Cessna T188C - Page 170

MODEL
188 &
T188
SERIES
SERVICE
MANUAL
11-32.
FULL-FLOW
OIL FILTER.
(1880001
THRU
NOTES
18803473)
(See
figure
11-3.)
When
installing
a new
filter
element,
it is
im-
11-33. DESCRIPTION. An external oil filter may portant that all gaskets are clean, lubricated
be installed
on
the engine.
The filter
and filter
and
positioned
properly,
and correct
amount
adapter
replaces
the
regular
internal
oil
pressure
of torque
is applied
to
filter hollow
stud.
If
screen.
In some
filter
installations,
the
filter
adap-
stud is
under-torqued,
oil leakage
will
occur.
ter incorporates
a bypass
valve,
outlet
valve
and
If stud
is over-torqued,
the
filter
can may
be
isolation
valve.
Normally,
oil
from
the oil
pump
deformed,
again
causing
oil
leakage.
flows
through the isolation
valve,
through the filter
element,
through
the outlet
valve,
to the
engine
oil
passages.
If the filter element
should become
block-
ed, the bypass
valve
and outlet
valve will
open,
allow-
*Lubricate
rubber
grommets
in each
end of
ing pressure
oil to flow
to the
engine
oil passages.
new
filter
element,
rubber
gaskets
(13,
17)
The
isolation
valve
blocks
off the
filter
assembly
and
and metal
gasket
(22)
with a
thin coating
of
oil then
flows
through
the
bypass
valve,
if excessive
Dow Corning
Compound,
DC-4,
apply
by
oil pressure
should
occur.
In some
filter installa-
brushing
or wiping
lubricant
on base
gasket.
tions the
filter adapter
incorporates
only a bypass
valve.
Before
assembly,
place
a straightedge
across
bottom of filter can. Check for a distortion
11-34.
ELEMENT
REMOVAL
AND
INSTALLATION.
or
out-of-flat
condition
greater
than .010
inch.
(See
figure
11-3.)
Replace
if either
of these
conditions
exist.
NOTE
* Before
assembly,
cut adapter
nut safety wire
and
try to rotate
adapter by
hand. If adapter
New filter kits
are available
from the Cessna
can be moved,
check for thread
deformation
Supply
Division.
in engine and
adapter.
a.
Remove
engine
cowling
in accordance
with
para-
· After
installing
a new
gasket
on
lid (16),
graph
11-3.
turn it upside
down.
If gasket
falls,
try
b.
Remove
safety wires
from
filter can
and unscrew
a different
gasket
and repeat
test.
If
hollow
stud
(23)
to detach
filter
assembly
from
adapter
this
gasket
falls
off, install
a
new lid.
(5)
as a
unit.
Remove
filter
assembly
from
aircraft,
discarding
upper
gasket (13).
Oil
will drain
from
g. Inspect
adapter
gasket
seat
for gouges,
deep
filter as assembly
is
removed
from adapter.
scratches,
wrench marks
and mutilation.
If any of
c.
Press downward
on stud (23)
to remove from
these
conditions are
found, install
a new adapter.
filter
element
(18) and can
(19).
Discard metal
h.
Place new
element in
can and
insert stud
(23)
gasket (22) on stud
(23).
with a new metal
gasket (22) in place, through
the
d. Lift lid (16)
from can (19) and discard
lower
can and element.
gasket (17).
i.
Position a new
gasket (17) inside
lower flange
of
e. Pull filter
element (18)
from can (19) and
dis-
lid (16). Position
new gasket (13)
around upper
flange
card.
of lid (16).
Place the
lid in position.
j. Install filter
assembly on
adapter. Holding
can
NOTE
to prevent
it from
turning, tighten
stud (23)
and torque
to 20-25 lb-ft
(240-300 lb-in),
using a torque
wrench.
Before discarding
removed
filter element,
re-
k. Reinstall parts
removed for
access and
service
move the
outer perforated
paper cover;
using
the engine with
proper grade
and quantity of
oil. One
a sharp
knife, cut through
the folds
of the fil-
additional
quart of oil is
required each
time the ele-
ter element
at both
ends,
close to the
metal
ment
is replaced.
caps. Then
carefully unfold
the pleated
ele-
1. Start engine
and check for
proper oil pressure.
ment and examine the material
trapped in the
Check for oil leakage after
warming up engine.
filter element
for
evidence
of internal
engine
m.
Again check
for oil
leakage
after engine
has been
damage such as
chips or particles
from bear-
run
at a high power
setting (preferably
a flight around
ings.
In new or
newly overhauled
engines,
the field).
some small particles or metallic shavings n. Check to make sure that the filter has not been
might be found. These
are generally of no
in contact with adjacent parts
due to engine torque.
consequence
and
should not
be confused
with
o. While
engine
is still warm,
recheck
torque
on
particles produced
by impacting,
abrasion
stud (23), then
safety stud to lower
tab (21) on
filter
or pressure.
Evidence
of
internal engine
can and safety
adapter
to upper
tab (20)
on filter can.
damage found
in the oil
filter element
justifies
further
examination to
determine the
cause.
11-35. ADAPTER
REMOVAL.
(See figure
11-3.)
a. Remove filter assembly as outlined in paragraph
f.
Wash lid
(16), hollow
stud
(23) and
can (19)
in
11-34.
cleaning
solvent
and dry
with
compressed
air.
b.
Note
angular
position
of adapter,
then
remove
safety
wire
and
loosen
adapter
nut
(2).
11-14
Revision
I