1968 DATSUN 510 ECU

ENGINE
AND
IGNITION
TUNE
UP
21

many
types
of
test

eqUipment
and

may
be
used

as
a

gUide
If
the
manufacturer

s

mstructioQs
are

not
aVailable
Connections
shown
in

Figure
1

are
as
follows

1
Voltmeter

a
PosItive
lead
to
resistor
side
of
COli

b

Negative
1
ead
to

ground

2

Tlmmg
Light

a
PosItive
lead
to

posItive
battery
termmal

b

Tngger
lead
to
number
1

spark
plug

c

Negative
lead
to

ground

3
Tachometer

a
PosItive

lead
to
dlstnbutor
Side
of
coil

b

Negative
lead
to

ground

4
Dwell
Meter

a

PosItive
lead
to
dlstnbutor
Side
of
COlI

b

Negative
lead
to

ground

BAlTERY
INSPECTION
AND
SERVICE

1
Check
the
level
of
the

electrolyte
m

battery

cells
If

necessary
replemsh
with
distilled
water

Do
not
overfill

2

Measure
the

speCific
gravity
of
the

battery

electrolyte
Refer
to
the

followmg
table
2
Use
the

proper
size
socket
and
wrench
to

remove

spark
plugs
from
the

cyhnder
head

Make
certam
that
the

gaskets
are
removed
from

the

spark
plug
holes

3

Wipe
off
the
msulator
With
a
clean

rag
to

remove

grease
and
dirt

4

Carefully

mspect
the
msulator
and

body
of

each

plug
for

signs
of

cracks
or

chips

Replace

If

faulty

5

Inspect
spark
plug
threads
and
electrodes
for

damage
or
excessive
wear

Replace
as

requrred

Figure
2
shows
the

cond1t
J
on
of

normal
and
de

fectIVe

spark
plugs
along
with

an

explanation

of
the

causes
of

the
abnormal
conditions

6
If
the

spark
plugs
are
still
serviceable
clean

them

thoroughly
With
a

stiff
brush
or

preferably

With
a
sand

blasting
type
of
cleaner

7
File
the

center
electrode

so
that

It
has

a
fiat

surface

8
File
the
surfaces
of
the
outer
electrode

so
that

all
surfaces

are
fiat
and
smooth

9

Usmg
a
feeler

gauge
adjust
clearance
be

tween
the
electrodes
to
0
031
to
0
035
m
0
8

to
0
9mm
as
shown
m

Figure
3

Full

Charge
Value

CD
68

degrees
F

PermiSSIble
Value
20

degrees
C
3

Frigid
chmates

Tropical
chmates

Other
climates
Over
1
22

Over
118

Over
1
20
128

123

126

3
Clean

top
of

battery
and
termmals
With
a

solutIOn
of

bakmg
soda
and
water
Rmse
off
and

dry
thoroughly
Top
of

battery
must
be
clean
to

prevent
current

leakage
between
termmal
and

from

pOSitive
termmal
to
hold
down

clamp
Pro

longed
accumulatIOn
of
aCid
and
dirt
on

top
of

battery
may
cause

blIstenng
of
the
matenal
cov

enng
on
the
connector

straps
and
detenoration

of
the

straps
themselves

4

Tighten
the
cable

connectors
to
the
termmal

securely

5
Coat
the
termmals

lIghtly
With

petrolatum
to

protect
them
from
corrosion

SPARK
PLUGS
INSPECTION

AND
SERVICE

1
Remove

spark
plug
WIres
Mark
them
to
fi

sure
correct

replacement
J

J

I

I

j

j

10
Remstall

spark
plugs
Make
certam
to
use

a
new

gasket
for
each

plug
Use
a

torque
wrench

to

tighten
spark
plugs
from
11
0
to
150
ft
lb

1
5
to
2
0

kg
m

11
Remstall
WIres

DISTRIBUTOR
INSPECTION

AND
SERVICE

Dependmg
on
the
model

year
velucles
have

a

smgle
pomt
or
a
dual

pomt
dlstnbutor

system

ENGINE
AND
IGNITION
TUNE
UP
23

CD
ADJUSTING
SCREWS
FOR
THE
POSITION

OF

RETARDED
BREAKER
POINT

r

A
O
S

8

6

C

0

18

2
6
10
14

contact

pomt
assembly
from
the
dIStnbutor
and

clean
or

replace
the

pomts
Use
a

pomt
file
to

clean
the
contacts
Do
not

attempt
to
remove
all

roughness
Apply
a
trace
of

beanng
lubncant

to
the
breaker
cam

5
Once
the

pomts
have
been
cleaned
or
re

placed
mstall
the

assembly
m

the
dlstnbutor

Make
certam
to
reconnect
wires

6

Adjust
the

pomt
gap
Figure
S
With
the
use

of
a
screwdnver
and

gap
gauge
Make
certaIn

the

rubbmg
arm
on
the
contact

assembly
IS
rest

mg
on
the

hIgh
pomt
of
the
carn
Pomt

gap

should
be

adjusted
to
0
0177

through
00217

m

0
45
to
0
55mm

CD

7
Check
condenser

capacItance
for

a

readmg
of

o
22

through
0
24
mIcrofarads

Replace
If
de

fectIve
As
a
matter
of

good

practIce
the
con

r
denser
should
be

replaced
whenever
the

pomts

are

replaced

8

Inspect
the
InSulatIon
on
all
WIres
WIthIn
the

dIStributor

Replace
If
defectIve

9

Inspect
the
WIre
towers

atop
the
dIStnbutor

cap
for

SignS
of
dIrt
or
corrosIOn
A

pencIl
wIth

fine

emery
cloth

wrapped
around
the

erasl
e
end

can
be
used
to
clean
and
burnISh
the
metal
sur

faces
Make
certam
to
blowout

any
dust

10

Replace
the
rotor

md
the

cap
on
the
dIs

tnbutor
and
secure
the
two
hold
down

clamps

FI

ly
msert

IgrntIon
WIres
mto

proper
towers

ill

cap

IGNITION
TIMING

IgmtIon
tIDlIDg
is

adjusted
with
the

engine

runnmg
Use
a

strobOSCOpIC
timing
hght
and

pro

ceed
as
follows

1
Make
certam
that

spl
l
k

plug
gaps
and
dIs

tnbutor
contact

pomts
are

accurately
set

2
DISconnect
the
vacuum
hne
from
the
carbu

retor
at
the
dIstrIbutor

Plug
the
end
of
the

vacuum
hne
wIth

tape
or
a
wooden

stopper

3
Hook

up
the

trmmg
light
per
mstructIons

4
Hook

up
tachometer

per
mstructions

5
The

tImmg
marles
are
located
on
the
front

edge
of
the
crankshaft

pulley
The

grooves
are

graduated
m
5

degree
mcrements
The

top
dead

center
mark
S
located
to
the
extreme
left
hand

sIde
of
the

engme
as
vIewed
from
the
front
A

statIOnary
pomter
S
connected
to
the

cylinder

28

CHAPTER
FIVE

011

gallery
supphes
011
to
the
crankshaft
mam

beanngs
Dnlled

passages
m
the
crankshaft

direct
oil
from
the

mam

bearings
to
the

con

nectmg
rod

beanngs
011

mJected
from

jet
holes

in
the

connectIng
rods

IS
directed

to
the

cylmder

walls
and

piston
pins
0U
dlstnbuted
from
the

mam

gallery
enters
the
cham
tensioner
The

pad

IS
held

against
the
cham

by
011

pressure
and

spnng
tension
The

tmung
chain
receives
011

through
the

Jet
located
near
It

LubncatIon
IS

supphed
to
the

cyhnder
head

mam
011

gallery
through
the
crankshaft
center

beanngs
Camshaft

beanngs
on
the

cyhnder

head

are
fed

directly
from
the

cyhnder
head

mam

gallery
The
rocker

arms
and
valves
are

lubncated

intermittently

by
the
camshaft
011

gallery
and
the

small
channel
at
the
base
CIrcle

portIon
of
each
cam
OllIS

supphed
to
the
cam

shaft
011

gallery
through
the
No
2
and
No
3

camshaft

bearings

OIL
PUMP

The
011

pump
IS
mstalled
m
the
bottom
of

the

front
cover
as
shown
in
2
The

pump
is

held
m

place
by
four
bolts
to
the
front
cover
It

IS
a
rotor

type
dnven

by
the
011

pump
spmdle

whIch
IS
dnven
off
of
the
crankshaft
Pressure
IS

regulated
by
a
valve
shown

m

Figure
3
A
slot

at
the

top
of
the
dnve
rotor

engages
a

dog
clutch

at
the
lower
end
of
the
distnbutor
dnve
shaft

assembly
The

011

pressure
rehef
valve

IS
not

adjustable
In
the
released

pOSition
the
valve

pernnts
011
to
be

by
passed
through
a

passage
on

the

pump
cover
to
the
mlet
Side
of

the

pump

CD
CD

Oil

Pump
Removal

1
Remove
the
dIStnbutor
from
the

top
of
the

front

cover
Make
certam
to
mark
the

posItIon

of
the

dtstnbutor
relative
to
the

front
cover
so

that

It
can
be

replaced
m
the

same

posItIon

2
Drain
the

engme
od

3
Remove
the
front
stabIhzer
from
the
bottom

front
of
the

engme
compartment

4
Remove
the
front

splash
shIeld
from
the
bot

tom
front
of
the

engine
compartment

5
Remove
the
bolts

holdmg
the
oil

pump
to

the

front
cover
Remove
011

pump
and
drive

gear

spmdle
from
the
front
cover

Disassembly
Inspection
Repair
and

Assembly

Figure
4
IS
an

exploded
VIew
of
the
011

pump

assembly
Refer
to
the

figure
and
the

accom

panymg
index

1

Separate
the

body
cover
from
the

011

pump

body
by

unscreWIng
the

secunng
bolt

2
Remove
the

pump
dnve
mechamsm
and

dnver

gear
from
the

pump
body
Clean
the
dIS

assembled

parts
m
a
suitable
solvent

3

Inspect
for

Signs
of
wear
or

damage
Reparr

or

replace
as

necessary

4

Inspect
the
drive
rotor
shaft
for

excessive

wear
or

sconng
Check
the

followmg
clearances

a
Side

clearance
between
mner
and
outer

rotor
00020
to
00047
m
005
to

0
12mm

b

Tip
clearance
0
0492

m
0
12mm

c
elearance
between

outer
rotor
and

body

00059

to
0
0083
in
015
to
0
21mm

5
Check
the
relief
valve

spring
dtmenslOn
to

ensure
that
It
has
not
lost
tension

Free

length

should
be
2
24

m
57mm

Compressed

length

38

CHAPTER
SIX

EMISSION

CONTROL
DEVICES

All

Datsuns
have
a
sealed

type
of
crankcase

emISSion
control
device
and
an
exhaust
emISsion

control
deVice
Models
sold

m
Cahfornla

smce

1970
also
have
an

evaporative
emisSion

control

deVice
An

rmportant
part
of
the

exhaust
control

device
is
the
air

pump
located

at
the

bottom
left

hand
side
of
the

engme
It

IS
dnven

by
a
belt
off

of
the
crankshaft

pulley
and

supphes
air
to
the

exhaust

system
In
1972

an
electric
blower
in

corporated
m
the

air
cleaner

replaced
the

mechanical

pumI

ENGINE
REMOVAL

Expenence
has

shown
It
IS
easier

to
remove

the

engine
and

the
transmission

as
a

smgle
UnIt

than

to
remove
the

engme
alone
Once

the
en

gine
and

transmiSSIon
are

out
of

the
vehIcle
the

tranSmIssion
can
be

detached
from
the

engme

To
remove
the

engme
transmISsion

proceed

as
follows

1
Scribe

ahgnment
marks
on
the
hood

around

the

hmges
ThIS

will
make
remstallatlon

eaSIer

2
Remove
the

two
bolts
that
secure

each

hInge

and

remove
the
hood

It
is

not

necessary
to
re

move
the
hood

support
from

the

engme
firewall

3

DISconnect
the
lower

radIator
hose

from
the

right
hand
SIde
of
the

engine
and
at
the
bottom

of
the
radIator
ThIS
will

pernnt
coolant
to
dram

from
the

engme
and
the

radIator

4

Remove
the
draIn

plugs
from
the

engine

pan

and
translIDSsIon

and

completely
dram
lubn

cants
Into
suitable

contamers

5
DISconnect

the

battery
cables
from

the
bat

tery
loosen

the
two
hold
down

clamps
and

re

move

the

battery

NOTE

The
location
and

number

of

hoses

to
be
removed

from
the
air

cleaner
varies

from
model
to

model

It
IS

normally
easier
to
remove

the

hoses

from
the
sources
rather

than

try

to

dISconnect

them

from

yndemeath

the

air

cleaner
The
1972
model

Will

requlre
dlsconnectlOn

of
the
electrica1

cirCUit

In
the
air

cleaner

system
wing
nut
from
the

top
of
the
air
cleaner
and

remove
the

aIr
cleaner

7
DIsconnect
the

upper
radiator
hose
from
the

radiator
and
the
thermostat

housmg
Remove

the
hose

8
Disconnect
the
two
heater

hoses
from

the

nght
hand
side
of
the

engme
TIe
these
bac
so

they
won
t
interfere
with

removal
of
the

engme

9
Remove
the
radIator

grille

by
unscrewing
all

mountmg
screws

10
Remove
the
four

mounting
screws

holding

the
fan
shield
to
the
backside

of
the

radiator

11
Remove
the
four

mountmg
bolts

holdIng
the

radiator

In

place
In
automatic
tranSmISsion

models
dISconnect

the
two
transnnsslOn
oIl

cooler

lInes
from

the
bottom
of
the
radiator

Pull
the

radiator

straight
up
to
remove
Remove

the
fan

shield

12
Loosen

the

adjustment
and

mounting
bolts

from

the

retamIng
brackets
on
the
alternator

and

air

pump
If
so

eqwpped
The

alternator
is
lo

cated
at
the
bottom

nght
hand
Side
of
the

engme

and
the
air

pump
on
the

lower
left
hand
Side

13
Loosen
tenSIon

on
the

two
dnve
belts

re

move
the
belts
from

the
alternator
and
air

pump

and
then
from
the

fan

pulleys

14
Remove
the
bolts

holdIng
the
fan
and

pulley

to
the
water

pump
assembly
and
remove
the

fan
and

pulley

15

DISconnect
the
fuel
hne
from
the
fuel

pump

16
DIsco

ect
accelerator

control

linkage
and

choke

WIre
at
the
carburetor

17
Disconnect

the

wiring
from

the
starter

motor
alternator

Ignition
coIl
oIl

pressure

switch

and

temperature

transmItting
unit

NOTE
The

following

steps
are

per

formed

from
under
the
car
lack

up

the

front
of
the

car
and

position

stands
under

the

front
support

points

to

proVide

working
room

under

the

vehicle

WARNING

Never

climb
under
a
vehicle
that
is

supported
by
the

lack
only
If
stands

are

not
avflllable

sturdy
wooden

blocks
can

be
U3ed

6
Disconnect
all
hoses

that
lead
to
the

air

cleaner

remove
two

bolts
that
hold
the
air

cleaner
to

its

mountmg
bracket

unscrew
the
18
Remove
two
bolts

holdIng
the
clutch

operat

Ing
cylInder
to
the

flywheel
hOUSIng
shown

m

ENGINE
39

Figure
11
Remove
the
clutch
return

spnng
from

Its

holdmg
bracket
and
the
clutch

operatmg

cylmder
from
the
clutch
withdrawal
lever

19
Disconnect
the

speedometer
cable
from
the

side
of
the
transnnsslOn
as
shown
m

Figure
12

20
Disconnect
the
flat

attachmg
plug
connector

from
the
reverse

lamp
sWitch
on
the

translDlSSlon

housing

21
At
the
transnnsslOn

housmg
disconnect
the

shIft

and
the
select
rods
Remove
the
cross
shaft

assembly
by
remOVIng
Its
bracket
from
the
Side

member

22
DISconnect
the
front
exhaust

pipe
from
the

exhaust
manIfold

by
remoVing
the
two
connect

mg
bolts

23
Disconnect
the
center
exhaust

pipe
from
the

rear
exhaust

pipe

24
Remove
the
front
exhaust

pipe
the

pre
muffler
and
the
center
exhaust

pipe
from
the

vehicle

25
Disconnect
the
dnve
shaft
from
the

matIng

flange
of
the

gear
carner

26
Insert
a

Jack
under
the
transmiSSIOn
and

jack
It

up
Just
a
little
to
remove
some
of
the

tension
from
the
rear
motor
mounts

CAUTION

Use
care
m
the

placement
of
the

lack

head
to

prevent
transmiSSIOn

housmg

damage
A
block

of
wood
can
be
m

serted

between
the

Jack
head
and

transmISSIOn

for

protection
The
block

of
wood
should
be

long
enough
to

span
the
transmiSSion

housmg

27
Remove
the
rear

engine
mountIng
cross

member

by
remoVing
the
bolts

holdmg
the
en

gine
mountIng
msulator
the

mountIng
cross

member
and
the
handbrake

clamp

28
Remove
the
bolts

secunng
the
front

engine

mountmg
msulators
to
the
front
cross
member

NOTE
At
thiS
time
all
Wires
hoses

and

lmkages
should
have
been
dIScon

nected

from
the

engme
and
transmIS

sIOn

Recheck
thiS
and

make
sure
that

no
loose

ends
Will

hamper
actual
en

gme
removal

29

RIg
a
cham

or
cable
hOist
to
the

lifting
eyes

stnngers
located

on
the

nght
front
and
left

rear

of
the

cylmder
head
Take

up
slack
m
the
hOist

30

Figure
13
shows
the

engme
bemg
lifted
Re

move
the

engine
slowly
by
lowenng
the

jack

beneath
the
transnnssion

gradually
until
It
can

@

4Z
CHAPTER
SIX

the

adJustmg
bar
mto
the

mountmg
flange
of
the

arr

pump

2
Remove
the
bolt

lInking
the

arr

pump
to
the

mountmg
bracket
and
remove

pump

3
The
bracket
has
four
bolts
to
the

engme
the

adJustmg
bar
mounts
on
the
front
cover
WIth
two

bolts
Remove
these

to
free
the
front
cover

Water

Pump
Removal

I
Remove
the
bolts
and
lockwashers

Jommg

the
water

pump
to
the
front
cover
The
number

of
bolts
vanes
from

year
to

year
due
to

pump

aesign
clianges
Remove
water

pump

Fuel

Pump
Removal

I
Remove
the
two
nuts
and
lockwashers
secur

mg
fuel

pump
to
the

engIne
and
remove

pump

Rocker
Arm
COYer
Removal

I
Remove
SIX
bolts

holdmg
rocker
arm
cover

to
head
and
lIft
off
cover

Intake
and
Exhaust
Manifold
Removal

I
Remove
eleven
nuts
and
lockwashers
that

secure
the
mtake
and
exhaust
manIfolds

2
Remove
mtake
and
exhaust
manIfolds
as

shown
in

Figure
16

Thermostat
and
Water
Inlet

Housings

1
Remove
two
bolts
and
lockwashers

secunng

thermostat

housmg
to
head
Remove

housmg
as

shown
m

Figure
17
@

2
Remove
two
nuts
and
lockwashers
from

top

of
thermostat

housmg
to

gam
access
to
thermo

stat

3
Remove
two
bolts
and
lockwashers
that
hold

water
mlet

housmg
to
front
cover
and
lIft
off

housing

Front
Cover
Removal

1
Remove
bolt
and

washer
from
center
of
crank

pulley
Pulley
tool
Will
be

necessary
for
removal

from
crankshaft

2
Remove
nme
bolts
and
lockwashers

holdmg

front
cover
to

cylInder
block
then
remove
cover

as

shown
m

Figure
18

@

Chain
Tensioner
and
Drive
Chain
Removal

I

Figure
19
shows
the
camshaft
dnve

mechan

Ism
Remove
the
two
bolts
and
lockwashers
010

ENGINE

43

@

0
00

o

mg
the
cham

tenslOner
to

the
block
to

free
the

sprIng
loaded

tenslOner

assembly

2
Remove
the
four

bolts

and

lockwashers
hold

mg
the
left
and

rIght
sIde

cham

guides
to
the

cylmder
block

Remove
the

guIdes

3
On

the
front

of
the
camshaft

remove

the
bolt

and

lockwasher

holdIng
the
fuel

pump
cam
as

sembly
and
the

eam

sprocket
to
the
eam

4
LIft

the
drIve

chaIn
asIde

and

remove
the

earn

sprocket
and
fuel

pump
cam
from
the

cam

shaft

as
shown

In

Figure
20

5

Remove
the
dnve
cham
from
the
crankshaft

drIve

spr6cket

Cylinder
Head
Removal

NOTE
Removal

of
the

cylinder
head

requires
a

special
tool

identified
as

DatsunST49010000
and
is

shown
In

FIGURE
21
@

I

USIng
the

specIal
tool
or

eqUIvalent
remove

ten
bolts
and

washers

holdIng
cylinder
head
to

cyhnder
block

See

Figure
22

2

Remove
head
from

block
and
dtscard

gasket

Oil
Pan
and
Strainer
Removal

I
Invert
the

engme
remove
22
bolts
and
wash

ers

secunng
pan
to
block

and
remove
011

pan

On

automatIc
transmission

models

tpe
pan
bolts

also
hold
the

oIl
cooler
hose
and
tube

clamps
in

place
DISCard

011

pan
gasket

3

Figure
23

shows
the
oIl
stramer

mOlJ
lted
m

the
block

Remove
two
bolts
and
washers

for

dISassembly

Crankshaft
Removal

I
Use
a

gear
puller
as

shown
III

Figure
24

to

pull
the
oIl
thrower

crankshaft
worm

gear
and

drive
cham

sprocket
from

the
crankshaft

The

above

parts
are
held
In

place
by
three

woodruff

keyS

2

DISconnect
the

pIston
and

connectrng
rod

assemblIes

from

the
crankshaft

by

removing
the

44
CHAPTER
SIX

@

@

eight
connecting
rod
bolts
Remove
the
four

bottom

caps
along
with
assoc1ated
rod

beanngs

as
shown

m

Figure
25
Be
certain
to

identify

each

part
for

later

reassembly
on

the
correct

rod

3

Gently
push

up
each

connecting
rod
into

the

cylinders
far

enough
to

clear
the

crankshaft
Do

not

push
them

up
so
far
that
the

piston
rings
hit

the

ridge
at
the

top
of

the

cyImders
Remove
the

upper
beanngs
and

identify
for
later

reassembly

4
Remove

the
five
bolts

holding
the

flywheel

to
the

crankshaft
as
shown
in

Figure
26
For

models
Wlth
automatic
transmisslOn
there

is
a

convertor

plate
in
front
of
the
drive

plate
fly

wheel
and
a
crankshaft

plate
m

back
of
the

drive

plate
also

attached

by
the
five
bolts

5
Remove
bolts
from
front
main

bearing
cap

and
three
center
main

bearings
Identtfy
caps

and

beanngs
for

reassembly
@

NOTE
Removal

of
the
rear
mam

bearing

requires
the
use

of
a

specuzl

tool
ST4463000D
shown
in

f
Q

URE
27

6
Remove
the
rear
mam

bearing
cap
as
shown

in

Figure
28

7
Remove
the

rear
011

seal
as
shown
m

Figure

29

8
Remove

crankshaft
from

cylinder
block

9
Remove

and

1dentify
the
mam

beanngs
from

the

cyhnder
block

JOurnals