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CESSNA
MODEL 172N
SECTION 4
NORMAL PROCEDURES
AMPLIFIED PROCEDURES
STARTING ENGINE
c
During engine starting, open the throttle approximately 118 inch. In
warm temperatures, one or two strokes of the primer should be sufficient.
In cold weather, up to six strokes of the primer may be necessary. If the
engine is warm, no priming will be required. In extremely cold tempera-
tures, it may be necessary to continue priming while cranking the engine.
Weak intermittent firing followed by puffs of black smoke from the
exhaust stack indicates overpriming or flooding. Excess fuel can be
cleared from the combustion chambers by the following procedure: set the
mixture control full lean and the throttle full open; then crank the engine
through several revolutions with the starter. Repeat the starting proce-
dure without any additional priming.
If the engine is underprimed (most likely in cold weather with a cold
engine) it will not fire at all, and additional priming will be necessary. As
.---
soon a s the cylinders begin to fire, open the throttle slightly to keep it
running.
After starting, if the oil gage does not begin to show pressure within 30
seconds in the summertime and about twice that long in very cold weather,
stop engine and investigate. Lack of oil pressure can cause serious engine
damage. After starting, avoid the use of carburetor heat unless icing
conditions prevail.
NOTE
Additional details concerning cold weather starting and
operation may be found under COLD WEATHER OPERA-
TION paragraphs in this section.
TAXIING
When taxiing, it is important that speed and use of brakes be held to a
minimum and that all controls be utilized (see Taxiing Diagram, figure 4-
-
A
2) to maintain directional control and balance.
The carburetor heat control knob should be pushed full in during all
ground operations unless heat is absolutely necessary. When the knob is
pulled out to the heat position, air entering the engine i s not filtered.
1
July 1979
4-11
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