check engine DATSUN 210 1979 Workshop Manual

1

Servo

diaphragm
4

Stopper

2
Bracket
5
Link

3
Lock
nut
6
Carburetor

EF732

Fig
EF
56

Adjusting
Seroo

Diaphragm

Adjwting
Screw

FUEL

SHUT
OFF

SYSTEM

Precautions

a

Before

checking
make
sure

engine

is

warmed

up
and
choke
wive
is

fully
open

b

On
air
conditioner

equipped
mod

els
turn
off

air
conditioner
switch

in

steps
I

through
12

c

Keep
clutch

pedal
held
down
with

your
foot
while

depressing
accele

g

f
J

1
Engine
Fuel

rator

pedllI
when
shift
leVer
ISm

any
position
other
than

neutral

Otherwise
car
will

surge
forward

abruptly

Note
Do

not
attach
test
leads
of
a

circuit
tester
to
terminals
other

than
those

designated

Run

engine
at

idling

speed

2
Disconnect

anti
dieseling
solenoid

valve
connector
and
make

sure
that

engine

stops
If

not

replace
anti

dieseling
solenoid
valve

assembly

EF856

Fig
EF

57

Checking
Function

of

Anti
die

eling
Solenoid
Valve

31
A

t

CID

@

V

II
l

To

distributor

T
n

l1on
coon
o

1

Ignition
switch

2
Fuse

3

Anti
dieseling
solenoid

4

Neu
tral

detecting
switch
5
Throttle
valve
swltch

6

Engine
revolution
switch

7

Transistor

ignition
unit

8
Function
test
connector

Fig
EF
58

Checking
Fuel
Shut
off

System
Operation
with
Function

Test
Connector
EF436A

EF
22
3
Conilect
anti

ieselingsolenoid

valve
connector

4
Restart

engine

5
Connect

circuit
tester

as
shown
in

Fig
EF
S8

6

Depress
clutch

pedal
and

shift

gears
into
5th

position

7

Depressing
clutch

pedal
increase

engine
speed
to

about
3

000

rpm
by

depressing
accelerator

pedal
Then

quickly
close
throttle
wIve

by
re

leasing
accelerator

pedal

8
At
this
time
check

for

presence

of

voltage
across
A

and
B

I
If

voltmeter

reading
i
ero
dur

ing
acceleration
and
is
12V

during

deceleration
fuel
shut
off

system
is

functioning

2
If

voltmeter

reading
is

zero
or

l2V
in

both

engine
operations
fuel

shut
off

system
is

malfunctioning

In

any
case
continue
with
the

following
items

9

Shift
lever
to
neutral

then
in

crease

engine
speed
and

quickly
close

throttle
valve

If

voltmeter

reading
is

zero
in
both

engine
operations
and
results
of
test

i
tern

8
are
correct
neutral

detecting

switch
is

functioning
properly
If
not

check
neutral

detecting
switch
harness

and
connections

Replace
if

necessary

10
Turn

off

ignition
switch

II

Disconnect
throttle
valve
switch

connector
and
connect

circuit
tester

to
throttle
valve
switch
connector

12

Run

engine
under

no
load
In

crease

engine

speed
slowly
and
make

sure

engine
speed
is
within
the

speci

fied

range
when
throttle
valve
switch
is

turned
on

Then

decrease

engine
speed
slowly

and
make
sure

engine
speed
is
within

the

specified
range
when
throttle
valve

switch
is
turned

off

If
not

adjust
throttle
valve

switch

13
In
air

conditioner

equipped

models

proceed
as
follows

I
Check
F
l
C
D

rpm
and
correct

if

necessary

2
With

air
conditioner
in
ON

F
l
C
D
is
actuated
increase

engine

speed
slowly
then
decrease
it
And

make

sure
throttle
valve

operates

Click
sOund
is
heard
or

continuity

turns
to
OFF
when

engine
speed

decreases
to

idling

If
not

adjust
throttle
valve
switch

Fig
EF

59

Adjusting
Throttle

Valve
Switch
Eng
ine
Fuel

If
throttle
valve
switch
cannot
be

adjusted
to

specification
replace

Engine
operation
Throttle
valve
switch

continuity
Engine
speed

rpm

When

engine
speed

increases
OFF
ON
1
150

t200

When

engine
speed

decreases
ON

OFF
I
000
t
200

Inspecting
engine
revolution

switch

Note
Before

checking
the

engine

revolution
switch

make
sure

the

functions
of
other

components
are

correct
in
accordance

with
the

items

described
above

Disconnect
throttle
valve

switch

connector
2
Connect
circuit
tester

3
Run

engine
at

idling
speed

4

Depress
clutch

pedal
and
shift

gear
into
5th

position

5

Depressing
clutch

pedal
increase

engine
speed
slowly
Make

sure

engine

speed
is
within
the

specified
range

when
voltmeter

goes
from
OV
to
l2V

Then
decrease

engine

speed
slowly

and
make

sure

engine
speed
is
within

the

specified
range
when
voltmeter

goes
from
12V

to
OV

EF
23
MAJOR
SERVICE

OPERATION

The

perfectly
adjusted
carburetor

deliver
the

proper
fuel
and
air
ratios

at
aD

speeds
for
the

particular
engine

for
which
it

was

designed
By
com

pletely
disassembling
at
re
ular
inter

vals
which
will
allow

cleaning
of
all

parts
and

passages
the
carburetor
can

be
maintained
in
its

original
condition

and
will

continue
to
deliver
the

proper

ratios

To
maintain
accurate
carburetion

of

passages
and

discharge
holes
ex

treme
care
must
be
taken
in

cleaning

Use

only
carburetor
solvent
and

compressed
air

to
clean
all

passages

and

discharge
holes
Never

use
wire

or

other

pointed
instrument
to
clean
or

carburetor
calibration
will
be
affected

REMOVAL

Remove
carburetor
from

engine

taking
sufficient

care
to
the

following

Precautions

a
When

disconnecting
fuel
lines
do

not

spill
fuel
from
fuel

pipe

b
When

removing
carburetor

do
not

drop

any
nut

or
bolt
into

intake

manifold

c
Be

careful
not
to
bend
or
scr
tch

any

part

d
Link

system
of
carburetor
differ

between
models
for
U
S
A

and

Canada
For
details
see

Figure
EF

60
which
is
based
on
Canadian

models

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

Condition

Engine
hesitation

Engine
does
not

start
Engine
Fuel

Probable

cause

Main

jet
or
low

jet
clogged

By
pass
hole
idle

passage
clogged

Emulsion
tube

clogged

Incorrect

idling

adjustment

Secondary
throttle
valve

operating
improp

erly

Fuel
overflows

No
fuel

Idling
adjustment
incorrect

Fast
idle

adjustment
incorrect

Damaged
anti
dieseling
solenoid

EF
31
Corrective
action

Clean

Clean
tube

Clean

Correct

adjustment

Overhaul
and

clean

See
the
first

item

Check

pump
fuel

pipe
and
needle
valve

Adjust

Adju
t

Replace

Emission
Control

System

CRANKCASE
EMISSION
CONTROL
SYSTEM

DESCRIPTION

This

system
returns
blow
by

gas
to

both
the

intake
manifold
and
carbure

tor
aitdeaner

The

positive
crankcase
ventilation

P

C
v
valve
is

provided
to

conduct

crankcase
blow

by
gas
to
the
intake

manifold

During
partial
throttle

operation
of

the

engine
the
intake
manifold
sucks

the
blow

by
gas
through
the
P

C
V

valve

Normally
the

capacity
of
the

valve

is

sufficient
to
handle

any
blow

by
and

a

small
amount
of

ventilating
air

L

J

J

o

I

Fresh

air

Blow

by
gas
The

ventilating
air
is

then
drawn

from

the
dust
side
of
the
carburetor

air

cleaner

through
the
tube
connect

ing
carburetor
air

cle
er
to
rocker

cover
into
the
crankcase

Under
full
throttle
condition
the

manifold
vacuum
is

insufficient
to

draw
the

blow
by
flow

through
the

valve
and
its

flow

goes

through
the

tube
connection
in
the

reverse
direc

tion

On
cars
with
an

excessively
high

blow
by
some
of
the
flow
will

go

through
the
tube
connection

to
car

buretor
air

cleaner
under
all
condi

tions

r

IiI
e
1

LJ

1

Seal

type
oil
level

gauge

2
DafOe

plate

3

Flame
arrester

4
Filter

5

P
C
V
valve

6
Steel
net

1
Baffle

plate

EC871

Fig
EC
5
Crankcase
Emis
ion
Control

Sy
tem

EC
6
INSPECTION

p
C
V
VALVE
AND
FILTER

With

ei
gine

runnirig
at
idle
remove

the
ventilator
hose
from
P

C
V

valve

if
the
valve
is

working
a
hissing
noise

wiD
be
heard

as
air

passes
through
the

valve
and
a

strong
vacuum
should
be

felt

irnniediately
when
a

fmger
is

placed
over
valve
inlet

EC139A

Fig
EC
6

Checking
PC

V
Vo
ve

VENTILATION

HOSE

I
Check
hoses

and
hose
connec

tions
for
ieaks

2
oisconn
ct
all
hoses
and

clean

with

compressed
air

If

any
hose

cannot
be

free
of

obstructions

replace

Ensure
that
flame

arrester
is

surly

inserted
in

hose
between

air
cleaner

and
rocker
rover

ET277

Fig
EC

7

Checking
Ventilation
Hose

Remove

snap
ring
CD
and
lock
bolt

@
and
the

following

parts
can
be

detached
from
heat

control
valve

shaft

Key

ID

Counterweight

@

Thermostat

spring

@

Coil

spring

@

Note
As

previously
descnbed

heat

control

valve

j
is

welded

to
valve

shaft

@
at

exhaust
manifold

and

cannot
be
disassembled

To
install

reverse
the
removal

procedure

INSPECTION

1
With

engine
stopped
visually

check
the

quick
heat
manifold

system

for
the

following
items

I
Check
heat
control
valve
for

malfunction
due

to
break
of

key
that

locates

counterweight
to
valve
shaft

2
Rotate
heat
control
valve
shaft

with

fingers
and
check
for

binding

between
shaft
and

bushing
in

closing

and

opening
operation
of

heat
control

valve
If

any
binding
is
felt
in

rotating

operation
move
valve
shaft
in
the

rotation

direction
several
times
If
this

operation
does
not
correct

binding

condition
it
is

due
to
seizure
between

shaft
and

bushing
and
exhaust
mani

fold
should

be

replaced
as
an

assem

bly
Emission
Control

System

Counterweight

Heat
control
valve

Stopper
pin

EC249

Fig
EC
IO

Checking
Heat
Control

Valve
Movement

2
Run

engine
and

visually
check

counterweight
to
see
if
it

operates

properly

I
When

engine
speed
is
increased

discharge

pressure
of

exhaust

gases

causes

counterweight
to

move

down

ward

clockwise

2
For

some
time

after

starting

engine
in

cold
weather

counterweight

turns
counterclockwise
until
it

comes

into

contact
with

stopper
pin
installed

to

exhaust
manifold

EC
9
Counterweight
gradually
moves

down

clockwise
as

engine
warms

up

and
ambient

temperature
goes
higher

around
exhaust
manifold

If
it
does
not
move
at
all
check

and

replace
thermostat

spring

AIR

INJECTION

SYSTEM
A

I
S

DESCRIPTION

The
Air

Injection
System
A
I
S

is

adopted
on
U
S
A

models

except
FU

models

and

injects
compressed
air

secondary
air

coming
from
the
air

pump
into

the
exhaust

port
of
the

cylinder
head
to
reduce

hydrocarbons

He
and

carbon

monoxide
CO
in

exhaust

gas
through
recombustion

There

are
two

types
of
Air

Injection

System

Fresh
outside
air
is
drawn

by
the
air

pump
through
the

air

pump
air

cleaner

Compressed
air
is

injected
into

the

exhaust

manifold

through
the

check
valve

The
A
B

valve

supplies
air
from
the

carburetor
air
cleaner
to
the

intake

manifold

so
as

to

prevent
after

fire

during
deceleration

The
amount

of

injected
air
is
con

trolled

by
C
A

C
valve

California

models
or
air

relief
valve

Non

California
models

Emission
Control

System

r

@
@
CD

L

I

1
Air

pump
drive
hub

5
V
ne

2

Housing
6
Carbon
shoe

3
Rotor

rins
7
Shoe

spri
ng

4

End
cover
8

Stripper

with
needle

bearing
9
Rotor
shaft

Anti
backfire
A
B
valve

This
valve
is
actuated

by
intake

manifold
vacuum
to

prevent
backfire

in
the

exhaust

system
at
the

initial

period
of
deceleration

At

this

period
the
mixture
in
the

intake
manifold

becomes
too
rich
to

ignite
and
burn
in

the
combustion

chamber
and

burns

easily
in

the
ex

haust

system
with

injected
air

in
the

exhaust
manifold

The
A

B
valve

provides
air
to
the

intake
manifold
to

make
the
air

fuel

mixture

leaner
and

prevents
backfire

To
in
take

manifold

vacuum

EC069

Fig
EC

15
A
B
Valve
10
Ball

bearing

11
Front

bearing
cOYer

12

Pulley

13

Pulley

for
air
conditioner

Check
valve

A

check
valve
is

located
in
the

air

pump
discharge
lines
The
valve

pre

vents
the

backflow
of
exhaust

gas

which
occurs
in

the

following
cases

I

When
the
air

pump
drive
belt

fails

2
When

relief
valve

spring
fails

1

11
rom

pump

1

Spring

2
Rubber
valve

3

Seat
SecondarY
air

4
J
Exhaust

gas

EC322

Fig
EC

16
Check
Valve

Air

gallery

The

secondary
air

fed
from
the
air

pump
goes

through
the
check
valve
to

the

air

gallery
in
the

cylinder
head
It

EC
lt
14
Inlet

cavity

15

Outlet
cavity

EC066A

Fig
EC
14
Air

Pump
two
vane

lype

is
then

distributed
to

each
exhaust

port
and

injected
near
the

exhaust

valve

0

iJl

Ai

gallery

2

Exhaust

port

3
Exhaust

manifold

EC316

Fig
EC

17
Air

Gallery

Air
pump
relief
valve

Non
California

models

The
air

pump
relief

valve
controls

the

injection
of

secondary
air
into

the

exhaust

system
when
the

engine
is

running
at

high
speed
under
a

heavily

loaded

condition
It

accomplishes
the

EC149A

Fig
EC

23

Removing
Air
Cleaner

Filter

Air

pump

1
Remove
air

hoses
from

air

pump

2
Remove
air

pump
pulley

3
Loosen
air

pump
adjusting
bar

mounting
bolts
and
air

pump
mount

ing
bolts
then
remove
air

pump
drive

belt

4
Air

pump
assembly
can
be
taken

out
from
bracket

5

Installation
is
in

the
reverse
se

quence
of
removal

Fig
EC
24

Removing
Air

Pump

Check

valve

1
Disconnect
air

hose
from
check

valve

2

Remove
check
valve
from

engine

cylinder
head

3

Installation
is
in

the
reverse
se

fluence
of
removal
Emission

Control

System

EC151A

Fig
EC
25

Removing
Check
Valve

A

B
valve

A
B
valve
is

located
at
the

rear
side

of
air

cleaner
Remove
air

hoses
and

vacuum
tube
A
B
valve
can
then
be

taken
out

EC152A

Fig
EC
26

Removing
A
B
Valve

Air

pump
relief
valve

Non
California
models

I

Loosen

clamp
of
air

hose
and

disconnect
air

hose
from
relief
valve

EC
13
2
Remove
screws

securing
relief

valve
to
air

cleaner
Relief

valve
can

then

be
taken

out
easily

3
Installation
is
in
the
reverse
se

quence
of

removal

EC153A

Fig
EC
27

Removing
Air

Pump

Relief
Valve

C
A
C
valve

California
models

C
A
C

valve
is
located
beneath
con

trol

device
bracket

Remove

clamps
and

disconnect

air

hoses
and
vacuum
tube

2

Remove
screws

securing
C
A

C

valve
Air
control
valve

can
then
be

taken
out

easily

3
Installation
is
in
the

reverse
se

quence
of
removal

EC154A

Fig
EC
28

Removing
C
A
C
Volvo

them

b
If
carbon
shoes
are

exposed
beyond

the
rotor
end
face
remove
carbon

shoes
and
clean
shoe

grooves
Reas

semble
carbon
shoes

6

Vane

1
Pack

vane

bearing
with

high

melting

poinf
grease
MIL
G
3S45
A

Es

o
ANDOK260
or

equivalent
and

insert

dummy
shaft
into
the
vane

bearing

STl9900000

EC563

Fig
EC
40

Va
Assembly

2
Install
vane
in

place
on
rotor

uMng
Dummy
Shaft
STl9900000
as
a

guide

Note
The
woes

may

require
6
to
16

km
4
to
10
miles
wear
in
running

time
In
the
event

a

slight
squeaking

still
remains
drive
the
car

about
64

to
80

km
h
40
to
SO
MPH
In

most

cases
6

to
16
km
4
to
10

miles
will
be
sufficient
for
wear
in

7

Shoe

spring

Place
shoe

springs
in

deeper
groave

of
shoe

11

I

11

1

EC123

Fig
EC
4I
Ins

tolling
Shoe

Spring

Note
When

installing
a

shoe

spring

make
sure
that
the
outward
bend

ing
side
faces
in
shoe
and
that
both

ends
of

sJlri
face
in
the
wall
of
Emission
Control

System

shoe

groove
6e
Sure
to

push
spring

in

SO
that

spring
end
face
is
flush

with
rotor

8
Rotor

ring

Install
rotor

ring
by
correctly

align

ing
the
rear
end
face
of
rotor
with

the

on

mark
in
rotor

ring
and

tighten

screws
with

Hexagon
Wrench

ST
98
10000

l
l
Tightening
torque

Rotor

ring
screw

0
5
to
0

7

kg
m

13

6
to
5
1
ft
lb

Fig
EC

42
Installing
Rotor

Ring

9
Removal
of

dummy
shaft

CarefuDy
withdraw

dummy
shaft

from
vane

10
Vane
shaft

Pack
rear

bearing
with

high

melting

pain
t

grease
MIL
G
3S45
A

Esso
ANDOK
260
or

equivalent

Apply
thin

coating
of

grease
to
vane

shaft
and

rotor
ring
and
insert

vanf

shafi
into
its

bearing

Note

a

Do
not

apply
an
undue
stress
to

vane
shaft
when

inserting

b
If
two
vanes
are
dislocated
when

inserting
vane
shaft

correctly
align

Yanes

by
inserting
dummy
shaft

Then
draw
out

dummy
shaft
and

insert
vane
shaft

c
When
wear
occurs
on

vane
shaft
or

when

replacement
of
rear

bearing
is

necessary
replace
rear
rover
assem

bly

J
I

End
cover

Position
end

cover
in

place
Snugly

tighten
the
bolt
close
to
the
dowel

Then

tighten
end
cover

bolts

EC
t6
l
l
Tighteningtnrque

End
cover
bolts

0
7
to
0
9

kg
m

5
1

to
6
5
ft
bl

EC302

Fig
EC
43
lnstolling
End
Cover

12

Pulley

Tighten

pulley
securing
bolts

Tightening
torque

Pulley
securing
bolts

0
75

to
0
90

kg
m

5
4

to
6
5
ft

Ib

INSPECTION

The
following

procedures
are
re

commended
for

checking
and
or

as

certaining
that
the
various

components

of
the

exhaust
emission
control

system

are

opera
ting
properly

The

engine
and
all

components

mu
t
be
at
normal

operating

tempera

tures
when
the
tests
are

performed

Prior
to

performing
any
extensive

diag

nosis
of
the
exhaust
control

ystem
h

must

be
determined
that
the

engine
as

a
unit
is

functioning
properly

Air

injection
s

stem
hoses

Check
air

system
hoses
for
loose

connections
cracks
or
deterioration

Retighten
01

replace
if

necessary

Air

pump

I

Operate
engine
until
it
reaches

normal

operating
temperature

2

Inspect
all
hose
hose
connec

tions
and
air

gaDery
for
leaks
and

correct
if

necessary
before

checking

air

injection

pump