Technify Motors Cessna 172, Руководство по обслуживанию

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Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
Rev. No:
Rev. Date:
Chapter:
Issue:
Issue Date:
Page:
Content: 20-AMM-71-02
3
06.11.2013
3
46
1
25.08.2014
Induction and Fuel System
A common rail system with electrically actuated injectors is used.
The high-pressure fuel pump is driven by the intake cam and is a
three piston radial pump. The injection pump is set to a more
advanced timing for a cooler exhaust temperature, to ensure a
exhaust temperature below 900 °C (during maximum continuous
power), the pre-injection is retained. The gas exchange of the
engine is realized by the intake system, the exhaust system and
the turbocharger. The system is controlled by the FADEC. No
intake air restriction is necessary due to the qualitative mixture
formation. The fresh air passes the dry air filter to the
turbocharger, where it is compressed, and flows directly through
the intercooler to the intake manifold. Manifold air pressure and
temperature are measured and forwarded to the FADEC, which
is calculating a signal for the duty cycle valve.
Oil System
The oil system is a wet oil sump system, consisting of the
following components:
•
the sump
•
the oil pump driven by chain
•
the thermostat
•
the oil cooler (TAE 125-02-99)
•
oil / water heat exchanger (TAE 125-02-114)
•
the oil pressure sensor
•
the oil filter
•
the blow-by system
•
the oil pump driven by the gearbox
•
the oil temperature sensor
The oil system is used for lubrication, cooling and the micro
sealing of the engine in the area of the piston and cylinder. The
pressure cycle lubricates all heavily used bearings of the engine
and supplies the turbocharger with oil. Cams, chain drive and
valve guides are lubricated with pressure less leak oil. The oil is
sucked by the chain driven pump from the sump and led to the
filter, thereafter to the thermostat. At oil temperatures lower than
78°C oil is streaming directly to the main path through the short
cycle. When the oil temperature rises above 78°C, the thermostat
opens the path to the oil cooler. At temperatures above 94°C the
oil is taking path through the oil cooler exclusively, which ensures
a maximum oil temperature of 140°C under all operating
conditions.