New Engine Break In And Operation; Engine Lubrication System - Cessna 172R Operating Handbook

CESSNA
MODEL 172R
The EGT
system
exhaust (tailpipe) to supply a voltage
temperature. The EGT indicator responds to the voltage developed
by the thermocouple. As the mixture is leaned (from full rich), the
exhaust gas temperature will
stoichiometric
(most chemically efficient)
and will decrease if the mixture continues to be leaned.
NEW ENGINE BREAK-IN AND OPERATION
The engine underwent a run in
full range of use. It is,
accomplished at 80% power as much as practicable until a total
50 hours has accumulated or oil consumption has stabilized.
will ensure proper seating

ENGINE LUBRICATION SYSTEM

The engine utilizes a full pressure, wet
with aviation grade oil used as the lubricant. The capacity of
system
the sump
engine
quarts. Oil is drawn from the
screen into the
a bypass valve. If the oil is
to
to bypass the oil cooler and go directly from the pump
flow oil filter. If the oil is hot, the bypass valve
the accessory housing
cooler on the
right,
returns to the accessory housing where it passes through the full
flow oil filter. The filter oil then
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.
flow.
An oil filler cap/oil dipstick is located at the right rear of the
engine. The filler
on the top right side of the engine cowling. The engine
on
be operated
eight
quarts (dipstick
specifications, refer to Section 8 of this handbook.
Revision 7
AIRPLANE
uses a thermocouple in the in the
increase
however, suggested that cruising
of the rings.
on
(located
sump
engine-driven oil pump.
cold,
and into a flexible hose leading
rear
engine baffle.
Residual oil is returned to the
cap/ dipstick is accessible through
less than five quarts of oil. For extended flight, fill to
indication only). For
SYSTEMS DESCRIPTION
&
proportional
to a maximum value
fuel-air ratio is achieved
at the factory and
sump-type
the bottom of the engine) is eight
an
through
From the pump, oil is routed
the bypass valve allows the oil
Pressure oil from the
a pressure relief valve which
enters
engine oil grade and
SECTION 7
engine
exhaust gas
to
as the
is ready for
lubrication
oil suction strainer
the
to
routes the oil out of
to the oil
cooler
sump by gravity
an access
door
should
the
be
of
This
full
not
7-21