Cessna 172P - Page 142

SECTION
7
AIR,PLANE
&
SYSTEMS
DESCRTPTIONS
oi
this
gage
a,re
presented
in
Section
g,
Supplements.
CESSNA
MODEL
172P
NEW
ENGINE
BREAK-IN
AND
OPERATION
The engine
the
factory
and is ready
for the full
range
of
use. It
that
cruising
be
accomplished
at a
minimum
of 75
of 50
hours hãs
accumulated
or oil
consumption
has stabilized.
This
will
ensure
proper
seating
of
the rings.
ENGINE
OIL SYSTEM
OiI for
engine lubrication is supplied
from a
sump
on
the
bottom of the
engine.
The capacity of
the
engine
sump Ís seven
quarts
(one
additional
quart
is contained in
the full flow
oil
filter).
Oil is drawn from
tho sump
through
an
oil suction
strainer soreen into the engine-drivon
oil
pump.
From
the
pump,
oil
is routed
to a
bypass
valve.
If the
oil is cold, the bypass
valve allows the
oil to bypass
the oil cooler and
go
directly from
the
pump
to the
full flow oil filter.
If the oil is hot,
the bypass valve routes
the oil out
of the accessory
housing and into
a
flexible
horlrq leading
to the oil cooler on
the rÍght, rear
engine baffle. Pressure
oil from the
cooler returns to the
accessory
housing
whero it
passes
through
the
full
flow
oil
filter.
The filter
oÍl then
enters
e
pressure
relief valve
which regulates
engine
oil
pressure
by allowing excessive oil to return to
the sump while
the balance of the oil
is
circulated to
various engine
parts
for lubrication.
Residual oil
is
returned
to tbe sump by
gravity
flow.
An oil filler
oap/oil dipstÍok is located
at
the
right rea,r of the engine.
The
filler cap/dipstiok is aocessible through a,n a,cceaa
door on the top
right side
of
the engine
cowling. The engine
should not be operated
on
less
than
five
qua,rts
of oil. For extended flight,
fill to
seven
quarts
(dipstick
indication
only). For engine oil
grade
and
specifioations, refer to
Section
8
of this handbook.
An oil
quick-drain
valve is available to replace
the drain
plug
on
the
bottorn
of the oil surnp,
and
provides quicker,
cleaner
draining
of
the
engine
oil. To drain the oil with this valve,
slip
a hose over
the end of
the
valve
and
push
upward
on the
end of
the valve
until it
snaps
into
the open
position.
Spring
clips will
hold the valve open.
After draining,
use
a
7-r8
30
May
1980