Aircraft Systems
Engine
The C172S is equipped with a Lycoming, 4-cylinder, IO-360-L2A (Fuel injected, opposed,
360 cubic inch displacement) engine rated at 180 horsepower at 2700 RPM. The engine is
direct drive (crankshaft connected directly to the propeller), horizontally opposed (pistons
oppose each other), piston driven, fuel injected and normally aspirated (no turbo or
supercharging). Engine ignition is provided through the use of engine-driven magnetos, which
are independent of the aircraft's electrical system and each other and utilize impulse coupling.
The induction system has a spring loaded alternate air door inside the cowling (behind the
filter on the left hand side) that will automatically open if the air filter becomes plugged.
"
L Lycoming IO 360"
H Horizontally Opposed 4 cylinder "
A Air Cooled"
N Normally Aspirated"
D Direct Drive
Oil
The Acceptable range for oil in the C172S is 5-8 quarts. "
Never depart with the oil indicating below 5 quarts."
Use only oil approved by the flight school, never use open oil containers and risk
contamination. The engine has a full pressure wet sump type lubrication system. Oil is drawn
from the sump through an oil suction strainer screen into the engine-driven 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 hose leading to
the oil cooler on the right, rear engine baffle. Pressure oil from the cooler returns to the
accessory housing where it passes through the full flow oil filter. The filter oil then enters a
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 the sump by gravity flow. An oil dipstick indicates the level of oil in
the tank. The dipstick is marked for US quarts.
Propeller
The C172S is equipped with a two-bladed, fixed pitch, one piece forged aluminum alloy
propellor which is anodized to retard corrosion. The propellor is 76 inches in diameter.
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