

DISASSEMBLY

Do
not
disassemble
unless

pump
is

faulty

I
Remove

cover
with
wrench
and

take
out
cover
gasket
magnet
and

filter
from

pump
body

2
When

removing
plunger
take
out

spring
retainer
from

plunger
tube

3
Then
take
out
washer
O

ring

inlet
valve
return

spring
and

plunger

from
tube

Note
Do
not
disassemble
electronic

components
If

n

replace

with
new
ones

6

EF721

Fig
EF
24

Exploded
view

of
electric
fuel

pump

EF
12
ASSEMBLY

I

Before

assembly
clean
all

parts

with

gasoline
and

compressed
air

com

pletely

Notes

a
If

gask
t

an
d
fdterare

faulty
r

place

b
Clean

magnet
and
cover
for
fault

c
Take
care
not
to
defonn
thin
tube

d
Assemble

plunger
return

spring

inlet
valve
O

ring
washer
and
set

spring
retainer
in
that
order

e

Assemble
filter

gasket
and
cover

with

f

Tighten
cover
with
wrench
to
the

stopper

If

component
parts
are

dirty
after

disassembly
clean
as
follows

Wash
fIlter
and
strainer
with
clean

gasoline
and
blow
with

compressed

air
When

cleaning
parts
check

fllter
for
fault
If

faulty
replace

Wash

plunger
plunger
cylinder
and

inlet
valve
with
clean

gasoline
and

blow
dust
off

with

compressed
air

2
Check

c
v
m
lI

parts
for
wear

or

damage

If

they
are
found

faulty

replace

them

3

Insert

plunger
assembly
into

plunger
cylinder
of

body
and

apply

electric
current
to
it

Move
the

assembly

up
and
down

If
the

assembly
does
not
move
it

shows

that
the
electric

uuit
is

faulty

and
it
must
be

replaced

Engine
Fuel

TROUBLE
DIAGNOSES
AND
CORRECTIONS

Condition

Fuel

pump
fails
to

operate

Fuel

pump
fails
to

discharge
sufficient

flow

Insufficient
fuel

discharge
during

high
speed
travelling

Low
float
level

at

idling

Fuel

pump
is
actuated

more

frequently
than

under
normal
condi

tion

Rattling
noise
Probable
cause

Terminals
or
connections
loose

Rust
on
terminals
or

grounding
metal

Frozen

liquid
in

plunger
or

pump

Clogged
filter

Insufficient
fuel

Air
in

fuel
hose

through
connections

Hose
necked
down
or
bent

Fuel
tank
breather
tube
bent
or
necked

down

Weakened
return

spring

Air
sucked

through
connection
fuel
hose

and
fuel

pump
joint

Fuel
hose
on
suction
side
bent

Clogged
fIlter

Mounting
bolts
loose

EF
13
Corrective
action

Retighten

Clean

Clean

plunger
assembly

Replace
pump
if

plunger
is

stuck
or
seized

Clean

pump
interior
Clean
and

if

necessary

replace
fIlter

Replenish

Apply
a

coating
of
end
sealing

compound
to

connections
and

retighten

Check
and
correct

Check
and
correct

Replace

Apply
a

coating
of
end

sealing
compound
to

connection
and

retighten

Check
and
correct

Clean
or

replace
fIlter

Retighten

tZrJ

I
Fuel

nipple

2
Fuel
filter

3

Needle

4
Float

S

Primary
main

jet

6
Idle

adjust
screw

7
I
die
hole

8

Primary

bypass
hole

9

Primary
throttle
valve

10

Primary
altitude

compensator

pipe
California
models

11

Secondary
altitude

compensator

pipe
California
models
Engine
Fuel

jli@

I

12
Air
bleed

13
Primary
slow

jet

14

Plug

15

Primary
slow
air

bleed

6

Primary
main
air
bleed

17

Primary
air

vent

pipe

8
Primary
main
nOlzle

Note
Do

not
remove
the

parts
marked
with
an
asterisk

PRIMARY
SYSTEM

Prlmar
main
s
stem

The

primary
main

system
is
a

Stromburg

type
Fuel
flows
as
shown

in

Figure
EF
25

through
the
main

jet

mixting
with
air

which
comes
in

from

the
main

air
bleed
and

passes
through

the

emulsion
tube
and
is

pulled
out

into

the
venturi

through
the
main

nozzle

IdUns
and
slow
s
stem

During
low

engine
speed
as

shown

in

Figure
EF
25

fuel
flows

through

the
slow

jet
located
on
rear

right
side

of
main

nozzle

mixing
with
air

com

ing
from
the
1st
slow
air
bleed

again

mixing
with
air

coming
from
the
2nd

slow
air
bleed
and
then
is

pulled
out
I

III

@

19

Choke
valve

20

Primary
small
venturi

21

High
speed
enricher

air

bleed

22
Richer
nozzle

23
Richer

jet

24

Secondary
air

vent

pipe

into
the

engine
through
the
idle
hole

and

bypass
hole

Adoption
of
the

submerged

type
of

slow

jet
eliminates

such
hesitation
as

occurs
on
sudden
deceleration
of
the

vehicle

Slow
economizer

system
obtains

smooth
deceleration
at

high

speeds

Small

opening
of
the
throttle

valve

at

idling
or

partial
load

creates
a

large

vacuum

pressure
in
the
intake
mani

fld

By
this

vacuum

pressure
fuel
is

measured

through
the
slow

jet
located

behind
the
main

jet
And
air

coming

from
the
1st

slow
air

bleed
is
mixed

with

fuel
in
the

emulsion
hole

This
mixture
is

further
mixed
and

atomized
with
air

coming
from
the

2nd
slow
air

bleed
The
atomized

mixture
is

supplied
to
the

engine
from

EF15
25

Secondary
main
nozzle

26
Secondary
small
enturi

27
D
C
D
D
a

sembly

28

Secondary
throttle
valve

EF722

Fig
EF
25
Sectional
view

of
carburetor

the
idle
hole
and

bypass
hole
via
the

sow

sysem

passage

Accele

atlns
mechanism

The
carburetor
is

equipped
with
the

piston
type
accelerating
mechanism

linked
to
the

throttle
valve
When
the

primary
throttle
valve
shown
in

Figure
EF
26
is
closed
the

piston

goes
up
and

fuel
flows
from
the

float

chamber
through
the
inlet

valve
into

the

space
under
the

piston
When
the

throttle
valve
is

opened
the

piston

goes
down

opening
the
outlet
valve

and
fuel
is
forced

out
through
the

injector