DATSUN B110 1973 Service Repair Manual

9HORN
r
I

01

8ATTERY

HI

IGI

s

ILl

C
iORN
BODY

FUSE
H

S
HORN
BUTTON

BGI

J
H

B
S

Il

I
n6lm

I

L
J
L

HORN
RELAY

Fig
BE
3l
Circuit

diagram
for
hom

syrtem

HORN

Removal

Remove
the
connector
loosen
the

fixing
nut
in
the

horn
center
and

remove
the
horn

unit

Adjustment

1

Secure
the

horn
unit
in
a
vise

and
connect
cables
as

shown

in

Pigure
BE
32

AMMETER
110
to
15AI

Isw
f

@

113
I

VOLTMETER

I

15
to

20VI

BATTERY
HORN

Fig
BE
32
Circuit

for
ham

adjustment

2
Set
the

switch
to

ON
and
rnake
sure
that
the

voltmeter
indicates
12
to
12
5

V

3

Listening
the
horn
for
sound
level
volurne

and
tone

adjust
sound

properly
so

that
the
amrneter
indicates
the

rated

amperage
The

adjustment
is

made

by
turning
the

adjust
screw
after

loosening
the
lock
nut
Fig
BE
33

Adjusting
hom
IIOlume

Note
When
the

adjust
screw
is
turned

Clockwise

Counterclockwise
Current
increases

Current
decreases

4

When
a

proper
sound
is

obtained

through
the
above

adjustment
rnake
sure
that
the

proper
sound
can
be

obtained
at

voltage

generated
by
the
alternator
14
to

l5V

5
Lock
the

adjust
screw
with
the

lock
nut

Consumed
current

adjusting
value
A

Sound

Plat

type
Spiral
type

High
H
2
5
390
5

0
440

Low

L
2
5

330
5
0
350

Figures
encircled
in

parenthesis
are
basic

frequencies

Hz

BE

16

BODY
ELECTRICAL

TROUBLE
DIAGNOSES
AND

CORRECTIONS

Condition

The
horn

does

not

operate

The
horn
sounds

continuously

Reduced
volume

and

or
tone

quali

ty
Probalbe

cause

Excessively
discharged

battery

Blown
off
fuse

Improper
horn

button
contact

Defective
horn

relay

Defective

horn

Defective
horn

relay

Short
circuited
horn

button

and

horn

relay
terminal
S

Improper
fuse
wire
contact

Broken
cable

Improper
horn
button
contact
Method
of

inspection

Measure

specific
gravity
of
electro

lyte
Corrective

action

Charge
if

required

Check
the
fuse
for

fusing
and
im

Replace
fuse

proper
contact

The
horn
sounds

though
the
horn

relay
terrninal
S
is

grounded
Check
and

repair

horn
button

The
horn
sounds

though
the
horn

Replace
horn

relay

relay
terrninals
B
and

H
are

short
circuited

The
horn
does
not
sound

though

Replace
horn

the
horn

relay
terminals
B

and

H
are
short
circuited
and
the

porn
still
does
not
sound

though

the

battery
terminal
is
con

nected
to
the
horn
terminal
direct

ly

The

horn
does

not

stop
though
the

Replace
horn

relay

horn

relay
S
terminal
is

discon

nected

When
the
horn

stops
through
the

above
disconnection
check
the

horn
button
unit

particularly
care

fully

BE

17
Repair
horn

relay

terminal
S

Replace
horn

button

Correct

Repair
or

replace
if

required

Repair

d

BODY

METERS
AND
GAUGES

CONTENTS

CLUSTER
LID

Oescri

ption

Removal

SPEEDOMETER

Replacement

FUEL
GAUGE

AND

TEMPERATURE
GAUGE

Description

Replacement
BE
1B

BE
18

BE
18

BE
19

BE
19

BE
19

BE
19

BE
20

CLUSTER
LID

Description

The

cluster
lid
holds
various
rneters

indicators
and

clock
located
around
the

speedorneter
Printed

circuit

board
is

used
at

the
back
of
the

meter
as
shown

in

Figure

BE
38

and
the

printed
circuit

board
is

connected
with

multiple
connectors
Thus
the
meters

Can
be

inspected

and
serviced

extremely
easily
Except
for
the

speed

ometer
all

rneters
are

operated
electrically
The
fuel

gauge

and
therrnometer
are

very
reliable
and

they
are

equipped

with
bimetal
devices

F
a

o

ill
I

1

a

a

Fig
BE
34
Combination
meters

Removal

Disconnect
the

battery
terminal

depressing
the
OIL
PRESSURE
AND

IGNITION
WARNING
LAMPS

HAND
BRAKE
WARNING
LAMP

BULB
SPECIFICATIONS

TROUBLE
DIAGNOSES
AND

CORRECTIONS

Speedometer

Thermometer
and
fuel

meter

Oil

pressure
and

ignition
warning
lamps
BE
20

BE
21

BE
21

BE
22

BE
22

BE
23

BE
25

windshield

wiper
switch

lighting
switch
and
choke
lever

knobs

turn
them
counterclockwise
to

remove

Remove
the

escutcheon

2

Inserting
your
hand

into
back
of
the

cluster
lid

disconnect
the

cigarette
lighter
cable
and

turn
and

remove
the

cigarette
lighter
outer

case

3
Remove
the
radio
and
heater
control
knobs

4
Remove
the
shell

cover
from
the

steering
tube

loosen
the

screws
used
to
secure
the
meter

housing
to
the

instrument

panel
and

remove
the
cluster
lid

5
Pull
out
the
l2

pole
round

shape
connector
and

remove
the

speedometer
cable
union

nut

6
Remove
the

cluster
lid
from

the
instrument

panel

Fig
BE
35

Removing
clllSter
jd

BE
18

BODY
ELECTRICAL

SPEEDOMETER

The

speedometer
is

equipped
with
a
total
odometer

which

records
travelled
distance

Replacement

1

When

removing
the

speedometer
remove
the
cluster

lid

first

Separate
the
combination
meter

housing
from
the

cluster
lid
after

removing
four
screws
and
remove
the

trip

recorder

reset
knob
if

any

2
Unscrew

two
screws
and
remove

the

speedometer

from
the
combination
meter

housing

3

Reinstall
a
new

speedometer
in

reverse

sequence
of

removal

Fig
BE
36

Removing
combination
meter

o

Fig
BE
37

Removing
sp
edometer
FUEL
GAUGE
AND

TEMPE

RATURE
GAUGE

Description

The
fuel

gauge
consists

of
a
tank
unit

located
in
the

fuel
tank

and
fuel
meter
The
tank
unit

detects
fuel
level

with
its

float
converts
fuel
level
variation
to

a
resistance

of
slide
resistor

installed
on
the
float
base

and
thus

controls
current

flowing
to
the
fuel
meter

The

temperature

gauge
consists
of

a
thermorneter
and

thermal
transmitter
located
in

the

engine
block
The

thermal
transmitter
is

equipped
with
a
thermistor
element

which
converts

cooling
water

temperature
variation
to
a

resistance
and
thus
the
thermal
transmitter
controls

current

flowing
to
the
thermometer

The
fuel
rneter
and
thermometer
are

provided
with

bimetal
a
and

heater
coil
When
the

ignition
switch
is

set
to
ON

current
flows
to
the
heat

coil
and
the
heat

coil
is

heated
With

this
heat
the
bimetal
arm
is

bent
and

thus
the

pointer
connected
to

the
bimetal

ann
is

operated

The
characteristics
ot
both

meters
are
same

A

tolerance

may
occur
on
the

thermometer
or

fuel

gauge
due
to

source

voltage
fluctuation
The

voltage

regulator
is
used
to

supply
a
constant

voltage
so
that
the

therrnorneter
and
fuel

gauge

operate
correctly
The

voltage
regulator
is
built
in
the
thermometer

The

operating
part
of
the

regulator
consists

of
a

bimetal
arm
and
a
heater
coil
When
the

ignition
switch
is

turned
on
the
birnetal
arm
is
heated
and
bent

by
the
coil

opening
the

contact

Consequently
current
to
the

coil
is

interrupted
As
the
bimetal

cools
the

contact
closes
The

repetition
of
this

operation

produces
a

pulsating
voltage

of
8V
which
is

applied
to

the

ternperature
and
fuel

gauges

If

both
thermometer
and

fuel
meters

become
defective

at
the

same
time

this

may
be
attributable
to
trouble
in

the

voltage
regulator

BE
19

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

BODY

Speedometer
TROUBLE
DIAGNOSES
AND
CORRECTIONS

Condition

The

speedorneter
pointer
and

odometer
do
not

operate

The

speedorneter
pointer
de

flects

widely

Unstable

speedometer
pointer

Unusual
sound
occurs
in

re

sponse
to
increase
of

driving

speed

Inaccurate
speedometer
indi

cation

Inaccurate
odometer

operation
Probable
cause

Improperly
tightened
speedometer
cable
union

nut

Broken

speedometer
cable

Damaged
speedorneter
drive

pinion

Defective

speedorneter

Rapidly
bent

speedometer
cable

Damaged
speedometer
drive

pinion
gear

Defective

speedometer

Irnproperly
tightened
speedometer
cable
union

nut

Defective

speedometer
cable

Defective

speedorneter

Excessively
bent
or
twisted

speedometer
cable

inner
wire
or
lack

of
lubrication

Defective

speedorneter

Defective

speedorneter

Irnproperly
meshed
second
and
third

gear
worm

gears

Faulty
feeding
due
to
deformed
odometer
and

pinion
carrier

BE
22
Corrective
action

Retighten
union
nut
cor

rectly

Replace

Replace
the
drive

pinion
gear

Replace

Correct
or

replace

Replace
the

pinion
gear

Replace

Retighten
union
nut

correctly

Replace
the
cable

Replace

Replace
the
meter
cable

Replace

Replace

Replace
the
meter

Replace
the
meter

BODY
ELECTRICAL

Thermometer
and
fuel
meter

Condition

Both
therrnorneter

and
fuel
rneter
do

not

operate

Both
thermorneter

and
fuel
rneter

indicate
inaccu

rately

Thennometer
Probable

cause

Blown
off
fuse
or

improper
coo

nection

Defective

voltage
regulator
Dam

aged
fused
or

open
contact

Defective

voltage
regulator
Bro

ken
heat
wire

seized
contact
and

or

improper

grounding

Improper
cable
contact

The
thermometer
Defective
thermal
transmitter

does
not

operate

Defective
thermometer

The

pointer
indi
Defective
thermal
transmitter

cates
maximum

temperature

Defective
thermometer
Method
of

inspection

Check
the
fuse
for

fusing
and

improper
contact

Meter

operates
excessively

Meter

operates
slightly

The

pointer
deflects
when
ther

mal
transrnitter

yellow
white

ca

ble
is

grounded

The

pointer
does
not
deflect

when
thermal
transmitter

yellow

white
cable
is

grounded

The

pointer
moves
to
the
low

limit

when
the

ignition
switch
is

turned
off

The

pointer
indicates
maximum

temperature
even

after
the

ignitoD

switch
is

turned
off

BE
23
Corrective

action

Replace
after
cor

recting
the

cause
if

fused

Correct
coo

tact

The

voltage
regulator

is
combined

with
the

thermometer
to
a

single
unit

When
the

voltage

regulator
is

defective

replace
it

together
with
the

thermometer

Replace
together

with
thermometer

Check
the

cable
be

tween
fuse
and
meter

for

improper
contact

and

repair
if

required

Replace
the
ther

mal
transmitter

Replace
the
ther

mometer

Replace
the

ther

mal
transmitter

Replace
the
ther

mometer

The
thermome

ter
does
not

operate
accu

rately

Fuel
meter

Fuel

meter
does

not

operate
Defective
thermometer

Defective
thermal
transmitter

Improper
cable
contact

Defective
tank
unit

Defective
fuel
meter

The

pointer
indi
Defective
tank
unit

cates
Full

po

sition

Fuel
meter

fune

tions

improperly
Defective
fuel
rneter

Defective
tank
unit

Defective
fuel
rneter
BODY

The
thermometer
is
serviceable

when
a
100
n
resistance
is

ap

plied
to
the

thermal
transmitter

yellow
white

cable
the
cable
is

grounded
and
the
thermorneter

indicates

approximately
500C

1220F

When
the
thermometer
is
normal

through
the
above

inspection

The
thermometer

indicates

a

temperature
slightly
lower
than

the
actual

temperature

The

poin
ter

tank
unit

grounded
deflects

yellow
when
the

cable
is

The

pointer
does
not

deflect

through
the
above

inspection

The

pointer
lowers
below
the

ernpty
limit
when
the

ignition

switch
is

turned
off

The

pointer
still

indicates
Full

position
through
the

above
in

spection

The

pointer
indicates
a
half
level

when
a
35
n
resistance
is

applied

to
the
tank
unit

yellow
cable
and

the
cable
is

grounded

The

pointer
does

not
indicate
a

half
level

through
the
above
in

spection

BE
24
Replace
if
defective

Replace
the

therrnal

transmitter

Check
the
cable
from

the
thermometer
to

the
thermal
trans

mitter
for
cable

being

about

to
break

poor

contact
and

faulty

grounding
and

repair

as

required

Replace

unit
the
tank

Replace
the
fuel
me

tee
with
a
new
one

Replace
the
tank

unit

Replace
the
fuel
me

ter

Replace
if
defective

Replace
the
fuel

meter

BODY
ELECTRICAL

Improper
cable
contact

Oil

pressure
and

ignition
warning
lamps

Condition

Oil

pressure
Want

ing
lamp

The

lamp
does
not

ligh
t
when
the

ignition
switch
is

set

to
ON
Probable

cause

Blown
off

fuse
or

faulty
contact

Broken

lamp
bulb
fIlarnent
or

faulty
cable
contact

Defective
oil

pressure
switch

The

lamp
does
not
Oil

pressure
is

too
low

go
out
while
the

engine
is

being

operated
Lack
of

engine
oil

Defective
oil

pressure
switch

Ignition
warning

lamp

The

lamp
does

not

light
when

the

ignition

switch
is
set
to

ON
Blown
off
fuse
or

faulty
contact

Burnt
out

light
bulb
filarnent
or

faulty
cable
contact
The
fuel
rneter
indicates
a

level

slightly
lower
than

the
actual

level

Method
of

inspection

Check
the

fuse
for

fusing
and

faulty
contact

The

warning
lamp
does
not

light

when
oil

pressure
switch

yellow

black
cable
is

grounded

The

warning
lamp
lights
through

the

above

inspection

Inspect
the

engine
oil

pressure

system

Check
oil
level

Continuity
exists
on
the
oil

pres

sure
switch
when
the

engine
is

being
operated

Check
the
fuse
for

fusing
and

faulty
contact

The

pilot

lamp
does
not

light

when
the

voltage
regulator
con

nector
is
disconnected
the

white
red
cable
is

grounded
and

the

ignition
switch
is
set
to
ON

BE
25
Check
the
cable

from

the

fuel
meter
to
the

tank
unit
for

cable

being
about
to
break

poor
contact
and

faulty
grounding
and

repair
as
required

Corrective

action

Replace
after
corree

ting
the

fuse
the

cause
if
fused

Check
the

light
bulb

for
burnt
out
fIla

ment
and

replace
as

required

Replace
the
oil

pres

sure
switch

Add
oil

Replace
the
oil

pres

sure
switch

Repair
or

replace
as

required

Check
the
bulb
for

burnt
out
fIlament

and

replace
as
re

quired