Exhaust System; Carburetor And Priming System; Cooling System - Cessna 1980 182Q Pilot's Operating Handbook And Flight Manual

SECTION 7
AIRPLANE
&
SYSTEMS DESCRIPTIONS
CESSNA
MODEL 182Q
the lower front portion of the engine cowling. The intake is covered by an
air filter which removes dust and other foreign matter from the induction
air. Airflow passing through the filter enters an airbox. After passing
through the airbox, induction air enters the inlet in the carburetor which is
under the engine, and is then ducted to the engine cylinders through intake
manifold tubes. In the event carburetor ice is encountered or the intake
filter becomes blocked, alternate heated air can be obtained from a shroud
around an exhaust riser through a duct to a valve, in the airbox, operated
by the carburetor heat control on the instrument panel. Heated air from the
exhaust riser shroud is obtained from unfiltered air inside the cowling. Use
of full carburetor heat at full throttle will result in a loss of approximately
one to two inches of manifold pressure.
EXHAUST SYSTEM
Exhaust gas from each cylinder passes through riser assemblies to a
muffler and tail pipe. The muffler is constructed with a shroud around the
outside which forms a heating chamber for cabin heater air.
CARBURETOR AND PRIMING SYSTEM
The engine is equipped with an up-draft. float-type. fixedjetcarburetor
mounted on the bottom of the engine. The carburetor is equipped with an
enclosed accelerator pump. an idle cut-off mechanism. and a manual
mixture control. Fuel is delivered to the carburetor by gravity flow from
the fuel system. In the carburetor, fuel is atomized. proportionally mixed
with intake air, and delivered to the cylinders through intake manifold
tubes. The proportion of atomized fuel to air may be controlled, within
limits, by the mixture control on the instrument panel.
To facilitate starting in cold weather, the engine is equipped with a
manual primer. The primer is actually a small pump which draws fuel
from the fuel strainer when the plunger is pulled out. and injects it into the
intake manifold when the plunger is pushed back in. The plunger is
equipped with a lock and, after being pushed full in, must be rotated either
left or right until the knob cannot be pulled out. A six-port primer is
available WhICh injects the fuel into individual cylinder intake ports in
lieu of the mtake manifold. Both primers are identical in appearance,
except for the plumbing, and operate in the same manner.
COOLING SYSTEM
Ram air for engine cooling enters through two intake openings in the
front of the engine cowling. The cooling air is directed around the cylinders
and other areas of the engine by baffling, and is then exhausted through
cowl flaps on the lower aft edge of the cowling. The cowl flaps are
mechanically operated from the cabin by means of a cowl flap lever on the
7-20 1 October 1979