carb DATSUN 210 1979 Service Manual

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Month

EMISSION
CONll
O
MMN1ENJl
NCE
P
P
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exhaust
a
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belU
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l
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0
11
0
filter
I

engine
COO
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I

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n
v
te
hO
conne
on
P
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titt1ng
hOleS
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ect
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e
conv
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call
QP
2
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1
h
t
olt
v
t
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0

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vel
filter

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net
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p
p
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tc
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ner
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ca
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conv
rto

V
S
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l

0
cI
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tnte
on
C
M
n
od
rh
c
ralV
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con
t8

carburetor
a
f

and
CB
3da
ff
lodels
P
P

p
o
e
p
r
control
o
n
P
f
l
I

grtltlOfl
tll1U

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plIJQ
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l

DATSUN
210
Model
8310
Series

SECTIONET

ET

ENGINE
TUNE
UP

CONTENTS

EMISSION
CONTROL
DEVICES

BASIC
MECHANICAL
SYSTEM

ADJUSTING
INTAKE
AND
EXHAUST

VALVE
CLEARANCE

CHECKING
AND
ADJUSTING
DRIVE

BELTS

CHANGING
ENGINE
OIL

REPLACING
01
L
FI
L
TER

CHANGING
ENGINE
COOLANT

CHECKING
COOLING
SYSTEM
HOSES

AND

CONNECTIONS

CHECKING
ENGINE
COMPRESSION

IGNITION
AND
FUEL

SYSTEM

CHECKING
BATTERY

CHECKING
AND
ADJUSTING

IGNITION
TIMING

CHECKING
IGNITION
WIRING

CHECKING
AND
REPLACING
SPARK

PLUGS

CHECKING
AND
ADJUSTING
CARBURETOR

IDLE
RPM
AND
MIXTURE
RATIO

CHECKING
CHOKE
MECHANISM

Choke

plate
and

linkage

CHECKING
FUEL
SHUT
OFF
SYSTEM

FU
models
ET
2

ET
3

ET
3

ET
3

ET
3

ET
3

ET
4

ET
4

ET
4

ET
5

ET
5

ET
5

ET
6

ET
6

ET
7

ET
9

ET
9
REPLACING
FUEL
FILTER
ET
10

CHECKING
FUEL
LINES

Hoses

piping
connections
etc
ET
10

REPLACING
AIR
CLEANER

FILTER
ETlO

CHECKING
AUTOMATIC
TEMPERATURE

CONTROL
AIR
CLEANER
ET
10

EMISSION
CONTROL

SYSTEM
ET
11

CHECKING
VACUUM
FITTING
HOSES

AND
CONNECTIONS
ET
11

REPLACING
AIR
PUMP
AIR
CLEANER
FILTER

Except
FU
models
and
Canada
models
E

1122i

REPLACING
AIR
INDUCTION
VALVE
FILTER

FU
models
and
Canada
models

E
tlil1r2
C

REPLACING
PCV
VALVE
AND
FILTER

ETf

CHECKING
VENTI
LATION
HOSES

E1P12

CHECKING
VAPOR
LINES

Eli
J2

CHECKING
FUEL
TANK
VACUUM
RELIEF
I

f
III

VALVE

ET
13

REPLACING
CARBON
CANISTER
W

FILTER
ET
d

SERVICE
DATA
AND

SPECIFICATIONS
ET
14

TROUBLE
DIAGNOSES
AND

CORRECTIONS
ET
16

SPECIAL
SERVICE
TOOL
ET
23

f

EMISSION
CONTROL
DEVICES

En
ine
model
I
AI4
I
A1S

B310
Non
CaliCor

Non
California
models
Califor
nia

Car
model
California
models
E
cept
for
C
nada
Canada
nia
modeb

models
Except

for

Canada

M
T
M
T
A
T

Ti
ansmiuion
M
T
A
T
Except
A
T
FU
M
T
A
T
Station
Wagon

FU
models
models
models

AIR
CLEAN
I
A
T
C
air
cleaner
I
X
I
X
X
I
X
I
X
I
X
I
X
I
X
X

ER
Idle
compensator
Dual
type
X
I
X
X
I
X
I
X
I
X
I
X
I
X
X

Fresh
air
duct
X
I
X
X
I
X
I
X
I
I
I
X
X

ENGINE
I
Early
fuel
evaporative
system
X
I
X
X
xl
X
I
X
I
X
I
X
X

BASE
Exhaust
gas
type

CARBV
I
P
T
C
auto
choke
X
I
X
X
X
I
X
I
X
I
X
I
X
X
m

RETOR
I
l

Thr
ttle
opener
X
X
X
X
I
I
X
I
X
I
X
X
Q

I
Fuel
shut
off
system
I
X
I
I
I
3

m
ll

i
Dash
po
t
X
X
X
X
I
X
I
X
I
X
I
X
X

N
l

IGNITION
I
H
I
C
ignitor
X
X
X
X
I
X
I
X
I
X
I
X
X
c

SYSTEM
Spark
timing
contra
system
T
e
S
X
X
X
I
I
I
I
l

X
X
I
X
ll

Thermal
vacuum
valve
X
X
X
I
X
I
I
I
I
X
X
c

Vacuum
delay
valve
X
I
X
I
I
I
X
I
0

X

A
I
S
I
Air
pump
Air
pump
air
cleaner
check
valve
I
X
X
I
X
I
X
I
I
I
I
x
X

A
B
valve

Combined
air
control
C
A
C
valve
I
X
X
I
I
I
I
I
I
X

Relief
valve
I
I
X
I
X
I
I
I
I
X

Air
induction
valve
Filter
A
B
valve
I
I
I
I
X
I
X
I
X

E
G
R
I
Exhaust
gas
recirculation
E
G
R
valve
I
X
I
X
I
X
I
X
I
X
I
X
I
X
I
X
X

SYSTEM
Thetmalvacuum
valve
I
X
I
X
I
X
I
X
I
X
I
X
I
X
I
X
X

Back
pressure
transducer
B
P
T
valve
I
X
I
X
I
X
I
X
I
X
I
I
I
X
X

CATALYZER
I
CatalytJc
converter
I
X
I
X
I
I
I
X
I
I
I
X

Newly
equipped
unit
on
1979
models
M
T
Manual
transmission

Remarks
X
Available
A
T
Automatic
transmission

Not
available
A
T
C
Aute
matic
tempeJ
ature
control

P
T
C
POlitive
temperature
coefficient

A
I
S
Air
injection
system
or
Air
induction
system

A
B
valve
Anti
backfire
valve

CHECKING
AND

ADJUSTING

CARBURETOR
IDLE

RPM
AND
MIXTURE

RATIO

WARNING

a
0

n
a
utomatic
transmission

models
checks
should
be

per

formed
with
the
lever
shifted
to

the
0

position
Be
sure
to

engage
parking
brake
and

to
lock

both
front
and

rear
wheels
with

wheel
chocks

b

Oepress
brake

pedal
while
ac

celerating
the

engine
to

prevent

forward

surge
of
car

c
After
idle

adjustment
has
been

made
shift
the
lever
to
the
N

or
P

positfon
and

remove

wheel
chocks

CAUTION

00
not

attempt
to
screw
the
idle

adjusting
screw
down

completely
00

ing
so
could

cause

damage
to

tip

which
in
turn
will
tend
to
cause

malfunctions

Note

a
When

measuring
CO

percentage
in

sert

probe
into
tail

pipe
more
than

40
cm

15
7

in

b
In

thee
case
of
air

conditioner
e

quipped
models
the
idle

adjust

ment

should
be
carried
out
while

the
air

conditioner
is

OFF

c
When
making
idle

adjustment
do

not

removt
air
cleaner

CO

Idle
adJustment

with
CO
meter

Idle
mixture

adjustment
requires

the
use
of
a
CO
meter

especially
for

California
models
When

preparing
to

adjust
idle
mixture
it
is

essential
to

have

the
meter

thoroughly
warmed

up

and
calibrated

1

Check
carburetor

pipes
for

proper

connection

2
Warm

up
engine
until
water
tern

perature
indicator

points
to
the
middle

of

gauge
The

procedure
to
warm

up

J
Engine
Tune

up

engine
is
not

specifically
recom

mended
Either

driving
car
or

operat

ing
engine
at
no
load
will
be

good

3
Make
sure

that
water

temperature

indicator

points
to
the

middle
Further

keep
engine

running
at
about
2
000

rpm
for
about
5

minutes
without

applying
load
to

engine
in
order
to

stabilize

engine
condition

Engine

hood
should
be

open

4
Run

engine
for
about

10
minutes

at

idling
speed

During
this
10

minutes

proceed
as
described
in

steps

5

to
9
below

5

I
Disconnect
air
hose
from
air

check
valve
and
install

cap
on
air

check

valve

Except
Canada
and
FU

models

EF244

Fig
ET
11
Disconnecting
Air
Hose

from
Air
Check
Valve

Except
Canada
and
FU
models

Canada
and
FU
models

2

Disconnect
air

hose
from
air

induction

pipe
and
install

cap
on
air

induction

pipe
Canada
and
FU
mod

els

EF849

Fig
ET
12

Installing
Cap
on
Air

Induction

Pipe

FU
models

3

On
FU
models
disconnect
dis

tributor
vacuum
hose
at
distributor

diaphragm
side

and

plug
hose
with

blind

plug

ET
7
ET501

Fig
ET
13

Disconnecting
Distributor

Vacuum
Hose

6
Race

engine
I
500

to
2
OOO

rpm

two

or
three
times

under
no
load
then

run

engine
for

one
minute

at

idling

speed

7

Adjust
throttle

adjusting
screw

until

engine
is
at

specified
speed

Engine
speed

Manual
transmission

700
rDm

Automatic

transmission

in
0

position

650

rpm

2

Fig
ET
14
Throttle
Adjusting
Screw

and
Idle

Adjusting
Screw

8

Check

ignition
timing
If
neces

sary
adjust
it
to

specifications

This

operation
need
n
t
be
carried

out
at
1
600
km
1

000
miles
service

Ignition
timing

Manual
transmission

50
B
T
0
C
f700

rpm

California
FU
models

100

B
T
O
C

noo

rpm

Non
California
Canada

models

Automatic
transmission

in
0

position

50
B
T
0
CJ650

rpm

California
model

SO
B
T
D
C

650

rpm

Non
California
models

except
Canada

100
B
T
0
C
650

rpm

Canada
models

Note
On
FU

models

ignition
timing

t
under
a

con4ition
where

distnoutor

vacuum
hose

is
discon

nected

9
On

FU
models

proceed
as
fol

lows

I
Remove
blind

plug
from
dis

tributor
vacuum
hose
and
connect

hose

to
distributor

diaphragm

EC370A

Fig
ET
15

Connecting
Distributor

Vacuum
Hose

2
If

engine
speed
varies
in
this

state
set
idling
speed
at

specified
value

with
throttle

adjusting
screw

10
At

about
10

minutes
after
en

gine
is

run
at

idling
speed

adjust
idle

adjusting
screw
so
that
CO

percentage

is
at

specified
level

CO

percentage

Manual
transmission

2
t
1
at
700

rpm

Automatic
transmission

in
0

position

2
t
1
at
650

rpm

II

Repeat
procedures
as
described

in

steps
6
7
and

10
above
so
that
CO

percentage
is

at

specified
level
Check

ing
idle
CO
in

step
10
can
be

carried

out

right
after

step
7
Engine
Tune

up

11
Race

engine
1
500
to
2
000

rpm
two

or
three
times
under

no
load

and

make

sure
that

specified
CO

per

centage
is
obtained

13

I
Remove

cap
and

connect
air

hose
to

air
check

valve

Except

Canada
and
FU

models

2

Remove

p
and

connect
air

hose
to
air
induction

pipe
Canada

and

FU
models

If

engine
speed
increases

readjust
it

to
the

specified
speed
with
throttle

adjusting
screw

14
On
FU
models

proceed
as

follows

Open
throttle
valve

by
tuming

throttle
shaft

then
close
it

And
make

sure
throttle

valve
switch
of
fuel

shut

off

system

operates
click
sound
is

heard

or

continuity
turns
to

OFF

when

throttle
valve
is

closed

If
not

adjust
throttle
valve

switch

In
air
conditioner

equipped
models

inspection
in

step
13
should
be

carried
out
when

engine
is

running

with
air
conditioner
in
ON

F

l
CD
is
actuated

Refer
to

Checking
Fuel
Shut
off

System
in
this
section

CO
Idle

adjuatment

without
CO

mater

If
CO

meter
is
not

available
the

following
procedures

may
be

used

I

Check
carburetor

pipes
for

proper

comiection

2
Warm

up
engine
until
water
t
m

perature
indicator

points
to
the

middle

of

gauge
The

procedure
to

warm

up

engine
is
not

specifically
recom

mended
Either

driving
car
or

operat

ing
engine
at
no

load
will
be

good

3
Make

sure
that
water

temperature

indicator

points
to
the

middle
Further

keep
engine

running
at
about
2
000

rpm
for

about
5
minutes

without

applying
load
to

engine
in
order

to

stabilize

engine
condition

Engine

hood
should
be

open

4

Run

engine
for
about
10

minutes

at

idling

speed
During
this

10

minutes

proceed
as
described
in

steps

5
to
9
below

5

I
Disconnect
air

hose
from
air

check
valve
and

install

cap
on
air

ET
8
check
nlve

Except
Canada
and
FU

models

2
Disconnect
air

hose
from
air

induction

pipe
and
install

cap
on
air

induction

pipe
Canada
an
FU

models

3
On

FU
models

disconnect
dis

tributor

vacuum
hose

at
distributor

diaphragm
ide
and

plug
hose
with

blind

plug

6
Race

engine
1
500
to
2
000

rpm

two
or

three
times

under
no
load
then

run

engine
for

one
minute

at

idling

speed

7

Adjust
throttle

adjusting
screw
to

that

engine
speeds
are

as
indicated

below

Engine
speed

Manual
tra
mi
ion

except
FU
models

740

rpm

Automatic

transmission

in
0

position

665

rpm

FU
models

765

rpm

8
Check

ignition
timing
if
neces

sary
adjust
it

to
the
value

required
by

specifications
This

operation
need
not

be
carried
out
at
1

600
km

1
000

miles
service

9
On
FU
models

proceed
as
fol

lows

I
Remove
blind

plug
from
dis

tributor
vacuum
hose
and
connect

hose
to

distributor

diaphragm

2

If

engine
speed
varies
in
this

state
set

idling
speed
at

specified
value

given
in

step
7
with

throttle

adjusting

screw

10
At
about
10
minutes
after
en

gine
is

run
at

idling
speed
adjust
idle

adjusting
screw
until
maximum

rpm
is

obtained

II

Repeat

procedures
as
described

in

steps
6
7
and
10

above
until

engine

speed
at
best
idle
mixture
is

as

specified
in

step
7

Adjustment
in

step

10
can
be
carried
out

right
after

step

7

12
Turn

the
idle

adjustIng
screw

clockwise
until

engine

speed
drops
by

value

given
below

Engine
speed
drops

Manual
transmission

except
FU
models

make

sure
throttle
valve

operates

click

sound
is
heard

or

continuity

turns
to

OFF
when

engine
speed

decrease
to

idling

If

not

adjust
throttle
valve
switch

Fig
ET
19

AdjlUting
Throttle
V
ve

Switch

FU
models

If
throttle

valve
switch

g1f1not
be

adjusted
to

specification

replace
Engine
Tune

up

Note

If
it
is
difrlCUlt
to

judge
open

tion
of
throttle
valve

switch

by

hearing
Click
sound
caused

by

microswitch
check

as
follows

1

DiscollI
ecl

throttle
va1ve

switch

ronnector

and
connect
circuit

tester
to
throttle
va1ve
switch

2

Run

engine
under

no
load

Increase

engine
speed
slowly
and
make
sure

it
is

within
the

specified
range
when

throttle
valve
switch
is
turned

on

Then
decrease

engine
speed
slowly

and
make
sure
it
is

within
the

specified
range
when
throttle
va1ve

switch
is

turned
off

If
not

adjust
throttle
valve
switch

3
Make

sure

continuity
of
throttle

vaIve
switch
turns

to
OFF
in
the

operation
desaihed

in

step
6

Engine
operation
Engine
speed
when

throttle
valve

switch

operates
Throttle

valve
switch

continuity

When

engine
speed

increases
1

150
i200

rpm

1

000
1
200

rpm
When

engine
speed

decreases

REPLACING

FUEL

FILTER

I

Check
for
a

contaminated
filter

and

water

deposit

0

9

ET011

Fig
ET
20
Fuel
Filter

All

engines
use
a

replaceable
car

tridge
type
fuel
filter
as
an

assembly

2

Replace
fuel
filter
in
accordance

with
maintenance

schedule
OFF

ON

ON

OFF

CHECKING

FUEL

LINES

Hoses

piping

connections
etc

Check
fuel
lines
for

loose
connec

tions
cracks

and
deterioration
Re

tighten
loose

connections
and

replace

any
damaged
or

deformed

parts

REPLACING
AIR

CLEANER
FILTER

Viscous

paper
type
air

cleaner
filter

does

not

require
any
cleaning
opera

tion
until

it
is

replaced
periodically

Sushing
or

blasting
operation
will

cause

clogging
and

result
in

enrich

ment
of
carburetor

mixture
and

should
never
be

conducted

Replace
air

cleaner
filter
in

accord

ance
with
maintenance

schedule

ET
10
CHECKING

AUTOMATIC

TEMPERATURE

CONTROl
AiR

CLEANER

I
Check

that
vacuum
hoses

Intake

manifold
to
3

way
connector
3

way

connector
to

temperature
sensor

3

way
connector
to
idle

compensator

temperature
sensor
to
vacuum
motor

are

securely
connected
in

C9rrect

posi

tion

2

Check
each
hose
for

cracks
or

distortion

3
Check
A
T
C

system
for
function

by
proceeding
as
follows

ConfIrm
that

engine
is
cold
before

starting
test

With

engine
stopp
d

distonnect

fresh
air

duct

Place
a

mirror
at

the
end
of
air

c1eaner
inlet

pipe
as

shown
and
check

to

see
if
air

control

valve
is
in

correct

pOsition

2J

v
7

EF210

Fig
ET
21

Inspecting
Valve
Position

Air

control

va
ve
is
in

correct

posi

tion

if
its

cold
air
inlet
is

open
and
hot

air

inlet
is

closed

4

Start

engine
and

keep
idling

Immediately
after

engine
starting

check
air
control

valve
for
correCt

position
as
described
above
In

this

case
correct

position
of
air

control

valve
is

the
reverse
of

step
3
under

hood
air
inlet
is

closed
and
hot
air

inlet

is

open

5

Check
that
air
control

valve

gradually
opens
to
cold
air
inlet

side
as

engine
warms

up
When
environmental

temperature
around

temperature

sensor
is

low

spend
more
time
for

engine

warning
up
operation
of

facili

tate
smooth

operation
of
air

control

valve

If
the

above

test
reveals

any
prob

lem

in
the

operation
of
air

control

valve

carry
out
the

further

inspection

described
in

Section
EF

Engine
Tune

up

EMISSION
CONTROL
SYSTEM

CHECKING
VACUUM

FITTING
HOSES

AND
CONNECTIONS

Check

fittings
and
hoses
for

ioose

cqnriections
or

damage
Retighten
loose

parts
or

replace
parts
that

are

not

suitable
for
further
use

California
model
FU
model

w

fl11r
o

Intake
manifold

Non
California

model
q

Canada

model

@

T

J
I

M
T

r
T
r
o

p
1
o

1
J

1
Distributor

2
Throttle

opener
vaaJ
um
control
valve

3
From

3
way
connector
to
air
cleaner

4
Throttle
opener
servo

diaphragm

5
Vacuum

switching
valve

6
Thermal
v3roum
valve
7

Vacuum
motor

8
From
vacuum

motor
to

temperature
sensor

9
Carburetor

10
From
idle

compensator
to
intake
manifold

11
To
A
B
valve

12
Vacuum
d

lay
valve
@

@

@

@

@
B
P
T
valve

C
A
C
valve

E

G
R
control
valve

A
B

valve

Carbon
canister
M
T

l

Q2
A
T

ET502

Fig
ET

22
Vacuum
Hoses
and
Connections

ET
11

R
EPIACING
AIR

PUMP
AIR

CLEANER
FILTER

Except
FU
models

and
Canada
models

When

replacing
air
cleaner
filter

remove
ir

cleane

frO
ho

od

legge

and
detach
lower

body
and
filter
as
an

assembly

ET530

Fig
ET
23

Replacing
Air
Cleaner

Filter

REPI
ACINGAIR

INDUCTION
VALVE

FILTER

FU
models

and
Canada
models

Remove

screw

securirtg
valve

to
air

cleaner
Air
induction
valve
fIlter
can

be
taken

out
easily
Replace
fIlter

periodically
in
accordance
with
main

tenance
schedule

2

C

l
11
l

r
r

EC9

Fig
ET

24
R

pklcing
Air
Induction

Value
Filter

REPLACING
P
C
V

VALVEANb
FILTER

I
Check
P

C
V
valve
as
follows

With

engine
running
at
idle
remove

the
ventilator
hose
from
P

C
V

valve

if
the
valve
is

working
a

hissing
noise

will
be
heard
as

air

passes
through
the

valve
and

a

strong
vacuum
should
be

felt

inunediately
when
a

finger
is

placed
over
valve
inlet
Engine
Tune

up

2

Replace
P
C
V
Valve
and
filter
in

accord
with
maintenance

schedul

ET531

Fig
ET
25
Replacing
P
C
V
Value

and
Filter

CHECKING

VENTILATION
HOSES

I
Check
hoses
and
hose
connec

tions
for
leaks

2
Disconnect
all
hoses
and
clean

with

compressed
air

If

any
hose
cannot
be

free
of

obstructions

replace

Confirm

that
flame
arrester
is
locat

ed

correctly
in
hose
between
rocker

cover
and
air
cleaner

ET277

Fig
ET
26

Cleaning
Ventilation
Hose

ET

12
CHECKING
VAPOR

LINES

I
Check
all
hoses
and
fuel
tank

flller

cap

2
Disconnect
vapor
vent
line
con

necting
carbon
canister
to
fuel
tank

3
Connect
3

way
connector
mana

meter
and

cock
or

equivalent
3
w

y

charge
cock
to
end
of
vent
line

ET532

Fig
ET
27
Vent
Line

4

Supply
fresh
air
into

vapor
vent

line

through
cock
little
by
little
until

pressure
become

400

mmH20
is
75

inH20

5
Shut

cock
completely
and
leave
it

unatiended

6
After
2
5
minutes

measure
height

of

liquid
in
manometer

7
Varilllion
in

height
should
remain

with
25

mmHp
0
98

inH20

8
When
filler

cap
does
not
close

completely
height
should

drop
to
zero

ih

a
short
time

9
If

height
does
not

drop
to
zero
in

a
short
time
when
filler

cap
is
re

moved
it
is

cause
of
a

stuffy
hose

Note
In
case
vent
tine
B

stuffy

breathing
in

fuel
tank
is
not

thoroughly
made
thlis

caming
in

sufficient
delivery
of
fuel
to

engine

or

vapor
lock
It
must
tberefore
be

repaired
or

replaced

3

way
connector

ck

Air

Manometer

@

Carbon
canister
Engine
Tune

up

400
mmH20
15
75
in

H20

Check
valve

r
F

uel
filler
cap
with

vacuum
relief
valve

1

Fig
ET
28

Checking
Evaporatiue
Emiuion
Control

System
EC091A

CHECKING
FUEL

TANK
VACUUM

RELIEF
VALVE

Remove
fuel
filler

cap
and
see
it

functions

properly

I

Wipe
clean
valve

housing
and
have

it
in

your
mouth

2

Inhale
air
A

slight
resistance
ac
companied
by
valve

indicates
that

valve
is
in

good
mechanical
condition

Note

also
that

by
further

inhaling
air

the
resistance
should
be

disappeared

with
valve

c
ks

3

If
valve
is

clogged
or
if
no
resist

ance
is
felt

replace
cap
as
an
assem

bled
unit

ET
j3
D

o
0

o
0

o
0

ET500

Fig
ET
29
Fuel
Filler

Cap
with

Vacuum

Relief
Value

REPLACING
CARBON

CANISTER
FILTER

Check
for
a
contaminated
fJlter

Filter
can
be
removed
at
the
bot

tom

of
canister
installed
on
car

body

2

Replace
fJlter
in

accordance
with

maintenance
chedule

EF201

Fig
ET
30

Repfucing
Carbon
Canister

Filter

Engine
Tune

up

Condition
Probable

cause

Low

or
no

current

Ignition
system
out

of

order
Burned
distributor

point

Improper
point

gap

Faulty
condenser

Leak
at
rotor

cap
and
rotor

Faulty
spark
plug

Improper
ignition
timing

Faulty
ignition
coil

Disconnecrion
of

high
tension
cable

Loose
connection

or
disconnection
in

primary
circuit

Lack
offuel

Dirty
fuel

filter

Dirty
or

clogged
fuel

pipe

Fuel

pump
will
not
w0rk

properly

Carburetor
choke
will
not
work

properly

Improper
adjustment
of
float
level

Improper
idling

Dirty
or

clogged
carburetor

Clogged
breather

pipe
of
fuel
tank

Malfunctionin

g
anti

dieseling
solenoid
valve

Malfunctioning
fuel
shut
off
system
FU

models

Incorrect

spark
plug
tightening
or

faulty

gasket

Improper
grade
engine
oil
or
low

viscosity

Incorrect
valve
clearance

Compression
leak
from
valve
seat

Sticky
valve
stem

Weak
or

damaged
valve

springs

Compression
leak
at

cylinder
head

gasket

Sticking
or

damaged
piston
ring

Worn

piston
ring
or

cylinder

Trouble
looting
procedure

Pour
the

engine
oil
from

plug
hole
and
then
measurt

cylinder
compression
Fuel

system
out
of

order

Low

compression

Compression
increases

Compression
does
not

change

ET
17
Corrective
action

Check
for
loose
terminal
or
disconnection
in

primary
circuit

Check
for
burned

points

Repair
or

replace

Adjust

Replace

Clean
or

replace

Clean

adjust
plug

gap
or

replace

Adjust

Replace

Replace

Repair
or

replace

Supply

Replace

Clean

Repair
or

replace

Check
and

adjust

Correct

Adjust

Disassemble
and
clean

Repair
and
clean

Check
for
loose

terminal
or
wire

harness

Check
fuel
shut
off

system
Adjust
or
re

place
if

necessary

Tighten
to

normal

torque
or

replace

gasket

Replace
with

proper
grade
oil

Adjust

Remove

cylinder
head
and

lap
valves

Correct
or

replace
valve
and
valve

guide

Replace
valve

springs

Replace
gasket

Replace
piston
rings

Overhaul

engine

Malfunctiong
cylinder
or
piston
ring

Compression
leaks
from
valve

cylinder
head

or
head

gasket