Cold Weather Starting; Ground Running And Warm-Up - Lycoming O-290 Operator's Manual

SECTION 3
OPERATING INSTRUCTIONS
e. Set propeller governor (if applicable) in "Full RPM" position.
f. Turn fuel valve to "on" position.
g. Set throttle at ¼ travel.
h. Move mixture control to "Full Rich"
i. Turn boost pump on.
j. Pump throttle to full open and back to idle position for 2 to 3 strokes for a cold engine. If engine is
equipped with a priming system, cold engine may be primed with 1 to 3 strokes of the priming pump.
k. Set magneto selector switch. Consult airframe manufacturer's handbook for correct position.
l. Engage starter.
m. When engine fires, place magneto switch in "Both " position.
n. Check oil pressure gage. If oil pressure is not indicated within thirty seconds, stop engine and
determine trouble.
4. COLD WEATHER STARTING. During extreme cold weather, it may be necessary to preheat the engine
and oil before starting.
5. GROUND RUNNING AND WARM-UP. Subject engines are air pressure cooled and depend on the
forward movement of the aircraft to maintain proper cooling. Particular care is necessary, therefore, when
operating these engines on the ground. To prevent overheating, it is recommended that the following
procedures be observed.
Any ground check that requires full throttle operation must be limited to three minutes, or
less if the indicated cylinder head temperature exceeds the maximum as stated in this
manual.
a. Head the aircraft into the wind.
b. If a controllable pitch propeller is installed, operate the engine on the ground only with the propeller in
minimum blade angle setting.
c. Leave the mixture control in "Full Rich".
d. Avoid prolonged idling at low RPM as this practice may result in fouled plugs. Limit ground running
to minimum time necessary to warm engine for take-off.
e. Use of the carburetor air heat on the ground must be held to an absolute minimum. On some
installations the air does not pass through the air filter and dirt and foreign substances can be taken
into the engine with the resultant cylinder and piston ring wear. Carburetor air heat should be used on
the ground only to make certain it is functioning properly.
3-2
LYCOMING OPERATOR'S MANUAL
NOTE
O-235 AND O-290 SERIES