1973 DATSUN B110 oil level

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

Spark
plugs

Cap
mm
in
0
8
to
0
9
0
03110
0
035

Idle
CO
ldie

speed

Manual
transmission

rpm

rpm
1
5

to
5
800

1
5
to
5

650
in
D

position
Automatic
transmission

Dash

pot

Setting

engine
speed

rpm
1
900

to
2
000

Throttle

opener
at
sea
level

Setting
vacuwn

pressure

Manual
transmission

Automatic
transmission

Setting

engine
speed
no
load

Servo

diaphragm
full
stroke
rpm

mm
in
500
to
540
19
7

to
21
3

480
to
520

18
9
to
20
5

1
650
to
1
850

5
0
1969
mmHg
in
Hg

mmHg
in
Hg

Theono
switch
Temperature
rises

from
low
to

high
oC
0

F
above
5

41

Flow

guide
valve

Opera
ting

pressure
mmHg
in

Hg
10
0
4

TROUBLE
DIAGNOSES
AND
CORRECTIONS

Troubles
Possible
causes
Remedies

CANNOT
CRANK

ENGINE
OR
SLOW

CRANKING
Improper
grade
oiL
Replace
with

proper
grade
oiL

Discharged
battery
Charge
battery

Defective

battery
Replace

Loosen
fan
belt
Adjust

Trouble
in

charge
system
Inspect
charge
system

Wiring
connection
trouble
in

starting
circuit
Correct

Defective
starter
switch
Repair
or

replace

Defective
starter
motor
Repair
or

replace

ET
26

I

ENGINE

Defective

spark
plug

Improper
ignition
timing

Defective

ignition
coil

Disconnection
of

high
tension

cable

Loose
connection
or
disconnection
in

prima

ry
circuit

Lack
of
fuel

Dirty
fuel
strainer

Dirty
or

clogged
fuel

pipe

Fuel

pump
will
not
work

properly

Carburetor

auto
choke
will
not
work

prop

erly

Improper
float
level

adjustment

Improper
idling

Dirty
or

clogged
carburetor

Damaged
anti
dieseling
solenoid

Clogged
breather

pipe

Incorrect

spark
plug
tightening
or
defective

gasket

Improper
grade
engine
oil

or

viscosity
drop

ping

Incorrect
valve
clearance

Compression
leak
from
valve
seat

Sticky
valve
stem

Weak
or

defective
valve

springs

Compression
leak
at

cylinder
head

gasket

Sticked
or
defective

piston
ring

Worn

piston
ring
or

cylinder

Troubleshooting
procedure

Pour

engine
oil
from

plug
hole
and

then
measure
cylinder
compression
Clean

adjust
plug
gap
or

replace

Adjust

Replace

Replace

Repair
or

replace

Supply

Replace

Clean

Repair
or

replace

Check
and

adjust

Correct

Adjust

Disassemble
and

clean

Replace

Clean

Tighten
to
normal

torque
or
replace

spark
plug
assembly

Replace
with

proper
grade
oil

Adjust

Remove

cylinder
head
and

lap
valves

Correct
or

replace
valve

Replace
valve

springs

Replace
gasket

Replace

piston
ring

Overhaul

engine

Compression
increases
Trouble
in

cylinder
or

piston
ring

Compression
unchanged
Compression
leak
from
valve
cylinder

head
or
head

gasket

ET

28

IMPROPER
ENGINE

IDLING

Fuel

system
in

trouble

Low

compression

Others

Ignition
system
in
trouble

Engine
idle
too
fa
t

ENGINE
POWER
NOT

UP
TO
NORMAL

4
w

compression

Ignition

system
in

trouble

Fuel

system
in
trouble
EMISSION
CONTROL
AND
TUNE
UP

Clogged
or

damaged
carburetor

jets

Incorrect

carburetor

adjustment
idle

speed

idle
mixture

Clogged
air

cleaner

Defective

gaskets
of
manifolds
or

carburetor

insulator

Improper
float
level

adjustment

Incorrect
valve
clearance

Extremely
low
revolution

Incorrect
basic

ignition
timing

Incorrect
automatic

teinperature
control
air

cleaner

Defect
or
malfunction
of

ignition
system

spark
plug
high
tension
cable
breaker

point
ignition
coil
etc

Trouble
in
throttle
link
and
cable

Incorrect
throttle

opener

adjustment

Trouble
in

PCV
valve

Trouble
in
automatic

choke

Defect

or
malfunction
of

ignition
system

spark
plug
high
tension
cable

breaker

point
ignition
coil
etc

Incorrect

ignition
timing

Defective

spark
plugs

Defective
distributor

points

Malfunction
of
choke

system

Clogged
fuel

pipe

ET
29
Clean
or

replace

Adjust
idle

speed
mixture

Replace
element

Replace

gasket

Adjust

Previously
mentioned

Adjust

Adjust
idie

rpm

Adjust
ignition
timing

Adjust
automatic

temperature
control

air
cleaner

Adjust
or

replace
ignition
system

Check
throttle
link
and
cable

Adjust
throttle

opener

Replace
PCV
valve

Adjust
automatic
choke

Adjust
or

replace

ignition
system

Previously
mentioned

Adjust

Clean

adjust
or

replace
plugs

Dress
or

replace
points
Check
con

denser

Adjust

Clean

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

Water

pump

knocking

II
Other
mechanical

trouble

Sticked

valve

Seized

valve

seat

Excessively
worn

cylinder
and

piston
ENGINE

MECHANICAL

Improper
shaft
end

play

Broken

impeller

Improper
valve
clearance

Insufficient
clearance
between

valve
stem

and

guide

Weakened
or
broken
valve

spring

Biting
or

damage
ofvalve

stem

Poor
fuel

quality

Improper
valve

clearance

Weakened
valve

spring

Thin

valve
head

edge

Narrow
valve
seat

Overheat

Over

speeding

Sticked

valve

guide

Shortage
of

engine
oil

Dirty

engine
oil

Poor

oil

quality

Overheat

Wrong
assembly
of

piston
with

connecting
rod

Improper
piston
ring
clearance

Dirty
air

cleaner

Too

rich
mixture

Engine
over
run

Slicked
cho
e
valve

Over

choking

EM
39
Replace

Replace

Adjust

Clean
stem
or

ream
the

guide

Replace

Replace
or
clean

Use

good
fuel

Adjust

Replace

Replace
valve

Reface

Repair
or

replace

Drive
under

proper
speed

Repair

Add
or

replace
oil

Check
oil
level

on

daily
basis

Clean
crankcase

replace
oil

and

re

place
oil
fIlter
element

use

right
oil

Repair
or

replace

Repair
or

replace

Adjust

Clean

periodically

Adjust

Drive

correctly

Clean
and

adjust

Start
in

correct

way

r

Defective

connecting

rod

Defective
crankshaft

bearing
ENGINE

Shortage
of

engine
oil

Low
oil

pressure

Poor

engine
oil

quslity

Rough
surface
of
crankshaft

Clogged
oil

passage

Wear
or

eccentricity
of

bearing

Wrong
assembly
of

bearing

Loose

bearing

Incorrect

connecting
rod

alignment

Shortage
of

engine
oil

Low
oil

pressure

Poor

engine
oil

quality

Wear

or
out
of

round
of
crankshaft

journal

Clogged
oil

passage
in
crankshaft

Wear
or

eccentricity
of

bearing

Wrong
assembly
of

bearing

Not
concentric

crankshaft
or

bearing

EM
40
Add
or

replace
oil

Check
oil
level
on

daily
basis

Correct

Use

right
oil

Grind
and

replace
bearing

Clean

Replace

Repair

Replace

Repair
or

replace

Add
or

replace

Check
oil
level
on

daily
basis

Adjust

Use

right
oil

Repair

Clean

Replace

Repair

Replace

ENGINE

INSPECTION

Check

the

upper
and
lower
bodies
for
cracks

2

Check
the
valve

assembly
for

wear
of
the
valve
and

valve

spring
Blow
the
valve

assembly
by
breath
to

examine
its

function

3

Check
the

diaphragm
for
small
holes
cracks

and

wear

4

Check
the
rocker

arm
for
wear
at
the

portion
in

contact
with

the
camshaft

5

Check
the
rocker
arm

pin
for
wear
since
a
worn

pin

may
cause
oil

leakage

6

Check
all
other

components
for

any
abnormalities

and

replace
with
new

parts
as

required
ASSEMBLY

Assembly
is
done
in
reverse
order
of

disassembly
For

reassembly
and

reinstallation
the

following
matters

should
be
noted

Use
new

gasket

2
Lubricate
the
rocker
arm

link
rocker
arm

pin
and

lever

pin
before
installation

3
To

test
the
function

position
the

fuel

pump
assem

bly
about
I

meter
3
3
ft
above
fuel
level
with
a

pipe

connecting
the
fuel

pump
and
the
fuel

strainer
and

operate
the
rocker

afm

by
hand
If
fuel
is
drawn

up
soon

after
the
rocker
arm
is
released

the
function
of
the

pump

is

satisfactory

CARBURETOR

CONTENTS

DESCRIPTION

STRUCTURE
AND
OPERATION
EF

8

EF

9

EF
10

EF
11

EF
12

EF
12

EF
12

EF
14

EF
14

EF
15

EF
15

EF
16

EF

16
Primary
system

Secondary
system

Anti

dieseling
solenoid
valve

Float

system

Electric
automatic
choke

ADJUSTMENT

Idling
adjustment

Fuel
level

adjustment

Fast
idle

adjustment

Vacuum
break

adjustment

Choke
un
loader

adjustment

DESCRIPTION

The
carburetors
are

of
a

downdraft

type
which
is

designed
and
built

to
increase

power
and

fuel

economy
as
Bi
metal

setting

Adjustment
of

interlock

opening
of

primary
and

secondary
throttle
valves

Dash

pot
adjustment

MAJOR
SERVICE
OPERATIONS

Removal

Disassembly

Cleaning
and

inspection

Assembly
and
installation

JETS

SERVICE
DATA
AND
SPECIFICATIONS

TROUBLE
DIAGNOSES
AND

CORRECTIONS
EF
17

EF
18

EF
18

EF
19

EF
19

EF
19

EF
21

EF
22

EF
22

EF
22

EF
22

well
as
to
reduce
the

emission
of
exhaust

gases

These
carburetors

present
several
distinct
features
of

importance
to
the

car
owners

A

summary
of
features
is
as
follows

EF
8