1973 DATSUN B110 checking oil

EMISSION
CONTROL
AND

TUNE
UP

Fig
ET
11

Checking
spark
plug
gap

Checking
distributor

ignition
wiring

and

ignition
coil

Distributor

Check

centrifugal
advance
unit
for
loose
connection

or

improper
operation

If
it
is
not

operating

properly
the
trouble

may
be
due

to
a

sticky
spring
or

excessively
worn

parts

This

operation
needs
a
distributor
tester
As
to

inspection
procedure
and
reference
data
refer

to

relative

topic
under
Distributor
in
Section
EE

Page

EE
32

If
vacuum
advance
mechanism
fails
to

operate

proJr

erly
check
for
the

following
items
and
correct
the

trouble
as

required

1

Check
vacuum
inlet
for

signs
of

leakage
at
its

connection
If

necessary
retighten
or

replace
with
a

new
one

2

Check
vacuum

diaphragm
for
air
leak

If
leak
is

found
replace

diaphragm
with
a

new
one

3

Inspect
breaker

plate
for
smooth

moving

If

plate
does
not
move
smoothly
this
condition
could

be
due
to

sticky
steel
balls
or

pivot

Apply
grease
to
steel
balls
or

if

necessary
replace

breaker

plate
as
an

assembly

For
vacuum
advance
characteristics
refer
to
Distribu

tor
in

Section
EE

Page
EE
32

Ignition
wiring

Use
an
ohmmeter
to
check
resistance
of
secondary

cables
Disconnect
cables
from

spark
plugs
and
install

the

proper
adapter
between
cable
and

spark
plug
Remove

distributor
cap
from
the
distributor

with

secondary
cables
attached
Do
not
remove
the
cables

from
the

cap

Check
the
resistance
of
one

cable
at
a
time

Connect
the
ohmmeter
between

the

spark
plug
adapter

and

the

corresponding
electrode

inside
the

cap
If

resistance
is

more
than
30

000
ohms
remove
the
cable

from
the

cap
and
check
cable
resistance

only
If
the

resistance
is
still

more
than
30
000
ohms
replace
cable

assembly

T

I

II

Fig
ET
12

Checking
high
tension
cables

Ignition
coil

Check

ignition
coil

for

appearance
oil

leakage
or

performance
For
details
refer
to
Section
EE

Page

EE36

Checking
distributor

cap
and
rotor

Note
This

operation
is
to
be

performed
while

chekcing

distribuotr

points
Inspect
distributor

cap
for

cracks
and
flash
over

External
surfaces
of
all

parts
of

secondary
system
must

be
cleaned
to
reduce

possibility
of

voltage
loss
All
wires

should
be
removed
from
distributor
cap
and
coil

so
that

terminals
can
be

inspected
and
cleaned
Burned
or

corroded
terminals
indicate
that
wires
were
not

fully

seated
which

causes
arcing
between
end
of
wire

and

terminal
When

replacing
wires
in

terminal
be
sure

they

are

fully
seated
before

pushing
rubber

nipple
down
over

tower

Check
distributor
rotor
for

damage
and
distributor

cap
for
cracks

ET
7

EMISSION
CONTROL
AND

TUNE
UP

CD

@

Fresh
air

Blow

by

gas

Air
used
in

filtering
oil
1
PCV
valve

2
Flame
arrester

3
Oil
filler

cap

4

Baffle

plate
and

steel
net

E
C002

Fig
ET
J8
Crankcase
emission
control

system
at

full
throttle

open

Checking
and

replacing
PCV
valve

Test
PCV

valve
in
accordance
with
the

following

me
thod

With

engine
running
at
idle
remove
the
ventilator
hose

from
PCV

valve
If
the
valve
is

working
a

hissing
noise

will
be

heard
as
air

passes
through
the
valve
and

a

strong

vacuum
should
be
felt

immediately
when

a

finger
is

placed

over
the
valve
inlet
If
the
valve
is

plugged
replace
with

a

new
one
Check
for

deposit
plugging
in
the
hose
Clean
if

necessary

Intake
manifold

l

illlr
nnnl

UUUU
l
I

G

EC014

FigET
39
Cross
sectional
view

of
PCV
valve
Checking
ventilation
hoses

I
Check
hoses

and
hose
connections
for
leaks

2
Disconnect

all
hoses
and
blow
them

out
with

compressed
air

If

any
hose
can
not
be
free
of

obstructions

replace

with
a

new
one

Insure

that
the
flame
arrester
is

surely
inserted
in

the

hose

between
the
air
cleaner
and
rocker

cover

EVAPORATIVE
EMISSION

CONTROL
SYSTEM

Checking
engine
compartment
hose

connections
and
fuel

vapor
control

valves

Checking
fuel
tank

vapor
liquid
separator
and

vapor

vent
line

I

Check
all
hoses
and
fuel
tank

ftIler

cap

2

Disconnect
the

vapor
vent
line

connecting
flow

guide
valve
to

vapor
liquid

separator

ET
23

ENGINE

J

I
r
I

I
J

fj

7
L

j
8

if

d1
I

ilfi
3

c

7

I
t

j

v

1

Ji

Fig
EM
27

Valve
mo
1

2
Be
careful
not
to
lose
valve

spring
seat
oil
seal
valve
collet
and
valve
rocker

spring

O

tj
AAAftIl

C

e
WWII

o

glAWle

Fig
EM
28

Valve

components

INSPECTION
AND
REPAIR

CONTENTS

PREPARATION
FOR
INSPECTION
EM
8

How
to
measure
cylinder
bore

EM
16

CYLlNOER
HEAD
AND

80ring
cylinder
EM
16

VALVES

EM
9

PISTON
PISTON
PIN
AND

Checking
cylinder
head

mating
face
EM
9

PISTON
RING

EM
18

Valve

assembly
EM
9

CONNECTING
ROD

EM
19

Valve

spring
EM
10
CRANKSHAFT
EM

20

Valve
rocker
shaft
and
rockei
arms

EM
lO
BUSHINGS
AND
BEARINGS

EM

21

Valve
lifter

and

push
rud

EM
11

Measuring
main

bearing
clearance

EM
21

Valve

guide
EM
11

Measuring
connecting
rod

bearing
clearance

EM
22

Valve
seat
inserts

EM
12

Fitting
crankshaft
bearings
EM
22

CAMSHAFT
AND

CAMSHAFT
BEARINGS
EM
14

Fitting
camshaft

bushings
EM
23

Measuring
camshaft

bearing
clearance

EM
14

MISCELLANEOUS
COMPONENTS
EM

24

Valve

timing
EM
14
Crankshaft

sprocket
and
camshaft

Checking
camshaft
for

bending
EM
14

sprocket
EM

24

CYLlNOER
BLOCK
EM
15

Flywheel
EM

25

PREPARATION
FOR
INSPECTION

L

Check
the

cylinder
head
and

cylinder
block
for

traces

of
water
leaks
before

cleaning

2

Clean
all

parts
to
remove
oil
stains
carbon

deposits
fur
and
other

foreign
matters

completely

3
Make

sure
that
all
oil
holes
are
clear
Blow
air
into

them
if

required

4

Secure

proper
assembly
carefully

EM
8

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
MECHANICAL

o

Match
mark

Key
groove

Fig
EM
78
1

Setting
chain

12

Install
the
timing
chain
and

camshaft

sprocket

Camshaft

sprocket

tightening
torque

4

0
to
4
8

kg
m
29

to
35
ft
lb

Fig
EM

78
2
Chain
tensioner
installation

Fig
EM
7B
Cam

sprocket
gear
installation

Notes
a
Make

sure
that
the

camshaft

sprocket
dowel

hole
and
crankshaft

sprocket
key
are
in
line
and

both
the
dowel
hole
and

key
are
located
down

ward
b
Set
the

timing
chain

making
its

mating
marks

meet
with
those
of
crankshaft
sprocket
and

camshaft

sprocket
at
the

right
hand
side

13
Install
the

timing
chain
tensioner
and

tighten
the

tensioner
bolts
to
a

torque
of
0
6
to
0
8

kg
m
4
3

to
5

8

ft
lb

Check
the
tensioner

spindle
projection

Wear
limit

Spindle
projection

mm
in
15
0

591

Fig
EM
79

Checking
the
tension

spindle
projection

14
Install
the
crankshaft
oil

thrower

15

Install
the

new
oil
seal
to
the
front
cover
The

front
cover
oil
seal
should
be

replaced
when
the
front

cover
is

disassembled

16

Install
the

front
cover

applying
the

sealing
agent
to

both
surfaces
of
the

gasket

Tightening
torque

0
5
to
0
7

kg
m
3
6
to
5
1

ft
lb

EM
29

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
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