spark plugs replace DATSUN B110 1973 Service Repair Manual
[x] Cancel search | Manufacturer: DATSUN, Model Year: 1973, Model line: B110, Model: DATSUN B110 1973Pages: 513, PDF Size: 28.74 MB
Page 309 of 513
ENGINE
Checking
cooling
system
hoses
and
connections
Check
cooling
system
hoses
and
fiHings
for
loose
connections
and
deterioration
Retighten
or
replace
as
necessary
Inspection
of
radiator
cap
Apply
reference
pressure
0
9
kg
cm1
13
psi
to
radiator
cap
by
means
of
a
cap
tester
to
see
if
it
is
in
good
condition
Replace
cap
assembly
if
necessary
ET012
Fig
ET
5
Testing
radiator
cap
Cooling
system
pressure
test
With
radiator
cap
removed
apply
reference
pressure
1
6
kg
cm1
23
psi
to
the
cooling
system
bv
means
of
a
tester
to
check
for
leaks
at
the
system
compo
nents
Water
capacity
with
heater
4
9
l
I
Y
US
gal
l
i
Imp
gal
without
heater
4
2
l
I
i
US
gal
i
Imp
gal
Fig
ET
6
Testing
cooling
system
pressure
Checking
vaccum
fittings
hoses
and
connections
Check
vacuum
system
fittings
and
hoses
for
loose
connections
and
deterioration
Retighten
if
necessary
replace
any
deteriorated
parts
Checking
engine
compression
Compression
pressure
test
Note
To
test
cylinder
compression
remove
all
spark
plugs
and
hold
tester
fitting
tightly
in
spark
plug
hole
of
cylinder
The
tester
is
used
to
determine
whether
cylinder
can
hold
compression
or
whether
there
is
excessive
leakage
past
rings
etc
I
Td10
l
y
Fig
ET
7
Testing
compression
pressure
Test
compression
with
engine
warm
all
spark
plugs
removed
and
throttle
and
choke
valve
opened
No
cylinder
compression
should
be
less
than
80
of
highest
cylinder
s
Excessive
variation
between
cyl
inders
accompanied
by
low
speed
missing
of
the
cylinder
usually
indicates
a
valve
not
properly
seating
or
a
broken
piston
ring
Low
pressures
even
though
uniform
may
indicate
worn
rings
This
may
be
accompanied
by
excessive
oil
consumption
Test
conclusion
If
one
or
more
cylinders
read
low
inject
about
one
tablespoon
of
enigne
oil
on
top
of
the
pistons
in
low
ET
4
Page 311 of 513
ENGINE
4
Install
a
timing
light
on
No
cylinder
spark
plug
wire
and
install
a
tachometer
5
Set
idling
speed
to
approximately
800
rpm
6
Check
ignition
timing
if
it
is
50BTDC
Before
Top
of
Dead
Center
by
the
use
of
timing
light
If
necessary
adjust
it
as
follows
Loosen
set
screw
to
such
an
extent
that
distributor
can
be
moved
by
hand
2
Adjust
ignition
timing
to
50BTDC
3
Lock
distributor
set
screw
and
make
sure
that
timing
is
correct
Fig
ET
9
Checking
ignition
timing
Ignition
timing
degree
50
B
T
D
C
Checking
or
replacing
distributor
breaker
point
condenser
and
spark
plugs
Distributor
breaker
point
Check
distributot
breaker
points
for
abnormal
pitting
and
wear
Replace
if
necessary
Make
sure
they
are
in
correct
alignment
for
full
contact
and
that
point
dwell
and
gap
are
correct
Clean
and
apply
distributor
grease
to
earn
and
wick
Note
Do
not
apply
grease
excessively
Distributor
Point
gap
0
45
to
0
55
mm
0
018
to
0
Q22
in
49
to
55
degrees
Dwell
angle
ET004
Fig
ET
10
Checking
distributor
point
gap
Condenser
I
Clean
outlet
of
condenser
lead
wire
and
check
for
loose
set
screw
Retighten
if
necessary
2
Check
condenser
capacity
with
a
capacity
meter
Condenser
insulation
resistance
may
be
also
checked
using
a
tester
by
adjusting
its
range
to
measure
large
resistance
value
When
condenser
is
normal
the
tester
pointer
swings
largely
and
rapidly
and
moves
gradually
back
to
the
infmite
side
When
the
pointet
does
not
stay
still
or
it
points
zero
in
resistance
replacement
is
necessary
Condenser
capacity
0
221LF
Micro
Farad
Condenser
insulation
resistance
5
Mn
Mega
ohms
Spark
plugs
Remove
and
clean
plugs
in
a
sand
blast
cleaner
Inspect
each
spark
plug
Make
sure
that
they
are
of
the
specified
heat
tange
Inspect
insulator
for
cracks
and
chips
Check
both
center
and
ground
electrodes
If
they
are
excessi
ely
worn
replace
with
new
spark
plugs
File
center
electrode
flat
Set
the
gap
to
0
8
to
0
9
rom
0
031
to
0
035
in
using
the
proper
adjusting
tool
Tighten
plugs
to
1
5
to
2
0
kg
m
11
0
to
15
0
ft
lb
torque
ET
6
Page 312 of 513
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
Page 331 of 513
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
Page 334 of 513
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
Page 337 of 513
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
Page 457 of 513
ENGINE
ElECTRICAL
SYSTEM
SPECIFICATIONS
Make
and
type
Primary
voltage
v
Spark
gap
mm
in
Primary
resistance
at
200C
680
F
n
Secondary
resistance
at
200C
680F
Kn
External
resistor
at
200C
680
F
n
Applied
resistor
HANSHIN
HITACHI
H5
15
2
C6R
601
12
12
more
than
7
more
than
7
0
28
0
28
1
17
to
I
43
l
l
7
to
I
43
11
2
to
16
8
11
2
to
16
8
l
3tol7
l
3tol7
RC
15
5560R
151O
SPARK
PLUG
CONTENTS
DESCRIPTION
INSPECTION
CLEANING
AND
REGAP
EE
37
EE
37
EE
38
DESCRIPTION
The
spark
plugs
are
of
the
resister
type
having
14
mm
0
551
in
threads
and
0
8
to
0
9
mm
0
031
to
0
Q35
in
gap
Note
All
spark
plugs
installed
on
an
engine
must
be
of
the
same
brand
and
number
of
heat
range
INSPECTION
1
Remove
spark
plug
wire
by
pulling
on
boot
not
on
wire
itself
2
Remove
spark
plugs
3
Check
electrodes
and
inner
and
outer
porcelains
of
plugs
noting
the
type
of
deposits
and
the
degree
of
electrode
erosion
Refer
to
Figure
EE
74
Normal
Brown
to
grayish
tan
deposits
and
slight
elec
trode
wear
indicate
correct
spark
plug
heat
range
SPECIFICATIONS
AND
SERVICE
DATA
TROUBLE
DIAGNOSES
AND
CORRECTIONS
EE
38
EE
39
Carbon
fouled
Dry
fluffy
carbon
deposits
on
the
insula
tor
and
electrode
were
mostly
caused
by
slow
speed
driving
in
city
weak
ignition
too
rich
fuel
mixture
dirty
air
cleaner
etc
H
is
advisable
to
replace
with
plugs
having
hotter
heat
range
Oil
fouled
Wet
black
deposits
show
excessive
oil
en
trance
into
combustion
chamber
through
worn
rings
and
pistons
or
excessive
clearance
between
valve
guides
and
stems
If
the
same
condition
remains
after
repair
use
a
hotter
plug
Overheating
White
or
light
gray
insulator
with
black
or
gray
brown
spots
and
bluish
burnt
electrodes
indicate
engine
overheating
Moreover
the
appearance
results
from
incorrect
ignition
timing
loose
spark
plugs
low
fuel
pump
pressure
wrong
selection
of
fuel
a
hotter
plug
etc
H
is
advisable
to
replace
with
plugs
having
colder
heat
range
EE
37
Page 459 of 513
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
Page 460 of 513
Troubles
Engine
misses
Engine
causes
knocking
very
often
Engine
does
not
give
enough
power
Trouble
location
Distributor
Ignition
coil
High
tension
code
Spark
plugs
Distributor
Spark
plugs
Distributor
Spark
plugs
ENGINE
Causes
Dirty
point
Improper
point
gap
Leak
of
electricity
of
cap
and
rotor
head
Defective
insulation
of
condenser
Defective
arm
Defective
spring
of
arm
Breakage
oflead
wire
Worn
out
or
shaky
breaker
plate
Worn
out
or
shaky
distributor
shaft
Layer
short
circuit
or
use
of
inferior
quality
Deterioration
of
insulation
and
leak
of
electricity
Dirty
Leak
of
electricity
at
upper
porcelain
insu
lator
Improper
and
advance
timing
Coming
off
or
breakage
of
governor
spring
A
pin
or
a
hole
of
governor
portion
worn
out
Burnt
too
much
Improper
and
retarded
timing
Defedive
function
of
governor
Dirty
point
Point
gap
too
narrow
Dirty
EE
40
Remedies
Clean
Correct
Repair
or
replace
Replace
Oil
shaft
Replace
assembly
Replace
Replace
assembly
Replace
assembly
Replace
with
good
one
Replace
Clean
Repair
or
replace
Correct
the
fitting
Correct
or
replace
Replace
Replace
Correct
the
fitting
Replace
assembly
Clean
Correct
Clean