Piper Cherokee Six - Page 54

*PIPER
CHEROKEE
SIX SERVICE
MANUAL
2-54. OIL
FILTER
(FULL
FLOW).
a.
The oil
filter
element
should
be
replaced
after
each
50
hours
of
engine
operation:
this
is
accomplished
by
removing
the lockwire
from
the
bolt-head
at
the
end of
the
filter
housing.
loosening
the
bolt,
and
removing
the
filter
assembly
from
the
adapter.
b.
Before
discarding
the filter
element,
remove
the
outer
perforated
paper
cover,
and
using
a
sharp
knife.
cut
through
the
folds
of the
element
at both
ends,
close
to the
metal
caps.
Then.
carefully
unfold
the
pleated
element
and
examine
the
material
trapped
in
the filter
for
evidence
of internal
engine
damage
such
as chips
or particles
from
bearings.
In
new or
newly
overhauled
engines,
some
small
particle
of
metallic
shavings
might
be found;
these
are
generally
of
no consequence
and should
not be
confused
with
particles
produced
by
impacting.
abrasion
or
pressure.
Evidence
of
internal
engine
damage
found
in
the oil
filterjustifies
further
examination
to determine
the
cause.
c.
After
the element
has
been
replaced.
tighten
the
attaching
bolt
within
20 to
25
foot-
pounds
of
torque.
Lockwire
the
bolt
through
the
loops
on
the side
of the
housing
to the
drilled
head
of the
thermostatic
valve.
Be
sure
the lockwire
is replaced
at both
the
attaching
bolt
head
and the
thermostatic
oil
cooler
bypass
valve.
2-55.
RECOMMENDATIONS
FOR
CHANGING
OIL.
(Refer
to the
latest
revision
of
Lycoming
Service
Instruction
No.
1014.)
a. In
engines
that
have
been
operating
on
straight
mineral
oil for
several
hundred
hours.
a
change
to ashless
dispersant
oil should
be made
with
a
degree
of caution,
since
the
cleaning
action
of some
ashless
dispersant
oils
will tend
to
loosen
sludge
deposits
and
cause
plugged
oil
passages.
When
an
engine
has
been
operating
on
straight
mineral
oil
and
is
known
to
be in
excessively
dirty
condition,
the
switch
to ashless
dispersant
oil should
be deferred
until
after
the
engine
is overhauled.
b.
When
changing
from
straight
mineral
oil
to ashless
dispersant
oil. the
following
precautionary
steps
should
be
taken:
1.
Do
not add
ashless
dispersant
oil to
straight
mineral
oil.
Drain
the
straight
mineral
oil from
the
engine
and
fill
with ashless
dispersant
oil.
.
Do
not operate
the engine
longer
than
five
hours
before
the
first
oil change.
3. Check
all
oil
screens
for
evidence
of
sludge
or plugging
and
change
oil
every
ten
hours
if sludge
conditions
are evident.
Resume
normal
oil drain
periods
aftersludge
conditions
improve.
2-56.
LUBRICATION
2-57.
LUBRICATION
INSTRUCTIONS.
Proper
lubrication
procedures
are
of
im-
measurable
value
both
as
a means
of prolonging
the service
life
of the
airplane
and
as a
means
of
reducing
the
frequency
of
extensive
and
expensive
repairs.
The
periodic
application
of
recommended
lubricants
to their
relevant
bearing
surfaces.
as
detailed
in
the following
paragraphs.
together
with
the observance
of cleanliness.
will
insure
the
maximum
efficiency
and
utmost
service
of
all
moving
parts.
Lubrication
instruction
regarding
the
locations,
time
intervals.
and type
of
lubricants
used
may
be
found
in
the Lubrication
Chart.
To
insure
the
best
possible
results
from
the
application
of
lubricants,
the
following
precautions
should
be
observed:
a.
Use
recommended
lubricants.
Where
general
purpose
lubricating
oil
is
specified.
but
unavailable,
clean
engine
oil
may
be used
as
a satisfactory
substitute.
b.
Check
the
components
to
be lubricated
for evidence
of excessive
wear
and
replace
them
as
necessary.
Revised:
11/4/83
HANDLING
AND SERVICING
1C6