fuel DATSUN 210 1979 Owner's Manual

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

29

Apply
engine
oiho
both
ends

of

push
rods
and
insert
in

proper
se

quence

30

Apply

engine
oil
to

valve
stem

end
and

rocker
arm
contact

surfaces

Position
rocker
shaft

assembly
on

cyI

inder
head

31

Tighten
rocker
shaft
bracket

bolts
to

specified
torque

fJ

Tightening
torque

Rocker
shaft
bracket
bolts

2
0
to
2
5

kg
m

14
to
18
ft

b

Note

Tightening
should
be
done

in

two
or
three

stages
outwardly
from

center
bracket

EM506

Fig
EM

77
Rocker

Shaft
Bolt

Tightening
Sequence

32

Adjust
valve

clearance
to

speci

fied
value

Note

a
First

set
clearance
to
0

25

mm

0
0098

in
when

engine
iscold

b
After

engine
has
been
assembled

warm
it

up
for
at
least
several

minutes

finally

adjust
clearance
to

specification
For
details
refer
to

Adjusting
Intake
and
Exhaust
Valve

Clearance
in
ET

Section

EM507
or

Wrench

2
Screwdriver

3
Feeler

gauge

Fig
EM
78

Adjusting
Value

Clearance
Engine
Mechanical

Valve

clearance

Intake
and

exhaust

hot

0
35
mm
0
014
in

cold

0

25
mm
0
010
in

fJ

Tightening
torque

Velve
rocker

adjusti
g
nut

1
6
to
2
2

kltm

12
to
16
ft
b

33

Install
rocker

cover

34

Install
intake
and

exhaust
mani

folds

fJ

Tightening
torque

Manifold
nuts

1
5
to
2
0

kg
m

11
to
14

fHb

Note

When

installing
intake
and
ex

haust

manifolds
locate
bolt

in

center
of

fitting
hole

EM528

Fig
EM
79

Installing
Manifolds

35
Install
E
G
R
control

valve

36

Install
baffle

plate
and

carbure

tor

fJ
Tightening

torque

Carburetor
nuts

0
4

to
0
6

kg
m

2
9
to
4
3
ft

Ibl

37
Install
vacuum

control
valve
as

sembly
and
bracket

38
Install

air
cleaner

bracket
and
air

cleaner

39

Connect
air

vacuum
and

blow

by
hoses
to
air

cleaner

40
Install

pipe
connector
to
control

valve
hose
and

engine

mounting
brack

etLR

41

Install

distributor

EM

16
CAUTION

a
8e
sure
to
set
No
1

piston
to

LD
C
of

compression
stroke

b
Before

instaliation
return
distribu

tor
rotor

approximately
30

degrees

from
its
correct

position
Insert

distributor

meshing
distributor

drive

gear
and
driven

gear

c
After
installation
distributor
rotor

should

align
with

mark
on
rotor

cap

J

No
1

mark

EM508

Fig
EM

80
Cornct
P05ition

of

Rotor

42

Dismount

engine
from

Engine

Stand

ST0501S000
and

place
it

on

suitable

engine
stand

Re

move

Engine
Attachment

KVlOI
2500

43

Install

spark
plugs
and

engine

mounting
bracket
R
H

44

Install
oil

pump
and
ftIter

assem

bly

45
Install
thermostat

and
water

outlet

46
Install
fuel

pump
and
fuel

lines

Do
not

forget
to

install

spacer
and

gasket

47

Install
distributor
vacuum
line

48
Install
distributor

cap
and

high

tension

cables
as
an

assembly
Connect

high
tension

cables

49
Insert

oil
level

gauge

50

Install
fan
fan

pulley
and
fan

spacer

Lock
bolt

by
bending
lock

washers

51

Install
alternator
bracket

adjust

ing
bar
water

pump

pulley
alternator

t
IGHTENING

TORQUE

Cylinder
head
bolt

Rocker
shaft
bracket
bolt

ain

bearing
cap
bolt

Flywheel
fixing
bolt

Drive

plate
fixing
bolt
Al4

AlS

Connecting
rod

cap
nut

Camshaft

sprocket
bolt

Locating
plate
bolt

Valve
rocker

adjusting
nut

Oil
strainer
bolt

Oil

pan
bolt

Oil

pan
drain

plug

Timing
chain

cover
bolt

Crank

pulley
bolt

Water

pump
bolt

Fuel

pump
bolt

Spark
plug

Engine
mounting
securing
bolt
Engine
Mechanical

Unit

kg
iii

ft
lb

7

0
to

7
5
51

to
54

2
0t02
5

14to
18

5

0
to

6
0
36

to
43

8

0
to
9
0
58
to

65

8
0
to
9
0

58
to

65

8
5
to
9
5
61
to
69

3
2
to
3

8
23
to

27

4
0

to
4
8

29
to

35

0

5
to

0
8

3
6
to
5
8

1
6
to
2
2
12to

16

0
9
to
I
4

6
5
to

10
1

0
4

to
0

6
2

9
to
4
3

2

0
to
3

0
14
to
22

0
5
to
0
7
3

6
to
5
1

15to
20

l08
to
145

0
9
to
I
4

6
5
to

1O
l

0
9
to
I
4
6
5
to

10
1

1
5
to
2

0
11

to
14

1
9
to
2
5
14to

18

EM
30

Condition

Waterpurnp

knocking

II
Othw

mllChani

troubl

Stuck

valve

Seized
valve

seat

Excessively
wom

cylinder
and

piston
Engine
Mechanical

Probab
Ie
cause

Improper
shaft
end

play

Broken

impeller

Improper
valve
clearance

Insufficient
clearance
between
valve
stem
and

guide

Weakened
or
broken
valve

pring

Biting
or

damage
of
valve
stem

Poor
fuel

quality

Il1
prop
r
valve
clearance

Weakened
valve

pring

Thin
valve
head

edge

Narrow
valve

seat

Overheating

Over

speeding

Sticked
valve

guide

Shortage

ofengine
oil

Dirty
engine
oil

Poor
oil

quality

Overheat

Wrong
assembly
of

piston
with

connecting
rod

Improper
piston
ring
clearance

Dirty
air
cleaner

Too
rich
mixture

Engine
over
run

Stuck
choke
valve

Over

choking

EM
32
Corrective

action

Replace

Replace

Adjust

Clean
stem
or
ream
the

guide

Replace

Repil
ce
or
clean

Use

good
fuel

Adjust

Replace

Replace
valve

Reface

Repair
or

replace

Drive
at

proper
speed

Repair

Add
or

replace
oil

Check
oil
level
on

daily
basis

Clean
crankcase

replace
oil
and
re

place
oil
ftIter
element

Use

proper
oil

Repair
or

replace

Repair
or

replace

Adjust

Clean

periodically

Adju
t

Drive

correctly

Clean
and

adjust

Start
in
correct

way

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

Engine
Fuel

AUTOMATIC
TEMPERATURE
COtirROL
A
T

C

AIR
CLEANER

DESCRIPTION

U

S
A

mode
18

ExC
FU

model

I

C1J
Cana
ia
and
FU

models

I
Air

relief
valve
Non

alifornia

models

2

Air
hole
for
T
C

S

3
P

C
V

mter

4
Air

hole
for
A
B

valve
5
Idle

compensator

6
Outlet
for
C
A

C
valve

California
model

7

Temperature
seIl50r

8

Heat
control
valVe

EF415A

Fig
EF
l
A
T
C

Air
Cleaner
U
S
A
model

except
FU
model
8
3

1

Air
hole

for
T

C
S

2

Air
induction
valve
and

ftIter

3
P

C
V

mtet
Air

hole
for
A
B

valve

Idle

compen
ator

Temperature
sensor

Heat
control
valve

EF041A

Fig
EF
2
A
T
C
Air
Cleaner
Canado
ond
FUmodel

The

automatic

temperature
control
system
of

the
air

cleaner
is

control
ed

by
the
inlet
air

temperature
and
the

load
condition
of
the

engine
The
inlet
air

temperature
is
detected

by
th

sensor
and
the

vacuum
motor
is

actu

ated

by
the

engine
intake
vacuum
OPERATION

Engine
Under
hood
air

temperature
Sensor
vacuum
at

vacuum
motor

side
Air

con
trol
valve

operation
Sensor

operation

Below
380e

IOO
F
Below
40

mmHg

1
57

inHg
Open
cold
air

AI4
A15
Above
160

mmHg

6
30

inHg
Closed

Closed
hot

air

38
to

S40C

100

to
l290F
Partially
open

cold
air
hot
air
Partially
open

Above
550e

1310F
Open
cold
air

Open

HOT
AIR

OPERATION

When

the

engine
intake
air

tempera

ture
is

low
the

sensor
air
bleed
valve

remains
in

the
closed

position
and

establishes
vacuum

passage
betw

n
the
intake
manifold
and

vacuum

motor
With

this
condition
the
vacu

um
at

the
intake
manifold
side

actuates
the
air

control
valve
attached
to
the

vacuum
motor

diaphragm
to

introduce
hot
air
into
the
air
cleaner

through
the
hot
air

duct
on
the
ex

haust
manifold

EF
2

Hot

air
Engine
Fuel

To
manifold
I
Air
inlet

pipe

2
Air

con
trol

valve

3
Hot
air

pipe

4

Diaphragm

5
V

Bellum
hose

6

Diaphragm
spring

7
Air

bleed
valve

closed

8

Temperature
sensor

assembly

Fig
EF
3

Hot
Air

Delivery
Mode
During
cold

engine
operation
EC007

COLD
AIR
OPERATION

1
When

the
vacuum
is
small
or

when
the

engine
is

operating
under

heavy
load
the

air
control
valve

opens

widely
irrespective
of
the

temperature

around
the
sensor
to
introduce
the

cold
air
for
increased

power
of
the

engine

2
When
the

engine
intake
air
tem

Cold
air

I
L
CD

mf

LlF

JII

1
perature
is

high

The
s
ns
r
air
bleed
valve

opens

fully
to
break
the
vacuum

passage

between
the
intake
manifold
and
the

vacuum

motor
Due
to
the
force
of
the

vacuum
motor

diaphragm
spring
tne

air
control
valve
closes
the
hot
air

pipe

of
the

air
cleaner
and
introduces
the

cold
air
See

Fig
EF
4

I

manifold
I
Air
nlet

pipe

2
Air
control
valve

3
Hot
air

pfpc

4

Diaphragm

5
Vacuum
hoses

6

Diaphragm
spring

7
Air
bleed
alve

fully
open

8

Temperature

assembly

EF715

Fig
EF
4
Cold
Air

Deliuery
Mode

During
hot

engine
operation

TEMPERATURE
SENSOR

The

temperature
sensor
is
attached

to

the
inside
of
the
air
cleaner
The

bi
metal
built
in
the

sensor
detects
the
engine
intake
air

temperature
and

opens
or

closes
the
vacuum

passage
in

the

sensor

I
Protector
cover

2

Screw

3

Adjusting
frame

4
Air

temperature
bi
metal

5
Rivet

6
Valve

seat
frame

7

Lower
frame

8
Air
bleed
valve

9
Gasket

EF206

Fig
EF

5
Temperature
Sensor

EF
3
VACUUM
MOTOR
AND

AIR
CONTROL
VALVE

The

vacuum
signal
from
the

tem

perature
sensor
acts

upon
the
vacuum

motor

diaphragm
The
valve

shaft
at

tached
to
the

diaphragm
is
then
moved

up
or
down

in

response
to
the
vacuum

on
the

diaphragm
This
movement
of

the
valve

shaft
actuates
the
air

control

valve
to
control
the

temperature
of
the

air
to
be
introduced
into
the

air

cleaner

@

@

@
I
Valve

spring

2

Diaphragm

3

Retainer

4
Valve
shaft

EF207

Fig
EF

6
Vacuum
Motor

REMOVAL
AND

INSTALLATION

AIR
CLEANER

I
Loosen
bolts

securing
air
cleaner

to
air
cleaner
bracket

2
Loosen
air
cleaner

lock
bolt
and

remove
air
cleaner
from
carburetor

Disconnect
the

following
hoses
when

dismounting
air
cleaner

I

Fresh
air
duct

2

Hot
air
duct

3
Vacuum
hose
Sensor
and

idle
com

pensator
to
intake

manifold

4
Hose
Air

pump
relief

valve
Non

California
models

except
Canada

5
Air

induction
hose
Canada
and

FU
models

6
Hose
A
B
valve
to

air
cleaner

7
Hose
Air
cleaner
to
throttle

opener

or
vacuum
switch

8
Blow

by
hose
Air

cleaner
to
rocker

cover

3
To
install

reverse
the
removal

procedure

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