Cessna 172P Pilot's Operating Handbook And Flight Manual 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