Table of Contents
Advertisement
Chapter
I
General Engine Repair
ignition
system.
The
next most
likely
cause
is
a malfunc
tion
of
the
fuel
system.
A
simple check
will
determine
which
system
is
at
fault. Remove
one
wire
from
a
spark
plug,
and
insert
a
piece
of proper sized metal rod so
it
will
protrude
from
the
insulator. With
the
ignition
on
and
the
starter
turning
the
engine
over,
hold
the
end of
the
rod
approximately %G-inch
from
the
block.
If
no
spark
is
obtained,
check
the
ignition
system.
If
a
good
spark
is
obtained,
check
the
fuel
system.
(a)
No Spark. If
no
spark
was
obtained,
follow
the
steps
below
to
determine
the
cause and make
necessary
repairs
or replacements.
(
1
)
Pull
the
coil wire
from
the
top
of
the
distributor,
and
with
the
ignition
on
and
the
engine
turning
over,
see
if
there
is
a spark
at
this
point.
If
there
is
a good
spark, the
trouble lies in
the
distributor
cap, rotor,
or spark
plug
wires.
See
that
they
are
clean,
dry,
and
not
defective.
Repair
or
replace as necessary.
(2)
If
there
was no spark
in
(1)
clean
the
coil
tower
socket
or
replace
the
high
tension
wire
between
the
coil
and
distributor
and check again.
If
a weak
spark
exists,
the
points
are
probably
arcing.
Test
the
condenser,
replace
if
necessary
and adjust
the
points.
If
a
weak spark
persists, test the
coil and replace
if
necessary.
(3)
If
there
was no
spark
in
(2),
remove
the
distribu
tor
cap
and
see
if
the
points are
"breaking"
and
there
is
an
electrical
charge
to
the
points.
Adjust
or
replace
as
necessary.
If
there
is
spark
at
the points,
and
they
break
properly, the secondary
circuit
of
the
coil
is defective. If
there
is
no spark
at
the points;
install
a
"jumper"
between
the
distributor
post
of
the
coil and
the
distributor,
then
check
for
spark
at
the
points.
If
there
is
a
spark,
replace
the
coil
to
distributor
primary
wire.
If
there
is
no
spark,
install
a
"jumper"
between
the two
primary
coil
terminals
and
recheck.
Replace
the
coil
if
a
spark now exists at
the
points.
If
not,
install
a
"jumper"
between
the
battery
and
the
battery
post
of
the coil, then
check
the
spark at
the
points.
If
a
spark
exists, the
ignition
switch or
wiring
from
the
switch
to
the
coil
is defective
and
must
be
re
paired
or
replaced.
(b)
Weak Spark.
If
the
spark
test
at
the
spark
plug
showed
a
weak
spark,
perform
the
following
checks
in
the
order
listed:
(
1
)
Battery
may
be
weak.
Test,
recharge,
or
replace,
the
battery.
(2)
Remove
the distributor cap,
and
check
the
condi
tion
of
the
points.
Adjust,
clean,
or
replace
them
as
necessary.
Severly
pitted points
are
usually
an
indication
that the
voltage
regulator
is
improperly
set or
the
con
denser is faulty.
(3)
Check
the
condition
of
the rotor,
distributor
cap,
and
plug
wires.
The
wires
must
be
clean,
dry,
and must
be
fully
seated
in
the
terminals.
Always
replace
any
wire
which
is damaged
or
has
corroded
terminals.
(4)
If
the
weak
spark
persists, the
coil
should
be
tested
and replaced
if
necessary.
(c)
Good Spark. If
a good
spark was
observed,
check
the
fuel
system as
follows:
(1)
Check
the
fuel
supply
at
the
fuel
tank.
Do
not
attempt
any
other
fuel
system checks
before
doing
this.
(2)
If
there
is fuel in
the
tank,
check
to
see
if it is
reaching
the
carburetor.
Remove
the
air
cleaner,
and
look
down
the
carburetor
throat
while
working the throttle
by
hand.'
Each
time the throttle
is
worked,
a
spurt
of
gasoline should
be
emitted
from
the
accelerator
pump
discharge
nozzle.
If
there
is fuel
at
this point, the
engine
is
probably
flooded
or
there
is
water
in
the
fuel
system.
(3)
If
no
accelerator
pump discharge
is
observed
in
the
carburetor
throat, loosen the fuel
pump to
fuel
tank
line
at
the
fuel
pump.
Remove
the
fuel
tank
filler
cap.
If fuel
runs out
freely,
the
line is
clean.
If
not,
blow
the
line
out
by
air pressure
from
the
fuel
pump
end.
NOTE: Check
the
flexible
gas
line for
a
collapsed
condition.
(4)
If
the
fault has
not
been
found,
check
the
fuel
pump
pressure, then
repair or replace
the
fuel pump
or
carburetor.
(3)
ENGINE
STARTS
BUT
FAILS
TO
KEEP
RUNNING. The
most
probable
cause
of
this
malfunction
is
the
fuel
system.
The ignition
system sometimes
can
cause
trouble,
but it is usually
after
the
engine
has
run
for
some
time
and
is
at
operating temperature.
In
either
case,
check
the
fuel
system
first.
(a)
Check
the
fuel
supply
at
the
gas
tank.
(b) Try
to
start
the
vehicle.
If it
will
operate
with
constant
foot
throttle,
adjust
the
idle
speed
and
check
the
choke
adjustment.
(c)
If it
will not
operate with constant
foot
throttle,
remove
the
air
cleaner,
and check
to
see
if fuel is getting
to the
carburetor.
This is
done
by looking
down
the
car
buretor
while
operating
the throttle.
If
gasoline
is
observed
spurting from
the
accelerator
pump
discharge
nozzle, the
engine was either
flooded
or
the
fuel
system
has
water
in it.
(d)
If
no accelerator
pump
discharge is
observed
in
the
carburetor
throat,
loosen
the
fuel
pump
to
fuel
tank
line
at
the
fuel
pump.
Remove
the
fuel
tank
filler
cap.
If fuel
runs out
freely,
the
line is
clear.
If
not,
blow
the
line
out
with air
pressure
from
the
fuel pump
end.
NOTE:
Check
the
flexible
gas
line for
a
collapsed
condition.
(e)
If
the
cause of
the trouble
has
not
been
found,
check
the
fuel pump
pressure,
and repair
or
replace
the
fuel
pump
or
carburetor.
(f)
If
the
fuel
system
is
operating correctly
and
the
engine still
stalls,
it may be due
to the
coil or
condenser
breaking
down
under
operating temperature.
Check
and
replace as necessary.
Hide quick links:
Advertisement
Table of Contents
