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attaches to the diaphragm and a spring above the diaphragm pushes the needle-valve downwards.
Fuel pressure from the fuel injector pushes the diaphragm up against the spring and opens a port
in the needle-valve. The port connects to the outlet pipes for the cylinders. When fuel flows out the
pressure drops and the needle-valve closes a small amount to keep up the injector pressure. At
idle the needle-valve can close between each pulse of fuel. At the usual power settings the needlevalve
stays open to keep up the fuel pressure.
AIRCRAFT
Engine Fuel and Control DA 40 Series
AMM
Page 4
20 Sep 2007 73-00-00 Doc # 6.02.01
Rev. 5
C. Injector Nozzles
Rigid pipes from the fuel-flow-divider connect to a nozzle in each cylinder inlet port. The nozzle has
a jet. Fuel from the jet flows out under pressure into an air-bleed chamber. The air and the fuel mix
in the air-bleed chamber and then goes into the inlet port.
Each nozzle is calibrated ± 2%. Nozzles of the same part number are interchangeable between
cylinders and they are interchangeable between engines.
D. Fuel Flow Indicator
The fuel flow indicator is part of the engine integrated display unit. The display unit is mounted in
the instrument panel, right side. A transducer in the engine fuel system senses the fuel flow and
the value is displayed in display unit.
E. Fuel Pressure Indicators
The fuel pressure indicator is part of the engine integrated display unit. A transducer in the engine
fuel system senses the fuel pressure and the value is displayed in the display unit. Another
transducer in the system operates a warning light in the central warning panel when the fuel
pressure drops below the minimum permissible pressure.
F. Manifold Pressure Indicator
The manifold pressure indicator is part of the engine integrated display unit. A transducer attached
to the manifold pressure hose senses the manifold pressure and the value is displayed in the
display unit.
G. Air Intake
The air intake is part of the engine bottom-cowling. It is in the center of the bottom cowling and air
flows from atmosphere directly into the air filter assembly.
H. Air Filter Assembly
The air filter is of the corrugated paper type and is located on the front of the alternate air assembly.
You cannot clean the air filter. If the air filter becomes dirty or damaged you must replace it.
AIRCRAFT
DA 40 Series
AMM
Engine Fuel and Control
Doc # 6.02.01
Rev. 5 73-00-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the engine fuel and control system. It only gives
you the data for the air intake and filter assembly. For more data on trouble-shooting the engine fuel
and control system refer to the Lycoming Maintenance Manual. If you have the trouble detailed in the
Trouble column read across to the Possible Cause column. Then do the repair given in the Repair
column.
Trouble Possible Cause Repair
Loss of engine power. Blocked air intake.
Dirty/Damaged air filter.
Examine the air intake.
Remove any obstructions.
Replace the air filter.
AIRCRAFT
Engine Fuel and Control DA 40 Series
AMM
Page 102
20 Sep 2007 73-00-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Engine Fuel and Control
Doc # 6.02.01
Rev. 5 73-00-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This section tells you how to remove/Install the air filter and how to remove/install the fuel injector. For
more data on the engine fuel and control system refer to the Lycoming Maintenance Manual.
2. Remove/Install the Engine Air Filter
A. Remove the Engine Air Filter
Detail Steps/Work Items Key Items/References
WARNING: DO NOT STAND WITHIN THE DANGER AREA OF THE PROPELLER
IF THE ENGINE STARTS, THE PROPELLER CAN CAUSE DEATH OR
INJURY TO PERSONS.
WARNING: YOU MUST MAKE SURE THAT THE ENGINE IS SAFE BEFORE YOU
DO WORK ON THE ENGINE. IF THE PROPELLER TURNS IT CAN
CAUSE INJURY TO PERSONS.
(1) Make sure that the engine is safe:
S Set the ignition switch to OFF.
S Set the throttle control to IDLE.
S Set the mixture control lever to LEAN CUTOFF.
(2) Remove the engine cowlings. Refer to Section 71-10.
(3) Disconnect the airplane battery. Refer to Section 24-31.
(4) Disconnect the spark plug cables from the spark
plugs.
(5) Loosen the worm drive clamp that holds the air
filter to air filter housing.
(6) Pull the air filter forward and clear of the air filter
housing.
AIRCRAFT
Engine Fuel and Control DA 40 Series
　
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