fuel filter DATSUN 210 1979 User Guide

Condition

ABNORMAL

COMBUSTION

backfire
afterfire

run
on
etc

Improper
ignition
timing

Fuel

system
out
of

order

Feulty
cylinder
heed

etc

Others

EXCESSIVE
OIL

CONSUMPTION

Oilleek8111
Engine
Tune

up

Probable
cause

Surging
A
T
C
air

cleaner
vacuum
motor

Note
This
noise
will
be
hmnl
when
clutch

iI

disengaged

We
r
on
clutch

pilot

bushing

Not
e
This
noise
will
be
heared
when

utch
iI

disengaged

Improper
ignition
timing

Improper
heal

range
of

spark
plugs

Damaged
carburetor
or
manifold

gasket

backfire
aftedire

Clogged
carburetor

jet

Improper
function
of
the
float

Uneven

idling
Run
on

Improperly
adjusted
T
O
C
S
set

pressure

Except
FU

models

Malfunction
of
anti

dieseling
solenoid
valve

Malfunction
of
fuel
shut
off

system
FU

models

Malfunction

or
auto
hoke

Improper
y

adjusted
valve
clearance

Excess
carbon

in
combustion
chamber

Da
laged
alve

spring

backfire
after
he

Malfunction
of
A
T
C
air
cleaner

Inoperative
anti4lackfire
valve

Loose
oil

tain
plUI

ose
or

damaged
oil

pan
gasket

Loose
or

damaled
chain
cover

gasket

Wom
oil
seal
in
front

and
rear
of
crankshaft

Loo
or

damaged
locker

cover

gasket

Improper
lilhtening
of

oU
filter

Loose
or

damaled
oil

pressure
switch

ET
21
Corrective
action

Repair
or

replace

Renew
bush

and

adjust
drive
shaft

Adjust
ignition
liming

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

Check
fuel
shut
off

system

Adjust
or
re

place
necessary

Adjust

Adjust

Remove
head
and

get
rid
of
carbon

Replace
it
wit
a

new
one

Check
for
loose
vacuum
hoses

Replace
if

necessary

Replace

Tighten
it

Renew

lasket
or

tighten
iI

Renew

gasket
or

lighten
it

Renew
oil
seal

Renew

gasket
r

lighten
it
but

not
too

much

Renew

gasket
and

tighten
it
with
the

proper

torque

Renew
oil

pressure
switch
or

tighten
it

Condition

Ex
iv
oil

consumption

Odlen

POOR
FUEL

ECONOMY

See
the
explanation

oI
thtI

power
cIec

01hen

PROBLEM
IN

OTHER

FUNCTIONS

t
1

oil

pre

E
eronthe

lIiding
par1J

Scuffing
oIlliding

par1J
Engine
Tune

up

Probable
cause

Cylinder
and

piston
wear

Improper
lOcation
of

pi5ton
ring

gap
or

reversely
assembled

piston
ring

Damage
pi5ton
r

gs

Wom

pilton
ring
groove
and

ring

Fatigue
of
valve
oil
seal

lip

Worn
valv
stem

Inadequate
qUality
of

engine
oil

Engine
overheat

Exceeding
idling
revolution

Inoperative
acceleration

covel

Fuelleakage

Malfunction
of
T
O
C
S

Except
FU
mod

els

Malfunction
of

A
T
C
air
cleaner

Inadequate
oil

quality

Overheat

Worn
oil

pump
regulator
valve

Functional
deterioration
of

oil

pump

Blocked
oil
filter

Increased
clearanCe
in
various

sliding
parts

Blocked
oil

strainer

Inoperative
oil

gauge
pressure
switch

Oil

pressure
decreases

Improper
quality
or
contamination
of
oil

Damaged
air
cleaner

Overheat

or
overcool

Improper
fuel
nUxture

Decrease
of
oil

presSure

Insufficient
clearances

ET
22
Corrective
action

Overhaul

cylinder
and
renew

piston

Remount

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

Us
the

designated
ou

Previously
mentioned

Adjust
it
to
the

designated
rpm

Adjust
it

Repair
or

lighten
the
connection
of
fuel

pipes

Adjust

Check
and

replace

Use
the

designated
oil

Previously
mentioned

Disassemble
oil

pump
and

repair
or
renew
it

Ref4ir
or

replace
it
with
I
new
one

Renew

i
t

Disassemble
and

replace
the
worn

parts
with

n
w

of
es

Clean
it

Replace
it
with
a
new
one

Previously
mentioned

Exchange
the
oil
with

proper
one
and

change
element

Otange
element

Previously
mentioned

Oteck
the
fuel

system

Previously
mentione
d

Readjust
to
the

designated
clearances

Engine
Tune

up

Condition
Probable

cause

Overheat

Improper
fuel

mixture

Floor

temp
ture
too

high
California
and

FU
model
Problem
in

fuel

system
Refer
to

Inspec

tion
of
Fuel

System

Problem
in

ignition
system

Refer
to
In

spection
oflgnition
System
Corrective
action

Previously
mentioned

Check
the
fuel

system

Check
and

repair

Check
and

repair

SPECIAL
SERVICE
TOOL

Kent
Moore
No

Tool
number
tool

name
Reference

page
or

Fig
No

STl9320000
Oil
filter
wrench

125664

Page
ET
3

ET
23
Kent
Moore

No

Tool
number
tool
name
Reference

page
or

Fig
No

PRELIMINARY

CLEANING
AND

INSPECTION

Before

disassembling
engine
ob

serve
the
following
items

I

Prior
to

disassembling
check

outer

parts
for

sign
of
leak

past
their

gasketed
surfaces

2
Check
carburetor
and
fuel

pump

for
condition
fuel
hoses
for
deteriora

t
ion

cracks
or
otherwise

leakage
of

fuel

past
their

jointed
or

connected

surfaces

3

Wipe
dust
and
mud
off

engine

4

Inspect
outer

parts
for
visual

faults
and
broken
or

missing

parts
such

as
bolts
and

nuts

5
Check

piping
and
electrical
cir

cuits

for
deterioration
breakage

fittings
discontinuity
or
insulation

DISASSEMBLY

To

remove

engine
from
car
refer
to

Section
ER

for
Removal

1
Remove

starting
motor
then
re

move
transmission
from

engine

2
Remove
clutch
assembly

3
Remove

alternator
fan
belt
alter

nator
bracket
and
alternator
adjusting

bar

4
Remove

idler
pulley
air

pump

belt
and
idier

pulley
bracket

If
so

equipped

Note
Loosen
idler

pulley
nut
and

belt

adjusting
bolt
in
that
order

@

1

Idler

pulley
nut

2
Belt

adjusting
bolt

3
Air

pump
belt

4
Idler

pulley
bracket
EM527

Fig
EM
2

Removing
Idle

Pulley

Air

Pump
Belt
and
Idle

Pulley
Bracket
Engine
Mechanical

ENGINE
DISASSEMBLY

5

Remove
air

pump
pulley
air

pump
and
air

pump
bracket
If

so

equipped

6
Remove
fan
fan

spacer
and

pul

ley

7
Remove

oil
level

gauge

8
Remove

distributor

cap
and

high

tension

cables
as
an

assembly

9
Disconnect
distributor
vacuum

line
from
distributor
and
remove
dis

tributor

10
Disconnect

fuel
line
from

carbu

retor

II
Remove
fuel

pump
and
fuel
line

12
Remove
water
outlet
and

thermostat

13
Remove

engine
mounting
brack

et
R
H

14
Remove

oil

pump
and
filter
as

sembly

EL043

Fig
EM

3

Removing
Oil

Pump

15

Remove

spark
plugs

16

Install

Engine
Attachment

KVlOI02500
to

cylinder
block

using

engine

f1
ounling
bracket

R
H
attach

ing
studs
fuel

pump
attaching
studs

and
alternator

bracket

attaching
bolt

holes

17
Mount

engine
on

Engine
Stand

ST050I
SOOO

Fig
EM
4

EM
3
18
Remove

engine
mounting
brack

et

L
H

19
Disconnect

air
vacuum
and

blow

by
hoses
from
air

cleaner

20
Remove
air
cleaner
and
air

cleaner
brackets

21

Remove
vacuum
control
valve

assembly
and
bracket

as
a
unit

22
Remove
carburetor
and
baffle

plate

23

Remove
E
G
R
control
valve

24

Remove
intake
and
exhaust

manifold
assemblies

EM528

Fig
EM
5

Removing
Manifold

25
Remove
P
C
V

hose

pipe
con

nector
to
control
valve

26
Remove

rocker
cover

27
Loosen
valve
rocker

adjusting

nut
and
turn

adjusting
screws
out
to

disengage
push
rods
Then

evenly

loosen
rocker
shaft
bolts

28
Remove
rocker
shaft

assembly

EM453

Fig
EM
6
Removing
Rocker

Shaft

Assembly

29
Withdraw

push
rods
and

keep

them
in

correct
order
1

30
Loosen

cylinder
head
bolts

a

little
at
a
time

in
the

sequence
shown

in

Fig
EM
and
remove

cylinder

head

DATSUN
210
Model
8310
Series

SECTIONEF

ENGINE
FUEL

CONTENTS

AUTOMATIC
TEMPERATURE

CONTROL
A
T
C
AIR
CLEANER

DESCRIPTION

OPERATION

REMOVAL
AND
INSTAllATION

INSPECTION

IDLE
COMPENSATOR

DESCRIPTION

INSPECTION

FUEL
FILTER

DESCRIPTION

FUEL
PUMP

OPERATING
TEST

REMOVAL
AND
INSTAllATION

DISASSEMBLY
EF
2

EF
2

EF
2

EF
3

EF
4

EF
5

EF
5

EF
5

EF
6

EF
6

EF
6

EF
6

EF
7

EF
7
INSPECTION

ASSEMBLY

CARBURETOR

DESCRIPTION

STRUCTURE
AND
OPERATION

INSPECTION
AND
ADJUSTMENT

MAJOR
SERVICE
OPERATION

TROUBLE
DIAGNOSES
AND

CORRECTIONS

SERVICE
DATA
AND

SPECIFICATIONS

GENERAL

SPECIFICATIONS

INSPECTION
AND
ADJUSTMENT

TIGHTENING
TORQUE
EF
7

EF
7

EF
B

EF
B

EF
B

EF
14

EF
23

EF
30

EF
32

EF
32

EF

32

EF
34

TEMPERATURE
SENSOR

Removal

I

Using
pliers
flatten

clip
con

necting
vacuum

hose
to

sensor
vacuum

tube

1

Pipe

2
Catch

3
Fixed
with

adhesive

4
Hose

5
Tab

6

Clip

7
Gasket

EC019

Fig
EF
7

Removing
Seruor

2
Disconnect
hose
from

sensor

3
Take
off

clip
from
sensor
vacuum

tube
and
dismount
sensor

body
from

air
cleaner

Note

The

gasket
between

sensor
and

air

cleaner
is
bonded
to

the
air

cleaner

side
and

should
not

be

removed

Installation

Mount
sensor
on
the

specified

position

2

Insert

clip
into

vacuum
tube
of

sensor
After

installing
each
vacuum

hose

secure
hose
with
the

clip

Note
Be

sure
to
install
vacUl
11n

hose

correctly
Correct

position
is
R
H

side
to

Ntisan

mark
at
the

top

face
of
sensor
for
intake
manifold

L

H
side
for

Deuum
motor

VACUUM

MOTOR

1

Remove

screws

securing
vacuum

motor

to
air
cleaner

2

Disconnect

valve
shaft

attached

to

vacuum
motor

diaphragm
from
air

control
valve

and

remove

vacuum

motor

assembly
from
air

cleaner

3
To
install

reverse
the

removal

procedures
Engine
Fuel

Fig
EF

8
Removing
Vacuum
Motor

INSPECTION

AIR

CLEANER
FILTER

Viscous

paper

type
air

cleaner
filter

does

o
ot

rt

quire
any
cleaning
opera

tion

until
it

is

replaced
periodically

Brushing
or

blasting
operation
will

cause

clogging
and
result

in
enrich

ment

of
carburetor
mixture

and

should
never
be

conducted
For
reo

placement
interval
of
air

cleaner
filter

refer
to

Maintenance

Schedule

AUTOMATIC

TEMPERATURE

CONTROL
SYSTEM

Engine
failures

resulting
from
a

malfunctioning
A
T
C

system
are

manifest

during
cold
weather

opera

tion
Such
failures

include

Engine
stall
or
hesitation

Increase
in
fuel

consumption

Lack
of

power

If
these

phenomena
should

occur

check

A
T
e

system
as

described
in

the

following
before

carrying
out

inspection
of

carburetor

I
Check
that

vacuum
hoses
are

se

l

urely
connected
in
correct

position

2

Check
each
hose

for
cracks
or

distortion

3

Check
A
T

C

system
for

proper

function
as

follo
ys
Confirm
that

engine
is

cold
before

starting
test

With

engine
topped
disconnect

fresh
air

duct
if
so

equipped

Place
a
mirror
at
the
end

of
air

cleaner
inlet

pipe
as
shown
and

check

to
see
if
air
control
valve

is
in
correct

position

EF
4
Fig
EF
9

Inspecting
Valve
Po

man

Air
control
valve
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

S

Check
that
air
control
valve

grad

ually
opens
to

cold
air

inlet
side

as

engine
warms

up
When

environmental

temperature
around

temperature
sen

sor
is
low

spend
more
time

for

engine

warming
up
operation
to
facilitate

smooth

operation
of
air
control

valve

If
the
above

test
reveals

any
prob

lem
in
the

opera
ion
of
air
control

valve

carry
out
the

following
test

VACUUM
MOTOR

I
With

engine
stopped
confirm

that

cold
air
inlet
is

open
and

hot
air

inlet
is

c1
Sed

If
not

check
air
control
valve
link

age
for

proper
operation

2

DiscoJln
ct
ac
um

motor
inlet

vacuum
hose

and
connect

another

hose
to
the

inlet
to

apply
vacuum
to

vacuum
motor

Vacuum
can

be

appli
d

by
breathing
in

tile
hos
e
end

as

shown
Then

confirm
that

the
air

control
valve

moves

3
With
hot
air
inlet
in

open
posi

tion
as

described
in

step
2

above

pinch
vacuum
hose
with

fingers
and

cut
off
air
from

vacuum
hose
In

this

condition

check
that
air
control

valve

maintains
the

condition
described
in

step
2

for
more
than

30
seconds

and

that
hot

air
inlet

is

open
If

diaphragm

spring
actuates

the
air
control
valve

by

Engine
Fuel

S
Idle

compensator
is
ill

good
order

if
a

hissing
sound
is

heard
when
its

temperature
reaches

operating
tern

perature

If
not

replace
idle

compensator
ldlerompensator
l
b
l

r
I

No
1
60
to
700C

140
to
15

Of

No
2
70

to
800C

158
to
1760F

FUEL
FILTER

DESCRIPTION

t
t

I

J
i

l
The
fuel
filter
is
a

cartridge
type
It

useS
a

paper
element

1
Body

2

Paper
element

3
Cover
EFOOS

Fig
EF

14
Sectional
View
of
Cartridge

Type
FuelFilte

FUEL
PUMP

t

j
f

EC132

Fig
EF
15
Schematic
View

of
Fuel

Pump

EF
6
OPERATING
TEST

Note
When

disconnecting
fuel
hoses

me
a

container
to
receive
fuel

remaining
in
fuel
hoses

STATIC
PRESSURE
TEST

The
static

pressure
test
should
be

conducted

as
follows

I
Disconnect
fuel
hose

between
car

buretor
and
fuel

pump

2
Connect
a
rubber
hose
to
each

open
end
of
aT
connector
and
con

nect
this
connector
hose

assembly
be

tween
carburetor
and
fuel

pump

Note
Locate
this
T
eonnector

as

close
to
carburetor
as

possible

3

Connect
a
suitable

pressure
gauge

to

the

opening
of

T
connector
and

fasten
the
hose
between
carburetor

and
T

connector

secUrely
with
a

clip

4
Start
and
run
the

engine
at

various

speeds

I

Secondary
slow
air

bleed

2

Secondary
main
air
bleed

3

Secondary
main
nozzle

4

Primary
main
nozzle

5

Primary
main

air
bleed

6

Primary
slow
air
bleed

7

Primary
slow

jet

8

Primary
main

jet

9
Idle
nozzle

10
Primary
throttle
valve

II

Auxiliary
valve

12
Seco
dary
throttle
valve

13

Secondary
main

jet

14

Counterweight

IS

Secondary
slow

jet

EF419A

Fig
EF
24
At
Full

Open
High
Speed
Engine
Fuel

Secondary
slow

system

Step
system

The
construction
of
this

system

corresponds
to

the

idling
and
slow

system
of
the

primary
system

This

system
aims

at
the

power

filling
up
of
the

gap
when

fuel

supply

is
transferred
from

the

primary
system

to
the

secondary
system
The

stepport

is
located

near
the

auxiliary
valve
in
its

fully
closed
state

ANTI

DIESELING
SYSTEM

The

carburetor
is

equipped
with
an

anti
liese1i

lg
solenoid

valye

As
the

ignition
switch
is

turned
off

the
valve
is

brought
into

operation

shutting
off
the

supply
of

fuel
to

the

slow
circuit

The

following
figure
shows
a
see

tional
view

of
this

control

An

ti
dies

eling
solenoid
valve

Ignition
switch
OFF

ON

t

L
li

FLOAT
SYSTEM

There
is

only
one
float
chamber

while
two
carburetor

systems

primary

and

secondary
are

provided

Fuel
fed
from
the
fuel

pump
flows

through
the
filter
and
needle
valve
into

the
float

chamber
A
constant
fuel

level
is
maintained

by
the

float
and

needle
valve

Because
of

the
inner
air

vent

type

float

chamber
ventilation
fuel
con

sumption
is

not
affected

by
dirt
ac

cumulated
in

the
air
cleaner
Ignition
switch

Q

1

T
Battery

niT

EC
3

Fig
EF
25

Anti
dieseling
Solenoid
Valve

The
needle
valve
includes

special

hard

steel
ball
and
wiD

not
wear
for
all

its

considerably

long
use

Besides
the
insertion
of

a

spring

will

prevent
the

flooding
at

rough
road

running

THROTTLE
OPENER

CONTROL
SYSTEM

T
O
C
S

Except
FU

model

The
function

of
the
throttle

opener

is
to

open
the

throttle
valve
of
the

carburetor

slightly
while
the
car
is
in

EF
10
deceleration

During
deceleration

the

manifold
vacuum
rises
and

the

quan

tity
of
mixture
in
the

engine
is

not

suffICient
for
normal

combustion
to

continue

4
consequently
a

great

amount
of

unburned
HC
is
emitted

Carburetors

equipped
with

the

throttle

opener
supply
the

engine
with

an

adequate
charge
of

combustible

mixture
to
maintain

proper
combus

tion

during
deceleration

resulting
in
a

dramatic
reduction
in
HC

emission

The

system
for
the

manual
trans

mission
model
consists
of

servo
dia

phragm
vlicuum

control
valve
throttle

opener
solenoid
valve

spee
l

detecting

switch
and

amplifier
On

the
auto

matic

transmission
model
an
inhibitor

and
inhibitor

relay
are
used
in

place
of

speed

detecting
switch
and

amplifier

on
the
manual
transmission

model
An

altitude

corrector
fitted
to
vacuum

control
valve

serves
to

automatically

regulate
the

operating
pressure
in

the

system
with

variation
of

atmospheric

pressure

T
o
C
S
n

operatIon

At
the

moment

when
the

manifold

vacuum
increases
as

occurs

upon
de

celeration

the
vacuum

control
valve

opens
to
transfer

the
manifold

vacuum

to
the
servo

diaphragm
chamber
and

the
throttle
valve
of
the

carburetor

opens

slightly

Under
this

condition
a

proper

amount

of
fresh
air

is
sucked

into
the

combustion
chamber
As
the
result

complete
combustion
of
fuel
is

as

sisted

by
this
additional
air

and
the

amount

of
H
C

contained
in

exhaust

gases
is

dramatically
reduced

Throttle

Clpener
sol
nold

valve

operation

Manual

transmission
models

The
throttle

opener
solenoid
valve

is
controlled

by
a

speed

detecting

switch
which
is

actuated

by
the

speed

ometer
needle

As
the

car

sp
ed
falls
below
16

km
h
10
MPH

this
switch
is
acti

vated

producing
a

signal

The

signal
is

led
to
the

amplifier
so

that
the

signal
can
be

amplified
to

a

degree

large
enough
to
actuate
the

CLEANING
AND
INSPECTION

Dirt

gum
water
or
carbon
con

tamination
in
or
on
exterior

moving

parts
of
a
carburetor
are
often

respon

sible
for

unsatisfactory
performance

For
this

reason
efficient
carhuretion

depends
upon
careful
cleaning
and

inspection
while

servicing

Blow
all

passages
and

castings

with

compressed
air
and
blow
off
all

parts
until

dry

Note
Do
not

pass
drills
or
wires

through
calibrated

jets
or

passages

as
this

may

enlarge
orifice
and

seriously
affect
carburetor
calibra

tion

2
Check
all

parts
for
wear
If
wear

is
noted

damaged
parts
must
be
re

placed
Note

especially
the

following

I
Check
float
needle
and
seat
for

wear
If
wear
is

noted
assembly
must

be

replaced

2
Check
throttle
and
choke
shaft

bores
in
throttle
chamber
and
choke

chamber
for
wear
or
out
of
roundness

3

Inspect
idle

adjusting
needle
for

hurrs
or

ridges
Such
a
condition
re

quires
replacement
Engine
Fuel

3

Inspect
gaskets
to
see
if

they

appear
hard
or

brittle
or
if

edges
are

torn
or

distorted
If

any
such

condi

tion
is
noted

they
must
be

replaced

4

Check

filter
screen

for
dirt
or
lint

Clean

and
if
screen
is

distorted
or

remains

plugged
replace

5

Check

linkage
for

operating

condition

6

Inspect
operation
of

accelerating

pump
Pour
fuel
into
float
chamber

and
make
throttle
lever

operate
Check

condition
of
fuel

injection
from
the

accelerating
nome

7
Push

connecting
rod
of
dia

phragm
chamber
and

block

passage
of

vacuum
with
finger
When

connecting

rod
becomes
free
check
for
leakage
of

air
or

damage
to
diaphragm

Jets

Carburetor
performance
depend

on

jets
and
air
bleeds
That
is

why

these

components
must
be
fabricated

with
utmost
care
To

clean
them
use

cleaning
solvent
and

blow
air

on
them

Larger
inner
nwnbers

stamped
on
the

EF

29
jets
indicate

larger
diameters
Ac

cordingIy
main
and
slow

jets
with

larger
numbers

provide
richer
mixture

the
smaller
numbers
the
leaner
mix

ture

Conversely
the
main

and
slow
air

bleeds

through
which
air

to

passes

make
the
fuel

leaner
if

they
bear

larger

numbers
the
smaller

numbers
the

richer
fuel

Assembly

To
assemble
reverse

the
disassem

bly

procedure
taking
care
to
the

following

I
Thoroughly
wash
all
the

parts

before

assembling

2

Inspect
gaskets
to

see
if

they

appear
hard
or
brittle
or
if

edges
are

torn
or
distorted

If

any
of
such
undesirable
condi

tions
is

noted

they
must
be

replaced

3
Install

jet
and
air

bleed

having
the

Same
size

number
as
that
of

original

one

4

After
reassembling
carburetor

check
each

rotating
portion
or

sliding

portion
for
smooth

operation

Engine

fuel

TROUBLE

DIAGNOSES
AND

CORRECTIONS

In
the

following
table
the

symp

toms
and
causes
of
carburetor
troubles
and
remedies
for
them
are
listed
to

facilitate

quick
repairs

There
are
various

causes
of

engine

malfunctions

It
sometimes

happens

that
a

carburetor
which
has
no
fault

appears
to
have

some

problems
when

Condition
Probable

cause

Overflow

Dirt
accumulated
on
needle
valve

Fuel

pump
pressure
too

high

Needle
valve

improperly
seated

Excessive
fuel

consumption
Fuel
overflow

Slow

jet
too

large
on
each
main

jet

Main
air

bleed

clogged

Choke
valve
does

not

open
fully

Outlet

valve
seat
of

accelerator

pump

improper

Unked

opening
of

secondary
throttle
valve

opens
ioo

early

Power

shortage
Mainjels
clogged

Every
throttle
valve
Joes

not

open

fully

Idling
adjustment
incorrect

Fuel
filter

clo
ll
ed

Vacuum

jet
clogged

Air
cleaner

clogged

Diaphragm
damaged

Power
valve

operating
improperly

Improper
idling
Slow

jet

clogged

Every
throttle
valve

does
not
close

Secondary
throttle
valve

operating
im

properly

Throttle
valve
shafts
wom

Packing
between

manifold
carburetor

faulty

Manifold
carburetor

tightening

improper

Fuel
overflow

T

O
C
S

adjustment
incorrect

Vacuum
control
solenoid

damaged

Stuck
dash

pot

EF
30
acfuaJIy
theelectric

syslem
i
at
fatilt

Therefore

whenever
the

engine
is
mal

functioning
the

electrical

system

should
be
checked

fust
before

adjust

ing
carburetor

Corrective

action

Clean
needle
valve

Repair
pump

Replace

See
above

item

Replace

Clean

Adjust

Lap

Adjust

Clean

Adjust

Repair

Repair

Clean

Clean

Replace

Adjust

Clean

Adjust

Overhaul

and
clean

Replace

Replace

packing

Correct

tightening

See
the
first

item

Adjust

Replace

Replace