1968 DATSUN 510 lights

10
CHAPTER
THREE

pressure
bUllt

up
In
each

cylInder
The

readIngs

when

properly
Interpreted
IndIcate

general
cyl

Inder
and
valve
condltlOn

Vacuum

Gauge

The
vacuum

gauge
IS

easy
to
use
but
dIfficult

for
an

Inexpenenced
mechanIC
to

Interpret
The

results
when
conSIdered
WIth
other

findIngs
can

prOVIde
valuable
clues
to

pOSSIble
trouble

Connect
the
vacuum

gauge
WIth

a
T
connec

tIon
In
the
hose
from
the
carburetor
to
the

vacuum
advance
on
the
dIstnbutor
Start
the

engme
and
let
It
warm

up
thoroughly
Vacuum

readIng
should
be

steady
at
18
22
Inches

NOTE
Subtract
1
Inch

from

reading

for

every
1000

feet
of
altitude

Figure
1
shows
numerous

tYPical
readIngs

WIth

InterpretatIons
Results
are
not
conclusive

WIthout

companng
to
other
tests
such
as
com

preSSIOn
readIngs

Fuel
Pressure

Gauge

ThIS
Instrument

IS
VItal
for

evaluatIng
fuel

pump
performance
Often

a
vacuum

gauge
and

fuel

pressure
gauge
are
combIned

Dwell
Meter

A
dwell
meter
measures
the
dIstance
In
de

grees
of
cam
rotatIon
that
the
breaker

pOInts

remaIn
closed
while
the

engme
IS

runnIng
SInce

thIS

angle
IS
determmed

by
breaker

pOInt
gap

the
dwell

angle
IS
an
accurate
IndIcatIon
of

pOInt

gap
Many
tachometers
Intended
for

tunIng
and

testIng
Incorporate
a
dwell
meter
as
well
Follow

the
manufacturer
s
InstructIon
to
measure
dwell

on
the
Datsun

Tachometer

A
tachometer
IS
essential
for

tunIng
Datsuns

WIth
exhaust
emission
control
deVices

IgmtIOn

turung
and
carburetor

adjustments
must
be

per

formed
at
the

specified
Idle

speed
The
best
In

strument
for
thIS

purpose
IS
one
WIth

a

range
of

0
1
000
or
0
2
000

rpm
Extended

range
0

6
000
or
8
000
Instruments
lack

accuracy
at

lower

speeds
The
InStrument
should
be

capable

of

detecting
changes
of
25

rpm
Stroboscopic
Timing
Light

ThIS
Instrument

pernuts
accurate

IgnitIon

tImIng
By
f1ashmg
a

bght
at
the

preCISe
Instant

cylInder
No
1
fires
the

posItIon
of
the
crank

shaft

pulley
at
that
Instant

can
be
seen
Marks

on
the

pulley
bne

up
With

a
reference

pOInter
on

the
block

dunng
the

tIming
procedure
SUltable

bghts
are
neon
bulb

types
and
xenon
strobe

hghts
Neon

tunmg
bghts
are
ddticult
to
see
and

must
be
used
in

dImly
bt
areas
Xenon
strobe

bghts
can
be
used
In

bnght
sunbght
Use
the

bght
accordIng
to
the
manufacturer
s
InStruC

tIons

Exhaust

Analyzer

Of
all
Instruments
descnbed
here
this

IS
the

least

bkely
to
be
owned

by
a
home
mechanic

One
Instrument

samples
the
exhaust

gases
from

the

taIlpIpe
and
measures
the
thermal
conduc

tIVIty
of
the
exhaust

gas
SInce
different

gases

conduct
heat
at

varYIng
rates
thermal
conduc

tIVIty
of
the
exhaust
IS

a

good
IndIcatIon
of

gases

present
This
Instrument
IS
VItal
for

accurately

checkIng
the
effectIveness
of
exhaust
emIssion

control

adjustments
but
IS
too

expenSIve
for
an

amateur
mechanIC
to
conSIder

buying

STARTER

Starter

system
troubles
are

relatIvely
easy
to

ISolate
The

followmg
are
common

symptoms

and
cures

1

Engme
cranks

very
slowly
or
not
at
all

Turn
on
the

headhghts
If
the

bghts
are

very
dun

most

likely
the

battery
or
the

connecting
WireS

are
at
fault

Check
the

battery
using
the

pro

cedures
descnbed

in
the
Tune

up
chapter
Check

wmmgfur
e
s
wom
andd
connectIom

H
the

battery
and

connectIng
WIres
check

good
turn
the

headlIghts
on
and

try
to
crank
the

engIne
H
the

lIghts
dIDl

drastIcally
the
starter
is

probably
shorted
to

ground
Remove
the
starter

and
test
it

usmg
the

procedures
gIven
in

Chapter

NIne
If
the

lights
remain

bnght
or
dun

slIghtly

when

crankIng
the

engme
the
trouble

may
be
in

the
starter
solenOId
or

wmng
To
ISolate
the

trouble
short
the
two

large
solenoid
ternunals

together
not
to

ground
if
the
starter
cranks

normally
check
the
solenoid
and

wmng
up
to
the

TROUBLESHOOTING
13

trouble

may
also
be
worn

bearings
Remove
the

alternator
and

repair

ENGINE

These

procedures
assume
the
starter
cranks

the

engme
over

normally
If
not
refer
to
Starter

section
m
this

chapter

1

Engme
won
t
start

Could
be

caused

by
the

IgOltlon
or
fuel

problems

First
determine
If

high
voltage
to

spark
plug

occurs
To
do
thiS
dISconnect
one
of
the

spark

plug
wires
Hold
the

exposed
wrre
termlOal
y
to

Y2
lOch
from

ground
any
metal
in

engine
com

partment
With
an
msulated
screwdriver
Crank

the

engme
over
If

sparks
do
not

Jump
to

ground

or
the

sparks
are

very
weak
the
trouble

may
be

10
the

IgnitIOn
system
See

Ignition
System
Trou

bleshootmg
to
further
check
If

sparks
occur

properly
the
trouble

may
be
10
the
fuel

system

See
Fuel

System
Troubleshootmg

2

Engme
misses

steadily

Remove
one

spark
plug
wrre
at
a
tune
and

ground
the
wrre
If

engme
mISs
increases
that

cyhnder
was
work

109
properly
Reconnect
the

wire
and
check
the
others
When
a
wire

IS
dIs

connected
and

engme
miss
remams
the
same

that

cylinder
IS
not

finng

Check

spark
as
descnbed
10

Step
1
If
no

spark

occurs
for
one

cyhnder
only
check
dlStnbutor

cap
wrre
and

spark
plug
If

spark
occurs

prop

erly
check

compressIOn
and
mtake
maOlfold

vacuum
to
ISolate
the
trouble

3

Engme
misses

erratlcally
at
all

speeds

Interrmttent
trouble
can
be
difficult
to
find
It

could
be
ill
the

Ignition
system
exhaust

system

or
fuel

system
Follow

troubleshooting
proce

dures
for
these

systems
carefully
to
isolate
the

trouble

4

Engme
misses

at
Idle

only

Trouble
could
exist

anywhere
ill

IgOltlon
system

Follow

Ignition
TroubleshootlOg
procedure
care

fully
Trouble
could
also
eXist
10
the
carburetor

Idle
crrcult
Check
Idle
mIXture

adjustment
and

check
for
restnctions
m
the
idle
crrcUlt

5

Engme
misses
at

high
speed
only

Problems
could
be
ill
the
fuel
or

IgOltlon
systems
heck
accelerator

pump
operation
fuel

pump

dehvery
fuel
hnes
etc
as
descnbed
under
Fuel

System
Troubleshootillg
Also
check

spark
plugs

and
wrres

6
Low

performance
at
all

speeds
poor

acceleratIOn

Trouble

usually
ill

IgOltlon
or
fuel

system
Check

each
With
the

appropnate
troubleshooting
pro

cedure

7
ExceSSive

fuel
consumptIOn

Could
be
caused

by
a

Wide

variety
of

seemmgly

unrelated
factors
Check
for
clutch

shppage

brake

drag
defective
wheel

beanngs
or

poor

front
end

alignment
Check

IgOltlOn
system
and

fuel

system

8
011

pressure
lamp
does
not

light
when

IgmtlOn

switch

IS
on

Check
the
alternator

warning
lamp
If
it
ISn
t
on

either

go
to

Step
1

Chargmg
System
Trouble

shootlOg
If

only
the
oil

pressure
lamp
IS
off

open

the

englOe
compartment
hd
and
locate
the
oil

pressure
sender
on
the
block
near
the
oil
filter

Make
sure
the
wrre
is
connected
to
the
sender

and

makmg
good
contact
Pull
the
wrre
off
and

ground
it
If
the

lamp
hghts
replace
the
sender

If
the

lamp
does
not

light
replace
the

lamp

9
011

pressure
lamp
lights
or

flickers
when

engme
IS

runmng

Indicates
low

or

complete
loss
of
oil

pressure

Stop
the

englOe
unmedmtely
coast
to
a

stop
With

the
clutch

dISengaged
Tlus

may

simply
be

caused

by
a
low
oil
level
or
an

overheatmg
en

glOe
Check
the
oil
level
and
fan
belt
tensIOn

Check
for
a
shorted
oil

pressure
sender
with
an

ohmmeter
or
a

contlOulty
tester
Remove
and

clean
the
oil

dipstick
and
check
oil
level
and

condition

RepleOlsh
or

replace
the
oil

as
re

qurred
Listen
for
unusual
nOISes

mdlcatmg
dam

aged
beanngs
etc
Do
not
re
start
the

engine

until

you
know

why
the

hght
went
on
and

are

sure
that
the

problem
has
been
corrected

IGNITION
SYSTEM

This

procedure
assumes
the

battery
IS
ill

good

enough
condition
to
crank
the

engme
at
a

normal
rate

148

CHAPTER

ELEVEN

1

Insert

key
in

IgnItion
switch
and
turn
to
first

posltlon

2

Depress
accelerator

pedal
fully
LISten
for

the
solenOId

to
click
If

a
clIck
is
heard
the

solenoid
is

operating
correctly

3

Replace
solenoid
if
click

IS
not
heard
Before

replacing
solenoid
dram

apprOlumately
2

pInts
of
transmission
011
from
tranSmISsion
Re

fill
when
solenoid

replacement
is

complete

4
If
solenoId
IS

operatlng
correctly
but
trouble

persISts
check
WIres
for

continuity
With
electri

cal
tester

Linkage
Inspection
and

Adjustment

To

inspect
and

adjust
the

linkage
on
the

transmission

proceed
as
follows

Figure
4
j

shows
the

linkage
for
column
shift
models
and

Figure
47
shows
the

lInkage
for
floor
shift

models

1
Move
selector
from
P
to
1
and
back

again

several

tImes
If
the

lInkage
is

correct
a

slight

click
sh
uld
be
felt

and
heard
when

the
selector

is

set
at
each

position

2
If
the
lever

position
is

mcorrect
adjust
the

lin

age
in

t
ie
ngin
C
Q1I1

lT
me
t

s9

mat

f46

OSIoI0mm

00197
to

mJ

r2
oN

k
@
FRONT

tion
D
of
the
detent
manual
valve

alignS
with

posItion
D
of
the

pOSItIon
plate
as
shown
in

the
illustrations

Inhibitor
Switc
h

Checks

and

Adjustment

The
inhibItor

SWitch

lights
the
reverse

lamp

and

enables
the
starter
motor
to

operate
in
the

neutral
and

park
positIons
Figure
48
shows
the

construction
and

mountlng
of
the
InhibItor

SWitch
To
check
the
mhIbltor
switch

proceed

as
follows

r

I
5

1
InhIbitor
switch

2
Menual
shalt

3
Washer

4
Nut
5
Manual

plate

6
Washer

7
Nut

8
Inhibitor

switch

9

Range
select
Iner

1
Move
selector
lever
to
reverse

position
and

clieck
that
reverse

lamp
bun

lignts
If

not
in

spect
bulb
and

replace
1f
defectlve
If
bulb
is
all

right
replace
mhibItor
switch

2
Check
for

proper
operation
of
starter
motor

in

neutral
and

park
positions
If
abnormal
check

to

see
that

lInkage
IS
correct
If

linkage
IS
cor

rect
replace
Inhibitor
SWitch

138

INDEX

H
OIl

pump

Descnptlon
36

Handbrake

Exploded
view

29

Adjustment
202

Inspection
and

repaIr
28

Cable
removal

front
sedan
and

wagon
197

Installation

58

Cable
removal
rear

pick
up
201

Removal

28
40

Cable
removal
rear
sedan

and

wagon
197

Cross
rod

removal

wagon
201

Exploded
views

198
200

p

Inspection
and

repair
201

Installation

201

Penodlc

mamtenance

Headlights

MaIntenance

mtervals
chart

7

Bulb

replacement
210

Penodlc

checks
6

Descnptlon
210

Recommended
lubncants
8

Exploded
view

219

Routine

checks
6

HeatIng
system

Piston

nngs

Descnptlon
210

Exploded
view

pick
up
213
Inspection
50

Exploded
VIews
sedan
and

wagon
214
215
Removal

45

Hood

lock
control
RIng
gap
50

Exploded
View

pick
up
225
Pistons

Descnptlon
34

Exploded
VIew
sedan
and

wagon
226

Inspection
50

Reassembly
54

Igmtlon
coil

111

R

Igmtlon

system

Tlmmg
23
Radiator

Troubleshooting
13

Exploded
view
90

Instrument

meters
and

panels
Removal
and

replacement
90

Descnptlon
210
Rear
axle

pick
up

Exploded
View

pick
up
213
Axle

case

166

Exploded
view
sedan
and

wagon
Inspection
and

mstalIatlon
164

1970
1972

212

Removal

164

Exploded
view

sedan
and

wagon
Sectional

view

163

through
1969

211
Rear

axle

wagon

Intake
manifold

Disassembly
158

Descnptlon
36

Exploded
view

158

Removal

42

Inspection
and

reassembly
160

InstallatIOn

160

Removal

158

M
Rear
axle
and

suspenSion
sedan

Exploded
view

152
153

Mam

beanngs
52

Inspection
and

repaIr
154

MaIntenance

penodlc
6
8

InstalIatlon
154

Master

cylInder
Removal

151

Exploded
vIew

smgle
188
Rear

spnngs
pick
up
166

Exploded
view
tandem

189
Rear

spnngs
wagon
161

Inspection
and

repllIr
188
Rear
axle
shaft
sedan

155
156

Reassembly
and
InstalIatlon

190
Rear

suspension
arm
sedan

155

Removal
and

disassembly
188
Rear

suspenSion
pick
up

Modelldentdicatlon

1

Exploded
view

166

Inspection
and

repllIr
167

InstalIatlon

167

0
Rear

spnngs
166

Removal

165

011

filler

30

Spnngs
166

d

43

Torques
67