reset DATSUN PICK-UP 1977 Service Manual

Ignition
Switch
Position
START

Detector
Drive
Counter

E

G
R

Warning
Lamp
ON

a
After

completing
inspection
of

E
G
R
control

system
be
sure
to

reset
odometer
of
detector
drive

counter
to
zero

b
This
item

applies
to
620
models

except
those
bound
for
California

and
Canada

3
With

engine
stopped

inspect

E
G
R
control
valve
for

any
indication

of

binding
or

sticking
by
movirig
dia

phragm
of
control
valve

upwards
with

fmgers
Engine
Tune

up

ON

Below

50

000
counts
Above

50
000
counts

OFF
ON

4
With

engine
running
inspect

E
G
R
control
valve
and
thermal

vacu

um
valve
for

normal

operation

I
When

engine
coolant

tempera

ture
is

low

Make
sure
that
E
G
R
control
valve

does

not

operate
when

engine
speed
is

increased
from

idling
to
3
000
to

3
500

rpm

Place

fingers
on
the

diaphragm
of

E
G

R
control
valve
to
check
for
valve

operation

2

When

engine
coolant

tempera

ture
is

high

I
Make
sure
that
E
G
R

control
valve

operates
when

engine

speed
is
in

creased
from

idling
to
3
000

to

3

500

rpm
Place

fingers
on
the

diaphragm
of
E

G
R

control
valve

to
check
for
valve

operation

2
If
E

G
R

control
valve
does
not

operate
check
as
follows

Disconnect
one
end
E
G
R
control

valve
side
ofvacuum
hose
connect

ing
thermal
vacuum
valve
to

E
G
R
EC253

Fig
ET
40

Checking
E
G
R
control
valve

control
valve

Increase

engine
speed
from

idling
to

3

000
to
3
500

rpm

Make
sure

that
thermal
vacuum

valve
is

open
and
that
carburetor

vacuum
is

present
at
the
end

E
G
R
control
valve

side
ofvacu

urn
hose

If
vacuum
is
weak
or
not

present
at

all

replace
thermal
vacuum
valve
If

vacuum
is

present
replace
E

G
R

con
trol
valve

ET
21
EC254

Fig
ET
41

Checking
thermal

vacuum

valw

If

any
difficulty
is
encountered
in

judging
the
condition
of

any

compo

nent

during
above

inspection
check

the

questionable
component
independ

ently
as

follows

E
G
R
control
valve

Dismount
E
G
R
control
valve

from

engine

I

Apply
vacuum
to
E
G
R
control

valve

referring
to
the

following
figure

If
the
valve
moves
to

full

position
it
is

normal

E
G
R
control

valve
will
remain

open
for

more
than
30

seconds
after

vacuum
has
cut
off

0

r11

hC

J

ET152

Fig
ET
42

Checking
E
G
R
control

VGlve

2

Visually
check
E
G
R
control

valve
for

damage
wrinkle
or
deforma

tion

3
Clean
the

seating
surface
of

E
G
R
control
valve
with

a
brush
and

compressed
air

and
remove

foreign

matter
from
around
the

valve
and

port

Engine
Mechanical

Connectlns
rod
be

rlns
undersize

SID

0
25
0
0098
Undersize

0
50
0
0197
Undersize

0
75
0
0295

Undersize

MISCELLANEOUS

COMPONENTS

CRANKSHA
AND

CAMSHA

SPROCKETS

I
Check
tooth
surface
for
flaws
or

wear

Replace
sprocket
if
fault
is

found

2
Install
camshaft

sprocket
in

posi

tion
and
check
for
rounout
If
it

exceeds
0
1

mm
0
0039
in

total

indicator

reading
repl
ce
camshaft

sprocket
Also
check

for
end

play

Camshaft
end

play

0
08

to
0
38

mm

0
0032
to

0
0150
in

EMl48

Fig
EM
71

Checking
eam

haft

sprocket
Tunaut
Unit
mm
in

Bearing
top
thickness
Crank

pin
diameter

1
493
to
1
506

0
0588
to
0
0593
49
961
to
49
974

1

9670
to
1

9675

49711
to

49
724

1
9571

to
1
9576
1

618
to
1

631

0
0637
to
0
0642

1

743
to
1

756

0
0686

to
0
0691
49461
to
49
474

1
9473

to
1
9478

1

868
to
1

881

0
0735
to
0

0741
49
211
to

49
224

1
9374
to
1
9379

Fig
EM
72

Checking

camshaft
end

play
3

Check
chain
for

damage
exces

sive

wear
or
stretch
at
roller
links

Replace
if

faulty

4
To

properly
adjust
chain
tension

or
valve

timing
camshaft

sprocket

has
a

earn

locating
plate
and
three

location
holes
Nos
I

2
and
3

Camshaft

sprocket
is

preset
at

No
I

hole
at
the

factory
If
chain

becomes
loose

adjust
it

by

setting

camshaft

sprocket
at
NO
2
hole
If

chain
is

too
loose

adjust
it

by

setting

camshaft

sprocket
at
No
3

hole

2

3

Before

adjustment
Location

match

3

After

adju5tmen
t

EM311

Fig
EM
73

Adjuating
camshaft
aprocket
location

EM
19

j

EC231

Thermal

vacuum
valva
o

o

m
Emission

Control

System

0

o

o

o

l

l
@

The
thermal
vacuum
valve

is

mounted
in

the

engine
thermostat

housing
It

detects

engine
coolan
t

tem

perature
by
means
of
a

built
in

bi

metal
and

opensor
closes
the

vacuum

passage
in
the

thermal
vacuum

valve

mt

li

t

00
t

EC232

Fig
EC
54
Thennal

vacuum
valve
To
E

G
R
control
valve

From
carburetor

1

Spring

2
Bi
metal

3

O

ring

E
G
R

warning

system

The

E
G
R

warning
system
install
1

Diaphragm
spring

2

Diaphragm

3
Valve
shaft

4

Valve

5
Valve

Seat

6
Valve
cham
ber

Fig
EC
53
E
G

R
control
value

When
the

vacuum

passage
is

open
the

carburetor
suction

vacuum
is

applied

to
the

diaphragm
of
the
E
G
R

con

trol
valve
to

actuate
the

taper
valve

connected
to
the

diaphragm

theconsiiiictlo

nlie
thermal

vacuum
valve
is

shown
below

ed

independently
of
the

E
G
R

con

trol

system
monitors

the
distance
the

car
has
travelled
and

indicates
when

EC
22
the
E

G
R

control

system
must
be

checked

The
E
G
R

warning
system
consists

of

an
odometer
switch

detector
drive

counter
E

G
R

warning

lamp
and

harnesses

When
the

earn
in
the

odom

eter
switch
connected
to

the

speed

ometer
turns

once
for

each
OAkm
4

mile
the

contact

point
of
the
elec

trica
circuit
closes

allowing
electric

current
to
flow

through
the

magnet

coil
of

the
detector

drive
counter

Thus

energized
the

magnet
coil
ac

Wates

the
latchet
to

turn
the
c
unter

wheel

by
one

pitch
When
the

number

of

counts
reaches
50
000
the
latchet

drops
in

a

groove
provided
on
the

periphery
of

the
counter
wheel
to

activate

the
detector

drive
counter

switch

Then
the

E
G
R

warning

lamp

comes
on

indicating
that
the
E
G
R

control

system
Should
be
checked

The

detector
drive

coun
teT
is

equip

ped
with
an
odometer
which

can
tell

when
to
service

the
E

G
R
contr0
I

system

After

completing

periodic
check

reset
the
odometer
to

zero
by
hand

proceeding
as
follows

1
Remove

grommet
installed
on

the
side

surface
of

detector
drive

counter
unit

2
insert

a
bar

or
a
screwdriver

tip

into
the

hole
from

which

grommet
has

been

removed
and

press
down
knob

provided
in

the
detector
drive
counter

for

resetting

The
E

G
R

warning

lamp
comes

on

under
the

following
circumstances

1
When
the
number
of

counts
has

reached
50
000
In
this

case
the

lamp

indicates
that
E

G
R

control

system

must
be
checked

2
When

operating
starter
motor

Notes

a
It
is

an
indication
of

problem
in

the

E

G
R

warning
lamp
or

problems

in
the

point
or
in
the
harnesses
if

the

lamp
does
not

light
at

50
000

counts

b

The
E

G
R

warning
system
is

mounted

on
all
620
models

except

those

bound
for
California
and

Canada

Ignition
Switch
Position
START

Detector
Drive

Counter

E
G
R

Warning
Lamp
ON

b
After

completing
inspection
of

E

G
R

control
system
be

sure
to

reset

odometer
of
detector
drive

counter
to

zero

c
This
item

applies
to
all
620
models

except
those
bound
for
California

and
Canada

3

With

engine
stopped
inspect

E
G
R
control
valve
for

any
indication

of

binding
or

sticking
by
moving
dia

phragm
of
control
valve

upwards
with

a

finger

2
When

engine
coolant

tempera

ture
is

high

I
Make

sure
that
E

G
R

control
valve

operates
when

engine
speed
is
in

creased
from
idling
to
3
000
to

3
500

rpm
Place
a

fmger
on
the

diaphragm
of
E
G
R
control

valve

to
check
for
valve

operation

2
If

E
G
R
control
valve
does
not

operate
check

as
follows

Disconnect
one
end
E

G
R
control

valve
side
of
vacuum
hose
connect

ing
thermal
vacuum
valve
to
E
G
R
Emission
Control

System

ON

Below

50
000
counts
Above

50
000
counts

OFF
ON

4
With

engine
running
inspect

E
G
R

control
valve
and
thermal
vacuo

um
valve
for
normal

operation

1
When

engine
coolant

tempera

ture

is
low

Make

sure
that
E
G
R

control
valve

does
not

operate
when

engine
speed
is

increased
from

idling
to
3
000
to

3
500

rpm

Place
a

fmger
on
the

diaphragm
of

E
G
R
control
valve
to

check
for
valve

operation

EC253

Fig
EC
62

Checking
E
G
R
control
valve

control
valve

Increase

engine
speed
from

idling
to

3
000
to
3

500

rpm

Make
su
re
that
thermal
vacu
um

valve
is

open
and
that

carburetor

vacuum
is

present
at
the
end

E

G
R
control

valve
side
of

vacu

um
hose

If
vacuum
is
weak
or

not

present
at

all

replace
thermal
vacuum
valve
If

vacuum
is

present
replace
E
G

R

control
valve

EC
25
EC254

Fig
EC

63

Checking
lhermal

vacuum
valve

If

any
difficulty
is
encountered
in

judging
the
condition
of

any

compo

nent

during
above

inspection
check

the

questionable
component
independ

ently
as

follows

E
G
R

control
valve

Dismount
E

G
R

control
valve

from

engine

I

Apply
vacuum
to

E
G
R

control

valve

referring
to
the

following
figure

If

the
valve

moves
to
full

position
it
is

normal

E
G
R

control
valve
will
remain

open
for
more

than
30

seconds
after

vacuum
has
cut

off

la

ET152

Fig
EC
64

Checking
E
G
R

control

ualue

2

Visually
check
E
G
R

control

valve
for

damage
wrinkle
or
defonna

tion

3

Clean
the

seating
surface
of

E
G
R
control
valve
with
a
brush

and

compressed
air

and
remove

foreign

matter
from
around
the
valve
and

port

DESCRIPTION

INSPECTION

CLEANING
AND
REGAP

DESCRIPTION

The

spark
plugs
are
of
the

conven

tional

type
having
14
mm
0

551
in

threads
The

spark
plug
gaps
are
1
0
to

1
1
mm
0
039
to
0
043
in
on
Cali

fomia
models
and
0
8

to
0
9
mm

0
031
to

0
035
in
on
non
California

models
The

inspection
and

cleaning

should
be
made
every
suitable
mainte

nance

period
If
necessary
replace

Note
All

spark

plugs
installed
on
an

engine
must
be

of
the
same
brand

and
the

same
number
of
heat

range

INSPECTION

L
Remove

spark
plug
wire

by

pulling
on

boot
not
on
wire
itself

2
Remove

spark
plugs

3

Check
electrodes
and
inner

and

outer

porcelains
of

plugs
noting
the

type
of

deposits
and
the

degree
of

electrode
erosion

Refer
to

Figure

EE
96

Normal
Brown
to

grayish
tan
de

posits
and

slight
electrode
wear

indicate
correct

spark
plug
heat

range

Carbon
fouled

Dry
fluffy
carbon

deposits
on
the
insulator
and

electrode
are

usually
caused

by

slow
speed
driving
in

city
weak

ignition
too
rich
fuel
mixture

dirty
air
cleaner
etc

It
is

advisable
to

replace
with

plugs

having
hotter
heat

range

Oil
fouled
Wet
black

deposits
indi

cate
excessive
oil
entrance
into

combustion
chamber

through
worn

rings
and

pistons
or
excessive
clear

ance
between
valve

guides
and

stems
If
the
same
condition
re

mains
after

repair
use
a
hotter

plug
Engine
Electrical

System

SPARK
PLUG

CONTENTS

EE
4B

EE
47

EE
47

EE
47
SERVICE
DATA
AND
SPECIFICATIONS

TROUBLE
DIAGNOSES
AND

CORRECTIONS
EE
4B

Overheating
White
or

light

gray
in

sulator
with
black
or

gray
brown

spots
and
bluish
burnt
electrodes

indicate

engine
overheating
More

over
the

appearance
results
from

incorrect

ignition
timing
loose

Normal

Overheating

EE079

4
After
cleaning
dress
electrodes

with
a
smaU
fine
file
to
flatten
the

surfaces
of
both
center
and
side

electwdes
in

parallel
Set

spark
plug

gap
to

specification

5
InstaU

spark
plugs
and

torque

each

plug
to
L5

to
2
0

kg
m

11
to
14

ft
Ib

6
Connect

spark

plug
wires

CLEANING

AND
REGAP

Clean

spark
plugs
in

a
sand
blast

type
cleaner
Avoid
excessive

blasting

Clean
and
remove
carbon
or
oxide

deposits
but
do
not

wear
away

porcelain
If

deposits
are
too
stubborn

EE
47
spark
plugs
low
fuel

pump
pres

sure

wrong
selection
of
fuel
a

hotter

plug
etc

It
is
advisable
to

replace
with

plugs

having
colder
heat

range

Ir

i

Carbon
fould

Worn

Fig
EE
96

Spark
plug

discard

plugs

After

cleaning
spark
plugs
renew

firing
surface
of
electrodes
with
me

mentioned
aboVe
Then

gap
spark

plugs
to

specified
values
with
a
round

wire
feeler

gauge
All

spark
plugs
new

or
used
should
have
the

gap
checked

and
reset

by
bending
ground
electrode

EEOBO

Fig
EE
97

Setting
park
plug
gap