1968 DATSUN 510 reset

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2

24

CHAPTER
FOUR

block

and
should
be
used
as
the
reference

point

m

II
1akmg

adjustments

6
With
a

piece
of
white
chalk
mark

a
hne
down

the
center
of
the

pomter
and
mark
the

timing

groove
on
the
crankshaft

pulley
which

IS
to
be

used
m

tImmg
the

engine
SpecIficatIon
for
tun

ing
reqUIres
trlhmg
at
10

degrees
before

top

dead
center
wluch
would
be
the

fourth
mark

from
the
left
end
of
the

row
of
marks

7
Loosen
the
hold
down
bolt
at
the
base
of
the

dlstnbutor

8
Locate
the
slow

speed
1
Ile

adjustIng
screw
on

the
carburetor

so
that
Ile

speed
can
be

adjusted

whIle

runnmg
Also
locate
throttle

adJustmg

screw

9
Start

engme
and

adjust
speed
With
the

adJust

ing
screws
to
the

readmgs
below

Smgle
pomt
dIStributor
600

rpm

Dual

pomt
trlbutor
700

rpm

10
Alternate

adjustment
of
the
two
screws

untIl
the
smoothest
Idle
at
the

proper
speed
IS

achieved

11
Pomt
the

tlIrung
lIght
at
the

stationary

pomter
When
the

lIght
flashes
the

timmg
mark

n
the
crankshaft

pulley
should

hne

up
With
the

mark
on
the

stationary
pomter
If
It
does
not

exactly
Ime

up
rotate

the
dlstnbutor

gradually

untIl
the
marks

align
mdlcatlng
correct

timmg

12
Shut
off
the

engme
remove
the

tmung
lIght

and
tachometer

tighten
the
hold
down
bolt
on

the
dlStnbutor
and
connect
the
vacuum
advance

hne
to
the
tli
tnbutor

IGNITION
TIMING

IDLE

SPEED
IDLE

MIXTURE

DUAL
POINT
DISTRIBUTOR

ONLY

The

followmg
applies
to
velucles
With
dual

pomt
distributor
and
an
exhaust
emission
con

trol
deVice
If
these

procedures
are
followed

ha
ul
exhaust

emisSion
should
be
below
the

maximum
allowable
level

1
Locate
the
Idle

and
throttle

adJustmg
screws

on
the
carburetor

2
Warm

up
the

engine
thoroughly

3
Connect

tachometer
and

tmung
light

4
Set
the

Id
le
speed
at
700

rpm
With
the
Idle

adjust
screw
5

Adjust

IgnltJ
on

tuning
at
10

degrees
before

top
dead

center

6
Increase
the

speed
of
the

engme
to
2
000

rpm

With
the
accelerator

or
throttle

hnkage
and
hold

for
about

15
seconds

7
Return
to
Idle
for
one
mmute

8
Set
the

engme
to
best
Idle
at
750

rpm
770

rpm
for
automatJ
c
transIDlsslOn
With
the
Idle

and
throttle

adJustmg
screws

9
Re

uce

engme
speed
at
700

rpm
720

rpm

for

automatic
transmission

by
turnmg
the
Idle

adJustmg
screw
clockWise
for
a
leaner
IlliXture

10
Connect
a
wife
lead
between
the
advance

ami
retard
Side
tenrunals
See

Figure
4

Speed

should

drop
from
100
to
150

rpm

11
Check

IgIl1tIon
tmung
With

tImmg
light
It

should
now
be
at

top
d
ad
center

12
If
the

tlmmg
IS

nSJt
correct

stop
the

engme

and

adjust
the
retarded
breaker

pomt

13
Start
the

engme
and
reclieck
ili

tmung
If

l

incorrect
reset
the
retarded
breaker

pomt
until

it
IS
correct

Repeat
s
nece

s

14
Disconnect
the
wife

bet
reen
the
advance

and
retard
termmals

15
Recheck

tmung
It
should

be
10

degrees

before

top
dead

center

16
If
mcorrect

repeat
the
above

procedures

un
tIl

satIsfactory

17

T
he
Idle

speed
of
automatic
transnllsslOn

vehicles
should

be
about
575

rpm
With
the

gear

j

selector

m
the

dhve

poSltlon
c

t

DWELL
ANGLE
SETIING

1
Connect

the
dwell

angle
meter

2

PLoJust
dwell

angle
to
49

to
55

degrees

OMPRESSION
TEST

I

A

compressIOn
test
IS

performed
to
check
for

worn

piston
nngs
or
to
detect
the

cause
of

a

low

speed
miss
Before

undertaking
the

test

el
llmate
the

pOSSibility
of

sticky
valves

by
usmg

one
of
the

oil
additives

deSigned
for
the

purpose

With
valves
free
test

compressIOn
as

follows

1
Run
the

engme
for
15
to
20
mmutes
untIl

normal

operating

temperatures
are
obtained

2
Shut
off

engme
remove
arr
cleaner
and

110

CHAPTER

NINE

Points

Figure
S8

gives
details
of
the

sIngle

pomt

system
The

pomts
should
be

Inspected
penod

Ically
for
condItIon
and

wear
At
the

same
tlme

the

pOInt
gap
should
be
checked

and
reset
1f

necessary
Pomts
should
be
checked

at
least

every
2
500
mIles

SET
SCREW

PRIMARY

LEAD

TERMINAl

@

1
Unhook
the
two

clamps
holdmg
the

distnbu

tor

cap
to
the
dIStrIbutor

2
Remove
the
dlstnbutor

cap
and

pull
the
rotor

off
of
the
center

shaft

3

Carefully
note
or
mark
the

pOSItIon
of
the

dIStrIbutor

relatIve
to
the

fixmg
plate
at

the

bottom

of
the

distrIbutor

4
Loosen
the

hold
down
bolt
at
the
bottom
of

the
dlstnbutor

and
rotate
the
dIStnbutor

untIl

the

rubbmg
arm
that
rests
on
the
dIStrIbutor

cam

IS
at
a

high
pomt
of
the

cam
At

that

pomt
the

pomts
should
have

a

gap
between
them

5

Inspect
the

general
condItion

of
the

pomts

for
wear

pIttIng
and
smoot1mess

Pomts
that
are

worn

excessIvely
or
are

badly
pItted
must
be

replaced
Pomts
In

good
condItIon
can
be

re

surfaced

With
a

pOInt
file
number

600
sand

paper
or
WIth
a
small
whetstone

6
To

replace
or

remove
the

pomts
from
the

dIStrIbutor
loosen
the

screws
at
the
contact
arm

and

pnmary
lead

connectIOn
Do
not
remove
the

screw
Pull

up
on
the

primary
lead

to

dISc
onnect

the

termmal
from
the
contact
arm

7
Loosen
the
screw

holdmg
the

ground
WIre
to

the

pOInt
assembly
and

remove
it

S
Loosen
and

rell
ove
the
screws

holdIng
the

pomt

assembly
to
the

dIStnbutor
breaker

plate
Remove
the

pOInt
assembly
from
the
dIStrIbutor

Inspect
condItIon
of
the

pOInts
and

reconditIon

or

replace
as

reqUIred

9

Replace
the

points
Make
certain

to
recon

nect
the

ground
WIre
and
the

pnmary
lead

Apply

3

trace
of
cam

lubncatlng

grease
to
the
cam

upon

reassembly

10
WIth
the

pOInts
open
adjust

gap
It
should

be
between
00177

to
00217
In
045
to
055

mm

11
Install
the
rotor

put
the

cap
on
the
dIStribu

tor
secure
the

clamps
and
return
the
dtstrIbutor

to
its

onginal
pOSItIon
TIghten
the
hold
down

bolt

CONDENSER

PeriodJcally
check

the
condenser
electrIcal

lead

wire
and

the
set
screw
connectIon
As
a

matter
of

good
practIce
replace
the
condenser

whenever
the

pomts
are

replaced

DISTRIBUTOR

DISASSEMBLY

1
Take
off
the
dIstrIbutor

cap
and

remove
the

rotor

2
DIsconnect
the

vacuum
me
from
the
vacuum

con
troller

3
Mark
the

pOSItIon
of
the
distrIbutor
relative

to
the

housmg
remove
the
bolts
and
lIft
the

dIstrIbutor

off

4

Take
off
the
vacuum
controller
as
shown
m

F1gDre
S9

@

J

I

v

o

o
o

o

5
Remove
the
contact

pOInt
assembly
as

pre

VIously
descnbed

6
Remove
the

c01Jtact
breaker

assembly
Figure

60

by

remOVIng
the

clIps
that

hold
It
m

place

Be
careful

not
to
lose
the
steel
balls
located
be

tween
the
breaker

plate
and
breaker

springs