1977 DATSUN PICK-UP tire pressure

Condition

ENGINE
POWER
NOT

UP
TO
NORMAL

Low
compression

Ignition
system
out
of

order

Fuel

system
out

of

order

Air
intake

system
out

of
order

Emission
control

Overheating

O

cooIing

Others
Engine
Tune

up

Probable
cause

Incorrect

iSnition
timing

Damaged

spark
plugs

Worn
distributor

points

Malfunction
of
choke

system

Clogged
fuel

pipe
or

floating
valve

Dirty
or

clogged
fuel
strainer

Fuel

pump
will
not
work

properly

C10ssed
carburetor

jets

Malfunction
of
altitude

compensator

CIOJBed
air
cleaner

Ail

inhaling
from
manifold

gasket
or

carburetor

gasket

Malfunction
of

E
G
R
valve

Stick
E
F
E

valve
shaft

Insufficient
coolant

Loose
fan
belt

Worn
or
oiled
fan
belt

Inoperative
thermostat

Worn
water

pump

Clogged
or

leaky
radiator

Worn
radiator
filler

cap

Ail

in

cooling
system

Improper
engine
oil

grade

Incorrect

ignition
timing

Clossed
carburetor
lean
mixture

Disconnected
altitude

compensator
hOlle

Inoperative
thermostat

Improper
octane
fuel

L

j
tire

pressure

Dragging
brake

Clutch

slipping

ET

30
Corrective
action

Previously
mentioned

Adjust

Clean

adjust
or

replace
plull

Dress

or

replace
points
Also
check

condenser

Adj
lst

Clean

Replace

Repair
or

replace

Disassemble
and
clean

Check
and

replace

Replace
element

Replace
gasket

Check
and
replace

Repair

Replenish

Adjust
fan
belt

Replace

Replace

Replace

Flush

repair
or

replace

Replace

Retighten
each

part
of

cooling
system

Replace
with

proper
grade
oil

Adjust

Overhaul
carburetor

Connect

Replace

Replace
with

specified
octane
fuel

Inflate

to

specified

pressure

Adjust

Adjust

Except
transistor

ignition
system

ENGINE
LUBRI
CATION
SYSTEM

Note

Pump
rotors
and

body
are
not

serviced

separately
If

pump
rotors

or
body
are

damaged
or
worn

replacement
of
the
entire
oil

pump

assembly
is

necessary

Tightening
torque

Oil

pump
mounting
bolts

Oil

pump
cover
bolts

Regulator
valve

cap
nut

Specifications

Oil

pressure
at

idling

Regulator
valve

spring

Free

length

Pressured

length

Regulator
valve

opening
pressure

OIL
FILTER

The
oil
filter
is
a

cartridge
type

The
oil
filter
element
should
be
reo

placed
periodically
with

the
use
of
Oil

Filter
Wrench
ST19320000

When

installing
an
oil
filter
fasten

it
to

cylinder
block

by
hand

Note
Do
not

overtighten
filter
or
oil

leakage
may
occur
OIL
PRESSURE

REGULATOR
VALVE

The
oil

pressure
regulator
valve
is

not

adjustable
At
the
released

position
the
valve

permits
the
oil

to

by
pass
through
the

passage
in

the

pump
cover
to
the
inlet
side
of
the

pump
Check

regulator
valve

spring
to

ensure
that

spring
tension
is

correct

kg
m
ft
Ib

kg
m
ft
lb

kg
m
ft
lb

kg
cm2

psi

mm
in

mm
in

kg
em
2

psi

RELIEF

VALVE

The
relief
valve
located
at
the

center

portion
securing
oil
fIlter
to

the

cylinder
block

by

passes
the
oil

into
the
main

gallery
when
the
oil

fIlter
element
is

excessively

clogged

STl9320000

EL015

Fig
EL
9

Removing
oil

filter

EL
4
EL014

Fig
EL
B

Regulator
value

l
l

to
1
5
8
0
to
11

0
7
to

1
0
5
Ito
7
2

4

to
5
29
to
36

0
8
to
2
8

II
to
40

52
5
2
067

34
8

1
370

35
to
5
0
50
to
71

With
oil
fIlter
removed
check

valve
unit
for

operation
Inspect
for
a

cracked
or
broken
valve
If

replace

ment
is

necessary
remove
valve

by

prying
it

out
with
a
screwdriver

Install
a
new
valve
in

place
by

tapping
it

EL016

Fig
EL
JO
Relief
lJOlue

WHEEL
ALIGNMENT

Correct
front
wheel

alignment

attains

proper
vehicle

handling
charac

teristics
and
the
least

steering
effort

with
a
minimum
amount
of
tire
wear

Before

adjusting
front
wheel

align

ment
make
sure
to

carry
out
a

pre

liminary
inspection
of
the
front
end

parts
for
the

following
conditions

1
Tire

pressure
and

balance

2
Wheel

bearings
and
nuts

3

Steering

gear
play

4

Steering
gear

housing
at
frame

S

Steering
linkage
and
connections

6
Shock
absorber
action

When

using
the

equipment
for
front

wheel

alignment
inspection
follow
the

inst

c
tions
furnished

with
the

equip

ment
Furthennore
the

inspection

should
be
made
with
the

vehicle
level

and
at

curb

weight

Camber
and

caster

Measure
camber
and
caster

and

adjust
them
in

accordance
with

the

following
procedures
if

necessary

Both
camber
and
caster

are
ad

justed
by
increasing
and

decreasing

thickness

of

adjust
shim

inserted
be

tween

upper
link

spindle
and

upper

link

mounting
bracket

To

adjust
caster

make
a

difference

between

thickness
of
front

and
rear

shims

By

adding
a
shim

I
mm
0

039

in

at
front
side

caster
will
be
de

creased

by
33

At
the

same
time

camber

will
also
be

decreased

by
6
S

To

adjust
camber
add
or
remove
an

equal
amount
of

shims
to
front

and

rear
sides

By

adding
a

pack
of
shims
I

mOl
0
039
in

thick
at
both

sides

camber

will

be
decreased

by
13

Shims

are
available
in
I

mm
0
039

in
2

mOl
0
079
in
and
4

mOl
0
157

in

thickness
Front
Axle
Front

Suspension

FA243

Fig
FA

25

Adjustingcamberand

cCJ
ter

Notes

a
Do
not
make
difference

between

front

and
rear
shims

in
thickness

beyond
2
mm

0
079
in
on
a

upper

link

spindle

b

Umit
shim
thickness
for

anyone

stack
within
6

nun
0

236
in

c
Do
not

use
shims
for

anyone
stack

more
the
2

sheets

Toe
in

Measure
toe
in

and

adjust
if
neces

sary
For

adjustment
carry
out
the

follOWIng
procedures

Turn

steering
wheel
to

straight

ahead

position
with
front
wheels
in

the
same

position
Then
check

steer

ing
gear
straight
ahead

position

Loosen
lock
nuts

@
left
hand

thread
and

ID
right
hand
thread

and
turn
cross
rod

CD
to

adjust
toe
in

Turn

cross
rod
to
forward

direction
as

shown

by
arrow
and
toe
in
is

reduced
When

cross
rod
is
turned
to

opposite

side
toe
in
is
increased

After

correct
toe
in
is

obtained

tighten
lock
nut

to
8

0
to
10

0

kg
m

S8
to

72
ft
Ib

r
J

r

CD

0

HI

r
I

e

f

FA244

Fig
FA

26

Adju6ting
toe
in

STEERING
ANGLE

Check

steering
angle
and
use
the

follow

ng
procedures
if

necessary

Loosen
lock
nut
at

stopper
bolt
and

adjust
steering
angle
with

stopper
bolt

Mter

obtaining
correct

steering

angle

secure
lock
nut

firmly

FA245

Fig
FA

27

Adjusting
steering
angle

Model
Item

All

models

mOl
in
1
2
to
3
0
079
to

0
118

Toe
in

degree
2

10
to
16

Camber

lOIS
Io

Caster
10SO

4S

I
60IS

Kingpin
inc

inal10n

I
Inner
wheel

360
10

Steering
angle

I
Outer
wheel

310
10

1
The

extreme
front
and

rear
of
the
tire

center

Unladen

2
The
total

angle
of

the
both
tires

FA
12

Front
Axle
Front

Suspension

TROUBLE
DIAGNOSES
AND
CORRECTIONS

Condition

Vibration
shock
and

shimmy

ing
of

steering
wheeL

Vehicle

pulls
to
right
or
left
Probable
cause

Vibration
Too

much
backlash
of

steering

gear
wear

of
each

part
of

linkage
and
vibration
of
front

wheels
are
in

many
cases
transmitted
to
the

steering
wheel
This
is

Very
much
noticeable
when

traveJling
over
bad
roads
and
at

higher

speeds

Shock
When

the
front
wheels
are

travelling
over

bumpy
roads
the

play
of
the

steering
linkage
is

transmitted
to
the

steering
wheel
This
is

especially

noticeable
when

travelling
rough
road

Shimmy
Abnormal
vibrations
of
the
front

suspen

sion

group
and
the
whole

steering

linkage
which

occur
when

a

specific
speed
is
attained

Improper
air

pressure
of
tire

Unbalance
and
deformation
of
roadwheel

Unevenly
worn
tire
or

insufficient
tightening

Improperly
adjusted
or

worn
front
wheel

bearing

Faulty
wheel

alignment

Worn
or
loose

suspension
link
screw

bushing

Damaged
idler
arm

Insufficiently

tightened
steering
gear
housing

Worn

steering
linkage

Improper
steering
gear
adjustment
insufficient
back

lash

Faulty
shock
absorber
or
loose
installation

Unbalanced
vehicle

posture

When

driving
with
hands
off
the

steering
wheel

on
a

fiat
road
the
vehicle

gently
swerves
to

right
or

left

Note
A

faulty
rear

suspension
may
also
be
the
cause

of
this
condition
and
therefore
see
also
the

chapter
dealing
with
the
rear

suspension

Improper
air

pressure
of
tire

or
insufficient

tightening

of
wheel
nu
ts

Difference
in

height
of

right
and
left
tire
treads

Incorrect

adjustment
or
abrasion
of
front
wheel

bearing

Weakened
front
torsion

spring
or
deviation
from

standard

specification

Improper
wheel

alignment

Worn

or
loose

suspension
link

screw

bushing

FA
14
Corrective
action

Adjust

Correct
the
unbalance

or
re

place

Replace
or
tighten

Adjust
or

replace

Adjust

Replace

Replace

TIghten

Replace
ball

joint

Adjust

Replace
or

tighten

Adjust

Adjust
or

tighten

Replace
tires

Adjust
or

replace

Replace

Readjust

Replace

Condition

Vehicle

puBes
to

right
or
left

Instability
of
vehicle

Stiff

steeirng
wheel

Excessive

steering
wheel

play

Noise
Front
Axle

Front

Suspension

Probable
cause

Deformed
of

steering

linkage
and

suspension
link

Unbalanced

vehicle
level

Improper
air

pressure
of
tire

Worn
or

loose

suspension
link
screw

bushing

Incorrect
wheel

alignment

Worn
or
deformed

steering

linkage
and

suspension

link

Incorrect

adjustment
of

steering
gear

Deformed
unbalanced
wheel

Check

and
correct
in
the

following
manner

Jack

up
front

wheels
detach
the

steering
gear
and

operate
the

steering
wheel
and

a

If
it
is

light
check

steering
linkage
and

suspension

groups

b
If
it
is

heavy
check

steering

gear
and

steering

column

groups

Improper
air

pressure
of
tire

Insufficient
lubricants
or

mixing
impurities
in

steering

linkage
or

excessively
worn

steering

linkage

Insufficient
lubricant
in

gear
box
or
contaminated

lubricant

Unsmooth

king
pin
damaged
part
Or
insufficient

lubrication

Worn

or

incorrectly
adjusted
wheel

bearing

Worn

damaged

steering
gear
and

bearing

Incorrectly
adjusted

steering
gear

Deformed

steering
linkage

Incorrect
wheel

alignment

Interference
of

steering
column
with
turn

signal

switch

Incorrectly
adjusted
steering
gear

Worn

steering
linkage
idler

arm

Improperly
fitted
of

gear
box

Incorrectly
adjusted
wheel

bearing

Worn
or
loose

suspension
link

screw
bushing

Improper
air

pressure
of
tire

Insufficient

lubricating
oil
and

grease
for

suspension

link
screw

bushing
and

steering
linkage
or
their

breakage

FA

15
Corrective
action

Replace

Correct

the
unbalance

Adjust

Replace

Adjust

Replace

Adjust

Correct

or

replace

Adjust

Replenish
grease
or

replace

the

part

Add

or

replace
gear
oil

Replace

Replace
or

adjust

Replace

Adjust

Replace

Adjust

Adjust

Adjust

Replace

Retighten

Adjust

Replace

Adjust

Replenish
lubricating
oil
and

grease
or

replace

Condition

Noise

Grating
tire
noise

Jumping
of

disc
wheeL

Excessively
or

partially
worn

tire
Front
Axle
Front

Suspension

Probable
cause

Loose

steering
gear
bolts

linkage
and

suspension

groups

Faulty
shock
absorber

Damaged
wheel

bearing

Worn

steering
linkage
and

steering
gear

Worn
of
loose

suspension
link
screw

bushing

Improper
air

pressure
of
lire

Incorrect
wheel

alignment

Deformed
knuckle

spindle
and

suspension
linkage

Rough
driving

Improper
air

pressure
of
tire

Unbalanced
wheels

Faulty
shock
absorber

Worn
tire

Deformed
wheel
rim

Improper
air

pressure
of
tire

Incorrect
wheel

alignment

Damaged
wheel

bearing

Incorrect
brake

adjustment

Improper
tire

shifting
rotation

Rough
and

improper
wiving
manner

FA
16
Corrective
action

Retighten

Replace

Replace

Replace

Replace

Adjust

Adjust

Replace

Avoid

rough
driving

Adjust

Adjust

Replace

Replace

Replace

Adjust

Adjust

Replace

Adjust

Adjust

Drive
more

gently

Condition

Brake
chatters

Brake

squeals

Pedal

pulsates

Brakes
fade

Brakes

drag

Unbalanced
brakes
Brake

System

Probable
cause

Groove

or
out
of

round
brake
drum

Loose

or
bent

brake

disc

Distorted
brake
shoes

or

pads

Grease
or
brake
fluid
on

linings

Dirty
or
scored
brake

drums

Distorted
brake
shoes
or
bent

support
plate

Weak
or
broken
brake
shoe

retaining
spring

or

return

spring

Glazed
or
contaminated
brake

lining

Out
of

round
or
off
center
drum

Brake
fluid
has
too
low

boiling
point

Use
of

improper
linings
or
brake

linings
are

contaminated

Brake
drums
are
out
of
round

Hydraulic
connections
master

cylinder
and

wheel

cylinders
are

corroded
or

damaged

Bleed
screw
is

open

Pedal

linkage
is

binding
or

push
rod

adjust

ment
is
too

long

Master

cylinder
compensator
part
is
ob

structed

Seized
master

cylinder
piston

Poor
shoe
condition

Poor

wheel
cylinder
condition

Deformation
of

piston
cups

Hand
brake
will
not
return

Clogged
master

cylinder
return

port

Improper
tire
inflation

Improper
adjustment
of
shoe

to
drum
clear

anee

Grease
oil
mud
or
water
on

linings
or

pads

Mud
in

brake
drum

Deterioration
of

linings
or

pads

Excessive
wear
of

linings
or

pads

BR
23
Corrective
action

Grind
or

replace
as

required

Tighten

support
plate
bolts
to

specified

torque
or

replace
plate

Replace
as

necessary

Replace
linings

Blowout

assembly
with

compressed
air
or

refinish
drum

Replace
faulty
unit

Replace
if

faulty

Cam

ground
lining
to
eliminate

glaze
If

it

doesn
t

replace
linings

Turn

drum
or

replace
as
necessary

Drain
and
fill

system
with

approved
fluid

Replace
linings

Repair
or

replace
as
necessary

Repair
as
necessary

Close
screw
and
bleed

system

Lubricate

linkage
check

pedal
return

spring

for
condition
and

adjust
push
rod

as
neces

sary

Blowout

foreign
matter
with

compressed

air

Disassemble
master

cylinder
and

replace

piston
Bleed

system

Clean
and

repair

Repair
or

replace

Replace

Check
and

repair

Clean

Inflate
to
correct

pressure

Readjust

Clean
brake

mechanism
and
check
for
cause

of

problem
Replace
linings
or

pads

Clean

Replace

Replace

DESCRIPTION

MAINTENANCE
AND
SERVICE

TIRE
INFLATION

TIRE
REPAIR

WHEEL
REPAIR

WEAR

DESCRIPTION

The

620
series
models
are

equipped

with

4lV
14

wheels
with
25

mOl
0
98

in

offset
All
tires

are
tubeless
Wheel

and
Tire

WHEEL
AND

TIRE

CONTENTS

WT2

WT
2

WT2

WT2

WT
2

WT
2
TIRE

ROTATION

CHANGING
TIRE

INSPECTION

WHEEL

BALANCE

WHEEL
AND

TIRE

Tire
size

Model
Tire
size
Wheel
size

All

models
6

00
I
4
6PR

Tubeless
4UJ
14

Tire

pressure

Unit

kgl
em
2

psi

Vehicle

speed
km
h

MPH
Under

Over

100
km
h
100
km
h

Model

60

MPH
60
MPH

Front

1
5
21
1
8

26

Unloaded

Rear
175

25
2
25
32

All

models

Front

1
5

21
1

8
26

Loaded

Rear
3
0

42
3
15
4S

Note
Tire
inflation

pressures
should

be
measured

when
tires
are
cold

MAINTENANCE
AND

SERVICE

TIRE

INFLATION

Correct
tire

pressure
is

very
im

portant
to
ease
of

steering
and

riding

comfort

This
also
reduces

driving

sound

to
a
minimum

resulting
in

longer
tire

life
that
is

overinflation
or
underinflation

promotes
wear
at

cen

ter
tread
or

shouider
of
tire

If

aU
tires
are

inspected
frequently

and
maintained

correct
tire

pressure
it

is

possible
to

detect

sharp
material

in

the
tread

Also
the
above
check

avoids

abnormal
wear
which
invites
serious

problem
If
tires
indicate

abnormal
or

uneven

wear
the
cause
of

problem

should
be
detected
and
eliminated

After

inflating
tires

leakage
in
valve

should
be

checked
Without

valve

caps

leakage
will

occur
due
to

dirt
and

water

resulting
in

underinflation
Ac

cordingly
whenever
tire

pressure
is

checked
be
sure
to

tighten
valve

caps

firmly
by
hand

WT
2
WT3

WT3

WTA

WTA

WT
4

TIRE
REPAIR

In
order

to

inspect
a
leak

apply

soapy
solution
to
tire
or

submerge
tire

and
wheei

in
the

water
after

inflating

tire
to

specified

pressure
Special
in

spection
for

leaks
should
be
carried

out
around
the
valve
wheel
rim
and

along
the
tread

Exercise
care
to
bead

and
rim
where

leakage
occurs

Wipe

out
water
from

area
which

leaks
air

bubbles
and

then
mark
the

place
with

chalk

After

removing
the
materials
which

caused

puncture
seal
the

point
When

repairing
the

puncture
use
the

tire

repair
kits

which
are
furnished
from

tire
dealers

following
the
instructions

provided
with
the

kits
In

case
that
a

puncture
becomes

large
or
there
is

any

other

damage
on
the

tire
fabric

repair

must
be

carried
out

by
authorized

tire

dealers

WHEEL
REPAIR

Inspect
the
wheel
rim

flange
for

bend

or
dents

The

flange
should
be
cleaned

by
a

wire

brush
when
rust
is
found

on
the

flange
Furthermore
if
excessive

pitting
occurs

on
the

rim
eliminate
it

with
a
file

WEAR

Missilgnment

When
the
front
wheels

align
in

excessive
toe
in
or

toe
out
condition

tires

scrape
the

tread
rubber
off
The

wear
of
tread

appears
feathered

edge