C42 SERIES Pilot Operating Handbook
POH Issue 4 Rev. 5 Page 22 of 91
If the engine has been flooded, close main fuel valve, open the throttle to a
half and start the engine. When the engine starts, quickly reduce the throttle
to idle.
A four-stroke engine requires a fairly long warm up period. Run the engine
at 2000 1/min for at least 2 minutes then increase to 2500 1/min - 3000 1/min
until the oil temperature is at least 122°F (50°C).
The cylinder heads of the ROTAX 912UL engine are liquid-cooled whereas
the cylinder barrels are air-cooled.
In the case of the C42 / C42 UK, there are separate cooling systems for the
coolant and the oil.
In the case of the C42B / C42B UK / C42E / C42C / C42CS, only the coolant
is cooled by a cooler. The coolant and oil systems are connected to one heat
exchanger, thus the temperatures of both fluids adapt to each other. The
temperatures of the coolant, oil and cylinder head of the C42B / C42B UK /
C42E / C42C /C42CS are, therefore, almost identical. Due to heat exchange
the oil also warms up faster during the run-up phase. It is, however, still
necessary to mask the water cooler if optimum engine temperature (>90°C)
is to be achieved during cold weather operation (max. one-third of the
surface may be covered with tape or self-adhesive neoprene).
Perform the MAG check at 4000 1/min. Rpm drop should not exceed
300 1/min with a maximum difference between MAGs of 115 1/min.
In case your aircraft is equipped with a cowl flap,
please refer to the instructions in the paragraph 4.9 :
Using the optional cowl flap on the aircraft C42
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