1973 DATSUN B110 Engine diagram

BODY
ELECTRICAL

WIRING

CONTENTS

WIRING
HARNESS

Engine
compartment
harness

I
nstrument
harness
BE
1

BE
1

BE
2

WIRING

HARNESS

The

wiring
harness
is
classified
into

engine
compart

ment
harness
instrument
harness
and

body
harness
The

individual
harness

Jocating
positions
and

connecting

Position
e
w
the

individual

wiring
harnesses
are

indicated
a
f
Moreover
for
the

body
harness
the

installing
positioJ
differ

mutually
in

Sedan

Coupe

Station

wagon

and
yan

Engine

compartment
harness

Fig
BE
1

Engine
compartment
harness
1
Body
harness

WI
RING
DIAGRAM

INSPECTION
BE
2

BE
4

BE
6

A
0

Ij

7
9

Fig
BE
2

Engine
compartment
harness
2

Fig
BE

3

Engine
compartment
harness
3

BE
1

INSPECTION

Referring
to
the

wiring
diagram
check
the

wiring

harness

for
connection
with
electrical

equipment
and

connector
for
conned
ion
and
installation
When

checking

the

wiring
harness

note
the

following
matters

Connected
unit
should

not
be

loose
rusted
or

contaminated

2

Cable
insulator
cover
should
not
be

damaged
crack

ed
or

insulating
material

should
not
be
deteriorated

3
For
those

parts
which

are

grounded
through
the

installation

bolts
the
bolts
should
be
in
contact
with
the

body
completely
so
that

continuity
is

provided
in

between
the

body
and
bolts

4
Terminals

of
unit

through
which

current
flows

should
not
come

into
contact
with

other
metal

parts

5
No

erroneous
connection
should
be

present

DESCRIPTION

When
an
overcunent

exceeding
the
rated

amperage

flows
to
a
circuit
the

fuse
is
heated
and
melted
the

circuit
is

interrupted
and

thus
cables
and

electrical

equipment
are

protected
from

damaging
due
to

burning
or

damaging
is

limited
to
the

minimum
This
vehicle

is

equipped
with
six

fuses
and

one
fusible
link
The
fuses

are

located

in
the

fuse
box
and
used

to

protect
illumination

signal
and
other

systems
and
the
fusible
link
is

adopted

in
the
cable
between
the

battery
and
alternator
to

protect

the

charging
and

starting
circuits

FiJ
BE
16
Fuse
box
BODY

6
Cables
should
be

damped
so
that

they
do
not
come

into
contact
with

sharp
corner
or

part
lernperature
of

which

rises

highly

7
Cables
should
be

securely
clamped
in

posItions

sufficiently
separated
from

rotating
parts
such
as
fan

pulley
fan
belt

etc

8
Cables
should
be

provided
with
an

optimum
extra

length
at
sections

stationarity
on
the

body
or
at
sections

where
vibration

occurs
due
to

engine
operation
and

others

Note
a
When

inspecting
or

performing
other
mainte

nance

service
and
no

power
supply
is

required

particularly
or
when
it
is

anticipated
that
a

part

may
be
short
circuited
disconnect
the

battery
H

terminal

b
In
no
event
should
an
unloaded
circuit
be

directly
connected
with
ground
Be
sure
to
use
a

test

lamp
or
circuit

tester

fUSE

Fig
BE
17
Fusible
link

INSPECTION

In
the

most

cases
fuse
can
be

checked

visually

However
when

it
is
difficult
to

check

visually
a
circuit

tester

may
be
used

The
fusible
link
can

be

inspected

visually
or

by

feeling
on

finger

tip
However
the
fusible

link
can
be

inspected
more

correctly

by
using
a
circuit

tester

BE

6

BODY

REGULATOR

FUSE
M

TEMPE

RATURE

GAUGE
IGNITION

SWITCH

Lf

I

iT
Ji
1M

THERMAL
TRANSMITTER
I

J

0

I
GAUGE
TANK
UNIT

FUEL
TANK

Fig
BE
38
Circuit

diagram
for
fuel
gauge
temperature
gauge
and

voltage

regulator

Replacement

Remove
the

cluster
lid
first

2
Unscrew
two

screws
and
remove
the

thermometer
or

fuel
meter

from
the

combination
meter

housing

3
Reinstall
a
new
meter
in

reverse

sequence
of
removal

Fig
BE
39

Removing
thermometer

OIL
PRESSURE
AND

IGNITION
WARNING
LAMPS

The

engine
lubricating

system
incorporates
an
oil
pressure

warning
lamp
which

glows
whenever

engine
oil

pressure
falls
below
0
4

kg
ern
to
0
6

kg
em
5
7
to
8
5

lb

sq
in

When
the

engine
is

stationary
the

light
glows
with
the

ignition
switch
turned
on
When
the

engine
is

running
and

the
oil

pressure
reaches
the

circuit
is
broken
and
the

light

goes
out

J

u

fj
Warning
lig

2
Fuse

bSM
Q

f

t

J

without

pressu
re
with

pressure

Fig
BE
40
Circuit

of
oil

pressure
warning
system

Ignition
warning
lamp
glows
when
the

ignition
switch

is
set
to
ON
and
the

engine
is
not

operated
or
when
the

generator
fails
to

charge
with
the

engine
operated

BE
20

BODY
ElECTRICAL

When
the

ignition
switch
is
set
to
ON
the

ignition

wa

rning
circuit
is

closed
and
current
flows
flows
from
the

ignition
switch
to
the

warning
lamp
bulb

and

ground

through
the

regulator
When
the

engine
is
started
and
the

generator
comes
into
operation
the

generator
output

current

opposes
the
current
flowing
from
the

warning

lamp
in

effect
it
breaks
the

warning
circuit

ground

connection
and
the

lamp
goes
out

l

r

hffi
u

z
Ignition
switch

I
Q
6

I
0

c

M
1
E

8

ca
i

L

g

PI
lot
c

P

I

j

co

rt
0

relay
E
0

5

y
y
1

N
N
3

Alternator

Regulator

Fig
BE

41
Circuit

of
ignition
warning
system

HAND
BRAKE
WARNING
LAMP

This

lamp
functions
both
hand
brake

warning
larnp
and

BULB
SPECIFICATIONS
service
brake
line

pressure
differential
warning
lamp

When
a

difference
between
front
and

rear
brake
line

pressures
reaches
the
rated

range
13
to
17

kgfcm2
185

to

242
lb

sq
in
the

ground
circuit
for
the

warning
lamp

is

closed
and
the

warning
lamp
lights

IGNITION
SWITCH

WARNING

LAMP

L
E

WARNING

SWITCH

1
SERVICE

BRAKE
LINE

PRESSU
R
E

DIFFERENTIAL

WARNING

J
SWITCH

Fig
BE

42
Circuit

diagram
for
brake

warning

system

tern
Specifications

Square

type
meter
Round

type
meter

Meter
illumination

larnp
VoW
12
3
4
2
12

1
7
3

Turn

signal
pilot
lamp
VoW
12
3
4
2
12
1
7
2

Head

lamp
main
high
beam

VoW
12
3
4

I
12

17
1

pilot
lamp

Ignition
warning
lamp
VoW
123
4

I
12
17
1

Oil

pressure
warning
lamp
VoW
12
3
4

1
12
1
7

1

Hand
brake

warning
lamp
VoW
12
1
7
1

for
U
S
A

CANADA

Clock
illumination

lamp
VoW
123
4
I
12
17
2

Figure
encircled
in

parentheses
indicates
number
of
bulbs
used

BE
21

The

lamp
does

not

go
out
when

the

engine
is

started
Faulty
charging
system
BODY

Inspect
the

charging

system

WINDSHIELD
WIPER
AND

WASHER

Description

Wiper
motor

replacement

Wiper
blade

operating
range
CONTENTS

BE
26

BE
27

BE
27

Description

The
windshield

wipers
consist

of

wiper
motor
link

mechanism

wiper
arms
and

blades
The

wiper
motor

unit

consists
of

a
motor
and
auto

stop
mechanism
The

wiper
rnotor
is

of
a
2
speed

type

When
the

wiper
switch
knob
is

pulled
to
the
I

st

step

the
windshield

wipers

operate
at

low

speed
and
when

pulled
to
the
2nd

step
operate
at

high
speed

The

wiper
motor
unit
is

located
on

the
cowl
dash
in

BATTERY

Cl

WIPER

MOTOR

rrQ

J
WASHER
MOTOR

IB

ILRI

L
CJ

LA

t
Y

I
Ll

j

IBI

1
f
I

LW

I
Wiper
washer
switch

replacement

Washer
nozzle

adjustment

TROUBLE

OIAGNOSES
ANO

CORRECTIONS
BE
27

BE
27

BE
28

the

engine

compartment
and
the

link
mechanism
is

located
behind
the

instrument

panel

The

electrically
operated
windshield
washer
consists
of

washing
fluid
lank

with

rnotor
and

pump
washer

nozzles

and

vinyl
tube
used

to

connect
those

compo

nents

The

windshield
washer

switch
is

combined
with

the

windshield

wiper
switch
to
a

single
unit

When

operating

the
washer

twist
the

switch
knob

IG

FUSE

W

v

l

i

f
WIPER
SWITCH

10FFI
I
2

I
TWIST

I

y

ILl

I

b

I

J
6

I
BLII

Fig
BE
43
Circuit

diagram
for
windshield

wiper
washer

system

BE

26

EMISSION
CONTROL
AND
TUNE
UP

The
thermo
switch
is
screwed
on
the

dash
side

panel

RH
The
bi
metallocated
in
the

thermo
switch

prevents

the
flow
of
electric

current
when
the

temperature
is

below

the

specifications
and

thus
ensures
a

proper
running

performance
immediately
after

starting
the

engine
in
cold

weather

A

Fig
ET
30
Thermo
switch
installation

A
view

I

llf

F

ID

1
Note
Operation
of
the
thermo
switch
is

hysteresis
of
the

bi
metal
It

opens
between
50C

410FI
and

130C

550
F
when

temperature
rises
from
low
to

high
It

closes
above
lOC

34
0
F
when

temperature
lows

from

high
to
low

An
orifice
is

employed
in
the

vacuum
hose

connecting

the
carburetor
and

tee
to
restrict
the
air
flow

by
passing

the
carburetor
when
the
needle
valve

opens
and
air
is

freely
introduced

through
the

vacuum
hose

1
Flow

guide
valve

2
Orifice

3
Vacuum

cutting

valve

solenoid

r

d

01
DATSUN

Fig
ET
31
Vacuum

tube

diagram

Checking
electrical
advance

control

system

Disengage
the

clutch
and
race
the

engine
at
normal

ambient

temperature
if
ambient

temperature
is
low

warm

up
the

engine
and

pull
off
the
vacuum
hose
from

the
distributor

Through
this

vacuum
hose

if
vacuum
is
felt
at
the

top
gear
position
and
is
not
felt
at
other

positions
it
is

satisfactory

It
is

correct
if
vacuum
is

always
felt
at
low

tempera

tures
below
l30C
550F

before
the

engine
is
warmed

up

ET
19

ENGINE

CAMSHAFT
AND
CAMSHAFT

BEARING

Measuring
camshaft

bearing
clearance

Measure

inner
diameter
of
the
camshaft

bearing
and

outer
diameter
of
the

camshaft

journaL

If
camshaft

bearing
clearance
is
excessive

replace
the

cylinder
block

assembly

Limit
0
15mm
0
0059
in

Standard
o
oi
to
0
07mm

M012
to
0

0627
in

Fig
EM
42

Camshaft
bearing
check

1st

2nd

Oil

clearance

mm
in
3rd

4th

5th

1st

Inner

I
2nd

I

diameter
of

I

I
camshaft

3rd

bearing

mm
in

14th
I

15th
I
Standard

0
037

to
0
060

0
0015

to
0
0024

0
027
to
0

050

0
00

to
0
0020

0
040
to

0
063

0
0016
to
0

0025

0
027
to

0
050

0
0011
to

0
0020

0
037
to

0
060

0

0015
to
0
0024

43
833
to
43

843

i

7257
to
I
7261

43
323

to
43
333

l
7050
to
1
7060

42
836
to

42
846

1

6865
to
1
6868

42
323

to
42
333

1
6663
to

1
6667

41
258
to
41
268

1

6243
to

1
6247
Wear
limit

0
15

0
0059

1

1

1

1
Valve

timing

If

the
camshaft
has

no
apparent
damage
although
some

valve
troubles
have
been
detected

compare
valve

timing

data
with

the
valve

timing
diagram
to
ensure
that

beginning
and

ending
of
stroke
for
all

cylinden
are

complying
with

specified
advance
and
retard

figures

T
D
C

DIRECTION
OF

ROTATION

INTAKE

B
D
C

Fig
EM
43
Valve

timing
diagram

Unit

degree

a
b
e
f
d
c

248
248
14
54
12

56

Checking
camshaft
for

bending

Check
the
camshaft
camshaft

journal
and
cam

surface
for
bend
wear
or

damage

If
defective
condition
exceeds
the
limit

replace
the

defective

part
s

2

Apply
a
dial

gauge
to
the
center

journal
turn
the

camshaft
and
read
the
dial

gauge
Actual

bend
is
a

half
of

the
value
indicated
on
the

dial

gauge

Standard
Bend
limit

Camshaft
bend

mm
in
0
015
0
0006
0
05
0
0020

EM
14

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