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Section
2
Engine
Tune-Up
(6)
CLEAN AIR CLEANER AND FUEL PUMP
BOWL. Clean
the
air
cleaner,
and
re-oil
the
element
(dry-type).
If
the
air
cleaner
is
the
oil
bath-type,
refill
to
the
indicated
level
with
engine
oil
of
the
specified
viscosity.
Remove
and clean
the
fuel pump
bowl. Install
a new
filter. Install
the
sediment
bowl
and a new gasket.
b. Major Tune-Up.
A
major
tune-up
consists
of
checking
the
cylinder
com
pression,
the
ignition
system,
the
fuel
system, the
engine
vacuum,
and
adjusting
the
valves.
(1)
CLEAN
AND INSPECT BATTERY CABLES.
Remove
the
cables
from
the
battery. Clean
the
battery
terminals
and cable connectors.
Inspect
the
battery
case
for
cracks
and
leaks. Fill
to the
proper
water
level. Re
place
deteriorated
connectors,
and cables
that
are shorted
or
have
worn
insulation. Brush
the
cable connectors
with
grease
to
retard
corrosion.
Connect
the
cables
to the
battery.
(2)
TEST
CHARGING SYSTEM.
Test
the
battery,
and recharge
or
replace
it,
if
necessary, to
insure dependa
ble
service.
Check
the
charging
circuit, the
generator
output,
and
the
regulator.
Repair
or
replace
a
faulty
generator.
Adjust
or replace
the
regulator
if
necessary.
(3)
TEST CYLINDER COMPRESSION. Follow
the
procedure given
under,
"a. Minor
Tune-Up."
(4)
CHECK MANIFOLD BOLT TORQUE. Tighten
the
intake
and
exhaust manifold
bolts
and
nuts
to
23-28
foot-pounds
torque.
(5) CLEAN,
ADJUST,
AND
INSTALL
SPARK
PLUGS.
Sandblast
the
spark
plugs,
wipe
the
porcelain
clean,
file
the
electrode
tips
flat,
and
adjust
the
spark
gap.
Test
the
plugs
in
an
approved
spark
plug
tester.
Replace
any
plugs
that
have broken
or
chipped
porcelain,
badly
burned
electrodes,
or
that
do
not
check
satisfac
torily
on
the
tester.
Install
the
spark
plugs,
and
tighten
them
to the
specified
torque.
(6)
TEST
DISTRIBUTOR.
Test
the
distributor
vacuum
advance on a suitable
distributor
test stand,
and
make
adjustments, repairs,
or
replacements
as required.
Set
the
distributor
point
gap
at
0.014-0.016 inch (8-cylin
der
engine)
or
0.024-0.026 inch (6-cylinder
engine).
After
setting
the gap,
check
the
point
dwell.
The
point
dwell
should
be
35-38 degrees (6-cylinder
engine),
and
26-28
Vi
degrees (8-cylinder
engine).
If
the
dwell
angle
is
not
correct
at
the
specified point
gap, the
distributor
cam
is
worn
or
the
point
assembly
is damaged. Replace
the
necessary
parts.
Lubricate
the
distributor
cam
lightly
with
distributor
cam
lubricant.
(7)
CLEAN AND INSPECT THE DISTRIBUTOR
CAP. Inspect
the
distributor
cap for
cracks
or
other
damage. Terminal
housing
sockets
should
be free
from
corrosion.
(8)
TIME
IGNITION. Before
connecting the
vacuum
line
between
the
distributor
and
carburetor,
start
the
engine and operate
it
at
idle
speed.
Check
the
timing
with
a
timing
light
and
make
the
necessary
adjustments.
Connect
the
distributor
vacuum
line
after
completing
the
adjustment,
and
check
for ignition
advance.
(9
)
CHECK IGNITION
PRIMARY CIRCUIT. Check
the
primary
circuit
amperage
with
a suitable
test
machine.
The
amperage
draw
with
the
engine stopped should
be
5-5.5
amps.
With
the
engine
operating
at
idle
speed, the
amperage
draw
should
be
2.75-3.0
amps.
Visually
inspect
the
wires
for
faulty
insulation
and poor
connections.
(10)
TEST SPARK INTENSITY.
Determine
if
the
spark
from
each spark
plug
wire
will
jump
a
%6"
inch
gap.
If
the
spark
is
unsatisfactory
at
all
spark
plugs, trouble
exists
in
the coil,
condenser,
rotor or
cap,
internally
in
the
distributor,
or
in
the
external
primary
circuit.
If
the
spark
is
unsatisfactory
at some
but
not all
of
the
spark
plug
wires, the trouble
is in
the
wire
itself,
the
wire
is
not seated
in
the
housing
socket,
or
the
distributor
cap is
shorted.
(11)
CHECK AND ADJUST VALVE LASH.
Check
and adjust
the
valve
lash
after
the
engine
is
thoroughly
warmed
up.
(12)
TEST FUEL PUMP PRESSURE. Check
the
fuel
pump
pressure.
The
pressure should
be
within
4.0-5.0
p.s.i. at
900
r.p.m.
(13)
TEST FUEL PUMP VACUUM. Check
the
fuel
pump
vacuum.
If
the
vacuum
is below 10.5 inches
of
mercury,
or
if
the
vacuum
drops
rapidly
when
the
engine
is
stopped,
repair or replace
the
pump.
(14)
INSPECT AND CLEAN THE FUEL
PUMP.
Remove
and
clean
the
fuel pump bowl. Install
a
new
filter. Install
the
sediment
bowl
and a new
gasket.
(15)
CLEAN CARBURETOR.
Clean
the
carburetor
fuel bowl. Set
the
float
level,
and check
the
accelerator
pump
operation.
(16)
CLEAN AIR CLEANER. Clean
the
air
cleaner,
oil
the
element
(dry-type),
and
install. If
the
air
cleaner
is
the
oil
bath-type,
fill
to
the
indicated level
with
engine
oil.
(17)
TEST ENGINE
VACUUM.
Check
the
engine
manifold
vacuum at
idle
speed.
If
the
vacuum
is lower
than specified,
check
for
leakage
at
the
vacuum
lines
and
intake
manifold.
Check
the
car
buretor idle
adjustment.
If
the
vacuum
is
still
below
normal
or
is
erratic,
it is
an
indication
of
bad
rings, sticky valves,
weak
valve
springs,
or
leaking
gaskets.
If
this
condition
exists,
it
should
be
reported
to the
customer.
(18)
ADJUST
CARBURETOR IDLE. Connect
a
vacuum
gauge,
and
set
the
idle
speed
to specifications
with
a
tachometer
installed
on
the
engine.
Set
the
idle
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