IO-240 Series Engine Installation & Operation Manual
4-25
31 October 2011
Engine Operation
4-5.1.1.3. Cold Weather Starting Without Preheating
At ambient temperature between 20° to 40º F (-7°to 4° C), perform the following:
CAUTION: Attempting to start an engine with a partially discharged
aircraft battery may result in damage to the starter relay or possible
engine kickback, resulting in a broken starter adapter clutch spring.
1. Use an external power source or ensure the aircraft battery is fully charged.
WARNING
Overpriming can cause a flooded intake resulting in a
“hydraulic lock” event and subsequent engine malfunction or
failure. If you over prime, or flood your engine, ensure excess
fuel has drained from the intake manifold and/or cylinder prior
to attempting engine starting.
2. Use the normal start procedure in Section 4-3.2 and the aircraft AFM/POH. Do not
overprime the engine.
CAUTION: If oil pressure is not indicated within 30 seconds, shut
down the engine and determine the cause. Operating the engine
without oil pressure may result in engine damage.
Do not close the cowl flaps in an attempt to hasten engine warm-up.
3. Operate the engine at 1000 RPM until some oil temperature is indicated.
4. Monitor the oil pressure closely. If necessary, retard the throttle to maintain oil
pressure below 100 psi. If oil pressure is less than 30 psi, or cannot be maintained
below 100 psi, shut the engine down and follow the preheat instructions to prevent
engine damage. Do not close the cowl flaps to facilitate engine warm-up.
5. Check the oil temperature; it should be at least 75° F (24° C).
CAUTION: DO NOT operate the engine at run-up speed unless the
oil temperature is at least 75° F (24° C) and the oil pressure is within
the 30-60 psi range. Operating the engine above idle before reaching
minimum oil temperature may cause a loss of oil pressure and
engine damage.
6. Run the engine up to 1700 RPM; approach this RPM in increments to prevent oil
pressure from exceeding 100 psi.
WARNING
Operating the engine above 1700 RPM before reaching the
minimum oil temperature may result in engine malfunction,
engine failure, injury or death.
CAUTION: Continually monitor oil pressure during run up.
7. When oil temperature has reached 100° F (38° C) and oil pressure does not exceed
60 psi at 2500 RPM, the engine has been warmed sufficiently to accept full rated
power.
Summary of Contents for IO-240-A
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