CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 4-11
AMPLIFIED PROCEDURES
STARTING ENGINE (Temperatures Above Freezing)
During engine starting, open the throttle approximately 1/2 inch. In warm weather, one stroke of the
primer should be sufficient. In temperatures near freezing, up to 3 strokes of the primer may be
necessary. As the engine starts, slowly adjust the throttle as required for 1000 RPM or less.
NOTE
The carburetor used on this airplane does not have an accelerator pump;
therefore, pumping of the throttle must be avoided during starting
because doing so will only cause excessive leaning.
Weak intermittent firing followed by puffs of black smoke from the exhaust stack indicates over priming
or flooding. Excess fuel can be cleared from the combustion chambers by the following procedure: set
the mixture control in the idle cut-off position, the throttle full open, and crank the engine through
several revolutions with the starter. Repeat the starting procedure without any additional priming.
If the engine is under primed (most likely in cold weather with a cold engine) it will not fire at all, and
additional priming will be necessary.
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 the 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
Details concerning cold weather starting and operation at temperatures
below freezing may be found under Cold Weather Operation paragraphs
in this section.
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