1973 DATSUN B110 check engine

ENGINE

ElECTRICAL
SYSTEM

IGNITION
CIRCUIT

The

ignition
circuit
consists
of

the

distributor

ignition
coil

ignition
switch

spark
plugs
high
tension
cable
and
the

battery
Figure
EE
57

shows

ignition
circuit

8
I

CC

BATTERY

PRIMARY

COIL

SlO

Lf

IGNITION

SECONDARY

COIL

COIL

BREAKER
POINT

jJ
a

w

CI

Z

w

19

DISTRIBUTORI
U
1Fl
r

lB

S

J1G

TO

STARTER

CAP

ROTOR

HEAD

SPARK
PLUG

7

Fig
EE

57

Ignition
system
circuit

diagram

DISTRIBUTOR

CONSTRUCTION

CHECKING

AND
ADJUSTMENT

Cap
and
rotor
head

Point

Condenser

Centrifugal
advance
mechanical

part

Vacuum
advance

mechanical

part
EE
29

EE
31

EE
31

EE
31

EE
31

EE
31

EE

32

CONSTRUCTION

The
distributor
consists
of

high
tension

voltage
part

switch
off

part

centrifugal
advancing
angle
part
vacuum

advance
mechanical

part
and

driving
part
CONTENTS

DISASSEMBLY
AND
REASSEMBLY

Disassembly

Reassembly

SPEC

IFICATIONS
AND
SERVICE
DATA

Specifications

Service
data
EE

33

EE
33

EE
34

EE
35

EE
35

EE

35

Figures
EE

58
and
S9

show
the

construction
and

exploded
view

EE
29

ENGINE
ElECTRICAL
SYSTEM

CHECKING
AND

ADJUSTMENT

Cap
and
rotor
head

Cap
and

rotor
head

must

always
be

kept
clean
to

maintain

good
insulation

durability
since

high
tension

voltage
from

ignition
coil
is

imposed
on
them

Sometimes

inside
of

the

cap
and

rotor
head
is
covered
with
fine

carbon

particles
and
dust
Whenever
crack
or

trace
of

leakage
is

found

on
the

cap
replace
with
a

new
one

Recommend
the
rotor
head

also
be

replaced
with
a

new

one
if

excessively
damaged

Point

When

point
surface
is

roughened
due
to

burning
polish

with
a
fine

emery
paper
No

500
or
600

or
oil
stone

When

the

point
is

worn

excessively
replace
When
the

point
is

replaced
with
a
new
one

apply
grease
to
the
arm

pivot
receiver
and

earn
surface
For
causes
of

damaged

burnt

point
improper
point
contact
insufficient

point

gap
and
defective
condenser
are

considered

The
standard

point
gap
is
0
45
to
0
55

mm
0

0177
to

0
0217
in
When

gap
is
deviated
from
the

standard

gap

adjust
Turn
the
shaft
to
a

position
where
the
breaker
arm

heel
rides
the
com

lug
a

position
where

point
gap
is

maximum
loosen
the

gap
adjusting
screw

apply
a

thickness

gauge
between

contacts
and

adjust
to
the

standard

point
gap

Fig
EE
60

Adjusting
point
gap
When

measuring
breaker

point
spring
tension

apply

spring
tension

gauge
to
the
breaker

point
and

position
the

spring
tension

gauge
in

right
angle
against
the
breaker
arm

The
standard

breaker

point
spring
tension
is
0
5

to
0
65

kg
1
1
to
I
4Ib

Replace
if
deviated

Fig
EE
61

Measuring
breaker

point
spring
tension

Condenser

Performance

of
condenser
is

affected

by

improper

setting
contamination
and

reduction
of
insulation

re

sistance
Thus

periodical
checking
is

required
to
maintain

the
outlet
of
lead
wire
clean
and

to

prevent
set
screw
from

loosening
Checking
the

condenser

capacity
is

checked

using
a

capacity
meter
It

may
be

also
checked
condenser

isolate
resistance

using
a
tester

by

adjusting
its

range
to

measure

large
resistance

value

When

the
condenser
is
normal
the

tester

pointer

swings
largely
and

rapidly
and
moves

gradually
back
to

the
infinite

side
When
the

pointer
does

not

stay
still
or
it

points
Zero
in
resistance

replacement
is

necessary

Centrifugal
advance
mechanical

part

When
cause
of

engine
trouble
is

traced
to

centrifugal

advance
mechanical

part
use

distributor
tester
to

check

its
characteristics

EE
31

ENGINE

When

nothing
is

wrong
with
its

characteristics
con

ceivable

causes
are
defectiveness
or
abnormal

wearing
of

driving

part
or
others
Do

not
disassemble
it

When
characteristics
are

improper
check
earn
as

sembly
governor
weight
shaft
and

governor
spring
and

other
relative

parts
carefully

When

reassembling
the

centrifugal
advance
mechanical

part
be

sure
to
check

advance
characteristics

by
the
use

of
a
distributor
tester

Centrifugal
advance
characteristics

1

c

1

Ei
12

L

o

V

o

u

c

o

o

t

D

c

s

151

14

e

101

0

81
V

0

u

c

51
0

41
t

0

Q
2

01

0
I

I
I
1

rj

11

50

I

J
2
100

50
oQ
5

00

400

800
1
200

1
600
2

00

Distributor
RPM

Fig
EE
62
D412

80formanual
transmission

I
I
I

2
350
13
50

1

1

1
300

1

1

550
00

h
6
0
0

I

400

800
1

200
1
600
2

000

Distributor
RPM

Fig
EE

63
D412
B9

faT
automata

transmission
2
400

I

11
50

2
400

EE

32
Vacuum
advance
mechanical

part

Vacuum
ad
ance
characteristic

12

I

I

I

I
I

II1
5515
5Q

i

01
40

00

i1j
50
00

1

I

o
50
100
150
200
250
300
350
400
450

500
550

21
41
6
8

101
C121
141
161
181

201
22

V2Icuum

mmHg
inHg
I
I
I

I

7

50
1
1Q

Ii

V
I

o
0

u

i
e
6

tI
2

o

i5

0
235

Fig
EE
64
D412
80

for
manual
transmission

c

1

0

I
o

9i
8

o

u

0

i

61
0

0

0
4

o

Q

2

I
I
I

450
x
70

L
H

1
500

501

287
00

l
320
oJ

I

I

200250300350400450500550

IS
101
1121
t4

16
16
1201
22

Vacuum

mmHg

OnHg
o

50
100
150

2
141
161

Fig
EE
65
0412
89

for
automatic
transmission

The

following
causes
are
considered
for

impropeI

opera
tion

I

Leakage
of
air
due
to

incomplete
fastening
of

vacuum
inlet

ENGINE
ElECTRICAL
SYSTEM

SPECIFICATIONS

Make
and

type

Primary
voltage
v

Spark

gap
mm
in

Primary
resistance

at
200C
680

F
n

Secondary
resistance

at
200C
680F
Kn

External
resistor

at
200C
680
F
n

Applied
resistor
HANSHIN
HITACHI

H5
15
2
C6R
601

12
12

more
than
7

more
than
7

0
28
0
28

1
17
to
I
43
l
l
7

to
I
43

11
2
to
16
8
11
2

to
16
8

l
3tol7
l
3tol7

RC
15
5560R
151O

SPARK
PLUG

CONTENTS

DESCRIPTION

INSPECTION

CLEANING
AND

REGAP
EE
37

EE
37

EE
38

DESCRIPTION

The

spark
plugs
are
of
the
resister

type
having
14
mm

0
551
in
threads
and
0
8
to
0
9
mm
0
031
to
0
Q35
in

gap

Note
All

spark
plugs
installed
on
an

engine
must

be
of

the

same
brand
and
number
of
heat

range

INSPECTION

1
Remove

spark
plug
wire

by
pulling
on
boot
not
on

wire
itself

2
Remove

spark
plugs

3

Check
electrodes
and
inner
and
outer

porcelains
of

plugs
noting
the

type
of

deposits
and
the

degree
of

electrode
erosion

Refer
to

Figure
EE
74

Normal
Brown

to

grayish
tan

deposits
and

slight
elec

trode
wear
indicate
correct

spark

plug
heat

range
SPECIFICATIONS
AND

SERVICE
DATA

TROUBLE

DIAGNOSES
AND

CORRECTIONS
EE
38

EE
39

Carbon
fouled

Dry
fluffy
carbon

deposits
on
the

insula

tor
and

electrode
were

mostly
caused

by
slow

speed

driving
in

city
weak

ignition
too
rich
fuel
mixture

dirty
air

cleaner
etc

H
is

advisable
to

replace
with

plugs
having
hotter
heat

range

Oil
fouled
Wet

black

deposits
show

excessive
oil

en

trance
into
combustion

chamber

through
worn

rings

and

pistons
or
excessive

clearance
between

valve

guides

and

stems
If
the
same

condition
remains

after

repair

use
a

hotter

plug

Overheating
White
or

light
gray
insulator
with
black

or

gray
brown

spots
and

bluish
burnt
electrodes
indicate

engine

overheating
Moreover
the

appearance
results

from
incorrect

ignition
timing
loose

spark
plugs
low

fuel

pump
pressure
wrong
selection

of
fuel
a

hotter

plug
etc

H
is
advisable
to

replace
with

plugs
having
colder

heat

range

EE
37

ENGINE

Overheating

Normal
Carbon
fould

Fig
EE
74

SpaTk
plug
Life

4

After

cleaning
dress
electrodes
with
a

small
fine
fIle

to
flatten
the
surfaces
of
both

center
and
side
electrodes

in

parallel
Set

spark

plug
gap
to

specification

5

Install

spark
plugs
and

torque
each

plug
to
1
5

to
2

0

kg

m
ll
to
15
ft
lb

6
Connect

spark
plug
wires

CLEANING
AND
REGAP

Clean

spark
plugs
in
a

sand
blast

type
cleaner
Avoid

excessive

blasting
Clean
and
remove
carbon

or
oxide

deposits
but
do
not
wear

away

porcelain
If

deposits
are

too
stubborn
discard

plugs

Mter

cleaning
spark

plugs
renew

firing
surface

of

electrodes
with
me
mentioned
above
Then

gap
spark

plugs
to
0
8
to

0
9
mm
0

030
to
0
035

in

using
a
round

SPECIFICATIONS
AND
SERVICE
DATA

Make

Model

Size
Screw
dia

x
Reach

mm
in

Plug
gap
mm
in

Tightening

torque
kg
m
ft
b

EE
38
wire

feeler

gauge
All

spark

plugs
new
or
used
should
have

the

gap
checked
and
reset

by
bending
ground
electrode

Fig
EE
75

Setting
spaTk
plug
gap

NGK

HITACHI

BP5ES
1A6PW

14
x

19
0
55
x
0

75

0

8
to
0

9
0
031
to
0
035

1
5
to

2
5
11
0
to
15
0

ENGINE
ELECTRICAL
SYSTEM

TROUBLE
DIAGNOSES

AND

CORRECTIONS

When

engine
does
not

start

If
there
is
no
trouble
in
fuel

system

ignition
system

should
be
checked
This
can
be

easily
done

by
detaching
a

high
tension
cable
from

spark
plug
starting
engine
and
observing
condition
of

spark
that
occurs
between

high

tension

cable
and

spark
plug
terminal
After

checking
this

repair
as

necessary

Length
of

Trouble
location
Cause
Remedies

spark
gap

No

sparks
at
all
Distributor

Defective
insulation
of
condenser

Replace

Breakage
of
lead
wire
on
low
tension
side

Repair

Defective
insulation
of

cap
and

rotor
head

Replace

Point
does

not

open
or
close

Repair

Ignition
coil
Wire

breakage
or
short
circuit

of
coil

Replace
with
new

one

High
tension
cable
Wire

coming
off

Repair

Defective
insulation

Replace

I

to
2
mm

0
0394
Distributor
Point

gap
too
wide

Correct

to
0
0787
in

or

Oil

sticking
on

point
Clean

irregular

Point
burnt

too
much

Replace

Less
than
6

mm
Spark
plugs
Electrode

gap
too
wide
Correct
or

replace

0
2362
in

Too

much
carbon
Clean
or

replace

Broken
neck
of
insulator

Replace

Expiry
of

plug
life

Replace

2

When

engine
rotates
but
does

not
run

smoothly

In

this
case
there

are

many
causes
resulting
from
the

ignition
system
and

other

engine
conditions

not
related
to
ignition
Therefore
first

complete

inspection
of

ignition

system
should
be
carried
out

EE
39

CHASSIS

REMOVAL

The
clutch

assembly
is

dismounted

primarily
in
the

same
manner
as
the

engine
assembly
Thus
when
dis

mounting
the

clutch

assembly
refer
to
the
Section

TM

Transmission
Removal
and
other

relative
sections

W

II

11
I
Clutch

assembly

I
2

I
Clutch
disc

assembly

Fig
CIr2
Clutch

assembly
and
disc

assembly

DISASSEMBLY

When

separating
the
clutch

assembly
from
the

flywheel
loosen

and
remove
the
installation
bolts

diago

nally
and

gradually

Note
When

separating
the
clutch

assembly
from

the

flywheel
support
the
clutch

cover

sufficiently
and

loosen
the
installation
bolts

gradually
and

carefully

because
the

diaphragm
spring
tension
is

always

applied

2

Removing
release
mechanism

I
Remove

the
dust
cover
from
the
clutch

housing

2
Remove

the
return

spring
from

the

bearing
sleeve

and

separate
the
withdrawal
lever
from

the

bearing
sleeve

3
Remove

the
release

bearing
and

bearing
sleeve

from

the

front
cover
and
remove
the
withdrawal

lever
from
the

withdrawal

lever
ball

pin
1

I
Withdrawal

lever
3

Release

bearing

2
Return

spring

Fig
CL
3

Disassembling
release
mechanism

3
Withdraw
the

release

bearing
from
the

bearing
sleeve

by
the
use
of
a

bearing
puller

I
t

I
Release

bearing

I
2

I
Bearing
sleeve

Fig
CIr4

Withdrawing
rekas

b04ring

INSPECTION
AND

ADJUSTMENT

Thoroughly
clean
all

disassembled

parts
except
for

disc

assembly
and
release

bearing
and
check
them

for

wear

crack
and
other

defective
conditions

Clutch

assembly

I

Check
the
clutch
cover

diaphragm

spring
pressure

plate
etc
for
excessive

wear
crack
and

damage
When

noise

occurs
on
the
clutch

assembly
replace

CL
2

CLUTCH

Operating
cylinder
clutch

Operating
cylinder
diameter

T
Ilhtening
torque
19
05
mm
0
750
in

Clutch

assembly
securing
bolt
1
5
to
2
2

kg
m

10
8
to
15
9

ft
Ib

TROUBLE
DIAGNOSES
AND

CORRECTIONS

Condition

Noises
audible

on

pedal

depression

Noises
audible

on

pedal
release
Probable
cause

Excessively
worn

damaged
or

poorly
lubri

cated
release

bearing

Seized
release

bearing
and

diaphragm

spring

fingers

Insufficient

pedal
free
travel

Weakened

unhooked
or
broken
clutch

pedal

return
and
control

springs

Weakened
clutch
withdrawal
lever
return

spring
broken
or
unhooked

Excessive

play
between
clutch
disc
hub
and

drive
shaft

spline

Misalignment
of
clutch
disc
to

flywheel

causes

slight
movement
of

disc
hub
in

respect
of

facings

This
noise
is

especially
audible
with

engine

idling
or

at
low

speed

Broken
or
weakened
clutch
disc
cushion

springs

Insufficient

pedal
free
travel

Weakened
unhooked
or
broken
clutch
con

trol
and

pedal
return

prings

CL
13
Corrective
action

Replace
the

bearing
which

being
cased

cannot
be

greased
inside

Replace
the
release

bearing
Clean

diaphragm

spring
fingers
with
metal
brush
and
smooth

out

bearing
contact
faces
with
felt

polishers

Readjust
pedal
free
travel

correctly

Set

springs
in

position
or

replace
them
if

weakened
or

snapped

Replace
the

spring
or
hook
it

up
as

required

Replace
the
clutch
disc
and

ensure
that

clearance
between

hub
of
new

clutch
and

drive
shaft
is

within
0
50
mm
0

0197
in

endwise
and
0

20
mm
0

0079
in
crosswise

When
clearances
exceed
above
limits

replace

the
drive
shaft
also

Set
level
of
clutch
disc
with
clutch
disc
in

place
on

drive
shaft
set
it
under

slight

rotation
and
check
for
no
run

out

using
a

scriber

Replace
the
clutch
disc

Set

pedal
free
travel

correctly

Check
the

springs
for
correct

position
and

replace
them
if

necessary