1973 DATSUN B110 fuel pressure

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

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

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

EMISSION
CONTROL
AND

TUNE
UP

reading
cylinders
through
spark
plug
hole

Repeat

compression
check
on
these

cylinders

1

If

compression
improves
considerably

piston
rings

are
defective

2
If

compression
does
not

improve
valves
are

sticking

or

seating
improperly

3
If
two

adjacent
cylinders
indicate
low

compression

and

injecting
oil
on

pistons
does
not
increase

compres

sion
the

cause

may
be
a

cylinder
head

gasket
leak

between
the

cylinders
Engine
oil
and
coolant

in

cylinder
could
result
from
this

problem

Compression
pressure

12
S
to
14
S

kg
cm2

178
to

206

psi
at
3S0

rpm

Checking
exhaust
manifold
heat

control

valve

Check
heat

control
valve
for

proper
operation
If
it

does
not

operate
properly
trouble
is
due
to

excess
carbon

on
shaft
or

damaged
shaft
Clean
if

necessary
The
bimetal

should
be
also
checked
for

proper
function

IGNITION

AND

FUEL
SYSTEM

Checking

battery

Check

electrolyte
level
in
each

battery
celL

L

Unscrew
each

filler

cap
and

inspect
fluid
leveL
If

fluid

level
is

low
add

distilled
water
to

bring
level

up
to

app
roximately
10
to
20

mm
0

3937
to
0
7874
in
above

plates
Do
not
overfilL

2
Measure

specific
gravity
of

battery
electrolyte
ET002

Fig
ET
B

Checking
the

specific
gravity
of

battery
electrolyte

Permissible
Full

charge
value

value

at
200C
68OF

Frigid
climates
Over
1
22
1
28

Tropical
climates
Over
1
18
1
23

Other
climates
Over
L
20
1
26

Clean
the

top
of

battery
and
terminals
with
a
solu
lion

of

baking
soda

and
water
Rinse
off
and

dry
with

compressed
air

The

top
of

battery
must
be
clean
to

prevent
current

leakage
between
terminals
and
from

positive
terminal
to

hold
down

clamp

In
addition
to
current

leakage
prolonged
accumulation

of

acid
and
dirt
on
the

top
of

battery
may
cause

blistering

of

the
material

covering
connector

straps
and
corrosion

of

straps
After

tightening
terminals
coat
them
with

petro

laturn

vaseline
to

protect
them
from
corrosion

Checking
and

adjusting
ignition

timing

I

Check

spark

plugs
and
distributor
breaker

points
for

condition

2

Thoroughly
wipe
off
dirt

and
dust
from

timing
marks

on
crank

pulley
and
front

cover

3
Warm

up
engine
sufficiently

ET
5

ENGINE

Replacing
fuel
filter

Check
for
a

contamination
element
water
deposit
and

defection

Fig
ET
15
Fuel
strcrineT

All

engines
use
a

cartridge
type
strainer
If
it
is
found

to
be

defective

replace
as
an

assembly

Checking
fuel
lines

hoses

pipings
connections
etc

Check
fuel
lines
for
loose
connections
cracks
and

deterioration

Retighten
loose
connections
if

necessary

replace
any

damaged
or

defective

parts

THROTTLE
OPENER
CONTROL

SYSTEM

The
function
of
the
throttle

opener
is

to

open
the

throttle
valve
of
carburetor

slightly
in

vehicle
decelera

tion

During
deceleration
manifold
vacuum
rises

and
a

quantity
of
mixture
in
the

enigne
is

not
sufficient
so
that

a
normal
combustion
can
not
continue
and
a

great

amount
of
unburned
HC
is

emitted
The
carburetor

equipped
with
the
throttle

opener
supplies
the

engine

with
an

adequate
charge
of
combustible
mixture
to

keep
proper
combustion

during
deceleration

resulting
in
re

markable
reduction
of

He
emission

The

operation
of
the

throttle

opener
is
as
follows
A

schematic

drawing
of
the

system
is
shown
in

Figure

ET
16

At
the

moment
when
the
manifold

vacuum
increases

as

occurs

upon
deceleration
the

control
valve

opens
to

transfer
the
manifold

vacuum
to

the
servo

diaphragm

chamber
and
the
throttle
valve
of
the
carburetor

opens

slightly
As
the
vehicle

speed
decreases

above
16

km
h

10

MPH
for
manual
transmission

only
the
manifold

vacuum
lowers
to
the

predetermined
value
The
vacuum

control
valve

begins
to
close

gradually
keeping
the

manifold

vacuum
at
the

predetermined
constant
value

As
a

result
both
low
HC
emission
and
normal

engine

brake

during
deceleration
are

obtained

The

altitude
corrector
is

provided
with
a

slight
preload

to

compensate
the

variation
of
the

atmospheric
pressure

Vacuum

control
solenoid

The

purpose
of
this
control
is
to
return
the

speed
of

engine
to
the

prescribed
idling
positively
To
be

accurate
the

control

prevents
the
throttle

opener
from

taking
normal

operation
when
vehicle

speed
is
below

16

km
h

IO
MPH
for
manual
transmission

equipped

model
or
when
transmission
is

placed
in

N
or

P

position
for
automatic
transmission

equipped
model

Current
flows

through
the

solenoid
when
vehicle

speed

falls
below
16
km
h
10

MPH
on

manual
transmission

equipped
model
or
when
the
transmission
is

placed
in

N
or

P

position
on
automatic
transmission

equipped
model

As
this
takes

place
the
needle
valve
is
lifted
off
its
seat

directing
air
from
the
air
chamber
to
the
servo

diaphragm
This
releases
the

operation
of
the
throttle

opener

When

vehicle

speed
goes
over
16
km
h

IO
MPH
or

when
transmission

is

placed
in
a

position
other
than

N

or
P

position
the
solenoid
is

deenergized

allowing
the
throttle

opener
to
take
normal
action

to

reduce
He
emission
to
a
minimum

ET
10

ENGINE

3
Connect
a
3

way
connector
a

manometer
and
a

cock
or
an

equivalent
3

way
change
cock
to
the

end

of
the

vent
line

4

Supply
fresh
air
into
the

vapor
vent
line

through
the

cock
little

by
little

until
the

pressure
becomes
368

mm

Aq
14
5
in

Aq

5
Shut
the
cock

completely
and

leave
it
that

way

6
After
2
5
minutes
measure
the

height
of
the

liquid

in
the
manometer

7
Variation
of

height
should
remain
within
254

mmAq
1
0
in

Aq

8
When
the
filler

cap
does
not
close

completely
the

height
should

drop
to
zero
in
a

short
time

9

If
the

height
does
not

drop
to
zero
in
a

short
time

when
the

filler

cap
is
removed
it
is
the
cause
of
the

stuffy
hose

Note
In

case
the
vent
line
is

stuffy
the

breathing
in

fuel

tank
is
not

thoroughly
made
thus

causing

insufficient

delivery
of
fuel
to

engine
or

vapor

lock

It
must
therefore
be

repaired
or

replaced

3

way

connector

Cock

Air

Manometer
Vapor
liquid

seearator

Flow

guide
valve

E

CQ29

Fig
ET
40

Checking
evaporative
emission
control

system

Checking
flow

guide
valve

I
Disconnect
all
hoses
connected
to
the

flow

guide

valve

2
While
lower

pressure
air
is

pressed
into

the
flow

guide
valve
from
the
ends
of
vent
line
of

fuel
tank
side

the
air
should

go
through
the
valve
and
flow
to

crankcase

side
If
the
air
does
not
flow
the

valve
should

be

replaced
But
when
the
air
is
blown
from

crankcase

side
it
should
never
flow

to
the
other

two
vent
lines

3
While

the
air
is

pressed
into

the
flow

guide
valve
from
the
carburetor
air

cleaner
side

it
flows
to
the

fuel

tank
side
and
or

crankcase
side

4

This
valve

opens
when
the

inner

pressure
is
10

mmHg
0
4
in

Hg
In

case
of

improper

operations
or

breakage
replace
it

From

carburetor

air
cleaner

From
fuel
tank

i

I
I

ti

i

i

1
1

i
To
ran
kcase

E
C030

Fig
ET
41
Flow

guide
valve

Checking
fuel
tank

vaCCUID
relief

valve

operation

Remove
fuel
filler

cap
and
see
if
it
functions

properly

as

follows

Wipe
clean
valve

housing
and
have
it
in

your
mouth

2

Inhale
air
A

slight
resistance

accompanied
by
valve

indicates
that
valve
is
in

good
mechanical
condition
Note

also
that

by
further

inhaling
air
the
resistance
should
be

disappeared
with
valve
clicks

3

If
valve
seems
to
be

clogged
or
if
no
resistance
is
felt

replace
cap
as
an

assembled
unit

T

1i
v

rUr1f
AlI
j

r
I
r
tLMJJl

rr
L

cc

11

J
v

II

4J
L

Valve
I

valve
seat

Spring
Valve

housing

Fig
ET

42
Fuel

filler
cap

ET
24

Air
intake

system
in

trouble

Overheating

Overcooling

Others

NOISY

ENGINE

Car

knocking

Car
knock
when

coasting
ENGINE

Diny
ur

clogged
fuel
strainer

Fuel

pump
will
not
work

properly

Clogged
carburetor

jets

Clogged
air
cleaner

Air

inhaling
from
manifold

gasket
or
carbu

retor

gasket

Insufficient
coolant

Loosened
fan
belt

Worn
or
defective
fan
belt

Defective
thermostat

Defective
water

pump

Clogged
or

leaky
radiator

Defective
radiator
filler

cap

Air

mixing
into

cooling
system

Improper
grade

engine
oil

Incorrect

ignition
timing

Defective
carburetor

lean
mixture

Defective
thermostat

Low

octane
fuel

Improper
tire

pressure

Dragging
brake

Slipping
clutch

Overloading
to

engine

Carbon

knocking

Timing
knocking

Fuel

knocking

Preignition
misusing
of

spark
plug

Incorrect
throttle

opener
adjustment

Trouble
in
PCV
valve

ET
30
Replace

Repair
or

replace

Disassemble
and
clean

Replace
element

Replace
gasket

Replenish

Adjust

Replace

Replace

Replace

Flush

repair
or

replace

Replace

Retighten
each

part
of

cooling
system

Replace
with

proper
grade
oil

Adjust

Overhaul
carburetor

Replace

Replace
with

specified
octane
fuel

Adjust
to

the
specified

pressure

Adjust

Adjust

Use

right

gear
in

driving

Disassemble
cylinder
head
and
remove

carbon

Adjust
ignition
timing

Use

specified
octane
fuel

Use

specified
spark
plug

Adjust
throttle

opener

Replace
PCV
valve

ABNORMAL

COMBUSTION

backfire
afterflfe

run
on
etc

Improper
ignition
timing

Fuel

system
in
trouble

Defective

cylinder
head

etc

EXCESSIVE
OIL

CONSUMPTION

Oil

leakage

Excessive
oil

consumption
ENGINE

Improper
ignition
timing

Improper
heat

range
of

the

spark
plugs

Damaged
carburetor
or
manifold

gasket

backfire
afterflre

Defective
carburetor

jet

Improper
function
of
the
float

Uneven

idling

Improperly
adjusted
valve
clearance

Excess
carbon
in
the
combustion
chamber

Damaged
valve

spring
backfire
afterure

Loose
oil
drain

plug

Loose

or

damaged
oil

pan
gasket

Loose
or

damaged
chain
cover

gasket

Defective
oil
seals
in
front
and

rear
of
the

crankshaft

Loose
or

damaged
locker

cover
gasket

Improper
tightening
of
oil
filter

Loose
or

damaged
oil

pressure
switch

Worn

cylinder
and

piston

Improper
location
of
the

ring
split
or
reo

versed

assembly

ET
32
Adjust
the

ignition
timing

Use

specified
spark
plugs

Replace
them
with
new
ones

Disassemble
the
carburetor
and

check

it

Adjust
the
level
and

check
the
needle

valve

Adjust

Readjust

Remove
the

cylinder
head
and

remove

carbon

Replace
it
with

a
new
one

Tighten
it

Renew
the

gasket
or

tighten
it

Renew
the

gasket
or

tighten
it

Renew
the
oil

seals

Renew
the

gasket
or

tighten
it

Do
not

tighten
excessively

Renew
the

gasket
and

tighten
it
cor

rectly

Retighten
or
renew

the
oil

pressure

switch

Overhaul
the

cylinder
and
renew
the

piston

Reassemble
the

piston
rings
correctly