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lower
engine cowling.
4.11.1
A
lr Filter -
4.11.1.1
Removal -
(a)
Remove
screws
which hold the alr
intake
access
cover
on the lower
cowling.
Remove
cover
.
(b)
Slide filter
out
through access hole.
4.11.1.2
Cleaning and Servicing
-
(a)
Using cleaning
solvent and spray
type
clean-
ing equipment,
flush filter
screen
until thoroughly
cleaned.
(b)
Dry filter fully. Use of
an air
blast will
aid
in removing
excess cleaning
solvent
from the
filter
screen.
(c)
After filter is fully dry,
saturate
in clean
engine
oil. All ow excess oil
to
drain from
the filter
before reinstalling.
4.11.1.3
(a)
(b)
Installation -
Slide
air
cleaner into
position.
Install
access
cover and
retaining
screws.
4.11.2
Air
Scoo
p and
Alternate Air Source -
This
airplane
is not equipped
with
a
conven-
tional carburetor
heater, but uses
the heated
air of
the engine
compartment
as an alternate air
source
for carburetor
heat and for use
in the
event
impact
ice closes the air intake.
4.11.2 .1
Removal
-
(a)
Disconnect alternate air
source control.
(b)
Loosen clamp
attaching
the
flexible duct
to
the
air
intake.
(c)
Remove
drilled
head
bolts
attaching the air
scoop to
the carburetor.
4 .11.2.2
(a)
(b)
safety.
(c)
Installation
-
Align holes in
air scoop and
carburetor.
Install the
drilled
head
attaching
bolts
and
Connect
the
control
and rig as
required.
4.12
EXHAUST
SYSTEM.
The exhaust system
of
the
airplane is greatly
simplified
by the
use
of
a
gasoline cabin
heater in
lieu
of
an exhaust typ
e heater
and
by
us
ing the jet
augmenter with
straight
stacks
from the exhaust
ports
to the augmenter
tube.
4.12.1
Removal of
Exhaust Stacks -
(a)
Loosen clam~
connecting the stacks.
(b)
Remove
the nuts
attaching
the exhaust
stack
to the cylinder.
4.12.2
Removal
of Exhaust Augmenter -
(a)
Remove screws
attaching the augmenter
cover plate
to
the engine nacelle and remove cover
plate.
(b)
Remove
two clamps
attaching
the augmenter
tube
to the nacelle
and
remove the augmenter.
4.12.3
Installation
of
Exhaust Stacks
-
(a)
Install stack and gasket. Tighten nuts
secure-
ly. Torque
on
the exhaust
stack retaining
nuts
should
11e 75 to 100-inch-pounds. Avoid
overtightening
a
s
it
35
deforms the
exhaust
stack
flange
and
causes leaks.
(b)
Install
c
lamps
that hold the
three
stacks
together.
4.12.4
Installation of Exhaust
Augmenter
-
(a)
Slide the
augmenter into position and
install
the
clamps.
(b)
Install the
augmenter cover
plate on
the
engine nacelle.
4.13
ENGINE COOLING SYSTEM -
The
engine is
pressure-coo
led
by
a ir adm itted
at
the front
of
the engine
cowling
and directed with
baffles
around
the
cylinders.
Jet exhaust augmenters
are used to induce
airflow
through the engine
com-
partment and to evacuate the heated air. This device
eliminates the necessity for
controllable cowl
flaps.
As in any
pressure-cooled
engine,
it
ls
imperative
for
proper
cooling that the engine baffles are all
properly
installed and fitted.
4 .13.1
Removal of Engine Baffles -
(a)
Intercylinder
baffles are removed by remov-
ing
the jam
nut
::ind
nut from the
attaching bolt and
removing
the baffle from the Lower
side of the
cylinder.
(b)
The
rear
baffle
is
removed
by
removing the
attaching
screws from the
rear
cylinders
and ac-
cessory case.
It
will
be necessary
to
remove
the
magneto fingers from
the
magneto
and thread
them
through the rear
baffle.
4.13.2
Minor Repair -
Minor repair
of
the engine baffle
may
be
made by the
o
rdinary
methods
used
in any type
of
metal
repair as
long as the
baffle
is
not deformed to
the extent that it will
no
Longer
properly
fit the
cylinder.
4.13.3
Installation
of
Engine Baffles -
(a)
Place the intercylinder baffle
in
position on
the Lower side
of
the cylinder, then place the
small
attaching bracket on the upper side
of
the cylinder
and install the bolts, spring, nut, and jam
nut.
(b)
Place the rear baffle in position
and
attach
with screws at the cylinder heads
and
accessory
case.
Thread the ignition wires through the baffle
and
re-
install in the case.
4.14
IGNITION SYSTEM -
Each engine is equipped with two
Scintilla
magnetos,
one
S6-LN-50 and one S6-LN-51. The
S6-LN-51 is installed
on
the left-hand side and is
equipped with an
impulse
coupling to aid
in
starting.
Champion RC-26S spark plugs with a
.025
gap
are
approved for the
engine.
To eliminate
radio
inter-
ference, the ignition system is completely shielded.
4.14.1
Magneto -
4.14.1.1
Removal -
(a)
Remove six magneto electrodes from
magneto cover by unscrewing knurled retaining ~uts.
(b)
Disconnect
the
switch ground connection at
the magneto.
(c)
Remove the two magneto retaining nuts and
remove the magneto.
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