1968 DATSUN 510 tire pressure

CHAPTER
TWO

PERIODIC
MAINTENANCE

To
ensure

good
performance
dependability

and

safety
regular
penodlc
maintenance
is

necessary
TIns

chapter
outlInes
routine

and

penodlc
mamtenance
for
the

average
dnver

Under

heavy
usage
semcmg
mtervals
will
be

shortened

Regular
routme
mamtenance
will

help
aVOId

expensive
repaIrs

ROUTINE
CHECKS

The

followlDg
checks
should
be

performed
at

each
fuel

stop

1
Check

engme
oil
level

Top
up
as

requrred

2
Check
radiator
coolant
level

Top
up
as
re

qwred

3
Check

battery
electrolyte
The

battery
case

IS
marked
With

upper
hrmt
and
lower
lnmt
lInes

Level
should
be
maID
tamed

between
the
IIDes

4
Check
that
the
master

cylInder
brake
flwd

reservOir
level
IS
between
the
max
and
mm

lInes
marked
on
the

plastic
case

S

Check
the

plastic
clutch

cyhnder
reservoir

level
Level
should
be
between
the
max
and

mm
lInes

6
Check
the
windsh1eld
washer
flwd
reservoir

Top
up
as

required
7
Check
tire

pressures
when
the
tIres
are
cold

Front
and
rear
tire

pressures
should
be
24

pounds
under
normal

dnving
conditions
TIre

pressure
should
be
28

pounds
for

h1gh
speed

dnvmg
conditions

8
Check
the

engIne
for

general
conditIon

Check
for

leaky
or
cracked
hoses
and
loose

wmng

9
Check
condition
of
wmdshleld

wiper
blades

PERIODIC
CHECKS

Table

1

prOVIdes
penodIc
checks
and
main

tenance
that
should
be

performed
on
a
set

schedule
Table
2

gIves
recommended
lubncants

and
Table
3

specIfies
the

grades
of
oil
that
should

be
used
Procedures
for

performmg
the
semces

are

presented
ID
vanous

chapters
of
tlus
manual

Table
3
RECOMMENDED
GRADES
OF
OIL

Temperature
Engine
on

MS

Above
32
C
90

F
average
SAE
30
IOW
30

32
to
0
C
90

to
32

F
mlmmum
SAE
20
20W
IOW
30

O
to
12
C
32
tolO

F
mlRlmum
SAE
IOW
IOW
30

Below
12
C
10
F
mlmmum
SAE
lOW
IOW
30

16

CHAPTER

TIlREE

sary
Also
check
all

parts
for

mlSaltgnment
and

uneven
wear

TRANSMISSION

1

Difficult
to
mesh

gears

Make
certam
the

clutch

pressure
plate
and
re

lease

beanng
are
m

good
condItion
The
trouble

can
be

caused

by
worn

gears
shaft
and
or
bear

mgs
DISassemble
and

repaIr
as

requIred
Also

can
be
caused

by
msufficlent

operatmg
stroke

due

to
worn
or
loose

sltdmg
parts
or
a
defective

synchronIZer
DIsassemble

carefully

InSpect
and

replace
as

requIred

2
Gears

slip
out

of
mesh

Generally
thIS
trouble
occurs
when

the
mterlock

plunger
check
ball
and

or

spnng
IS
weakened

or
worn
The
trouble
can

also
be
caused

by
worn

fork
rod
ball

groove

damaged

bearings
or
dam

aged

gears
DIsassemble

carefully
mspect
and

replace
as

required

3
NOIse

If
nOISes
are
heard

wIth
the

engme
idlmg
and
the

clutch

disengaged
the
nOIse
IS

probably

conung

from
the

transmISSIOn
Several
Items

can
cause

nOISes

either

smgly
or
m
combmatIon

Check
the

qualIty
and

quantity
of
lubrIcant

in
the
trans

mISSIon

Replace
or

replenISh
as

necessary
Worn

bearIngs
wIll

usually
produce
a

lugh
humming
at

hIgh
speed
and

a

cycltc
knockIng
sound
at
low

speed
Worn

or

damaged
splInes
and

bushmgs

will
also
cause

nOIse

BRAKES

1
Brake

pedal

goes
to

floor

There

are
numerous
causes
for
thIS

includIng

excessIvely
worn

Itnmgs
aIr
in
the

hydraultc

sys

tem

leaky
brake
lmes

leaky
wheel

cylmders
or

leaky
or
worn

master

cylmder
Check
for
leaks

and
thIn
brake

linmgs
Bleed
and

adjust
the

brakes
If

thIS
doesn
t
cure
the
trouble

rebwld

wheel

cylmders
a
nd
or
master

cylmder

2

Spongy

pedal

Normally
caused

by
aIr
m
the

system
blee
d
and

adjust
the
brakes

3

Brakes

pull

Check

brake

adjustment
Also
check
for
contam
inated

brake

Itmngs
from
leaks

leaky
wheel

cyltnders
loose

caltpers
frozen

or
seIZed

pIstons

and
restrIcted
brake
lmes

or
hoses
In
addItion

check
front
end

alignment
and

suspensIOn
dam

age
such
as
broken
front

or
rear

sprmgs
shocks

etc
Check
condItIon

of
tIres

4
Brakes

squeal
or
chatter

Check
brake

lmmg
thickness

and
brake
drum

roundness
Ensure

that
the
shoes
have
cham

ferred
ends

and
are
not
loose

Inspect
the
condI

tion
of

the
rotors
on
the
front
wheel
dISC

brakes

to
make

certain

they
are
not
scored

or

damaged

Clean

away
all
dIrt
on
shoes

pads
rotors

or

drums

5

Draggmg
brakes

Check

brake

adjustment
includmg
handbrake

Check
for
broken
or

weak
shoe
return

springs

swollen
rubber

parts
due
to

unproper
brake
flUId

or
other
contammatIon

Clean
or

replace
de

fectIve

parts

6
Hard

pedal

Check
brake

linmgs
for

contammation
Also

check
for

restrIcted
brake
lines

and
hoses

7

High
speed
fade

Check

for
dIstorted
or
out
of
round
drums

and

contamInated
brake

lmmgs
Make

certam
the

recommended
brake
flUId
IS

used
Dram
entIre

system
and
refill
If
In
doubt

8

Pulsatmg
pedal

Check
for
dIStorted
or
out
of
round
drums

or

rotors
Check
for

excessIVe
brake

dISC
run
out

STEERING
AND

SUSPENSION

NOTE
Unusual

steermg
pullmg
or

wandermg
IS

usually
caused

by
bent

or
otherwise

mIsaligned

suspenszon

parts
Because

of
the

speCialized
equIp

ment

reqUired
to
evaluate
and

correct

these

faults
It
IS
recommended

t
tat

servIce
to

the

steermg
and

suspension

system
be

referred
to

your
Datsun

dealer

oca

quallfied
specrallst
m

thiS

field

1
VibratIOn

felt
m

steermg
wheel

VIbratIon
can
be
caused

by
several

thmgs
includ

ing
lll1proper
aIr

pressure
m
tIres

uneven
wear

TROUBLESHOOTING
17

of
tIre
loose
wheels

unproper
adjustment
or

wear
of
front
wheel

bearIngs
faulty
wheel

align

ment
or
wear
of
transverse
lInk
and
tension
rod

bushings
Inspect
all

parts
carefully
for
wear
or

damage

Replace
or

replUI
parts
as

required

2
Shock

transmltled

through
steering
wheel

This
is

usually
most
noticeable
when

traveling

over
bad
roads
at

relatively
high
speeds
Causes

Include

damage
to
the
idler
ann
insuffiCient

tIghtening
of

steenng
gear
box
wear
of
the
steer

Ing
linkage
and
wear
of
the

suspension
ball

joint

Inspect
all

parts
for
wear
or

damage
Refer
to

Chapter
ThIrteen
for
service
or

repair
you
can

perform
and
for

procedures
which
should
be

referred
to

your
deal
r

3

Shlmmymg

This
is

usually
most
noticeable
when
a

specIfic

speed
IS
attained
and
will

normally
repeat
at
that

speed
Causes
are

generally
unbalanced
wheels

unproper
adjustment
of

steenng
gear
insuffi

cient
backlash
malfunction
of
the
shock
ab

sorbers
or
loose
bolts
for
the
strut

mountIng

Reparr
or

replace
defective

parts
as

required

Refer
to

Chapter
Thirteen

4

Wandermg
of
car
m
one
dlrectlOnl

This

problem
can
be
caused

by
improper
air

pressure
loose
wheel

nuts
difference
in
tire
tread

wear
from
left

to

right
side
Incorrect

adjustment

of
wheel

bearings
defectIve
wheel

beanngs

collapsing
or

twistIng
of
front

spnng
or
Incorrect

wheel

alignment
Also

binding
of
the
brake

shoes
worn

bushings
in
the
transverse
link
or
the

tension
rod
and
deformation
of
s

enng

lInkage

and

suspension
link
can
cause
wander

Carefully

iuspect
all

parts
for
looseness
and
wear
and
re

place
or

repaIr
as

required
In
some
c
ases
a
de

fective
rear

suspension
may
also
cause
the

vehicle
to
wander

5

InstabIlity

Instability
can

be
caused

by
unproper
tIre

pres

sures
worn

bushings
in
the
transverse
link
and

tension
rod
mcorrect
wheel

alignment
worn

steenng
linkage
Incorrect

adjustment
of
steer

ing
gear
and
unbalanced
wheels

Inspect
all

parts
carefully
for
wear
and

damage
Adjust

repair
or

replace
as

required
6

Heavy
feelmg
m

steering

This
can
be
caused

by
improper
tIre

pressures

insuffiCient
or
contamInated
lubncant
in

gear

box

damage
or
insuffiCient

grease
In

suspeuslon

ball

Joint
damaged
or

badly
adjusted
wheel

bearIngs
worn
or

damaged
steermg
gear
dam

age
of

upper
strut

bearing
and
mterference
of

steenng
column
With
turn

signal
SWitch

Inspect

all

parts
carefully
for
wear
and

damage
Adjust

repair
or

replace
as

required

7
ExceSSIve

play
m

steermg
wheel

This
is

usually
caused

by
Incorrect

adjustment
of

the

steenng
gear
worn

bushings
in
the

steering

linkage
or
Idler
arm
mcorrect

adjustment
of
the

front
wheel

bearings
worn

bushIngs
in
the
trans

verse
lInk
and
tension
rod

Carefully
inspect
all

parts
for
wear
or

damage
Adjust
repair
or
re

place
as

reqUIred

TIRE
WEAR
ANALYSIS

Abnormal
tIre
wear
should

always
be
ana

lyzed
to
deternune
the

cause
The
most
common

are
Incorrect
tIre

pressure
improper
dnving

overloading
and

Incorrect
wheel

ahgDment

Figures
2A

through
2F

identify
wear

patterns

and
mdicate

likely
causes

Of

I

1

l

D

1

Undennflatlon
Worn
more
on
Sides
than
In

center

COOLING
SYSTEM
8S

and

In
those
with
exhaust
and

evaporatIve
emIS

sion
control
devIces
a
fan
clutch
IS
combIned

WIth
the
thermostat
to
detect

temperature
m
the

engme
compartlnent
When
the

temperature

nses
the
thermostat
detects
the

change
an
the

fan
clutch

engages
thereby
helpmg
to
cool
the

engme

WATER
PUMP

Figure
2

page
86
IS
an

exploded
drawmg
of

the
water

pump
and
fan

assembly
for
1970
to

1971
The

top
half
of
the
IllustratIon

applIes
to

those
models
WIth
exhaust
and

evaporatIve

emiSSIOn
control

systems
The
bottom
half
covers

models
WIth
a
crankcase

emiSSIon
control
deVIce

only

Figure
3

page
87

IS
an

exploded
drawmg
of

the
water

pump
and
fan

assembly
for
1968

models
Without
exhaust

or

evaporatIve
controls

Figure
4

page
88
shows
the
1968
model
With

emISSIon
control
deVIce
As

can
be
seen
from
the

illustratIons
most
dIfferences
eXISt
withIn
the

fan
clutch

assembly

Water

Pump
Removal

1
Remove

upper
and

lower
radIator
hoses
from

the
thermostat

housmg
and

cylmder
block
re

spectIvely
Dram
coolant
from
rad1ator
and

cylInder
block

2
Loosen
the
alternator

mountlng
bolt
and
the

adjustIng
bolt
on
the
alternator

mountIng

bracket

3
Move
the
alternator
toward
the

cylinder

block
untIl
slack
IS
eVIdent
10

the
fan
belt
Re

move
fa
belt
fro
alternator
water

pump
and

crankshaft

pulley

4
It
IS
difficult
to
remove
the
water

pump
from

the
front

housmg
With
the
radiator
and

top

shroud
10

place
so
remove
them

5
Remove
the
bolts

holdmg
the
fan

assembly

to
the
water

pump
and
remove
the
fan

assembly

6
Remove
the
bolts

holdmg
the
water

pump
to

the
front

housmg
as
shown
In

Figure
S

Water

Pump
Disassembly
Repair
and

Assembly

Disassembly
or

attempted
repaIr
of
the
water

pump
assembly
IS
not
recommended
If
the

pump
assembly
IS
corroded
the

vanes
are
dam
aged
or
the

bearmgs
are

nOISY

replace
the

entIre
umt

1

Inspect
the
water

pump
assembly
and

replace

If

reqUIred

2

If
the
water

pump
assembly
IS
stIll
serVIce

able
clean
It

thoroughly
before
mstallatIon

3
Assemble
the
water

pump
assembly
m
the

front
cover
10
the
reverse
order
for

disassembly

Do
not
reuse
old

gaskets

4

Replace
the
fan

assembly
on
the

water

pump

and
mstall
the
radiator
and

top
shroud

5

Inspect
the

fan
belt

carefully
for

SIgnS
of

wear

or
cracks
DIscard

It
If
10
doubt

6
Install
the
fan
belt
around
the
crankshaft

pulley
water

pump
pulley
and
the
alternator

pulley

7

Adjust
the
alternator
on
Its
bracket

so
there

IS
no
more
than
0
5
10

deflection
of
the
fan

belt
when

pushed
10

by
thumb

pressure

8

TIghten
alternator
bracket

adjustIng
bolt
and

alternator

mountmg
bolt

securely

9
Install
the

upper
and
lower
rad1ator
hoses

and

tIghten
securely

10
Refill
the
radIator
and

coolmg
system
With

approved
coolant

or
water

NOTE
Because

of
the

many
aluml

num

parts
In
the

engine
a

hIgh
qualIty

antI

freeze

compound
should
be
used

In
the

cooling
system

11
Start
the

engme
and
run
untIl

operatIng

temperature
IS
reached
or
untIl

you
re
sure
the

thermostat
has

opened
and
coolant
IS

CIrCulatIng

throughout
the
entIre

coolIng
system
Top
up

radIator
as

reqUIred

COOLING
SYSTEM
89

FAN
CLUTCH

Fan
Clutch

Operation
and

Inspection

Figure
6
shows
a

typICal
fan
clutch
dISas

sembled
Check
the
umt
whenever
the
water

pump
IS
removed
or
whenever
troubles
are

suspected
m
the

assembly
OperatIon
of
the
fan

clutch
should

be
observed
when
the
vehIcle
is

at

nmning

temperature

Operation
plate
Dust
cover
Drum

o9
Q

SpIder
assembly
LIning

CD

1
Warm

up
the

engme

2
MaIntam

engIne
speed
at
2
500

rpm

3

Usmg
a
thermometer
measure
the

temper

ature
close
to
the
fan
clutch

assembly
on
the

fan

4
The
clutch
should

engage
when
the

temp

erature
reaches
17

degrees
F
65

degrees
C

Conversely
the
clutch
should

deenergIze
when

the

temperature
drops
to
97

degrees
F
54
de

grees
C

5
Take
the
measurements
at
least
twice
SInce

the
thermostat
has
somewhat
of
a
tlme

lag

6
If
the
fan
clutch
falls
to

operate
properly
It

should
be
dIsassembled
and
servIced

Fan
Clutch

Disassembly

1
Follow
the
mstructIons
as

prevIOusly
gIven
to

remove
the
fan
and
clutch

assembly
from
the

water

pump

2
Refer
to
the

appropnate
exploded
illustratIon

for

your
model
and

to

Figure
7
which
shows
a

typiCal
fan
clutch

assembly

3
DIsassemble
unit
and

mspect
all

parts
for

signs
of
wear
or

breakage

4
To
check
the

operatIon
of
the
fan
clutch

thermostat

submerge
the

operatIon

plate
With

the
thermostat
In
hot
water
of
126

degrees
F

70

degrees
C
for
two
to
three
mmutes

Replace

if

It
faIls
to

operate

5
Assemble
the

fan
clutch
m
the
reverse
order

o

dIsassembly
THERMOSTAT

The

system
thermostat
IS
located
inside
the

water
outlet
elbow
on
the

upper
left
hand

por

bon
of
the

cylInder
head
The

temperature
sens

Ing
deVice

IS
threaded
Into
the
base
of
the
therm

ostat

housmg
and
IS
connected

electrlcally
to

the

temperature
gauge
WIthIn
the
vehIcle
dash

board

The

wax

pellet
m
the
thermostat

expands

when
heated
and
contracts
when
cold
The

pellet

IS
connected

through
a

pIston
to

a
valve

Expan

sion

pressure
IS
exerted

agalUst
a
rubber
dIa

phragm
which
forces
the
valve
to

open
and

per

rrut
coolant
to
flow

through
the
entIre

system

As
the

pellet
cools
contractIOn
allows

a

spnng

to
close
the
valve

Thermostat
Removal

1

Open
the
draIn
cock
on
the
bottom
of
the

radiator
and
dram
out

enough
coolant
so
that

the
level
In
the
radIator
IS
below
the
bottom
of

the

upper
radIator
hose

2
DIsconnect
the

upper
radIator
hose
from
the

water
outlet
elbow

3
Remove
the
two
nuts

holdIng
the
water
outlet

elbow
to
the
thermostat

housmg

4
Remove
the

gasket
and
thermostat
from
the

housmg
as
shown
m

FIgure
7

Thermostat

Inspection
and

Replacement

Submerge
the
thermostat
In
a

pan
of
water

Heat
the
water
and
momtor
the

temperature

2
The
thermostat
should
start
to

open
at

1796
1
27

degrees
F
82
1
1
5

degrees
C
Max

Imum

opemng
should
occur
at
203

degrees
F
95