DATSUN 510 1968 Service User Guide
Manufacturer: DATSUN, Model Year: 1968, Model line: 510, Model: DATSUN 510 1968Pages: 252, PDF Size: 12.2 MB
Page 11 of 252
CHAPTER
TWO
PERIODIC
MAINTENANCE
To
ensure
good
performance
dependability
and
safety
regular
penodlc
maintenance
is
necessary
TIns
chapter
outlInes
routine
and
penodlc
mamtenance
for
the
average
dnver
Under
heavy
usage
semcmg
mtervals
will
be
shortened
Regular
routme
mamtenance
will
help
aVOId
expensive
repaIrs
ROUTINE
CHECKS
The
followlDg
checks
should
be
performed
at
each
fuel
stop
1
Check
engme
oil
level
Top
up
as
requrred
2
Check
radiator
coolant
level
Top
up
as
re
qwred
3
Check
battery
electrolyte
The
battery
case
IS
marked
With
upper
hrmt
and
lower
lnmt
lInes
Level
should
be
maID
tamed
between
the
IIDes
4
Check
that
the
master
cylInder
brake
flwd
reservOir
level
IS
between
the
max
and
mm
lInes
marked
on
the
plastic
case
S
Check
the
plastic
clutch
cyhnder
reservoir
level
Level
should
be
between
the
max
and
mm
lInes
6
Check
the
windsh1eld
washer
flwd
reservoir
Top
up
as
required
7
Check
tire
pressures
when
the
tIres
are
cold
Front
and
rear
tire
pressures
should
be
24
pounds
under
normal
dnving
conditions
TIre
pressure
should
be
28
pounds
for
h1gh
speed
dnvmg
conditions
8
Check
the
engIne
for
general
conditIon
Check
for
leaky
or
cracked
hoses
and
loose
wmng
9
Check
condition
of
wmdshleld
wiper
blades
PERIODIC
CHECKS
Table
1
prOVIdes
penodIc
checks
and
main
tenance
that
should
be
performed
on
a
set
schedule
Table
2
gIves
recommended
lubncants
and
Table
3
specIfies
the
grades
of
oil
that
should
be
used
Procedures
for
performmg
the
semces
are
presented
ID
vanous
chapters
of
tlus
manual
Table
3
RECOMMENDED
GRADES
OF
OIL
Temperature
Engine
on
MS
Above
32
C
90
F
average
SAE
30
IOW
30
32
to
0
C
90
to
32
F
mlmmum
SAE
20
20W
IOW
30
O
to
12
C
32
tolO
F
mlRlmum
SAE
IOW
IOW
30
Below
12
C
10
F
mlmmum
SAE
lOW
IOW
30
Page 12 of 252
PERIODIC
MAINTENANCE
7
Table
1
ENGINE
LUBRICATION
AND
MAINTENANCE
FREQUENCY
EVERY
E
E
E
E
E
E
E
Eo
00
00
00
00
00
00
00
gq
00
00
00
NO
t
r61li
0
CD
Check
engine
011
level
top
up
If
required
X
Change
engine
011
X
Lubricate
carburetor
hnkage
X
Lubricate
distributor
rotor
shaft
and
ann
shaft
X
Apply
grease
to
distributor
cam
heel
X
Check
radiator
coolant
level
X
Change
radIator
coolant
X
Change
radiator
coolant
additive
X
Check
battery
electrolyte
level
X
Check
specific
gravity
of
battery
X
Check
engine
starting
exhaust
color
X
Tighten
cyhnder
head
manifolds
and
pipe
flanges
X
Adjust
valve
clearance
X
Check
Ignition
timing
X
Tighten
carburetor
fittings
X
Check
fan
belt
tension
X
Check
for
011
pan
leakage
X
Tighten
engine
mounts
X
Check
fuel
strainer
X
Replace
fuel
strainer
X
Check
for
fuel
leaks
X
Replace
011
filter
X
Check
spark
plugs
X
Replace
spark
plugs
X
Check
dlstnbutor
cap
rotor
and
POints
X
Adjust
engine
Idle
speed
X
Check
air
cleaner
fittings
X
Clean
011
filler
cap
X
Clean
battery
cables
and
terminals
X
Check
alternator
and
voltage
regulator
function
X
Check
starter
motor
function
X
Replace
aIr
cleaner
element
X
Check
fuel
pump
function
X
Check
cyhnder
compressIon
X
Clean
carburetor
Jets
and
float
chamber
X
Check
dlstnbutor
condenser
X
Check
crankcase
ventilation
control
valve
X
Page 13 of 252
8
CHAPTER
TWO
Table
2
RECOMMENDED
LUBRICANTS
Manufacturer
Shell
Mobil
Caltex
Esso
BP
Castro
Lubncatlng
pomts
BP
ngme
Single
Shell
Super
Moblloll
Havahne
Esso
Extra
ViscostatlC
Carburetor
grade
Motor
011
SpeCial
Custom
Motor
011
longUe
Castrollte
linkage
ngme
011
Shell
x
100
HD
made
IOW
30
Motor
011
or
IOW
30
Dlstnbutor
lOW
3D
IOW
30
lOW
3D
20W
40
ViscostatlC
shaft
Motor
011
Shell
Moblloll
Havallne
Castrol
Engine
Mulb
grade
x
100
Arcbc
or
RPM
Esso
Motor
BP
HD
20HD
Carburetor
ngme
011
30
20
or
Moblloll
Motor
011
30
Motor
011
30HD
hnkage
20W
lOW
A
or
AF
011
HD
lOW
20W
DIStributor
shaft
Mulb
Esso
Multl
BP
Castro
Shell
Mobil
purpose
nergrease
lease
DIstnbutor
purpose
Rellnax
A
Grease
Marfak
Grease
or
LM
eam
heel
Grease
Beacon
t
r
Page 14 of 252
CHAPTER
THREE
TROUBLESHOOTING
TroubleshootIng
the
Datsun
can
be
relatlvely
simple
1f
done
lOgically
The
first
step
must
always
be
to
define
symptoms
as
closely
as
pos
Sible
Subsequent
steps
mvolve
testIng
and
an
alyzmg
areas
which
could
cause
the
symptoms
Procedures
m
thiS
chapter
analyze
typical
symp
toms
and
give
lOgical
methods
of
isolation
These
are
not
the
only
methods
There
may
be
several
approaches
to
solvmg
a
problem
but
all
must
have
one
thmg
m
common
a
lOgical
systematic
approach
TROUBLESHOOTING
EQUIPMENT
The
followmg
eqUipment
is
necessary
to
prop
erly
troubleshoot
an
engme
1
Voltmeter
Ammeter
and
Ohmmeter
2
Hydrometer
3
Compression
Tester
4
Vacuum
Gauge
5
Fuel
Pressure
Gauge
6
Dwell
Meter
7
Tachometer
8
StroboscopiC
Trming
Light
9
Exhaust
Gas
Analyzer
Items
1
through
8
are
essentlal
Item
9
is
necessary
for
exhaust
elDlSSion
control
comph
ance
The
followmg
is
a
bnef
description
of
the
functlon
of
each
mstrument
Voltmeter
Ammeter
and
Ohmmeter
For
testIng
the
ignitlon
and
electncal
systems
a
good
voltmeter
is
reqUIred
For
automotIve
use
an
mstrument
covenng
0
20
volts
is
salls
factory
It
should
have
an
accuracy
of
about
Ih
volt
which
excludes
the
common
auto
moUve
type
found
in
instrument
panels
An
ohmmeter
measures
electncal
reSiStance
and
is
reqUired
to
check
electncal
contInUity
open
and
short
circwts
and
for
testing
fuses
and
hghts
The
ammeter
measures
electncal
current
One
for
automotIve
use
should
cover
0
10
and
0
100
amperes
An
ammeter
is
useful
for
checkmg
bat
tery
chargmg
and
startIng
current
The
starter
and
generator
procedures
m
tlus
manual
use
an
ammeter
to
check
for
shorted
wmdmgs
Several
inexpensive
VOM
s
volt
ohmmeters
combme
all
mstruments
and
fit
easily
mto
any
tool
box
The
ammeter
ranges
are
often
too
small
for
auto
motIve
work
thougll
Hydrometer
A
hydrometer
is
necessary
to
check
battery
condition
and
charge
It
measures
specific
grav
ity
of
the
electrolyte
in
each
cell
Compression
Tester
The
compressiOn
tester
measures
compression
Page 15 of 252
10
CHAPTER
THREE
pressure
bUllt
up
In
each
cylInder
The
readIngs
when
properly
Interpreted
IndIcate
general
cyl
Inder
and
valve
condltlOn
Vacuum
Gauge
The
vacuum
gauge
IS
easy
to
use
but
dIfficult
for
an
Inexpenenced
mechanIC
to
Interpret
The
results
when
conSIdered
WIth
other
findIngs
can
prOVIde
valuable
clues
to
pOSSIble
trouble
Connect
the
vacuum
gauge
WIth
a
T
connec
tIon
In
the
hose
from
the
carburetor
to
the
vacuum
advance
on
the
dIstnbutor
Start
the
engme
and
let
It
warm
up
thoroughly
Vacuum
readIng
should
be
steady
at
18
22
Inches
NOTE
Subtract
1
Inch
from
reading
for
every
1000
feet
of
altitude
Figure
1
shows
numerous
tYPical
readIngs
WIth
InterpretatIons
Results
are
not
conclusive
WIthout
companng
to
other
tests
such
as
com
preSSIOn
readIngs
Fuel
Pressure
Gauge
ThIS
Instrument
IS
VItal
for
evaluatIng
fuel
pump
performance
Often
a
vacuum
gauge
and
fuel
pressure
gauge
are
combIned
Dwell
Meter
A
dwell
meter
measures
the
dIstance
In
de
grees
of
cam
rotatIon
that
the
breaker
pOInts
remaIn
closed
while
the
engme
IS
runnIng
SInce
thIS
angle
IS
determmed
by
breaker
pOInt
gap
the
dwell
angle
IS
an
accurate
IndIcatIon
of
pOInt
gap
Many
tachometers
Intended
for
tunIng
and
testIng
Incorporate
a
dwell
meter
as
well
Follow
the
manufacturer
s
InstructIon
to
measure
dwell
on
the
Datsun
Tachometer
A
tachometer
IS
essential
for
tunIng
Datsuns
WIth
exhaust
emission
control
deVices
IgmtIOn
turung
and
carburetor
adjustments
must
be
per
formed
at
the
specified
Idle
speed
The
best
In
strument
for
thIS
purpose
IS
one
WIth
a
range
of
0
1
000
or
0
2
000
rpm
Extended
range
0
6
000
or
8
000
Instruments
lack
accuracy
at
lower
speeds
The
InStrument
should
be
capable
of
detecting
changes
of
25
rpm
Stroboscopic
Timing
Light
ThIS
Instrument
pernuts
accurate
IgnitIon
tImIng
By
f1ashmg
a
bght
at
the
preCISe
Instant
cylInder
No
1
fires
the
posItIon
of
the
crank
shaft
pulley
at
that
Instant
can
be
seen
Marks
on
the
pulley
bne
up
With
a
reference
pOInter
on
the
block
dunng
the
tIming
procedure
SUltable
bghts
are
neon
bulb
types
and
xenon
strobe
hghts
Neon
tunmg
bghts
are
ddticult
to
see
and
must
be
used
in
dImly
bt
areas
Xenon
strobe
bghts
can
be
used
In
bnght
sunbght
Use
the
bght
accordIng
to
the
manufacturer
s
InStruC
tIons
Exhaust
Analyzer
Of
all
Instruments
descnbed
here
this
IS
the
least
bkely
to
be
owned
by
a
home
mechanic
One
Instrument
samples
the
exhaust
gases
from
the
taIlpIpe
and
measures
the
thermal
conduc
tIVIty
of
the
exhaust
gas
SInce
different
gases
conduct
heat
at
varYIng
rates
thermal
conduc
tIVIty
of
the
exhaust
IS
a
good
IndIcatIon
of
gases
present
This
Instrument
IS
VItal
for
accurately
checkIng
the
effectIveness
of
exhaust
emIssion
control
adjustments
but
IS
too
expenSIve
for
an
amateur
mechanIC
to
conSIder
buying
STARTER
Starter
system
troubles
are
relatIvely
easy
to
ISolate
The
followmg
are
common
symptoms
and
cures
1
Engme
cranks
very
slowly
or
not
at
all
Turn
on
the
headhghts
If
the
bghts
are
very
dun
most
likely
the
battery
or
the
connecting
WireS
are
at
fault
Check
the
battery
using
the
pro
cedures
descnbed
in
the
Tune
up
chapter
Check
wmmgfur
e
s
wom
andd
connectIom
H
the
battery
and
connectIng
WIres
check
good
turn
the
headlIghts
on
and
try
to
crank
the
engIne
H
the
lIghts
dIDl
drastIcally
the
starter
is
probably
shorted
to
ground
Remove
the
starter
and
test
it
usmg
the
procedures
gIven
in
Chapter
NIne
If
the
lights
remain
bnght
or
dun
slIghtly
when
crankIng
the
engme
the
trouble
may
be
in
the
starter
solenOId
or
wmng
To
ISolate
the
trouble
short
the
two
large
solenoid
ternunals
together
not
to
ground
if
the
starter
cranks
normally
check
the
solenoid
and
wmng
up
to
the
Page 16 of 252
TROUBLESHOOTING
11
CD
1
NORMAL
READING
18
22
at
Idle
4
LATE
VALVE
TIMING
8
15
at
Idle
7
WORN
RINGS
DILUTED
OIL
Drops
to
0
then
rises
to
22
when
accelerator
IS
rapidly
de
pressed
and
released
10
BURNm
OR
WARPED
VALVE
Regular
evenly
spaced
down
scale
flick
about
4
2
NORMAL
READING
High
11ft
cam
With
large
over
lap
5
INTAKE
LEAK
Low
steady
reading
8
STICKING
VALVE
S
Normally
steady
IntermIttent
1y
flicks
downward
about
4
11
WORN
VALVE
GUIDES
OsCillates
about
4
3
LATE
IGNITION
TIMINe
14
17
at
Idle
Normal
cam
6
NORMAL
READING
Drops
to
2
then
nses
to
25
when
accelerator
IS
raptdly
de
pressed
and
released
9
LEAKY
VALVE
Regular
drop
about
2
12
WEAK
VALVE
SPRINGS
Violent
OSCillations
about
1O
as
rpm
Increases
Often
steady
at
Idle
Page 17 of 252
12
CHAPTER
THREE
13
IMPROPER
IDLE
MIXTURE
Roats
slowly
between
13
17
14
SMALl
SPARK
GAP
or
DEFECTIVE
POINTS
Slight
float
between
14
16
ignItIOn
switch
If
the
starter
still
fails
to
crank
properly
remove
the
starter
and
test
it
2
Starter
turns
but
does
not
engage
with
engine
This
trouble
is
usually
a
defective
pInion
or
sole
noid
shlfting
fork
It
may
also
be
that
the
teeth
on
the
pInion
flywheel
ring
gear
or
both
are
worn
down
too
far
to
engage
properly
3
Starter
engages
but
will
not
dISengage
when
IgmtlOn
switch
IS
released
TIns
trouble
is
usually
caused
by
a
sticking
sole
nOid
but
occasionally
the
pmlOn
can
jam
on
the
flywheel
With
manual
transmissions
the
pinion
can
be
temporanly
freed
by
rockmg
the
car
in
high
gear
Naturally
this
IS
not
poSSible
in
auto
matics
the
starter
must
be
removed
4
Loud
grinding
noISes
when
starter
runs
TIns
usually
means
the
teeth
on
the
pinion
and
or
flywheel
are
not
meshing
properly
It
may
also
mean
the
over
running
clutch
IS
broken
In
the
first
case
remove
the
starter
and
examine
the
gear
teeth
In
the
latter
remove
the
starter
and
replace
the
pmion
dnve
assembly
CHARGING
SYSTEM
Charging
system
troubles
may
be
in
the
alter
nator
voltage
regulator
or
fan
belt
The
follow
ing
symptoms
are
typical
1
Alternator
warning
lamp
does
not
come
on
when
IgmtlOn
is
turned
on
This
may
indicate
a
defective
ignition
switch
battery
voltage
regulator
or
lamp
Frrst
try
to
15
HEAD
GASKET
LEAK
Roats
between
5
19
16
RESTRICTm
EXHAUST
SYSTEM
Normal
when
first
started
Drops
to
0
as
rpm
Increases
May
eventually
rrse
to
about
16
start
the
car
If
it
doesn
t
start
check
the
igllltlon
sWitch
and
battery
If
the
car
starts
find
the
voltage
regulator
and
disconnect
the
wlute
red
Wire
this
is
the
lamp
wire
Ground
the
wire
If
the
lamp
hghts
the
voltage
regulator
is
defective
not
properly
grounded
try
tightening
the
mounting
screws
or
the
alternator
brushes
are
not
contactmg
the
commutator
If
the
lamp
does
not
light
when
the
wire
IS
grounded
the
lamp
is
probably
burned
out
replace
It
2
Alternator
warning
lamp
comes
on
and
stays
on
This
usually
mdicates
that
no
chargmg
is
takmg
place
Frrst
check
the
fan
belt
tension
and
adlust
if
necessary
Check
the
battery
condition
with
the
hydrometer
and
check
all
electrical
connec
tions
m
the
chargmg
system
Fmally
isolate
the
trouble
to
the
alternator
or
voltage
regulator
3
Alternator
warmng
lamp
flashes
erratically
This
usually
indicates
the
chargmg
system
is
workmg
intermittently
Check
the
fan
belt
ten
sion
and
all
electncal
connections
m
the
charg
ing
system
Check
alternator
brushes
and
cODlh
tlon
of
the
commutator
4
Baltery
reqUires
frequent
additiOns
of
water
or
lamps
require
frequent
replacement
The
alternator
IS
probably
overchargmg
the
bat
tery
The
voltage
regulator
is
probably
faulty
check
it
using
the
procedures
given
in
Chaper
Nme
5
ExceSSive
noISe
from
he
alternator
Check
for
loose
alternator
mountmg
The
Page 18 of 252
TROUBLESHOOTING
13
trouble
may
also
be
worn
bearings
Remove
the
alternator
and
repair
ENGINE
These
procedures
assume
the
starter
cranks
the
engme
over
normally
If
not
refer
to
Starter
section
m
this
chapter
1
Engme
won
t
start
Could
be
caused
by
the
IgOltlon
or
fuel
problems
First
determine
If
high
voltage
to
spark
plug
occurs
To
do
thiS
dISconnect
one
of
the
spark
plug
wires
Hold
the
exposed
wrre
termlOal
y
to
Y2
lOch
from
ground
any
metal
in
engine
com
partment
With
an
msulated
screwdriver
Crank
the
engme
over
If
sparks
do
not
Jump
to
ground
or
the
sparks
are
very
weak
the
trouble
may
be
10
the
IgnitIOn
system
See
Ignition
System
Trou
bleshootmg
to
further
check
If
sparks
occur
properly
the
trouble
may
be
10
the
fuel
system
See
Fuel
System
Troubleshootmg
2
Engme
misses
steadily
Remove
one
spark
plug
wrre
at
a
tune
and
ground
the
wrre
If
engme
mISs
increases
that
cyhnder
was
work
109
properly
Reconnect
the
wire
and
check
the
others
When
a
wire
IS
dIs
connected
and
engme
miss
remams
the
same
that
cylinder
IS
not
finng
Check
spark
as
descnbed
10
Step
1
If
no
spark
occurs
for
one
cyhnder
only
check
dlStnbutor
cap
wrre
and
spark
plug
If
spark
occurs
prop
erly
check
compressIOn
and
mtake
maOlfold
vacuum
to
ISolate
the
trouble
3
Engme
misses
erratlcally
at
all
speeds
Interrmttent
trouble
can
be
difficult
to
find
It
could
be
ill
the
Ignition
system
exhaust
system
or
fuel
system
Follow
troubleshooting
proce
dures
for
these
systems
carefully
to
isolate
the
trouble
4
Engme
misses
at
Idle
only
Trouble
could
exist
anywhere
ill
IgOltlon
system
Follow
Ignition
TroubleshootlOg
procedure
care
fully
Trouble
could
also
eXist
10
the
carburetor
Idle
crrcult
Check
Idle
mIXture
adjustment
and
check
for
restnctions
m
the
idle
crrcUlt
5
Engme
misses
at
high
speed
only
Problems
could
be
ill
the
fuel
or
IgOltlon
systems
heck
accelerator
pump
operation
fuel
pump
dehvery
fuel
hnes
etc
as
descnbed
under
Fuel
System
Troubleshootillg
Also
check
spark
plugs
and
wrres
6
Low
performance
at
all
speeds
poor
acceleratIOn
Trouble
usually
ill
IgOltlon
or
fuel
system
Check
each
With
the
appropnate
troubleshooting
pro
cedure
7
ExceSSive
fuel
consumptIOn
Could
be
caused
by
a
Wide
variety
of
seemmgly
unrelated
factors
Check
for
clutch
shppage
brake
drag
defective
wheel
beanngs
or
poor
front
end
alignment
Check
IgOltlOn
system
and
fuel
system
8
011
pressure
lamp
does
not
light
when
IgmtlOn
switch
IS
on
Check
the
alternator
warning
lamp
If
it
ISn
t
on
either
go
to
Step
1
Chargmg
System
Trouble
shootlOg
If
only
the
oil
pressure
lamp
IS
off
open
the
englOe
compartment
hd
and
locate
the
oil
pressure
sender
on
the
block
near
the
oil
filter
Make
sure
the
wrre
is
connected
to
the
sender
and
makmg
good
contact
Pull
the
wrre
off
and
ground
it
If
the
lamp
hghts
replace
the
sender
If
the
lamp
does
not
light
replace
the
lamp
9
011
pressure
lamp
lights
or
flickers
when
engme
IS
runmng
Indicates
low
or
complete
loss
of
oil
pressure
Stop
the
englOe
unmedmtely
coast
to
a
stop
With
the
clutch
dISengaged
Tlus
may
simply
be
caused
by
a
low
oil
level
or
an
overheatmg
en
glOe
Check
the
oil
level
and
fan
belt
tensIOn
Check
for
a
shorted
oil
pressure
sender
with
an
ohmmeter
or
a
contlOulty
tester
Remove
and
clean
the
oil
dipstick
and
check
oil
level
and
condition
RepleOlsh
or
replace
the
oil
as
re
qurred
Listen
for
unusual
nOISes
mdlcatmg
dam
aged
beanngs
etc
Do
not
re
start
the
engine
until
you
know
why
the
hght
went
on
and
are
sure
that
the
problem
has
been
corrected
IGNITION
SYSTEM
This
procedure
assumes
the
battery
IS
ill
good
enough
condition
to
crank
the
engme
at
a
normal
rate
Page 19 of 252
14
CHAPTER
THREE
I
No
spark
to
one
plug
The
only
possible
causes
are
a
defective
dlStri
butor
cap
or
spark
plug
wrre
Examme
the
dis
tnbutor
cap
for
mOisture
drrt
or
carbon
track
ing
caused
by
flashover
cracks
etc
2
No
spark
to
any
plug
ThlS
could
mdicate
trouble
in
the
prImary
or
secondary
Circuits
Frrst
remove
the
coil
wire
from
the
center
post
of
the
dlStributor
Hold
the
Wire
end
about
1
1
mch
from
ground
With
an
msulated
screwdrIver
Crank
the
engme
H
sparks
are
produced
the
trouble
is
m
the
rotor
or
distributor
cap
Remove
the
cap
and
check
for
burns
mOisture
dirt
carbon
trackmg
cracks
etc
Check
the
rotor
for
excessive
burn
mg
pittmg
or
cracks
Replace
both
rr
necessary
H
the
cod
does
not
produce
any
spark
check
the
secondary
Wire
for
opens
H
the
wrre
is
good
turn
the
engme
over
so
the
breaker
pomts
are
open
Examme
the
points
for
excessIVe
gap
burmng
pittmg
and
looseness
Replace
and
ad
Just
rr
necessary
With
the
points
open
check
voltage
to
ground
at
the
cod
with
a
voltmeter
or
test
lamp
If
voltage
is
present
the
cOlllS
prob
ably
bad
Have
it
checked
or
substitute
a
known
good
one
If
voltage
is
not
present
check
wrre
connec
tions
to
cOll
and
distrIbutor
Temporanly
dIs
connect
the
Wire
from
the
distrIbutor
to
the
cOll
and
measure
from
the
coli
to
ground
If
voltage
is
present
the
distnbutor
lS
shorted
Examme
the
breaker
pomts
and
connecting
WIres
care
fully
If
voltage
is
still
not
present
check
the
other
coli
termmal
for
ground
Voltage
at
thiS
termmal
but
not
at
the
other
mdicates
a
defecnve
cOll
No
voltage
at
tlus
termmal
mdicates
an
open
Wire
between
the
termmal
and
the
battery
3
Weak
spark
If
the
spark
lS
so
small
it
cannot
Jump
from
the
wrre
to
ground
check
battery
condinon
Other
causes
are
bad
breaker
points
condenser
m
correct
breaker
pomt
gap
dirty
or
loose
con
necnons
m
the
pnmary
crrcuit
or
dirty
or
burned
rotor
or
distnbutor
Also
check
for
worn
dis
tnbutor
cam
lobes
4
Mlssmg
ThiS
is
usually
caused
by
fouled
or
damaged
plugs
plugs
of
the
wrong
heat
range
or
mcorrect
plug
gap
Clean
and
regap
the
spark
plugs
flus
trouble
can
also
be
caused
by
weak
spark
see
symptom
3
or
mcorrect
igmnon
tlIDing
5
Spark
polarity
Less
voltage
is
requrred
to
cause
electron
flow
from
a
relatively
hot
electrode
to
a
cooler
elec
trode
Smce
the
center
electrode
is
hottest
this
electrode
should
be
negative
Electron
flow
lS
then
from
the
center
electrode
to
the
outer
elec
trode
From
20
to
40
percent
more
voltage
is
requrred
to
cause
electron
flow
from
the
outside
electrode
to
the
hotter
center
electrode
This
occurs
when
the
spark
voltage
is
positive
The
cOll
wrres
must
be
connected
correctly
FUEL
SYSTEM
Fuel
system
troubles
must
be
iSolated
at
the
carburetor
fuel
pump
or
fuellrnes
These
pro
cedures
assume
that
the
igmtlon
system
has
been
checked
and
properly
adjusted
I
Engme
Will
not
start
Frrst
detenmne
that
fuellS
reachIng
the
carbu
retor
Remove
the
au
cleaner
look
into
the
carburetor
throat
and
depress
the
accelerator
several
tlIDes
There
should
be
a
stream
of
fuel
from
the
discharge
tube
each
time
the
accelerator
lS
depressed
If
not
the
fuel
pump
lS
not
dehver
mg
fuel
to
the
carburetor
or
the
float
system
m
the
carburetor
lS
not
workmg
Make
certam
there
is
fuel
m
the
fuel
tank
Check
the
automatic
choke
rr
so
equipped
to
make
certain
it
is
not
stuck
If
necessary
rebudd
the
fuel
pump
or
overhaul
the
carburetor
whichever
lS
determmed
to
be
faulty
2
Engme
runs
at
fast
Idle
Usually
thiS
is
caused
by
misadJustment
of
the
carburetor
idle
setting
Readjust
as
required
3
Rough
Idle
or
engme
miss
with
frequent
stallmg
Check
idle
miXture
and
idle
speed
adjustments
Inspect
the
overall
conchtlOn
of
the
carburetor
for
foreign
material
and
clean
or
overhaul
as
required
4
Engme
diesels
contmues
to
run
after
engme
IS
turned
off
Check
idle
IDlXture
and
idle
speed
adjustments
Page 20 of 252
TROUBLESHOOTING
15
5
Stumbling
when
acceleratmg
from
Idle
Check
accelerator
pump
diaphragm
and
Idle
speed
adjustment
6
Engine
mISses
at
hIgh
speed
or
lacks
power
This
mdlcates
pOSSible
fuel
starvatIon
Check
fuel
pump
pressure
and
capacIty
Clean
main
Jet
and
float
needle
valve
7
Black
exhaust
smoke
Black
exhaust
smoke
means
a
badly
ovemch
nuxture
Check
Idle
mIXture
and
Idle
speed
ad
Justment
Check
for
excessive
fuel
pump
pres
sure
or
blocked
return
hne
from
carburetor
to
fuel
tank
Check
for
leaky
float
or
worn
needle
valve
8
ExceSSIve
fuel
consumptIOn
ThIS
may
be
another
mdIcatIon
of
an
ovemch
fuel
mixture
Check
that
automatIc
choke
oper
ates
If
so
eqUIpped
or
that
the
manual
choke
contraIlS
not
being
left
out
Check
Idle
mIXture
and
Idle
speed
Check
for
excessIve
fuel
pump
pressure
leaky
float
or
worn
needle
valve
Make
certam
that
jets
are
the
proper
SIZe
Fuel
Pump
Pressure
Testing
1
Install
a
T
fittmg
m
the
fuel
hue
close
to
the
carburetor
2
Connect
a
fuel
pressure
gauge
to
the
fittmg
WIth
a
short
tube
3
Check
fuel
pump
pressure
as
described
in
the
Fuel
System
chapter
EXHAUST
EMISSION
CONTROL
The
followmg
symptoms
as
ume
you
have
ad
justed
the
Ignition
and
carburetor
to
specdicatIon
and
that
you
have
checked
the
results
on
an
accurate
exhaust
gas
anajyzer
1
CO
content
too
low
Make
sure
Idle
speed
IS
not
too
low
Check
Idle
mIXture
adjustment
too
lean
Check
carbu
retor
Jets
and
channels
Clean
and
or
replace
as
necessary
Check
engme
condition
With
a
com
pressIOn
and
vacuum
test
2
CO
content
too
hIgh
Check
Idle
mixture
adjustment
too
nch
Check
for
dIrty
air
cleaner
and
defectIve
automatIc
choke
If
so
equipped
Check
carburetor
Jets
and
channels
Clean
and
or
replace
as
necessary
Check
engme
condItIon
WIth
compression
and
vacuum
test
3
Hydrocarbon
level
too
hIgh
Check
that
Idle
speed
and
mIXture
adjustments
are
to
specIfication
Check
spark
plug
condItIon
and
gap
Check
breaker
pomts
Check
IgnItIon
tnumg
too
early
Check
mtake
mamfold
for
leaks
Check
valve
clearance
too
small
Check
condItIon
of
valves
With
compressIOn
test
MANUAL
CLUTCH
1
SlIppage
ThiS
is
most
noticeable
when
acceleratIng
m
a
hIgh
gear
at
relatIvely
slow
speed
To
check
slip
page
park
the
car
on
a
level
surface
WIth
the
handbrake
set
ShIft
to
2nd
gear
and
release
the
clutch
as
If
drlVing
off
If
the
clutch
is
good
the
engme
will
slow
and
stall
If
the
clutch
shps
con
tInued
engme
speed
will
gIve
It
away
CAUTION
ThIS
IS
a
severe
test
Perform
only
when
slippage
IS
suspected
not
penodlcally
Shppage
results
from
IDSufliclent
clutch
pedal
free
play
all
or
grease
on
the
clutch
disc
worn
pressure
plate
or
weak
sprmgs
Also
check
for
bIndIng
m
the
clutch
cable
and
lever
arm
which
may
prevent
full
engagement
2
Drag
or
failure
to
release
ThIS
problem
usually
causes
dIfficult
shIftIng
and
gear
clash
espeCially
when
downshIftmg
The
causes
may
be
excessive
clutch
pedal
free
play
warped
or
bent
pressure
plate
or
clutch
dISC
ex
cessive
clutch
cable
guide
sag
and
broken
or
loose
clutch
lmings
Check
conditIOn
of
mam
shaft
splines
3
Chatter
or
grabbing
A
number
of
thmgs
can
cause
tIns
Check
cable
gUIde
sag
and
tIghtness
of
transnusslOn
to
frame
and
engme
to
transmlSslon
mountIng
bolts
Check
for
worn
or
mISaligned
pressure
plate
and
misalIgned
release
plate
4
Other
nOIses
NOISe
usually
mdlcates
a
dry
or
defective
release
bearIng
Check
the
beanng
and
replace
If
neces