Condition
ABNORMAL
COMBUSTION
backfue
afterflre
run
on
etc
Improper
ignition
timing
Fuel
system
out
of
order
Faulty
cylinder
head
etc
Others
EXCESSIVE
OIL
CONSUMPTION
Oilloak
Excessi
lo
oil
consumption
Others
Engine
Tune
up
probable
cause
Improper
ignition
timing
Improper
heat
range
of
spark
plugs
Damaged
carburetor
or
manifold
gasket
backfue
afterfire
Clol
l
ed
carburetor
jet
Improper
function
of
the
float
Uneven
idling
Run
on
Improperly
adjusted
B
C
D
D
set
pressure
Malfunction
of
anti
dieseling
solenoid
valve
Malfunction
of
auio
choke
Improperly
adjusted
valve
clearance
Excess
carbon
in
combustion
chamber
Damaged
valve
spring
backfire
afterflre
Malfunction
of
A
T
C
air
cleaner
Inoperative
ariti
backfue
valve
Loose
oil
drain
plug
Loose
or
damaged
oil
pan
gasket
Loose
or
damaged
chain
cover
gasket
Worn
oil
seal
in
front
and
rear
of
crankshaft
Loose
or
damaged
locker
cover
gasket
Improper
tightening
of
oil
filter
Loose
or
damaged
oil
pressure
switch
Cylinder
and
pioton
wear
Improper
location
of
piston
ring
gap
or
reversely
assembled
piston
ring
Damage
piston
rings
Worn
piston
ring
groove
and
ring
Fatigue
of
valve
oil
seal
lip
Worn
valve
stem
Inadequate
quality
of
engine
oil
Engine
overheat
ET32
Corrective
action
Adjust
ignition
timing
Use
specified
spark
plugs
Replace
them
with
new
parts
Disassemble
carburetor
and
check
it
Adjust
the
level
and
check
needle
valve
Adjust
Adjust
Check
or
replace
Adjust
Adjust
Remove
head
and
get
rid
of
carbon
Replace
it
with
a
new
one
Check
for
loose
vacuum
hoses
Replace
if
necessary
Replape
Tighten
it
Renew
gasket
or
tighten
it
Renew
gasket
or
tighten
it
Renew
oil
seal
Renew
gasket
or
tighten
it
but
not
too
much
Renew
gasket
and
tighten
it
with
the
proper
torque
Renew
oil
pressure
switch
or
tighten
it
Overhaul
cylinder
and
renew
piston
Remoun
t
piston
rings
Renew
rings
Repair
or
renew
piston
and
cylinder
Renew
piston
and
piston
ring
Replace
seal
lip
with
a
new
one
Renew
valve
or
guide
Use
the
designated
oil
Previously
mentioned
Engine
Fuel
REMOVAL
AND
INSTALLATION
Remove
air
cleaner
cover
2
Remove
hose
connecting
idle
compensator
and
3
way
connector
3
Loosen
screws
securing
idle
com
pensator
to
air
cleaner
then
remove
idle
compensator
Notes
a
When
removing
idle
compensator
remove
gasket
and
plate
b
When
removing
screw
securing
idle
compensator
to
air
cleaner
be
care
ful
not
to
miss
the
saew
4
To
install
reverse
the
removal
procedure
INSPECTION
I
Check
tha
t
valve
IS
m
closed
position
when
bi
metal
temperature
is
lower
than
operating
temperature
To
check
breathe
air
into
tube
or
suck
DESCRIPTION
The
fuel
fJlter
is
a
cartridge
type
It
uses
a
paper
element
which
can
be
checked
for
condition
from
the
out
side
EF718
Fig
EF
15
Location
of
idle
compenl
otor
air
If
excessive
air
leakage
is
found
at
the
valve
replace
idle
compensator
as
an
assembly
Note
that
two
idle
com
pensators
are
mounted
to
air
cleaner
and
that
it
is
necessary
to
plug
the
valve
of
one
of
these
idle
compensa
tors
so
as
to
prevent
air
leak
while
checking
the
other
one
@
CD
I
tl
1
Orifice
2
Rubber
valve
EF225
Fig
EF
16
Checking
idle
compelll
lor
FUEL
FILTER
1
Body
2
Paper
element
3
Cover
1
EFOO5
Fig
EF
18
Sectional
view
of
cartridge
type
fuel
filter
EF
8
Note
When
checking
idle
compensa
tor
on
vehicle
disconnect
hose
leading
to
idle
compensator
and
connect
other
hose
then
carry
out
check
as
descn
bed
above
2
When
bi
metal
temperature
is
above
the
specified
operating
tempera
ture
visually
check
to
see
if
the
valve
is
in
open
position
If
valve
is
not
open
replace
idle
compensator
as
an
assembly
Watcr
temperature
Observe
valve
11t
No
1
Bknctal
60
to
70De
140
to
1580F
NO
2
Bi
metal
70
to
900C
158to
1940F
EF226
Fig
EF
17
Checking
idle
compensator
3
Others
I
Check
hoses
for
correct
installa
tion
distortion
or
cracks
2
Check
rubber
valve
seat
of
idle
compensator
for
sticking
or
any
other
faulty
conditions
REMOVAL
Disconnect
inlet
and
outlet
fuel
lines
from
fuel
fJlter
and
remove
fuel
fJlter
Note
Before
disconnecting
fuel
lines
use
a
container
to
receive
the
fuel
remaining
in
lines
