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AIR CLEANER
1
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
Under hood
air inlet
hose
Hot air inlet
hose
Vacuum
hose
Sensor
to
intake
manifold
Vacuum hose
Sensor
to
vacuum
motor
Vacuum
hose
Idle
compensator
to
intake manifold
Hose
Air
pump
to air cleaner
Hose AB
valve to air cleaner
Hose Carburetor
to
air
cleaner
Blow
by
hose
Air
cleaner
to
rocker
cover
Hose
Air
control
vaive
to
air
cleaner California models
only
3
To
install
reverse
the
removal
procedure
INSPECTION
1 AIR CLEANER
ELEMENT
Viscous paper
type
air cleaner
ele
ment
does
not
require
any
cleaning
operation
until
it is
replaced periodi
cally
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 ele
ment
refer
to
Maintenance Sched
ule
2 HOT AIR
CONTROL SYSTEM
In
warm
weather
it is
difficult
to
find
out
malfunction of
hot air control
system
In
cold
wea
thee
however
malfunction of
air
control valve due
to
disconnection
or
deterioration of
vacu
um
hose between intake manifold
and
vacuum
motor and
insufficient
dura
bility
of
air
control valve will
cause
insufficient
automatic
control opera
tion
for intake
air and
result
in
engine
disorder
including
I
Stall
or
hesitation of
engine
oper
ation
2
Increase
in
fuel
consumption
3
uck of
power
Engine
Fuel
These
phenomena
reveal
malfunc
tion of hot air control
system If
these
phenomena
should
occur
check hot
air control
system
as
described
in the
following
before
carrying
out
inspec
tion
of carburetor
2 1
Vacuum
hose
Intake manifold
to
3 way
connec
tor
3 way connector to
temperature
sensor
3 way connector
to
idle
com
pensator temperature
sensor
to
vacu
um
motor
I
Check that
vacuum
hoses
are
se
curely
connected in correct
postion
2
Check each hose
for cracks
or
distortion hose
clip
for
condition
Note
Vacuum hose
position
R H
side
of
Nissan
mark
on
the
top
of
sensor
is
for intake manifold
L U
side of the
mark
is for
vacuum
motor
2 2
Vacuum motor
I
With
engine stopped
disconnect
fresh
air
duct
Place
a
mirror at
the
end of air
cleaner inlet
pipe
as
shown and
check
to
see
if
air
con
trol valve is in correct
position
EF213
Fig
EF
11
Inspecting
valve
position
Air
control valve
is in correct
posi
tion
if
its
under hood
air
inlet
is open
and hot
air
inlet
is
closed
Check
air
control valve
linkage
for
condition
2
Disconnect
vacuum
motor
inlet
vacuum
hose
and
connect
another
hose
to
the inlet
to
apply
vacuum
to
vacuum
motor
Vacuum
can
be
ap
plied by breathing
in the
hose end
as
shown
Place
a
mirror at
the
end of
air
cleaner inlet
pipe
and
check
to
see
if
air
control
valve is in correct
position
EF
6
EF217
Fig
EF 12
Inspecting
valve
position
Correct
position
of
air
control
valve
is
the
reverse
of
p a r a g r a p h J
above Air
control valve is in
correct
position
if
under hood air inlet is
closed
and hot
air
inlet
is
open
3
With
hot
air
inlet
in open
posi
tion
as
described
in
paragraph
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
de
scribed
in
step
2
for
more
than 30
seconds
and that hot
air
inlet
is open
If
diaphragm spring
actuates
the
air
control valve
by
its
spring
force
to
open
under hood
air inlet
within 30
seconds
replace
vacuum
motor
as an
assembly
since
this
may be
resulted
from
air
leak
at
vacuum
motor
dia
phragm
2 3
Temperature
ensor
Check
temperature
sensor
for func
tion
by
proceeding
as
follows Be
sure
to
keep
engine
cold before
starting
test
I
With
engine
off
check
air
control
valve for
condition
In
this
case
under
hood air
inlet
is
open Use
a
mirror
for
inspection
as
2 2 1
above
2
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 2
2 I
under
hood
air
inlet
is
closed
and
hot air
inlet
is
open
3
Check that
air control
valve
grad
ually
opens to
under hood
air
inlet
side
as
engine
warms
up
When
en
vironmental
temperature
around
tern
perature
sensor
is
low
spend
more
time
for
engine warming
up
operation
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