Specifications

Tune
Up
Why
do
we
need
a
tune
up
The
whole
Idea of
keepmg
the
engme
tuned
IS
more
Important
today
than
It
ever was
m the
past
Air
quahty
and
the
scarcity
of fuels makes It
necessary
for
us to
change
our old habits
You benefit
drrectly by keepIng your
car
In
good
runmng
conditIon It wIll
operate
more
effiCiently
wluch
simply
means
more miles
per
gallon
or less
money
out of
your pocket
each
tIme
you
pull
up
to
the
gas pump
And
the air
we
all breathe
wIll be
cleaner
because
of
thiS better
runmng engme
Don t be
afraid
of
not
havmg
the
ablhty
to
do tlus kmd of work We
are
gOIng
to be
helpIng
you
These
str3Jghtforward
routmes
are
easily
un
derstood
and
by
their
nature wIll save
you
money
A tune
up
takes
some
tIme
though
so
plan
a half
day
s work
after
gettmg
all of
your
new
parts
Spark
plugs
and
alllgmtIon
parts
can
be
purchased
at
local
auto
accessory
stores
at
greatly
reduced
pnces
All
supphers
may
not
carry
all
brands of
spark plugs
but
your
suppher
Will
have
a
cross reference chart which Will
en
able him to
supply you
with
another
kmd of
spark plug havmg
the same
qualitIes
CHECKING
COMPRESSION
Before
domg any
tune
up
work
It
S
a
good
Idea
to
check the
engme
com
preSSIOn especially
If
your
car IS
usmg
too much
oIl You
don
t have to
make
a
compressIOn
test but If
you
do have
a
compressIOn problem
a tune
up
won t
be much
help
If the
engme compressIOn
IS
normal
then the lowest
readmg cyhnder
Will
be
at
least 75 of the
highest readmg cy
hnder
With
no
cylmder
readmg
lower
than 700
kPa
100
pSI
VariatIOns
be
tween
cyhnders
should
be
less
than
140
kPa
20
pSI
If the
engIne
does not
meet these
reqUirements
a
tune
up
Will
do lIttle
to
help
and
you
must deCide
whether
you
should consult
a
profes
SIOnal
mechamc
about
havmg
the en
gme
overhauled
It
might
be more
economical
to
swap
the
engme
If
you
can
locate
an
engme
at
a
salvage
yard
from a
wrecked car
Here
s how to
test
compressIOn
Label each
of
the
spark plug
wires so
you
can
easIly IdentIfy
which
plug they
were
removed
from Then
remove the
air
cleaner
assembly
and all of the
spark
plugs
Block the choke valve and the
throttle
valve
m the Wide
open
positIOn
Remove the thick wire from the
center
of
the
distrIbutor
cap
and
connect
It to
ground
the
engIne
block Obtam
a
compressIOn
gauge
and mstall It
Into
one of
the
spark plug
holes
USIng
the
IgmtlOn
key
crank
the
engIne
about
four
revolutIons
and record the
readmg
from
the
gauge
Contmue thiS
process
until all of
the
cylInders
have been
checked
Compare
the
readIngs
If
readmgs
are low
squut
about a tables
poon
of
engme
011
mto the
cylInders
at
the holes where the
spark
plugs
belong
Check the
compressIOn agaIn
If
the
readmgs
are
now much
higher
worn
piston
nngs
are mdlcated
and an
engme
overhaul
may
be
m
order
If
the read
mgs
do
not
Improve
burned valves
or
valves
not
seatmg
properly
may
be
the
likely
cause and a
valve
Job
may
be
needed
If
low
readmgs
are obt3Jned
from two
adjacent
cylInders
the cause
may
be
a
leaky
head
gasket
which
would
pemut
coolant to
get
Into the
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